CN109428624B - Signal processing method, network device, terminal, and computer-readable storage medium - Google Patents

Signal processing method, network device, terminal, and computer-readable storage medium Download PDF

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CN109428624B
CN109428624B CN201710759054.XA CN201710759054A CN109428624B CN 109428624 B CN109428624 B CN 109428624B CN 201710759054 A CN201710759054 A CN 201710759054A CN 109428624 B CN109428624 B CN 109428624B
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CN109428624A (en
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秦飞
刘昊
孙鹏
吴凯
姜大洁
冯三军
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Vivo Mobile Communication Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

The invention discloses a signal processing method, network equipment, a terminal and a computer readable storage medium, wherein the method comprises the following steps: acquiring a digital sending signal sent by a sending link and a digital receiving signal received by a receiving link; constructing a nonlinear interference signal of a transmitting link to a receiving link according to the digital transmitting signal and the digital receiving signal; and filtering out nonlinear interference signals in a receiving link. The receiving and transmitting node estimates the nonlinear interference signal which is transmitted by the transmitting link and received and caused by the receiving link according to the digital transmitting signal transmitted by the transmitting link and the digital receiving signal received by the receiving link, and further deletes the nonlinear interference signal in the receiving link, so that the multi-frequency working performance of the receiving and transmitting node is improved, and the system spectrum efficiency is improved.

Description

Signal processing method, network device, terminal, and computer-readable storage medium
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a signal processing method, a network device, a terminal, and a computer-readable storage medium.
Background
The field of mobile communication has progressed from the first to the fifth generations, and multiband transmission has become a common phenomenon, from the fourth generation (4)thGeneration, 4G) mobile communication system started, and Carrier Aggregation (CA) or Dual Connectivity (DC) technology supporting simultaneous operation of multiple bands was introduced, and fifth Generation (5)thGeneration, 5G) mobile communication system initially established a Non-Stand Alone (NSA) system based on 4G and 5G air interface joint networking.When a wireless mobile communication device (base station or terminal) has multiple frequency bands to transmit and receive simultaneously, a nonlinear device on a radio frequency link may generate harmonic and intermodulation interference to a receiver, and the interference to a received signal generated when the transmitter transmits a signal is collectively referred to as nonlinear self-interference.
Specifically, as shown in fig. 1, a schematic diagram of a transceiver structure of a wireless mobile communication device is shown, where in a transmission link, a baseband signal sent by a baseband signal processor is sequentially subjected to digital-to-analog conversion, up-conversion, power amplification and filtering, and then sent out via a duplex antenna; in a receiving link, a duplex antenna receives a radio frequency signal, and generates a baseband signal to be processed after sequentially performing filtering, low-noise amplification, down-conversion and analog-to-digital conversion, and then the baseband signal is processed by a baseband signal processor to analyze a useful signal. Among them, analog devices such as Power Amplifier (PA) and Low Noise Amplifier (LNA) generate nonlinear signals, which are as follows:
y＝α1x+αx2+α3x3+…αixi
where x is the input signal, y is the nonlinear signal of the output, αiIntensity coefficient, x, of each nonlinear signal due to device characteristicsiHigh order components of the non-linear signal. Let x be Acos ω t,
Figure GDA0002790615190000011
Figure GDA0002790615190000021
wherein, i ω t is a higher harmonic interference signal.
For the intermodulation signals, when signals of 2 frequencies are input, for example, x ═ x1+x2＝A1cosω1t+A2cosω2t, intermodulation interference signals are as follows:
y＝α1(x1+x2)+α(x1+x2)2+α3(x1+x2)3+…αi(x1+x2)i
wherein, x is1+x2＝A1cosω1t+A2cosω2t is substituted into the above formula, so as to obtain the intermodulation signals of each order.
Further, when at least two carrier frequencies F1 and F2 satisfy a certain relationship, such as F1 at 1.7-1.8 GHz and F2 at 3.4-3.6 GHz, the following potential interferences exist: second harmonic interference, 2 nd harmonic generated by the nonlinearity of the F1 power amplifier will leak into the receiving link of F2 through the transmission line and/or the PCB, generating 2 nd harmonic interference; intermodulation interference, two different frequency transmit signals F1 and F2 will produce second order intermodulation interference at the F1 receiver.
In order to solve the above nonlinear signal interference, the following methods are often adopted in the prior art: the first method is radio frequency interference isolation, namely, adding a filter, increasing PCB wiring isolation, adopting microwave transmission lines and other methods, so that interference signals generated by a transmitting link enter a receiving link as little as possible, but the requirement on the filtering capability of the filter is high, extra insertion loss is brought, the cost is high, and the interference suppression capability is poor. And secondly, radio frequency interference cancellation, namely, the interference signal generated by the transmitting link is subjected to specific phase amplitude adjustment to generate a radio frequency analog signal with equivalent amplitude and opposite phase, and the interference signal is cancelled, but the interference signal and the useful signal are mixed together and difficult to extract, and the generated cancellation signal has high complexity and poor interference suppression capability. And a third mode is to avoid the simultaneous working of the transmitting link and the receiving link, namely, the transmitting link and the receiving link are subjected to time division multiplexing through the coordinated scheduling of the network equipment, or 2 transmitting links generating intermodulation interference do not work simultaneously, but the mode not only reduces the overall transmission speed of signals, but also is not beneficial to the full utilization of system resources.
Disclosure of Invention
The embodiment of the invention provides a signal processing method, network equipment, a terminal and a computer readable storage medium, which aim to solve the problem that the prior art cannot solve the self-interference of a nonlinear signal.
In a first aspect, an embodiment of the present invention provides a signal processing method, which is applied to a transceiver node, where the transceiver node includes: the working frequency points of the transmitting link and the receiving link are different; the signal processing method comprises the following steps:
acquiring a digital sending signal sent by a sending link and a digital receiving signal received by a receiving link;
constructing a nonlinear interference signal of a transmitting link to a receiving link according to the digital transmitting signal and the digital receiving signal;
and filtering out nonlinear interference signals in a receiving link.
In a second aspect, an embodiment of the present invention further provides a transceiver node, where the transceiver node includes: the working frequency points of the transmitting link and the receiving link are different; the transceiving node further comprises:
the acquisition module is used for acquiring a digital sending signal sent by the sending link and a digital receiving signal received by the receiving link;
the building module is used for building a nonlinear interference signal of the transmitting link to the receiving link according to the digital transmitting signal and the digital receiving signal;
and the filtering module is used for filtering the nonlinear interference signals in the receiving link.
In a third aspect, an embodiment of the present invention provides a network device, which includes a processor, a memory, and a computer program stored in the memory and running on the processor, and when the processor executes the computer program, the steps of the signal processing method described above are implemented.
In a fourth aspect, an embodiment of the present invention provides a terminal, including a processor, a memory, and a computer program stored in the memory and being executable on the processor, where the computer program, when executed by the processor, implements the steps of the signal processing method described above.
In a fifth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the signal processing method described above.
Thus, according to the digital transmission signal transmitted in the own transmission link and the digital reception signal received in the reception link, the signal processing method, the network device, the terminal, and the computer-readable storage medium of the embodiments of the present invention estimate the non-linear interference signal, which is transmitted by the transmission link and received and caused by the interference in the reception link, and further delete the non-linear interference signal in the reception link, so as to improve the multi-frequency operating performance of the transceiving node and improve the system spectrum efficiency.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of a transceiver structure of a wireless mobile communication device;
FIG. 2 is a flow chart of a signal processing method according to an embodiment of the present invention;
fig. 3 is a block diagram of a transceiver node according to an embodiment of the present invention;
FIG. 4 shows a block diagram of a network device of an embodiment of the invention;
FIG. 5 shows a block diagram of a terminal of an embodiment of the invention;
fig. 6 is a block diagram illustrating a structure of a transceiving node for filtering out second harmonic interference according to an embodiment of the present invention;
fig. 7 is a block diagram of a structure of a transceiver node for filtering intermodulation interference according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The signal processing method of the embodiment of the invention is applied to a transceiving node, wherein the transceiving node comprises at least one transmitting link and at least one receiving link, and the transmitting link and the receiving link have different working frequency points. Specifically, as shown in fig. 2, the signal processing method includes the steps of:
step 21: and acquiring a digital sending signal sent by the sending link and a digital receiving signal received by the receiving link.
Because the transmitting link and the receiving link belong to the same transceiving node, and the digital transmitting signal transmitted by the transmitting link and the digital receiving signal received by the receiving link belong to completely known signals for the transceiving node, the transceiving node can acquire the digital transmitting signal transmitted by the transmitting link and the digital receiving signal received by the receiving link.
Step 22: and constructing a nonlinear interference signal of the transmitting link to the receiving link according to the digital transmitting signal and the digital receiving signal.
According to the known digital sending signal and the known digital receiving signal, a nonlinear interference signal of the sending link to the receiving link of the transceiving node can be constructed.
Step 23: and filtering out nonlinear interference signals in a receiving link.
Because the nonlinear interference signal generated by the transmitting link is constructed in step 22, in order to avoid that the part of the nonlinear interference signal enters the receiving link to cause adverse effect on self-reception, the part of the nonlinear interference signal is filtered after the receiving link receives the digital receiving signal, so as to improve the multi-frequency working performance of the transceiving node.
Specifically, after step 21, the method further comprises: acquiring a useful signal and a self-interference signal in a digital receiving signal; if the signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal in the digital receiving signal is greater than or equal to the first threshold, the step of constructing and filtering the non-linear interference signal is not performed, that is, the self-interference signal is ignored, and the step 22 and the step 23 are not performed. Specifically, if the ratio of the signal strength of the useful signal to the signal strength of the self-interference signal in the digital received signal is greater than or equal to the first threshold, the self-interference signal is ignored. That is, when the wanted signal is much stronger than the signal strength of the self-interference, the self-interference signal has little influence on the reception performance of the wanted signal, and the self-interference signal can be ignored.
Specifically, when the transmitting link does not send signals, useful signals in digital receiving signals received by the receiving link are obtained; when the receiving link only receives the transmitted signal of the transmitting link, the self-interference signal in the digital receiving signal received by the receiving link is obtained. Specifically, the Strength of the useful Signal s (t) may be obtained by measuring Reference Signal Receiving Power (RSRP) when the transmission link does not transmit a Signal, and the Strength of the self-interference Signal i (t) of the terminal may be obtained by measuring in an idle time slot where the cell and the neighboring cell do not transmit a downlink Signal, specifically, may be obtained by measuring in a time slot where a Received Signal Strength Indicator (RSSI) is selected to be close to N0.
Step 22 may be specifically implemented in the following manner: estimating the channel response of a self-interference signal generated by a transmitting link in a receiving link according to the digital transmitting signal and the digital receiving signal; and constructing a nonlinear interference signal of the transmitting link to the receiving link according to the channel response. Although the actual self-interference signal generated by the transmitting link is unknown, according to the known digital transmitting signal and the digital receiving signal, the channel response of the self-interference signal in the receiving link can be estimated, according to the channel response, an equivalent non-linear interference signal can be constructed, the equivalent non-linear interference signal is regarded as the self-interference signal generated by the transmitting link, and the self-interference signal is filtered in the received digital receiving signal, so as to avoid the adverse effect of the self-interference signal on the self-receiving link.
Wherein, according to the digital sending signal and the digital receiving signal, the step of estimating the channel response of the self-interference signal generated by the transmitting link in the receiving link specifically comprises: estimating the frequency domain channel response of a self-interference signal generated by a transmitting link in a receiving link according to the digital transmitting signal and the digital receiving signal; and/or estimating the time domain channel response of the self-interference signal generated by the transmitting chain in the receiving chain according to the digital transmitting signal and the digital receiving signal. That is, the frequency domain channel response and the time domain channel response of the self-interference signal in the receive chain can be estimated from the fully known digital transmit signal and the digital receive signal, but the estimation algorithms for estimating the frequency domain channel response and the time domain channel response are different.
In the following, this embodiment takes an estimation algorithm of frequency domain channel response in different scenarios as an example.
In the first scenario, channel response estimation is performed when a receiving link does not obtain a scheduled idle time slot.
Specifically, when the self-interference signal generated by the transmitting link is a second harmonic signal, and when the receiving link only receives the signal sent by the transmitting link, the frequency domain channel response of the self-interference signal is estimated by dividing the frequency domain transform of the digital receiving signal by the frequency domain transform of the nonlinear component of the digital sending signal; the specific formula is as follows:
Figure GDA0002790615190000061
wherein the content of the first and second substances,
Figure GDA0002790615190000062
represents the frequency domain transformation of the nonlinear component of the digital transmit signal in the receive chain in response to a function, Y (ω) represents the frequency domain transformation of the digital receive signal, and HNL (ω) represents the frequency domain transformation of the nonlinear component of the digital transmit signal.
