WO2017054153A1 - Method and device for cancelling non-linear interference - Google Patents

Method and device for cancelling non-linear interference Download PDF

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Publication number
WO2017054153A1
WO2017054153A1 PCT/CN2015/091172 CN2015091172W WO2017054153A1 WO 2017054153 A1 WO2017054153 A1 WO 2017054153A1 CN 2015