In this scenario, the channel response estimate is more accurate without interference from the desired signal (or called the desired received signal).
And in the second scenario, channel response estimation is carried out when a receiving link is scheduled and an expected receiving signal exists.
Specifically, if the ratio of the signal strength of the useful signal to the signal strength of the self-interference signal in the digital received signal is greater than or equal to the first threshold, the self-interference signal is ignored. That is, when the wanted signal is much stronger than the signal strength of the self-interference, the self-interference signal has little influence on the reception performance of the wanted signal, and the self-interference signal can be ignored.
When the transmitting link does not transmit signals, useful signals in digital receiving signals received by the receiving link are obtained; when the receiving link only receives the transmitted signal of the transmitting link, the self-interference signal in the digital receiving signal received by the receiving link is obtained. Specifically, the Strength of the useful Signal s (t) may be obtained by measuring Reference Signal Receiving Power (RSRP) when the transmission link does not transmit a Signal, and the Strength of the self-interference Signal i (t) of the terminal may be obtained by measuring in an idle time slot where the cell and the neighboring cell do not transmit a downlink Signal, specifically, may be obtained by measuring in a time slot where a Received Signal Strength Indicator (RSSI) is selected to be close to N0.
Further, if the signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is smaller than the second threshold, the method is based on
Figure GDA0002790615190000071
Estimating self-interferenceThe frequency domain channel response of the signal. In this scenario, the useful signal is much smaller than the self-interference signal, and the channel estimation of the interference signal is relatively accurate, and the channel estimation can be performed in the scenario one manner.
Wherein the content of the first and second substances,
Figure GDA0002790615190000072
represents the frequency domain transformation of the nonlinear component of the digital transmit signal in the receive chain in response to a function, Y (ω) represents the frequency domain transformation of the digital receive signal, and HNL (ω) represents the frequency domain transformation of the nonlinear component of the digital transmit signal.
Or, if the signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is greater than or equal to the second threshold and less than the first threshold, the method is based on
Figure GDA0002790615190000073
Figure GDA0002790615190000074
And jointly estimating the channel response of the self-interference signal through N subcarriers.
Wherein the content of the first and second substances,
Figure GDA0002790615190000081
frequency domain transformation, Y (omega), representing the response function of the non-linear component of the digital transmission signal on sub-carriers 1 to N in the receiving chainn) Representing the frequency domain transform, HNL (omega), of said digital received signal on a subcarrier nn) Representing a frequency domain transformation of a non-linear component of said digital transmission signal on subcarrier n. In this scenario, the signal strength of the useful signal and the self-interference signal and the channel estimation of the interference signal have a large error, and in order to improve the accuracy of the channel estimation, the channel estimation may be performed in a multi-subcarrier joint manner.
Wherein, Y (omega) isn)＝βH(ωn)HNL(ωn)+N0Substituted into the above
Figure GDA0002790615190000082
Figure GDA0002790615190000083
Since the noise is small and can be ignored generally, although the signal strength of the useful signal is equivalent to that of the self-interference signal, the influence of the useful signal on the channel estimation can be greatly reduced since the useful signal is shared by the N subcarriers. Therefore, the signal response estimated according to the formula is close to the actual transmission performance of the transmitting link, and the actual transmission channel of the receiving link can be accurately estimated.
It should be noted that the value of N is proportional to the ratio of the signal strength, that is, when the useful signal is similar to the self-interference signal, the larger the ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is, the larger the interference of the useful signal to the channel estimation is, at this time, N needs to be increased to reduce the interference, so as to obtain more accurate channel estimation.
It should be noted that the nonlinear component in the digital transmission signal may be a second harmonic or other higher harmonic signal, or may be a multi-frequency intermodulation signal. The following embodiment further describes the signal processing method with reference to specific application scenarios.
When the self-interference signal generated by the transmission link is a second harmonic signal, the digital transmission signal transmitted by the transmission link is assumed to be:
Figure GDA0002790615190000084
the up-converted signals are:
Figure GDA0002790615190000085
the second harmonic signal is generated as
Figure GDA0002790615190000086
The response function of leakage or conduction leakage to the receiving link through the PCB is H (t), the frequency domain response is H (omega), and then the second harmonic interference signal received by the receiving link is H (t)
Figure GDA0002790615190000087
After down-conversion, the received second harmonic interference signal is
Figure GDA0002790615190000088
Further, the digital received signal y (t) received by the receiving chain includes a useful signal s (t), a self-interference signal i (t), and a noise signal n (t). In particular, the amount of the solvent to be used,
Figure GDA0002790615190000091
Figure GDA0002790615190000092
in the scene, when a self-interference signal generated by a transmitting link is a second harmonic signal and a receiving link only receives a signal sent by the transmitting link, estimating the frequency domain channel response of the self-interference signal by the following formula;
Figure GDA0002790615190000093
wherein the content of the first and second substances,
Figure GDA0002790615190000094
represents the frequency domain transform of the response function of the second harmonic signal in the receive chain, Y (ω) represents the frequency domain transform of the digital receive signal, and HM (ω) represents the frequency domain transform of the second harmonic signal.
In this scenario, the digital received signal is
Figure GDA0002790615190000095
The corresponding frequency domain response is Y (ω) ═ β H (ω) HM (ω) + N0When there is no interference from the desired signal (or called the desired received signal) s (t), the channel response estimation is more accurate. Transmitting signals based on digital
Figure GDA0002790615190000096
According to hm (t) ═ x2(t) calculating the square signal of the digital transmission signal transmitted by the transmission link, i.e. the numberA square signal of the word transmit signal; according to
Figure GDA0002790615190000097
The frequency domain response of the squared signal in the receive chain is determined.
Where HM (t) represents the squared signal of the digital transmission signal, X (t) represents the digital transmission signal, HM (ω) represents the frequency domain transform of the squared signal, and X (ω) represents the frequency domain transform of the digital transmission signal.
Wherein Y (ω) ═ β H (ω) HM (ω) + N0Substituted into the above
Figure GDA0002790615190000098
To obtain
Figure GDA0002790615190000099
Because the noise is small and can be ignored generally, the signal response estimated according to the above formula is close to the actual transmission performance of the transmitting link, and the actual transmission channel of the receiving link can be accurately estimated.
In a second scenario, when the self-interference signal generated by the transmission link is a second harmonic signal, if a signal strength ratio of a signal strength of a useful signal to a signal strength of the self-interference signal in the digital receiving signal is greater than or equal to a first threshold, the self-interference signal is ignored. That is, when s (t) is much greater than the signal strength of i (t), the self-interference signal has little influence on the reception performance of the useful signal, and the self-interference signal can be ignored. Specifically, the strength of the useful signal s (t) may be obtained by performing RSRP measurement when the transmission link does not send a signal, and the strength of the self-interference signal i (t) of the terminal may be obtained by measuring in an idle time slot where the cell and the neighboring cell do not send a downlink signal, and specifically may be obtained by measuring in a time slot where the received RSSI is selected to be close to N0.
If the signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is smaller than the second threshold value, according to the signal strength ratio
Figure GDA0002790615190000101
Estimating frequency of self-interference signal in time slot of scheduling receiving linkThe domain channel response. Wherein the content of the first and second substances,
Figure GDA0002790615190000102
represents the frequency domain transform of the response function of the second harmonic signal in the receive chain, Y (ω) represents the frequency domain transform of the digital receive signal, and HM (ω) represents the frequency domain transform of the squared signal of the digital transmit signal. In this scenario, the useful signal is much smaller than the self-interference signal, and the channel estimation of the interference signal is relatively accurate, and the channel estimation can be performed in the scenario one manner.
If the signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is greater than or equal to the second threshold and less than the first threshold, according to
Figure GDA0002790615190000103
And jointly estimating the channel response of the self-interference signal by N subcarriers in the time slot of the scheduling receiving link.
Wherein the content of the first and second substances,
Figure GDA0002790615190000104
frequency domain transformation of a response function of a squared signal representing a digital transmission signal on N sub-carriers in a receiving chain, Y (omega)n) Representing the frequency domain transform, HM (omega), of the digital received signal on subcarrier nn) Representing the frequency domain transform of the squared signal on subcarrier n. In this scenario, the signal strength of the useful signal and the self-interference signal and the channel estimation of the interference signal have a large error, and in order to improve the accuracy of the channel estimation, the channel estimation may be performed in a multi-subcarrier joint manner.
Further, the step of constructing the non-linear interference signal of the transmitting link to the receiving link according to the channel response comprises: and constructing a nonlinear interference signal of the transmitting link to the receiving link according to the channel response and the square signal of the digital transmitting signal. The channel response comprises a time domain response and a frequency domain response, so that a nonlinear interference signal in a time domain and a nonlinear interference signal in a frequency domain can be correspondingly constructed. Specifically, according to frequency domain channel response and frequency domain transformation of a square signal of a digital sending signal, a nonlinear interference signal of a sending link to a receiving link on a frequency domain is constructed; and/or constructing a nonlinear interference signal of the transmitting link to the receiving link in the time domain according to the time domain channel response and the square signal of the digital transmitting signal.
Specifically, the step of constructing the non-linear interference signal of the transmitting link to the receiving link in the frequency domain may be implemented by:
according to
Figure GDA0002790615190000111
And constructing a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain.
Wherein the content of the first and second substances,
Figure GDA0002790615190000112
representing a non-linear interfering signal in the frequency domain,
Figure GDA0002790615190000113
represents the frequency domain transform of the response function of the squared signal in the receive chain, and X (ω) represents the frequency domain transform of the digital transmit signal.
As shown in fig. 6, after baseband processing and frequency conversion, the digital signal in the transmitting link sends a radio frequency signal through the antenna, and when the receiving link receives the radio frequency signal, the radio frequency signal generates a digital receiving signal after frequency conversion, and performs self-interference signal channel estimation according to the digital sending signal and the received digital receiving signal of the transmitting link, reconstructs a self-interference signal, and deletes the self-interference signal in the digital receiving signal. The channel response estimation of the second harmonic signal is described above, and the construction of the non-linear interference signal is further described below. The step of constructing the nonlinear interference signal of the transmitting link to the receiving link in the time domain can be realized by the following steps:
according to the frequency domain channel response, converting to obtain a time domain channel response; according to
Figure GDA0002790615190000114
And constructing a nonlinear interference signal of the transmitting link to the receiving link in the time domain. Wherein the content of the first and second substances,
Figure GDA0002790615190000115
representing a non-linear interfering signal in the time domain,
Figure GDA0002790615190000116
represents the time domain transformation of the response function of the squared signal in the receive chain, and x (t) represents the digital transmit signal.
The above describes a scenario in which the self-interference signal is a second harmonic signal, and the following embodiment further describes a scenario in which the cross-modulation signal interferes, specifically, the non-linear component in the digital transmission signal is the cross-modulation signal.
When the self-interference signal generated by the transmission link is an intermodulation signal, the first digital transmission signal transmitted by the transmission link is assumed to be:
Figure GDA0002790615190000117
the up-converted signals are:
Figure GDA0002790615190000118
Figure GDA0002790615190000119
the second digital transmission signal transmitted by the transmission link is:
Figure GDA00027906151900001110
the up-converted signals are:
Figure GDA00027906151900001111
generated intermodulation signal
Figure GDA00027906151900001112
Figure GDA0002790615190000121
The response function of leakage or conduction leakage to the receiving link through the PCB is H (t), the frequency domain response is H (omega), and then the intermodulation interference signal received by the receiving link is
Figure GDA0002790615190000122
The second harmonic interference signal received after down-conversion is
Figure GDA0002790615190000123
Further, the digital received signal y (t) received by the receiving chain includes a useful signal s (t), a self-interference signal i (t), and a noise signal n (t). In particular, the amount of the solvent to be used,
Figure GDA0002790615190000124
Figure GDA0002790615190000125
in the scene, when a self-interference signal generated by a transmitting link is used for cross-modulating a signal, and a receiving link only receives a signal sent by the transmitting link, estimating the frequency domain channel response of the self-interference signal in an idle time slot of a non-scheduled receiving link by the following formula;
Figure GDA0002790615190000126
wherein the content of the first and second substances,
Figure GDA0002790615190000127
represents the frequency domain transformation of the response function of the intermodulation signals in the receiving chain, Y (ω) represents the frequency domain transformation of the digital receiving signal, and HI (ω) represents the frequency domain transformation of the product signal of the first digital transmitting signal and the second digital transmitting signal transmitted by the transmitting chain.
In this scenario, the digital received signal is
Figure GDA0002790615190000128
The corresponding frequency domain response is Y (ω) ═ α H (ω) HI (ω) + N0When there is no interference from the desired signal (or called the desired received signal) s (t), the channel response estimation is more accurate. Transmitting signals based on digital
Figure GDA0002790615190000129
And
Figure GDA00027906151900001210
according to hi (t), x1(t) x2(t), obtaining a product signal of a first digital sending signal and a second digital sending signal sent by a sending link, and obtaining an intermodulation signal of the first digital sending signal and the second digital sending signal; according to
Figure GDA00027906151900001211
The frequency domain response of the multiplied signal in the receive chain is determined.
Where HI (t) represents the product signal of the first digital transmission signal and the second digital transmission signal, X1(t) represents the first digital transmission signal transmitted by the transmit chain, X2(t) represents the second digital transmission signal transmitted by the transmit chain, HI (ω) represents the frequency domain transform of the response function of the product signal in the receive chain, X1(ω) represents the frequency domain transform of the first digital transmission signal, and X2(ω) represents the frequency domain transform of the second digital transmission signal.
Wherein Y (ω) ═ α H (ω) HI (ω) + N0Substituted into the above
Figure GDA0002790615190000131
To obtain
Figure GDA0002790615190000132
Because the noise is small and can be ignored generally, the signal response estimated according to the above formula is close to the actual transmission performance of the transmitting link, and the actual transmission channel of the receiving link can be accurately estimated.
In a second scenario, when the self-interference signal generated by the transmission link is an inter-modulation signal, if a signal strength ratio of a signal strength of a useful signal to a signal strength of the self-interference signal in the digital receiving signal is greater than or equal to a first threshold, the self-interference signal is ignored. That is, when s (t) is much greater than the signal strength of i (t), the self-interference signal has little influence on the reception performance of the useful signal, and the self-interference signal can be ignored. Specifically, the strength of the useful signal s (t) may be obtained by performing RSRP measurement when the transmission link does not send a signal, and the strength of the self-interference signal i (t) of the terminal may be obtained by measuring in an idle time slot where the cell and the neighboring cell do not send a downlink signal, and specifically may be obtained by measuring in a time slot where the received RSSI is selected to be close to N0.
If the signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is smaller than the second threshold value, according to the signal strength ratio
Figure GDA0002790615190000133
And estimating the frequency domain channel response of the self-interference signal in the time slot of the scheduling receiving link. Wherein the content of the first and second substances,
Figure GDA0002790615190000134
represents the frequency domain transform of the response function of the multiplied signal in the receiving chain, Y (ω) represents the frequency domain transform of the digital received signal, and HI (ω) represents the frequency domain transform of the multiplied signal. In this scenario, the useful signal is much smaller than the self-interference signal, and the channel estimation of the interference signal is relatively accurate, and the channel estimation can be performed in the scenario one manner.
If the signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is greater than or equal to the second threshold and less than the first threshold, according to
Figure GDA0002790615190000135
And jointly estimating the channel response of the self-interference signal by N subcarriers in the time slot of the scheduling receiving link.
Wherein the content of the first and second substances,
Figure GDA0002790615190000141
frequency domain transformation, Y (omega), representing the response function of the product signal of the first digital transmission signal and the second digital transmission signal on sub-carriers 1 to N in the receiving chainn) Representing the frequency-domain transformation, HI (omega), of the digital received signal on subcarrier nn) Representing the frequency domain transform of the product signal on subcarrier n. In this scenario, the signal strength of the useful signal and the self-interference signal and the channel estimation of the interference signal have a large error, and in order to improve the accuracy of the channel estimation, the channel estimation may be performed in a multi-subcarrier joint manner.
Further, the step of constructing the non-linear interference signal of the transmitting link to the receiving link according to the channel response comprises: and constructing a nonlinear interference signal of the transmitting link to the receiving link according to a product signal of the channel response and the digital transmission signal. The channel response comprises a time domain response and a frequency domain response, so that a nonlinear interference signal in a time domain and a nonlinear interference signal in a frequency domain can be correspondingly constructed. Specifically, according to the frequency domain channel response and the frequency domain transformation of the product signal of the digital sending signal, a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain is constructed; and/or constructing a non-linear interference signal of the transmitting link to the receiving link in the time domain according to the product signal of the time domain channel response and the digital transmitting signal.
Specifically, the step of constructing the non-linear interference signal of the transmitting link to the receiving link in the frequency domain may be implemented by:
according to
Figure GDA0002790615190000142
And constructing a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain.
Wherein the content of the first and second substances,
Figure GDA0002790615190000143
representing a non-linear interfering signal in the frequency domain,
Figure GDA0002790615190000144
representing the frequency domain transform of the response function of the multiplied signal in the receiving chain, X1(ω) representing the frequency domain transform of the first digital transmitted signal, and X2(ω) representing the frequency domain transform of the second digital transmitted signal.
The channel response estimation of the intermodulation signal is described above, and the construction of the non-linear interference signal is further described below. The step of constructing the nonlinear interference signal of the transmitting link to the receiving link in the time domain can be realized by the following steps:
according to the frequency domain channel response, converting to obtain a time domain channel response; according to
Figure GDA0002790615190000145
Figure GDA0002790615190000146
And constructing a nonlinear interference signal of the transmitting link to the receiving link in the time domain. Wherein the content of the first and second substances,
Figure GDA0002790615190000147
representing a non-linear interfering signal in the time domain,
Figure GDA0002790615190000148
representing the time domain response function of the product signal at the receiving chain, x1(t) representing the first digital transmit signal transmitted by the transmit chain, and x2(t) representing the second digital transmit signal transmitted by the transmit chain.
As shown in fig. 7, after the first digital transmission signal and the second digital transmission signal in the transmission link are processed by the baseband and frequency-converted, a radio frequency signal is transmitted through the antenna, and when the reception link receives the radio frequency signal, the radio frequency signal is frequency-converted to generate a digital reception signal, and according to the digital transmission signal of the transmission link and the received digital reception signal, channel estimation of the intermodulation signal is performed, the intermodulation signal is reconstructed, and the reconstructed intermodulation signal is deleted from the digital reception signal.
The self-interference signal constructed by the method can be accurately close to the self-interference signal actually generated, and in addition, a higher-order harmonic interference signal and a more-frequency intermodulation interference signal can be constructed by referring to the method.
Further, after constructing the self-interference signal, step 23 is specifically implemented by:
in the first mode, when the timing advance of the transmitting link and the receiving link is greater than a preset threshold value, the nonlinear interference signal in the receiving link is filtered in a time domain.
In particular, according to
Figure GDA0002790615190000151
And filtering out nonlinear interference signals in a receiving link. Wherein the content of the first and second substances,
Figure GDA0002790615190000152
representing a desired signal in the digital receive signal, y (t) representing the digital receive signal received by the receive chain,
Figure GDA0002790615190000153
representing non-linear interference signals of the transmit chain to the receive chain in the time domain, 2TAIndicating the timing advance of the transmit chain and the receive chain. The predetermined threshold is related to a Cyclic Prefix (CP) of the OFDM system, for example, the predetermined threshold is CP/2.
Assuming that the F1 frequency of the network device is aligned with the clock of the F2 frequency by D meters, the terminal needs to advance T byATransmitting, wherein TA＝D/C＝D/3e2. The reception link of the terminal may lag behind TAArrival, then transmission is advanced by 2T compared to receptionA. For a receiving link, whether the network is synchronous or not, the receiving and transmitting node can accurately obtain the timing advance 2TAWhen the interference is deleted, the influence factor of the time difference needs to be considered. For example, when the coverage distance is 300 meters, the time difference is 2us, which basically ensures that the interference cancellation in the frequency domain can be directly performed in the CP (taking 4.7us of LTE as an example), that is, the interference cancellation in the frequency domain is directly performed. When the coverage distance exceeds 700 meters, the normal CP length of the OFDM is exceeded, and signal orthogonality cannot be guaranteed, so that time domain interference deletion is needed, namely, interference signals are restored to the time domain, a time difference of receiving and transmitting is introduced, and interference deletion is conducted in the time domain.
And secondly, when the timing advance is smaller than or equal to the preset threshold value, filtering out the nonlinear interference signal in the receiving link in the frequency domain.
In particular, according to
Figure GDA0002790615190000154
And filtering out nonlinear interference signals on a frequency domain in a receiving link. Wherein the content of the first and second substances,
Figure GDA0002790615190000161
representing in a digital received signalA frequency domain transform of the wanted signal, Y (ω) representing the frequency domain transform of the digital received signal received by the receiving chain,
Figure GDA0002790615190000162
representing the frequency domain transformation of the non-linear interfering signal of the transmit chain to the receive chain.
In addition to the above-described scenarios, the embodiment of the present invention will be further described with reference to a Multiple-Input Multiple-Output (MIMO) scenario.
In particular, the transceiving node comprises at least two transmit chains and/or at least two receive chains. When the transceiver node includes one transmitting link and multiple receiving links, the self-interference signal may be constructed in the manner of the above scenario one and scenario two, and the self-interference signal is deleted in each receiving link. When the receiving and transmitting node comprises at least two transmitting links and one or more receiving links, the nonlinear interference signals of each transmitting link to the receiving links are constructed according to at least two digital transmitting signals and digital receiving signals transmitted by the at least two transmitting links. And all nonlinear interference signals in each receiving link are respectively filtered. All the nonlinear interference signals are superposed signals of the nonlinear interference signals of the transmitting chains and the receiving chains.
Taking the first and second transmissions as an example, one transmitting link may generate interference to two receiving links, respectively, and according to the method in the above embodiment, channel response estimation and interference signal construction may be performed on the two receiving links, respectively, and the constructed interference signal is deleted. Taking two-transmission-one-reception as an example, interference signals generated on a receiving link by two transmitting links are different, so that channel response estimation and interference signal construction need to be performed based on digital transmitting signals of the two transmitting links respectively, and the sum of the interference signals of the two transmitting links is deleted on the receiving link. It should be noted that when the data information sent by the two transmission links is completely the same, the interference signal of one of the transmission links may be constructed and deleted.
In the foregoing, the signal processing method according to the embodiment of the present invention is described, where it is worth pointing out that the above-mentioned transceiving node includes a terminal or a network device. Namely, the signal processing method is suitable for all mobile communication terminal equipment, base station equipment and other multi-band wireless communication systems which support the receiving and sending synchronization.
Further, when the transceiver node is a terminal, since not all terminals in the system have the self-interference cancellation capability, the terminal needs to report terminal capability information indicating whether the nonlinear interference signal filtering capability is supported to the network device. Correspondingly, when the transceiver node is a network device, it is necessary to receive terminal capability information that is reported by the terminal and used for indicating whether the nonlinear interference signal filtering capability is supported.
In the signal processing method of the embodiment of the invention, the transceiving node estimates the non-linear interference signal which is transmitted by the transmitting link and received and caused by the receiving link according to the digital transmitting signal transmitted by the transmitting link and the digital receiving signal received by the receiving link, and further deletes the non-linear interference signal in the receiving link, so as to improve the multi-frequency working performance of the transceiving node and improve the system spectrum efficiency.
The foregoing embodiments respectively describe in detail the signal processing methods in different scenarios, and the following embodiments further describe the corresponding transceiving nodes with reference to the accompanying drawings.
As shown in fig. 3, a transceiving node 300 according to an embodiment of the present invention includes at least one transmitting link and at least one receiving link, where working frequency points of the transmitting link and the receiving link are different; the digital sending signal sent by the sending link and the digital receiving signal received by the receiving link can be obtained in the embodiment; constructing a nonlinear interference signal of a transmitting link to a receiving link according to the digital transmitting signal and the digital receiving signal; the details of the method for filtering out the non-linear interference signal in the receiving link and achieving the same effect, the transceiver node 300 further includes the following functional modules:
a first obtaining module 310, configured to obtain a digital sending signal sent by a sending link and a digital receiving signal received by a receiving link;
a constructing module 320, configured to construct a nonlinear interference signal of the transmitting link to the receiving link according to the digital transmitting signal and the digital receiving signal;
and a filtering module 330, configured to filter out a nonlinear interference signal in the receive link.
Wherein, the transceiving node 300 further comprises:
the second acquisition module is used for acquiring a useful signal and a self-interference signal in the digital receiving signal;
and the processing module is used for not executing the steps of constructing and filtering the nonlinear interference signal if the signal strength ratio of the signal strength of the useful signal in the digital receiving signal to the signal strength of the self-interference signal is greater than or equal to a first threshold.
Specifically, the second obtaining module includes:
the first acquisition submodule is used for acquiring a useful signal in a digital receiving signal received by a receiving link when a transmitting link does not send the signal;
and the second acquisition sub-module is used for acquiring the self-interference signal in the digital receiving signal received by the receiving link when the receiving link only receives the signal sent by the transmitting link.
Wherein the building block 320 comprises:
the estimation submodule is used for estimating the channel response of a self-interference signal generated by a transmitting link in a receiving link according to the digital transmitting signal and the digital receiving signal;
and the constructing submodule is used for constructing the nonlinear interference signal of the transmitting link to the receiving link according to the channel response.
Wherein the estimation submodule comprises:
a first estimation unit, configured to estimate a frequency domain channel response of a self-interference signal generated by a transmit link in a receive link according to a digital transmit signal and a digital receive signal; and/or the presence of a gas in the gas,
and the second estimation unit is used for estimating the time domain channel response of the self-interference signal generated by the transmitting link in the receiving link according to the digital transmitting signal and the digital receiving signal.
Wherein the first estimation unit includes:
a first estimating subunit, configured to estimate a frequency domain channel response of the self-interference signal by dividing a frequency domain transform of the digital received signal by a frequency domain transform of a non-linear component of the digital transmitted signal when the receiving link receives only the signal transmitted by the transmitting link; the specific formula is as follows:
Figure GDA0002790615190000181
wherein the content of the first and second substances,
Figure GDA0002790615190000182
represents the frequency domain transformation of the nonlinear component of the digital transmit signal in the receive chain in response to a function, Y (ω) represents the frequency domain transformation of the digital receive signal, and HNL (ω) represents the frequency domain transformation of the nonlinear component of the digital transmit signal.
Wherein the first estimating unit further comprises:
a second estimating subunit, configured to, if a signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is smaller than a second threshold value, based on
Figure GDA0002790615190000183
Estimating a frequency domain channel response of the self-interference signal; wherein the content of the first and second substances,
Figure GDA0002790615190000184
representing the frequency domain transformation of the nonlinear component of the digital transmit signal in the receive chain in response to a function, Y (ω) representing the frequency domain transformation of the digital receive signal, HNL (ω) representing the frequency domain transformation of the nonlinear component of the digital transmit signal;
a third estimating subunit, configured to, if a signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is greater than or equal to the second threshold and smaller than the first threshold, according to
Figure GDA0002790615190000185
Figure GDA0002790615190000186
Estimating channel response of the self-interference signal by N subcarriers jointly; wherein the content of the first and second substances,
Figure GDA0002790615190000191
frequency domain transformation, Y (omega), representing the response function of the nonlinear component of a digital transmitted signal on sub-carriers 1 to N in the receiving chainn) Representing the frequency domain transform of the digital received signal on subcarrier n, HNL (omega)n) Representing a frequency domain transformation of the non-linear component of the digital transmitted signal on subcarrier n.
Wherein the value of N is proportional to the signal strength ratio.
Wherein the estimation submodule further comprises:
the first acquisition unit is used for acquiring a useful signal in a digital receiving signal received by a receiving link when a transmitting link does not send the signal;
and the second acquisition unit is used for acquiring the self-interference signal in the digital receiving signal received by the receiving link when the receiving link only receives the signal sent by the transmitting link.
Wherein, when the self-interference signal is a second harmonic signal, the first estimating unit further includes:
a first obtaining subunit, configured to obtain x according to hm (t) ═ x2(t) calculating a squared signal of the digital transmission signal transmitted by the transmission link;
a first determining subunit for determining based on
Figure GDA0002790615190000192
Determining a frequency domain response of the squared signal in the receive chain;
where HM (t) represents the squared signal of the digital transmission signal, X (t) represents the digital transmission signal, HM (ω) represents the frequency domain transform of the squared signal, and X (ω) represents the frequency domain transform of the digital transmission signal.
Wherein, the construction submodule comprises:
and the first construction unit is used for constructing the nonlinear interference signal of the transmitting link to the receiving link according to the channel response and the square signal of the digital transmitting signal.
Wherein, the first construction unit is used for comprising:
the first constructing subunit is used for constructing a nonlinear interference signal of a transmitting link to a receiving link in a frequency domain according to the frequency domain channel response and the frequency domain transformation of the square signal of the digital transmitting signal; and/or the presence of a gas in the gas,
and the second constructing subunit is used for constructing the nonlinear interference signal of the transmitting link to the receiving link in the time domain according to the time domain channel response and the square signal of the digital transmitting signal.
Wherein the first building subunit is specifically configured to:
according to
Figure GDA0002790615190000193
Constructing a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain;
wherein the content of the first and second substances,
Figure GDA0002790615190000201
representing a non-linear interfering signal in the frequency domain,
Figure GDA0002790615190000202
represents the frequency domain transform of the response function of the squared signal in the receive chain, and X (ω) represents the frequency domain transform of the digital transmit signal.
Wherein the second building subunit is specifically configured to:
according to the frequency domain channel response, converting to obtain a time domain channel response;
according to
Figure GDA0002790615190000203
Constructing a nonlinear interference signal of a transmitting link to a receiving link on a time domain;
wherein the content of the first and second substances,
Figure GDA0002790615190000204
representing a non-linear interfering signal in the time domain,
Figure GDA0002790615190000205
represents the time domain transformation of the response function of the squared signal in the receive chain, and x (t) represents the digital transmit signal.
Wherein, when the self-interference signal is an inter-modulation signal, the first estimating unit further includes:
a second obtaining subunit, configured to obtain a product signal of the first digital transmission signal and the second digital transmission signal transmitted by the transmission link according to hi (t) ═ x1(t) · x2 (t);
a second determining subunit for determining based on
Figure GDA0002790615190000206
Determining a frequency domain response of the product signal in the receive chain;
where HI (t) represents a product signal of the first digital transmission signal and the second digital transmission signal, X1(t) represents the first digital transmission signal transmitted by the transmit chain, X2(t) represents the second digital transmission signal transmitted by the transmit chain, HI (ω) represents a frequency domain transform of a response function of the intermodulation signal in the receive chain, X1(ω) represents a frequency domain transform of the first digital transmission signal, and X2(ω) represents a frequency domain transform of the first digital transmission signal.
Wherein, the construction submodule comprises:
and the second construction unit is used for constructing the nonlinear interference signal of the transmitting link to the receiving link according to the product signal of the channel response and the digital transmitting signal.
Wherein the second construction unit comprises:
the third constructing subunit is used for constructing a nonlinear interference signal of the transmitting link to the receiving link in the frequency domain according to the frequency domain channel response and the frequency domain transformation of the product signal of the digital transmitting signal; and/or the presence of a gas in the gas,
and the fourth constructing subunit is used for constructing the nonlinear interference signal of the transmitting link to the receiving link in the time domain according to the product signal of the time domain channel response and the digital transmitting signal.
Wherein the third building subunit is specifically configured to:
according to
Figure GDA0002790615190000211
Constructing a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain;
wherein the content of the first and second substances,
Figure GDA0002790615190000212
representing a non-linear interfering signal in the frequency domain,
Figure GDA0002790615190000213
representing the frequency domain transform of the response function of the multiplied signal in the receiving chain, X1(ω) representing the frequency domain transform of the first digital transmitted signal, and X2(ω) representing the frequency domain transform of the second digital transmitted signal.
Wherein the fourth building subunit is specifically configured to:
according to the frequency domain channel response, converting to obtain a time domain channel response;
according to
Figure GDA0002790615190000214
Constructing a nonlinear interference signal of a transmitting link to a receiving link on a time domain;
wherein the content of the first and second substances,
Figure GDA0002790615190000215
representing a non-linear interfering signal in the time domain,
Figure GDA0002790615190000216
representing the time domain response function of the product signal at the receiving chain, x1(t) representing the first digital transmit signal transmitted by the transmit chain, and x2(t) representing the second digital transmit signal transmitted by the transmit chain.
Wherein, filtering module includes:
the first filtering submodule is used for filtering a nonlinear interference signal in a receiving link in a time domain when the timing advance of the transmitting link and the receiving link is greater than a preset threshold value;
and the second filtering submodule is used for filtering the nonlinear interference signal in the frequency domain when the timing advance is less than or equal to a preset threshold value.
Wherein, first filtering submodule includes:
a first filtering unit for filtering the first and second signals
Figure GDA0002790615190000217
Filtering out nonlinear interference signals in a receiving link;
wherein the content of the first and second substances,
Figure GDA0002790615190000218
representing a desired signal in the digital receive signal, y (t) representing the digital receive signal received by the receive chain,
Figure GDA0002790615190000219
representing non-linear interference signals of the transmit chain to the receive chain in the time domain, 2TAIndicating the timing advance of the transmit chain and the receive chain.
Wherein the second filtering submodule comprises:
a second filtering unit for filtering the first and second signals
Figure GDA00027906151900002110
Filtering out nonlinear interference signals on a frequency domain in a receiving link;
wherein the content of the first and second substances,
Figure GDA0002790615190000221
representing a frequency domain transform of a desired signal in the digital received signal, Y (ω) representing a frequency domain transform of the digital received signal received by the receive chain,
Figure GDA0002790615190000222
representing the frequency domain transformation of the non-linear interfering signal of the transmit chain to the receive chain.
Wherein, when the transceiving node comprises at least two transmitting links, the construction module is specifically configured to:
and constructing nonlinear interference signals of each transmitting link to the receiving link according to at least two digital transmitting signals and digital receiving signals transmitted by at least two transmitting links respectively.
Wherein, filtering module specifically is used for:
respectively filtering all nonlinear interference signals in each receiving link; all the nonlinear interference signals are superposed signals of the nonlinear interference signals of the transmitting chains and the receiving chains.
Wherein the transceiving node 300 comprises a terminal or a network device.
Wherein, when the transceiving node 300 is a terminal, the transceiving node 300 further comprises:
and the reporting module is used for reporting the terminal capability information used for indicating whether the nonlinear interference signal filtering capability is supported or not to the network equipment.
When the transceiving node 300 is a network device, the transceiving node 300 further includes:
and the receiving module is used for receiving the terminal capability information which is reported by the terminal and used for indicating whether the nonlinear interference signal filtering capability is supported.
It is worth pointing out that, the transceiving node according to the embodiment of the present invention estimates a non-linear interference signal, which is transmitted by the transmit link and received and caused by the receive link, according to the digital transmit signal transmitted by the transmit link and the digital receive signal received by the receive link, and further deletes the non-linear interference signal in the receive link, so as to improve the multi-frequency operating performance of the transceiving node and improve the system spectrum efficiency.
It should be noted that, in the above transceiving nodes, whether they are network devices or terminals, the division of the respective modules is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; and part of the modules can be realized in the form of calling software by the processing element, and part of the modules can be realized in the form of hardware. For example, the determining module may be a processing element separately set up, or may be implemented by being integrated in a chip of the apparatus, or may be stored in a memory of the apparatus in the form of program code, and the function of the determining module is called and executed by a processing element of the apparatus. Other modules are implemented similarly. In addition, all or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software.
For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when one of the above modules is implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).
In order to better achieve the above object, an embodiment of the present invention further provides a network device, which includes a processor, a memory, and a computer program stored in the memory and executable on the processor, and the processor implements the steps in the signal processing method as described above when executing the computer program. Embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, and when being executed by a processor, the computer program implements the steps of the signal processing method as described above.
Specifically, the embodiment of the invention also provides a network device. As shown in fig. 4, the network device 400 includes: antenna 41, radio frequency device 42, baseband device 43. The antenna 41 is connected to a radio frequency device 42. In the uplink direction, the rf device 42 receives information via the antenna 41 and sends the received information to the baseband device 43 for processing. In the downlink direction, the baseband device 43 processes the information to be transmitted and transmits the processed information to the rf device 42, and the rf device 42 processes the received information and transmits the processed information through the antenna 41. Among them, this network device 400 includes: the working frequency points of the at least one transmitting link and the at least one receiving link are different.
The above-mentioned band processing means may be located in the baseband means 43, and the method performed by the network device in the above embodiment may be implemented in the baseband means 43, where the baseband means 43 includes the processor 44 and the memory 45.
The baseband device 43 may include, for example, at least one baseband board, on which a plurality of chips are disposed, as shown in fig. 4, wherein one of the chips, for example, the processor 44, is connected to the memory 45 to call up the program in the memory 45 to perform the network device operation shown in the above method embodiment.
The baseband device 43 may further include a network interface 46, such as a Common Public Radio Interface (CPRI), for exchanging information with the radio frequency device 42.
The processor may be a single processor or a combination of multiple processing elements, for example, the processor may be a CPU, an ASIC, or one or more integrated circuits configured to implement the methods performed by the network devices, for example: one or more microprocessors DSP, or one or more field programmable gate arrays FPGA, or the like. The storage element may be a memory or a combination of a plurality of storage elements.
The memory 45 may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. The volatile Memory may be a Random Access Memory (RAM) which serves as an external cache. By way of example and not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (ddr Data Rate SDRAM), Enhanced SDRAM (ESDRAM), synchlronous DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 45 described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
Specifically, the network device 400 according to the embodiment of the present invention further includes: a computer program stored in memory 45 and executable on processor 44, processor 44 calling the computer program in memory 45 to perform the method performed by the modules shown in fig. 3.
In particular, the computer program, when invoked by the processor 44, is operable to perform: acquiring a digital sending signal sent by a sending link and a digital receiving signal received by a receiving link;
constructing a nonlinear interference signal of a transmitting link to a receiving link according to the digital transmitting signal and the digital receiving signal;
and filtering out nonlinear interference signals in a receiving link.
In particular, the computer program, when invoked by the processor 44, is operable to perform: acquiring a useful signal and a self-interference signal in a digital receiving signal;
and if the signal intensity ratio of the signal intensity of the useful signal to the signal intensity of the self-interference signal in the digital receiving signal is greater than or equal to the first threshold, the steps of constructing and filtering the non-linear interference signal are not executed.
In particular, the computer program, when invoked by the processor 44, is operable to perform: when the transmitting link does not send signals, useful signals in the digital receiving signals received by the receiving link are obtained;
when the receiving link only receives the signal sent by the transmitting link, the self-interference signal in the digital receiving signal received by the receiving link is obtained.
In particular, the computer program, when invoked by the processor 44, is operable to perform: estimating the channel response of a self-interference signal generated by a transmitting link in a receiving link according to the digital transmitting signal and the digital receiving signal;
and constructing a nonlinear interference signal of the transmitting link to the receiving link according to the channel response.
In particular, the computer program, when invoked by the processor 44, is operable to perform: estimating the frequency domain channel response of a self-interference signal generated by a transmitting link in a receiving link according to the digital transmitting signal and the digital receiving signal; and/or the presence of a gas in the gas,
and estimating the time domain channel response of the self-interference signal generated by the transmitting chain in the receiving chain according to the digital transmitting signal and the digital receiving signal.
In particular, the computer program, when invoked by the processor 44, is operable to perform: when a receiving link only receives the signal sent by the transmitting link, estimating the frequency domain channel response of the self-interference signal by dividing the frequency domain transformation of the digital receiving signal and the frequency domain transformation of the nonlinear component of the digital sending signal; the specific formula is as follows:
Figure GDA0002790615190000251
wherein the content of the first and second substances,
Figure GDA0002790615190000252
represents the frequency domain transformation of the nonlinear component of the digital transmit signal in the receive chain in response to a function, Y (ω) represents the frequency domain transformation of the digital receive signal, and HNL (ω) represents the frequency domain transformation of the nonlinear component of the digital transmit signal.
In particular, the computer program, when invoked by the processor 44, is operable to perform:
if the signal strength of the useful signal is equal toThe signal strength ratio of the signal strength of the self-interference signal is smaller than a second threshold value according to
Figure GDA0002790615190000261
Estimating a frequency domain channel response of the self-interference signal; wherein the content of the first and second substances,
Figure GDA0002790615190000262
representing the frequency domain transformation of the nonlinear component of the digital transmit signal in the receive chain in response to a function, Y (ω) representing the frequency domain transformation of the digital receive signal, HNL (ω) representing the frequency domain transformation of the nonlinear component of the digital transmit signal;
if the signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is greater than or equal to the second threshold and less than the first threshold, according to
Figure GDA0002790615190000263
Estimating channel response of the self-interference signal by N subcarriers jointly; wherein the content of the first and second substances,
Figure GDA0002790615190000264
frequency domain transformation, Y (omega), representing the response function of the nonlinear component of a digital transmitted signal on sub-carriers 1 to N in the receiving chainn) Representing the frequency domain transform of the digital received signal on subcarrier n, HNL (omega)n) Representing a frequency domain transformation of the non-linear component of the digital transmitted signal on subcarrier n.
Wherein the value of N is proportional to the signal strength ratio.
In particular, when the self-interference signal is a second harmonic signal, the computer program is operable when invoked by the processor 44 to perform: according to hm (t) ═ x2(t) calculating a squared signal of the digital transmission signal transmitted by the transmission link;
according to
Figure GDA0002790615190000265
Determining a frequency domain response of the squared signal in the receive chain;
where HM (t) represents the squared signal of the digital transmission signal, X (t) represents the digital transmission signal, HM (ω) represents the frequency domain transform of the squared signal, and X (ω) represents the frequency domain transform of the digital transmission signal.
In particular, the computer program, when invoked by the processor 44, is operable to perform: and constructing a nonlinear interference signal of the transmitting link to the receiving link according to the channel response and the square signal of the digital transmitting signal.
In particular, the computer program, when invoked by the processor 44, is operable to perform:
constructing a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain according to the frequency domain channel response and the frequency domain transformation of the square signal of the digital transmitting signal; and/or the presence of a gas in the gas,
and constructing a nonlinear interference signal of the transmitting link to the receiving link in the time domain according to the time domain channel response and the square signal of the digital transmitting signal.
In particular, the computer program, when invoked by the processor 44, is operable to perform:
according to
Figure GDA0002790615190000271
Constructing a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain;
wherein the content of the first and second substances,
Figure GDA0002790615190000272
representing a non-linear interfering signal in the frequency domain,
Figure GDA0002790615190000273
represents the frequency domain transform of the response function of the squared signal in the receive chain, and X (ω) represents the frequency domain transform of the digital transmit signal.
In particular, the computer program, when invoked by the processor 44, is operable to perform:
according to the frequency domain channel response, converting to obtain a time domain channel response;
according to
Figure GDA0002790615190000274
Constructing non-linearities of a transmit chain to a receive chain in the time domainAn interference signal;
wherein the content of the first and second substances,
Figure GDA0002790615190000275
representing a non-linear interfering signal in the time domain,
Figure GDA0002790615190000276
represents the time domain transformation of the response function of the squared signal in the receive chain, and x (t) represents the digital transmit signal.
In particular, when the self-interference signal is an inter-modulation signal, the computer program, when invoked by the processor 44, is operable to perform:
acquiring a product signal of a first digital transmission signal and a second digital transmission signal transmitted by a transmission link according to hi (t), x1(t) x2 (t);
according to
Figure GDA0002790615190000277
Determining a frequency domain response of the product signal in the receive chain;
where HI (t) represents a product signal of the first digital transmission signal and the second digital transmission signal, X1(t) represents the first digital transmission signal transmitted by the transmit chain, X2(t) represents the second digital transmission signal transmitted by the transmit chain, HI (ω) represents a frequency domain transform of a response function of the intermodulation signal in the receive chain, X1(ω) represents a frequency domain transform of the first digital transmission signal, and X2(ω) represents a frequency domain transform of the second digital transmission signal.
In particular, the computer program, when invoked by the processor 44, is operable to perform: and constructing a nonlinear interference signal of the transmitting link to the receiving link according to a product signal of the channel response and the digital transmission signal.
In particular, the computer program, when invoked by the processor 44, is operable to perform:
constructing a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain according to the frequency domain transformation of a product signal of the frequency domain channel response and the digital transmitting signal; and/or the presence of a gas in the gas,
and constructing a nonlinear interference signal of the transmitting link to the receiving link in the time domain according to the product signal of the time domain channel response and the digital transmitting signal.
In particular, the computer program, when invoked by the processor 44, is operable to perform:
according to
Figure GDA0002790615190000281
Constructing a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain;
wherein the content of the first and second substances,
Figure GDA0002790615190000282
representing a non-linear interfering signal in the frequency domain,
Figure GDA0002790615190000283
representing the frequency domain transform of the response function of the multiplied signal in the receiving chain, X1(ω) representing the frequency domain transform of the first digital transmitted signal, and X2(ω) representing the frequency domain transform of the second digital transmitted signal.
In particular, the computer program, when invoked by the processor 44, is operable to perform: according to the frequency domain channel response, converting to obtain a time domain channel response;
according to
Figure GDA0002790615190000284
Constructing a nonlinear interference signal of a transmitting link to a receiving link on a time domain;
wherein the content of the first and second substances,
Figure GDA0002790615190000285
representing a non-linear interfering signal in the time domain,
Figure GDA0002790615190000286
representing the time domain transformation of the response function of the product signal in the receive chain, x1(t) representing the first digital transmit signal transmitted by the transmit chain, and x2(t) representing the second digital transmit signal transmitted by the transmit chain.
In particular, the computer program, when invoked by the processor 44, is operable to perform:
when the timing advance of the transmitting link and the receiving link is greater than a preset threshold value, filtering out a nonlinear interference signal in the receiving link in a time domain;
and when the timing advance is less than or equal to a preset threshold value, filtering out the nonlinear interference signal in the receiving link in the frequency domain.
In particular, the computer program, when invoked by the processor 44, is operable to perform:
according to
Figure GDA0002790615190000291
Filtering out nonlinear interference signals in a receiving link;
wherein the content of the first and second substances,
Figure GDA0002790615190000292
representing a desired signal in the digital receive signal, y (t) representing the digital receive signal received by the receive chain,
Figure GDA0002790615190000293
representing non-linear interference signals of the transmit chain to the receive chain in the time domain, 2TAIndicating the timing advance of the transmit chain and the receive chain.
In particular, the computer program, when invoked by the processor 44, is operable to perform: according to
Figure GDA0002790615190000294
Figure GDA0002790615190000295
Filtering out nonlinear interference signals on a frequency domain in a receiving link;
wherein the content of the first and second substances,
Figure GDA0002790615190000296
representing a frequency domain transform of a desired signal in the digital received signal, Y (ω) representing a frequency domain transform of the digital received signal received by the receive chain,
Figure GDA0002790615190000297
representing the frequency domain transformation of the non-linear interfering signal of the transmit chain to the receive chain.
In particular, the computer program, when invoked by the processor 44, is operable to perform: and constructing nonlinear interference signals of each transmitting link to the receiving link according to at least two digital transmitting signals and digital receiving signals transmitted by at least two transmitting links respectively.
In particular, the computer program, when invoked by the processor 44, is operable to perform: respectively filtering all nonlinear interference signals in each receiving link; all the nonlinear interference signals are superposed signals of the nonlinear interference signals of the transmitting chains and the receiving chains.
In particular, the computer program, when invoked by the processor 44, is operable to perform: and receiving terminal capability information which is reported by the terminal and used for indicating whether the nonlinear interference signal filtering capability is supported.
The network device may be a Base Transceiver Station (BTS) in Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB, eNodeB) in LTE, a relay Station, an Access point, a Base Station in a future 5G network, or the like, which is not limited herein.
The network equipment in the embodiment of the invention estimates the nonlinear interference signal which is transmitted by the transmitting link and is received and interfered by the receiving link according to the digital transmitting signal transmitted by the transmitting link and the digital receiving signal received by the receiving link, and further deletes the nonlinear interference signal in the receiving link, thereby improving the multi-frequency working performance of the transmitting-receiving node and improving the spectrum efficiency of the system.
In order to better achieve the above object, an embodiment of the present invention further provides a terminal, which includes a processor, a memory, and a computer program stored in the memory and running on the processor, and when the processor executes the computer program, the steps in the signal processing method described above are implemented. An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the signal processing method described above.
Specifically, fig. 5 is a block diagram of a terminal 500 according to another embodiment of the present invention, where the terminal shown in fig. 5 includes: at least one processor 501, memory 502, a user interface 503, and a network interface 504. The various components in terminal 500 are coupled together by a bus system 505. It is understood that the bus system 505 is used to enable connection communications between these components. The bus system 505 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 505 in FIG. 5. Wherein, the terminal 500 includes: the working frequency points of the at least one transmitting link and the at least one receiving link are different.
The user interface 503 may include, among other things, a display or a pointing device (e.g., a touch sensitive pad or touch screen, etc.).
It is to be understood that the memory 502 in embodiments of the present invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (ddr Data Rate SDRAM, ddr SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 502 of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
In some embodiments, memory 502 stores elements, executable modules or data structures, or a subset thereof, or an expanded set thereof as follows: an operating system 5021 and application programs 5022.
The operating system 5021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application 5022 includes various applications, such as a Media Player (Media Player), a Browser (Browser), and the like, for implementing various application services. The program for implementing the method according to the embodiment of the present invention may be included in the application program 5022.
In an embodiment of the present invention, the terminal 500 further includes: a computer program stored on the memory 502 and executable on the processor 501, in particular a computer program in the application 5022, which when executed by the processor 501 performs the following steps: acquiring a digital sending signal sent by the sending link and a digital receiving signal received by the receiving link; constructing a nonlinear interference signal of the transmitting link to the receiving link according to the digital transmitting signal and the digital receiving signal; filtering the nonlinear interference signal in the receiving chain.
The method disclosed by the above-mentioned embodiments of the present invention may be applied to the processor 501, or implemented by the processor 501. The processor 501 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 501. The Processor 501 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 502, and the processor 501 reads the information in the memory 502 and completes the steps of the method in combination with the hardware.
It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the Processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units configured to perform the functions described herein, or a combination thereof.
For a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.
In particular, the computer program, when executed by the processor 501, may further implement the steps of: acquiring a digital sending signal sent by a sending link and a digital receiving signal received by a receiving link;
constructing a nonlinear interference signal of a transmitting link to a receiving link according to the digital transmitting signal and the digital receiving signal;
and filtering out nonlinear interference signals in a receiving link.
In particular, the computer program, when executed by the processor 501, may further implement the steps of: acquiring a useful signal and a self-interference signal in a digital receiving signal;
and if the signal intensity ratio of the signal intensity of the useful signal to the signal intensity of the self-interference signal in the digital receiving signal is greater than or equal to the first threshold, the steps of constructing and filtering the non-linear interference signal are not executed.
In particular, the computer program, when executed by the processor 501, may further implement the steps of: when the transmitting link does not send signals, useful signals in the digital receiving signals received by the receiving link are obtained;
when the receiving link only receives the signal sent by the transmitting link, the self-interference signal in the digital receiving signal received by the receiving link is obtained.
In particular, the computer program, when executed by the processor 501, may further implement the steps of: estimating the channel response of a self-interference signal generated by a transmitting link in a receiving link according to the digital transmitting signal and the digital receiving signal;
and constructing a nonlinear interference signal of the transmitting link to the receiving link according to the channel response.
In particular, the computer program, when executed by the processor 501, may further implement the steps of: estimating the frequency domain channel response of a self-interference signal generated by a transmitting link in a receiving link according to the digital transmitting signal and the digital receiving signal; and/or the presence of a gas in the gas,
and estimating the time domain channel response of the self-interference signal generated by the transmitting chain in the receiving chain according to the digital transmitting signal and the digital receiving signal.
In particular, the computer program, when executed by the processor 501, may further implement the steps of:
when a receiving link only receives the signal sent by the transmitting link, estimating the frequency domain channel response of the self-interference signal by dividing the frequency domain transformation of the digital receiving signal and the frequency domain transformation of the nonlinear component of the digital sending signal; the specific formula is as follows:
Figure GDA0002790615190000331
wherein the content of the first and second substances,
Figure GDA0002790615190000332
represents the frequency domain transformation of the nonlinear component of the digital transmit signal in the receive chain in response to a function, Y (ω) represents the frequency domain transformation of the digital receive signal, and HNL (ω) represents the frequency domain transformation of the nonlinear component of the digital transmit signal.
In particular, the computer program, when executed by the processor 501, may further implement the steps of:
if the signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is smaller than the second threshold value, according to the signal strength ratio
Figure GDA0002790615190000333
Estimating a frequency domain channel response of the self-interference signal; wherein the content of the first and second substances,
Figure GDA0002790615190000334
representing the frequency domain transformation of the nonlinear component of the digital transmit signal in the receive chain in response to a function, Y (ω) representing the frequency domain transformation of the digital receive signal, HNL (ω) representing the frequency domain transformation of the nonlinear component of the digital transmit signal;
if the signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is greater than or equal to the second threshold and less than the first threshold, according to
Figure GDA0002790615190000335
Estimating channel response of the self-interference signal by N subcarriers jointly; wherein the content of the first and second substances,
Figure GDA0002790615190000336
frequency domain transformation, Y (omega), representing the response function of the nonlinear component of a digital transmitted signal on sub-carriers 1 to N in the receiving chainn) Representing the frequency domain transform of the digital received signal on subcarrier n, HNL (omega)n) Representing on subcarrier nFrequency domain transformation of the nonlinear components of the digital transmit signal.
Wherein the value of N is proportional to the signal strength ratio.
In particular, when the self-interference signal is a second harmonic signal, the computer program, when executed by the processor 501, may further implement the steps of: according to hm (t) ═ x2(t) calculating a squared signal of the digital transmission signal transmitted by the transmission link;
according to
Figure GDA0002790615190000341
Determining a frequency domain response of the squared signal in the receive chain;
where HM (t) represents the squared signal of the digital transmission signal, X (t) represents the digital transmission signal, HM (ω) represents the frequency domain transform of the squared signal, and X (ω) represents the frequency domain transform of the digital transmission signal.
In particular, the computer program, when executed by the processor 501, may further implement the steps of: and constructing a nonlinear interference signal of the transmitting link to the receiving link according to the channel response and the square signal of the digital transmitting signal.
In particular, the computer program, when executed by the processor 501, may further implement the steps of:
constructing a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain according to the frequency domain channel response and the frequency domain transformation of the square signal of the digital transmitting signal; and/or the presence of a gas in the gas,
and constructing a nonlinear interference signal of the transmitting link to the receiving link in the time domain according to the time domain channel response and the square signal of the digital transmitting signal.
In particular, the computer program, when executed by the processor 501, may further implement the steps of:
according to
Figure GDA0002790615190000342
Constructing a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain;
wherein the content of the first and second substances,
Figure GDA0002790615190000343
representing a non-linear interfering signal in the frequency domain,
Figure GDA0002790615190000344
represents the frequency domain transform of the response function of the squared signal in the receive chain, and X (ω) represents the frequency domain transform of the digital transmit signal.
In particular, the computer program, when invoked by the processor 44, is operable to perform:
according to the frequency domain channel response, converting to obtain a time domain channel response;
according to
Figure GDA0002790615190000345
Constructing a nonlinear interference signal of a transmitting link to a receiving link on a time domain;
wherein the content of the first and second substances,
Figure GDA0002790615190000346
representing a non-linear interfering signal in the time domain,
Figure GDA0002790615190000347
represents the time domain transformation of the response function of the squared signal in the receive chain, and x (t) represents the digital transmit signal.
In particular, when the self-interference signal is an inter-modulation signal, the computer program, when invoked by the processor 44, is operable to perform:
acquiring a product signal of a first digital transmission signal and a second digital transmission signal transmitted by a transmission link according to hi (t), x1(t) x2 (t);
according to
Figure GDA0002790615190000351
Determining a frequency domain response of the product signal in the receive chain;
where HI (t) represents a product signal of the first digital transmission signal and the second digital transmission signal, X1(t) represents the first digital transmission signal transmitted by the transmit chain, X2(t) represents the second digital transmission signal transmitted by the transmit chain, HI (ω) represents a frequency domain transform of a response function of the intermodulation signal in the receive chain, X1(ω) represents a frequency domain transform of the first digital transmission signal, and X2(ω) represents a frequency domain transform of the second digital transmission signal.
In particular, the computer program, when executed by the processor 501, may further implement the steps of: and constructing a nonlinear interference signal of the transmitting link to the receiving link according to a product signal of the channel response and the digital transmission signal.
In particular, the computer program, when executed by the processor 501, may further implement the steps of:
constructing a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain according to the frequency domain transformation of a product signal of the frequency domain channel response and the digital transmitting signal; and/or the presence of a gas in the gas,
and constructing a nonlinear interference signal of the transmitting link to the receiving link in the time domain according to the product signal of the time domain channel response and the digital transmitting signal.
In particular, the computer program, when executed by the processor 501, may further implement the steps of:
according to
Figure GDA0002790615190000352
Constructing a nonlinear interference signal of a transmitting link to a receiving link on a frequency domain;
wherein the content of the first and second substances,
Figure GDA0002790615190000353
representing a non-linear interfering signal in the frequency domain,
Figure GDA0002790615190000354
representing the frequency domain transform of the response function of the multiplied signal in the receiving chain, X1(ω) representing the frequency domain transform of the first digital transmitted signal, and X2(ω) representing the frequency domain transform of the second digital transmitted signal.
In particular, the computer program, when executed by the processor 501, may further implement the steps of: according to the frequency domain channel response, converting to obtain a time domain channel response;
according to
Figure GDA0002790615190000361
Constructing a nonlinear interference signal of a transmitting link to a receiving link on a time domain;
wherein the content of the first and second substances,
Figure GDA0002790615190000362
representing a non-linear interfering signal in the time domain,
Figure GDA0002790615190000363
representing the time domain transformation of the response function of the product signal in the receive chain, x1(t) representing the first digital transmit signal transmitted by the transmit chain, and x2(t) representing the second digital transmit signal transmitted by the transmit chain.
In particular, the computer program, when executed by the processor 501, may further implement the steps of:
when the timing advance of the transmitting link and the receiving link is greater than a preset threshold value, filtering out a nonlinear interference signal in the receiving link in a time domain;
and when the timing advance is less than or equal to a preset threshold value, filtering out the nonlinear interference signal in the receiving link in the frequency domain.
In particular, the computer program, when executed by the processor 501, may further implement the steps of:
according to
Figure GDA0002790615190000364
Filtering out nonlinear interference signals in a receiving link;
wherein the content of the first and second substances,
Figure GDA0002790615190000365
representing a desired signal in the digital receive signal, y (t) representing the digital receive signal received by the receive chain,
Figure GDA0002790615190000366
representing non-linear interference signals of the transmit chain to the receive chain in the time domain, 2TAIndicating the timing advance of the transmit chain and the receive chain.
In particular, the computer program, when executed by the processor 501, may further implement the steps of: according to
Figure GDA0002790615190000367
Filtering out nonlinear interference signals on a frequency domain in a receiving link;
wherein the content of the first and second substances,
Figure GDA0002790615190000368
representing a frequency domain transform of a desired signal in the digital received signal, Y (ω) representing a frequency domain transform of the digital received signal received by the receive chain,
Figure GDA0002790615190000369
representing the frequency domain transformation of the non-linear interfering signal of the transmit chain to the receive chain.
In particular, the computer program, when executed by the processor 501, may further implement the steps of: and constructing nonlinear interference signals of each transmitting link to the receiving link according to at least two digital transmitting signals and digital receiving signals transmitted by at least two transmitting links respectively.
In particular, the computer program, when executed by the processor 501, may further implement the steps of: respectively filtering all nonlinear interference signals in each receiving link; all the nonlinear interference signals are superposed signals of the nonlinear interference signals of the transmitting chains and the receiving chains.
Specifically, the terminal capability information for indicating whether the nonlinear interference signal filtering capability is supported is reported to the network device.
A terminal may be a wireless terminal or a wired terminal, and a wireless terminal may be a device providing voice and/or other service data connectivity to a user, a handheld device having a wireless connection function, or other processing devices connected to a wireless modem. A wireless terminal, which may be a mobile terminal such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal, e.g., a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, may communicate with one or more core networks via a Radio Access Network (RAN), and may exchange language and/or data with the RAN. For example, devices such as Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs) are used. A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), and a User Device or User Equipment (User Equipment), which are not limited herein.
The terminal of the embodiment of the invention estimates the nonlinear interference signal which is transmitted by the transmitting link and is received and interfered by the receiving link according to the digital transmitting signal transmitted by the transmitting link and the digital receiving signal received by the receiving link, and further deletes the nonlinear interference signal in the receiving link, thereby improving the multi-frequency working performance of the transmitting-receiving node and improving the spectrum efficiency of the system.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
Furthermore, it is to be noted that in the device and method of the invention, it is obvious that the individual components or steps can be decomposed and/or recombined. These decompositions and/or recombinations are to be regarded as equivalents of the present invention. Also, the steps of performing the series of processes described above may naturally be performed chronologically in the order described, but need not necessarily be performed chronologically, and some steps may be performed in parallel or independently of each other. It will be understood by those skilled in the art that all or any of the steps or elements of the method and apparatus of the present invention may be implemented in any computing device (including processors, storage media, etc.) or network of computing devices, in hardware, firmware, software, or any combination thereof, which can be implemented by those skilled in the art using their basic programming skills after reading the description of the present invention.
Thus, the objects of the invention may also be achieved by running a program or a set of programs on any computing device. The computing device may be a general purpose device as is well known. The object of the invention is thus also achieved solely by providing a program product comprising program code for implementing the method or the apparatus. That is, such a program product also constitutes the present invention, and a storage medium storing such a program product also constitutes the present invention. It is to be understood that the storage medium may be any known storage medium or any storage medium developed in the future. It is further noted that in the apparatus and method of the present invention, it is apparent that each component or step can be decomposed and/or recombined. These decompositions and/or recombinations are to be regarded as equivalents of the present invention. Also, the steps of executing the series of processes described above may naturally be executed chronologically in the order described, but need not necessarily be executed chronologically. Some steps may be performed in parallel or independently of each other.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

Claims (51)

1. A signal processing method applied to a transceiving node, the transceiving node comprising: the device comprises at least one transmitting link and at least one receiving link, wherein the working frequency points of the transmitting link and the receiving link are different; characterized in that the signal processing method comprises:
acquiring a digital sending signal sent by the sending link and a digital receiving signal received by the receiving link;
constructing a nonlinear interference signal of the transmitting link to the receiving link according to the digital transmitting signal and the digital receiving signal;
filtering the nonlinear interference signal in the receiving link;
the step of constructing a non-linear interference signal of the transmitting link to the receiving link according to the digital transmitting signal and the digital receiving signal includes:
estimating a channel response of a self-interference signal generated by the transmitting link in the receiving link according to the digital transmitting signal and the digital receiving signal;
constructing a nonlinear interference signal of the transmitting link to the receiving link according to the channel response;
the step of estimating a channel response of a self-interference signal generated by the transmission link in the reception link according to the digital transmission signal and the digital reception signal includes:
estimating the frequency domain channel response of a self-interference signal generated by the transmitting link in the receiving link according to the digital transmitting signal and the digital receiving signal;
the step of estimating a frequency domain channel response of a self-interference signal generated by the transmission link in the reception link according to the digital transmission signal and the digital reception signal includes:
estimating a frequency domain channel response of the self-interference signal by dividing a frequency domain transform of the digital receive signal by a frequency domain transform of a non-linear component of a digital transmit signal when the receive link receives only the signal transmitted by the transmit link; the specific formula is as follows:
Figure FDA0002790615180000011
wherein the content of the first and second substances,
Figure FDA0002790615180000012
a frequency domain transform representing a response function of the non-linear component of the digital transmit signal in the receive chain, Y (ω) representing a frequency domain transform of the digital receive signal, HNL (ω) representing a frequency domain transform of the non-linear component of the digital transmit signal;
alternatively, the first and second electrodes may be,
before the step of constructing the non-linear interference signal of the transmitting link to the receiving link according to the digital transmitting signal and the digital receiving signal, the method further includes:
acquiring a useful signal and a self-interference signal in the digital receiving signal;
the step of estimating a frequency domain channel response of a self-interference signal generated by the transmission link in the reception link according to the digital transmission signal and the digital reception signal includes:
if the signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is smaller than a second threshold value, according to the method
Figure FDA0002790615180000021
Estimating a frequency domain channel response of the self-interference signal; wherein the content of the first and second substances,
Figure FDA0002790615180000022
a frequency domain transform representing a response function of the non-linear component of the digital transmit signal in the receive chain, Y (ω) representing a frequency domain transform of the digital receive signal, HNL (ω) representing a frequency domain transform of the non-linear component of the digital transmit signal;
or, if the signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is greater than or equal toThe second threshold value is smaller than the first threshold value according to
Figure FDA0002790615180000023
Figure FDA0002790615180000024
Estimating a channel response of the self-interference signal jointly through N subcarriers; wherein the content of the first and second substances,
Figure FDA0002790615180000025
frequency domain transformation, Y (omega), representing the response function of the non-linear component of the digital transmission signal on sub-carriers 1 to N in the receiving chainn) Representing the frequency domain transform, HNL (omega), of said digital received signal on a subcarrier nn) Representing a frequency domain transformation of a non-linear component of said digital transmission signal on subcarrier n.
2. The signal processing method according to claim 1, wherein before the step of constructing the non-linear interference signal of the transmit chain to the receive chain according to the digital transmit signal and the digital receive signal, the method further comprises:
acquiring a useful signal and a self-interference signal in the digital receiving signal;
and if the signal strength ratio of the signal strength of the useful signal in the digital receiving signal to the signal strength of the self-interference signal is greater than or equal to a first threshold, not executing the steps of constructing and filtering the non-linear interference signal.
3. The signal processing method according to claim 2, wherein the step of obtaining the desired signal and the self-interference signal in the digital received signal comprises:
when the transmitting link does not transmit signals, useful signals in the digital receiving signals received by the receiving link are obtained;
and when the receiving link only receives the signals sent by the transmitting link, acquiring self-interference signals in the digital receiving signals received by the receiving link.
4. The signal processing method of claim 1, wherein the step of estimating a channel response of the self-interference signal generated by the transmission link in the reception link according to the digital transmission signal and the digital reception signal further comprises:
and estimating the time domain channel response of the self-interference signal generated by the transmitting link in the receiving link according to the digital transmitting signal and the digital receiving signal.
5. The signal processing method of claim 1, wherein the value of N is proportional to the signal strength ratio.
6. The signal processing method according to claim 1, wherein when the self-interference signal is a second harmonic signal, the step of estimating a frequency domain channel response of the self-interference signal generated by the transmitting chain in the receiving chain according to the digital transmitting signal and the digital receiving signal further comprises:
according to hm (t) ═ x2(t) calculating a squared signal of the digital transmission signal transmitted by the transmission link;
according to
Figure FDA0002790615180000031
Determining a frequency domain response of the squared signal in the receive chain;
where HM (t) represents the squared signal of the digital transmit signal, X (t) represents the digital transmit signal, HM (ω) represents the frequency domain transform of the squared signal, and X (ω) represents the frequency domain transform of the digital transmit signal.
7. The signal processing method of claim 6, wherein the step of constructing the non-linear interference signal of the transmitting link to the receiving link according to the channel response comprises:
and constructing a nonlinear interference signal of the transmitting link to the receiving link according to the channel response and a square signal of the digital transmitting signal.
8. The signal processing method of claim 7, wherein the step of constructing the non-linear interference signal of the transmitting chain to the receiving chain according to the channel response and the square signal of the digital transmission signal comprises:
and constructing a nonlinear interference signal of the transmitting link to the receiving link in a frequency domain according to the frequency domain channel response and the frequency domain transformation of the square signal of the digital transmitting signal.
9. The signal processing method according to claim 7 or 8, wherein the step of estimating a channel response of the self-interference signal generated by the transmission link in the reception link according to the digital transmission signal and the digital reception signal further comprises:
estimating a time domain channel response of a self-interference signal generated by the transmitting link in the receiving link according to the digital transmitting signal and the digital receiving signal;
the step of constructing a non-linear interference signal of the transmitting link to the receiving link according to the channel response and the square signal of the digital transmission signal includes:
and constructing a nonlinear interference signal of the transmitting link to the receiving link in the time domain according to the time domain channel response and the square signal of the digital transmitting signal.
10. The signal processing method of claim 8, wherein the step of constructing the non-linear interference signal of the transmitting chain to the receiving chain in the frequency domain according to the frequency domain channel response and the frequency domain transform of the square signal of the digital transmission signal comprises:
according to
Figure FDA0002790615180000041
Constructing a nonlinear interference signal of the transmitting link to the receiving link on a frequency domain;
wherein the content of the first and second substances,
Figure FDA0002790615180000042
representing a non-linear interfering signal in the frequency domain,
Figure FDA0002790615180000043
represents a frequency domain transform of the response function of the squared signal in the receive chain, and X (ω) represents a frequency domain transform of a digital transmit signal.
11. The signal processing method of claim 9, wherein the step of constructing the non-linear interference signal of the transmitting link to the receiving link in the time domain according to the time domain channel response and a square term of a square signal of the digital transmission signal comprises:
according to the frequency domain channel response, converting to obtain a time domain channel response;
according to
Figure FDA0002790615180000051
Constructing a nonlinear interference signal of the transmitting link to the receiving link in a time domain;
wherein the content of the first and second substances,
Figure FDA0002790615180000052
representing a non-linear interfering signal in the time domain,
Figure FDA0002790615180000053
represents a time domain transformation of a response function of said squared signal in said receive chain, and x (t) represents said digital transmit signal.
12. The signal processing method according to claim 1, wherein when the self-interference signal is an inter-modulation signal, the step of estimating a frequency-domain channel response of the self-interference signal generated by the transmitting chain in the receiving chain according to the digital transmitting signal and the digital receiving signal further comprises:
acquiring a product signal of a first digital transmission signal and a second digital transmission signal transmitted by the transmission link according to hi (t) ═ x1(t) · x2 (t);
according to
Figure FDA0002790615180000054
Determining a frequency domain response of said product signal in said receive chain;
where HI (t) represents a product signal of the first digital transmission signal and the second digital transmission signal, X1(t) represents the first digital transmission signal transmitted by the transmit chain, X2(t) represents the second digital transmission signal transmitted by the transmit chain, HI (ω) represents a frequency domain transform of a response function of the intermodulation signals in the receive chain, X1(ω) represents a frequency domain transform of the first digital transmission signal, and X2(ω) represents a frequency domain transform of the second digital transmission signal.
13. The signal processing method of claim 12, wherein the step of constructing the non-linear interference signal of the transmitting link to the receiving link according to the channel response comprises:
and constructing a nonlinear interference signal of the transmitting link to the receiving link according to a product signal of the channel response and the digital transmission signal.
14. The signal processing method of claim 13, wherein the step of constructing the non-linear interference signal of the transmitting link to the receiving link according to the product signal of the channel response and the digital transmission signal comprises:
and constructing a nonlinear interference signal of the transmitting link to the receiving link in a frequency domain according to the frequency domain channel response and the frequency domain transformation of the product signal of the digital transmitting signal.
15. The signal processing method according to claim 13 or 14, wherein the step of estimating a channel response of the self-interference signal generated by the transmission link in the reception link according to the digital transmission signal and the digital reception signal further comprises:
estimating a time domain channel response of a self-interference signal generated by the transmitting link in the receiving link according to the digital transmitting signal and the digital receiving signal;
the step of constructing a non-linear interference signal of the transmitting link to the receiving link according to a product signal of the channel response and the digital transmission signal includes:
and constructing a nonlinear interference signal of the transmitting link to the receiving link in the time domain according to the product signal of the time domain channel response and the digital transmitting signal.
16. The signal processing method of claim 14, wherein the step of constructing the non-linear interference signal of the transmitting chain to the receiving chain in the frequency domain according to the frequency domain transformation of the product signal of the frequency domain channel response and the digital transmission signal comprises:
according to
Figure FDA0002790615180000061
Constructing a nonlinear interference signal of the transmitting link to the receiving link on a frequency domain;
wherein the content of the first and second substances,
Figure FDA0002790615180000062
representing a non-linear interfering signal in the frequency domain,
Figure FDA0002790615180000063
representing a frequency domain transformation of a response function of said product signal in said receiving chain, X1(ω) representing said first numberA frequency domain transform of the digital transmitted signal, X2(ω) representing the frequency domain transform of the second digital transmitted signal.
17. The signal processing method of claim 15, wherein the step of constructing a non-linear interference signal of the transmit chain to the receive chain in the time domain according to a product signal of the time domain channel response and the digital transmission signal comprises:
according to the frequency domain channel response, converting to obtain a time domain channel response;
according to
Figure FDA0002790615180000064
Constructing a nonlinear interference signal of the transmitting link to the receiving link in a time domain;
wherein the content of the first and second substances,
Figure FDA0002790615180000065
representing a non-linear interfering signal in the time domain,
Figure FDA0002790615180000066
represents the time domain response function of the product signal at the receiving chain, x1(t) represents the first digital transmission signal transmitted by the transmitting chain, and x2(t) represents the second digital transmission signal transmitted by the transmitting chain.
18. The signal processing method of claim 4, wherein the step of filtering the nonlinear interference signal in the receiving chain comprises:
when the timing advance of the transmitting link and the receiving link is larger than a preset threshold value, filtering out a nonlinear interference signal in the receiving link in a time domain;
and when the timing advance is smaller than or equal to the preset threshold value, filtering out the nonlinear interference signal in the receiving link in a frequency domain.
19. The signal processing method of claim 18, wherein the step of filtering the non-linear interference signal in the receiving link in the time domain comprises:
according to
Figure FDA0002790615180000071
Filtering out nonlinear interference signals in the receiving link;
wherein the content of the first and second substances,
Figure FDA0002790615180000072
representing a desired signal in said digital receive signal, y (t) representing a digital receive signal received by said receive chain,
Figure FDA0002790615180000073
representing non-linear interfering signals of said transmitting chain to said receiving chain in time domain, 2TARepresents a timing advance of the transmit chain and the receive chain.
20. The signal processing method of claim 18, wherein the step of filtering the non-linear interference signal in the receiving chain in the frequency domain comprises:
according to
Figure FDA0002790615180000074
Filtering out nonlinear interference signals on a frequency domain in the receiving link;
wherein the content of the first and second substances,
Figure FDA0002790615180000075
representing a frequency domain transform of a desired signal in the digital receive signal, Y (ω) representing a frequency domain transform of the digital receive signal received by the receive chain,
Figure FDA0002790615180000076
representing a frequency domain transformation of the non-linear interfering signal of the transmit chain to the receive chain.
21. The signal processing method according to claim 1, wherein when the transceiver node includes at least two transmission links, the step of constructing a non-linear interference signal of the transmission link to the reception link according to the digital transmission signal and the digital reception signal comprises:
and constructing the nonlinear interference signal of each transmitting link to the receiving link according to at least two digital transmitting signals and digital receiving signals transmitted by the at least two transmitting links respectively.
22. The signal processing method of claim 21, wherein the step of filtering the non-linear interference signal in the receiving link comprises:
respectively filtering all nonlinear interference signals in each receiving link; and all the nonlinear interference signals are superposed signals of the nonlinear interference signals of the receiving link by each transmitting link.
23. The signal processing method according to claim 1, wherein when the transceiver node is a terminal, the step of filtering out the non-linear interference signal in the receiving link further comprises:
and reporting terminal capability information for indicating whether the nonlinear interference signal filtering capability is supported or not to the network equipment.
24. The signal processing method according to claim 1, wherein when the transceiver node is a network device, before the step of filtering out the nonlinear interference signal in the receiving link, the method further comprises:
and receiving terminal capability information which is reported by the terminal and used for indicating whether the nonlinear interference signal filtering capability is supported.
25. A transceiving node, the transceiving node comprising: the device comprises at least one transmitting link and at least one receiving link, wherein the working frequency points of the transmitting link and the receiving link are different; characterized in that said transceiving node further comprises:
a first obtaining module, configured to obtain a digital sending signal sent by the sending link and a digital receiving signal received by the receiving link;
the building module is used for building a nonlinear interference signal of the transmitting link to the receiving link according to the digital transmitting signal and the digital receiving signal;
a filtering module, configured to filter the nonlinear interference signal in the receiving link;
the building module comprises:
the estimation sub-module is used for estimating the channel response of a self-interference signal generated by the transmitting link in the receiving link according to the digital transmitting signal and the digital receiving signal;
the constructing submodule is used for constructing a nonlinear interference signal of the transmitting link to the receiving link according to the channel response;
the estimation sub-module includes:
a first estimating unit, configured to estimate, according to the digital transmit signal and the digital receive signal, a frequency domain channel response of a self-interference signal generated by the transmit link in the receive link;
the first estimation unit includes:
a first estimating subunit, configured to estimate a frequency domain channel response of the self-interference signal by dividing a frequency domain transform of the digital received signal by a frequency domain transform of a non-linear component of a digital transmitted signal when the receiving link receives only a signal transmitted by the transmitting link; the specific formula is as follows:
Figure FDA0002790615180000081
wherein the content of the first and second substances,
Figure FDA0002790615180000082
a frequency domain transform representing a response function of the non-linear component of the digital transmit signal in the receive chain, Y (ω) representing a frequency domain transform of the digital receive signal, HNL (ω) representing a frequency domain transform of the non-linear component of the digital transmit signal;
alternatively, the first and second electrodes may be,
the transceiving node further comprises:
the second acquisition module is used for acquiring a useful signal and a self-interference signal in the digital receiving signal;
the first estimation unit includes:
a second estimating subunit, configured to, if a signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is smaller than a second threshold value, determine according to
Figure FDA0002790615180000091
Estimating a frequency domain channel response of the self-interference signal; wherein the content of the first and second substances,
Figure FDA0002790615180000092
a frequency domain transform representing a response function of the non-linear component of the digital transmit signal in the receive chain, Y (ω) representing a frequency domain transform of the digital receive signal, HNL (ω) representing a frequency domain transform of the non-linear component of the digital transmit signal;
or, the first estimating unit includes:
a third estimating subunit, configured to, if a signal strength ratio of the signal strength of the useful signal to the signal strength of the self-interference signal is greater than or equal to the second threshold and smaller than the first threshold, according to
Figure FDA0002790615180000093
Estimating a channel response of the self-interference signal jointly through N subcarriers; wherein the content of the first and second substances,
Figure FDA0002790615180000094
representing said digital transmission signalIs responsive to a frequency domain transformation of the function on sub-carriers 1 to N in said receiving chain, Y (ω)n) Representing the frequency domain transform, HNL (omega), of said digital received signal on a subcarrier nn) Representing a frequency domain transformation of a non-linear component of said digital transmission signal on subcarrier n.
26. The transceiving node of claim 25, further comprising:
the second acquisition module is used for acquiring a useful signal and a self-interference signal in the digital receiving signal;
and the processing module is used for not executing the steps of constructing and filtering the nonlinear interference signal if the signal strength ratio of the signal strength of the useful signal in the digital receiving signal to the signal strength of the self-interference signal is greater than or equal to a first threshold value.
27. The transceiving node of claim 26, wherein the second acquisition module comprises:
the first acquisition submodule is used for acquiring a useful signal in a digital receiving signal received by the receiving link when the transmitting link does not send the signal;
and the second obtaining sub-module is configured to obtain a self-interference signal in the digital receiving signal received by the receiving link when the receiving link only receives the signal sent by the transmitting link.
28. The transceiving node of claim 25, wherein the estimation sub-module further comprises:
and the second estimation unit is used for estimating the time domain channel response of the self-interference signal generated by the transmitting link in the receiving link according to the digital transmitting signal and the digital receiving signal.
29. The transceiving node of claim 25, wherein the value of N is proportional to the signal strength ratio.
30. The transceiving node of claim 25, wherein when the self-interference signal is a second harmonic signal, the first estimation unit further comprises:
a first obtaining subunit, configured to obtain x according to hm (t) ═ x2(t) calculating a squared signal of the digital transmission signal transmitted by the transmission link;
a first determining subunit for determining based on
Figure FDA0002790615180000101
Determining a frequency domain response of the squared signal in the receive chain;
where HM (t) represents the squared signal of the digital transmit signal, X (t) represents the digital transmit signal, HM (ω) represents the frequency domain transform of the squared signal, and X (ω) represents the frequency domain transform of the digital transmit signal.
31. The transceiving node of claim 30, wherein the building submodule comprises:
and the first construction unit is used for constructing a nonlinear interference signal of the transmitting link to the receiving link according to the channel response and a square signal of the digital transmission signal.
32. The transceiving node of claim 31, wherein the first building unit comprises:
and the first constructing subunit is used for constructing a nonlinear interference signal of the transmitting link to the receiving link in a frequency domain according to the frequency domain channel response and the frequency domain transformation of the square signal of the digital transmitting signal.
33. The transceiving node of claim 31 or 32,
the estimation sub-module further includes:
a second estimating unit, configured to estimate, according to the digital transmit signal and the digital receive signal, a time-domain channel response of a self-interference signal generated by the transmit link in the receive link;
the first building element comprising:
and the second constructing subunit is used for constructing a nonlinear interference signal of the transmitting link to the receiving link in the time domain according to the time domain channel response and the square signal of the digital transmitting signal.
34. The transceiving node of claim 32, wherein the first building subunit is specifically configured to:
according to
Figure FDA0002790615180000111
Constructing a nonlinear interference signal of the transmitting link to the receiving link on a frequency domain;
wherein the content of the first and second substances,
Figure FDA0002790615180000112
representing a non-linear interfering signal in the frequency domain,
Figure FDA0002790615180000113
represents a frequency domain transform of the response function of the squared signal in the receive chain, and X (ω) represents a frequency domain transform of a digital transmit signal.
35. The transceiving node of claim 33, wherein the second building subunit is specifically configured to:
according to the frequency domain channel response, converting to obtain a time domain channel response;
according to
Figure FDA0002790615180000114
Constructing a nonlinear interference signal of the transmitting link to the receiving link in a time domain;
wherein the content of the first and second substances,
Figure FDA0002790615180000115
representing a non-linear interfering signal in the time domain,
Figure FDA0002790615180000116
represents a time domain transformation of a response function of said squared signal in said receive chain, and x (t) represents said digital transmit signal.
36. The transceiving node of claim 25, wherein when the self-interference signal is an inter-modulation signal, the first estimating unit further comprises:
a second obtaining subunit, configured to obtain a product signal of the first digital transmission signal and the second digital transmission signal transmitted by the transmission link according to hi (t) ═ x1(t) · x2 (t);
a second determining subunit for determining based on
Figure FDA0002790615180000117
Determining a frequency domain response of said product signal in said receive chain;
where HI (t) represents a product signal of the first digital transmission signal and the second digital transmission signal, X1(t) represents the first digital transmission signal transmitted by the transmit chain, X2(t) represents the second digital transmission signal transmitted by the transmit chain, HI (ω) represents a frequency domain transform of a response function of the intermodulation signals in the receive chain, X1(ω) represents a frequency domain transform of the first digital transmission signal, and X2(ω) represents a frequency domain transform of the first digital transmission signal.
37. The transceiving node of claim 36, wherein the building submodule comprises:
and the second construction unit is used for constructing the nonlinear interference signal of the transmitting link to the receiving link according to the product signal of the channel response and the digital transmission signal.
38. The transceiving node of claim 37, wherein the second building unit comprises:
and the third constructing subunit is used for constructing the nonlinear interference signal of the transmitting link to the receiving link in the frequency domain according to the frequency domain channel response and the frequency domain transformation of the product signal of the digital transmitting signal.
39. The transceiving node of claim 37 or 38,
the estimation sub-module further includes:
a second estimating unit, configured to estimate, according to the digital transmit signal and the digital receive signal, a time-domain channel response of a self-interference signal generated by the transmit link in the receive link;
the second building element comprises:
and the fourth constructing subunit is configured to construct, according to a product signal of the time domain channel response and the digital transmission signal, a nonlinear interference signal of the transmission link to the reception link in the time domain.
40. The transceiving node of claim 38, wherein the third building subunit is specifically configured to:
according to
Figure FDA0002790615180000121
Constructing a nonlinear interference signal of the transmitting link to the receiving link on a frequency domain;
wherein the content of the first and second substances,
Figure FDA0002790615180000122
representing a non-linear interfering signal in the frequency domain,
Figure FDA0002790615180000123
represents a frequency domain transform of a response function of the product signal in the receive chain, X1(ω) represents a frequency domain transform of the first digital transmit signal, and X2(ω) represents a frequency domain transform of the second digital transmit signal.
41. The transceiving node of claim 39, wherein the fourth building subunit is specifically configured to:
according to the frequency domain channel response, converting to obtain a time domain channel response;
according to
Figure FDA0002790615180000131
Constructing a nonlinear interference signal of the transmitting link to the receiving link in a time domain;
wherein the content of the first and second substances,
Figure FDA0002790615180000132
representing a non-linear interfering signal in the time domain,
Figure FDA0002790615180000133
represents the time domain response function of the product signal at the receiving chain, x1(t) represents the first digital transmission signal transmitted by the transmitting chain, and x2(t) represents the second digital transmission signal transmitted by the transmitting chain.
42. The transceiver node of claim 28, wherein the filtering module comprises:
the first filtering submodule is used for filtering the nonlinear interference signal in the receiving link in a time domain when the timing advance of the transmitting link and the receiving link is greater than a preset threshold value;
and the second filtering submodule is used for filtering the nonlinear interference signal in the receiving link in a frequency domain when the timing advance is less than or equal to the preset threshold value.
43. The transceiving node of claim 42, wherein the first filtering sub-module comprises:
a first filtering unit for filtering the first and second signals
Figure FDA0002790615180000134
Filtering out nonlinear interference signals in the receiving link;
wherein the content of the first and second substances,
Figure FDA0002790615180000135
representing a desired signal in said digital receive signal, y (t) representing a digital receive signal received by said receive chain,
Figure FDA0002790615180000136
representing non-linear interfering signals of said transmitting chain to said receiving chain in time domain, 2TARepresents a timing advance of the transmit chain and the receive chain.
44. The transceiver node of claim 42, wherein the second filtering submodule comprises:
a second filtering unit for filtering the first and second signals
Figure FDA0002790615180000137
Filtering out nonlinear interference signals on a frequency domain in the receiving link;
wherein the content of the first and second substances,
Figure FDA0002790615180000138
representing a frequency domain transform of a desired signal in the digital receive signal, Y (ω) representing a frequency domain transform of the digital receive signal received by the receive chain,
Figure FDA0002790615180000139
representing a frequency domain transformation of the non-linear interfering signal of the transmit chain to the receive chain.
45. The transceiving node of claim 25, wherein when the transceiving node comprises at least two transmit chains, the building module is specifically configured to:
and constructing the nonlinear interference signal of each transmitting link to the receiving link according to at least two digital transmitting signals and digital receiving signals transmitted by the at least two transmitting links respectively.
46. The transceiving node of claim 45, wherein the filtering module is specifically configured to:
respectively filtering all nonlinear interference signals in each receiving link; and all the nonlinear interference signals are superposed signals of the nonlinear interference signals of the receiving link by each transmitting link.
47. The transceiving node of claim 25, wherein when the transceiving node is a terminal, the transceiving node further comprises:
and the reporting module is used for reporting the terminal capability information used for indicating whether the nonlinear interference signal filtering capability is supported or not to the network equipment.
48. The transceiving node of claim 25, wherein when the transceiving node is a network device, the transceiving node further comprises:
and the receiving module is used for receiving the terminal capability information which is reported by the terminal and used for indicating whether the nonlinear interference signal filtering capability is supported.
49. A network device comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the signal processing method according to any one of claims 1 to 22 or 24 when executing the computer program.
50. A communication terminal, characterized in that the terminal comprises a processor, a memory and a computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the signal processing method according to any one of claims 1 to 23.
51. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the signal processing method according to any one of claims 1 to 24.
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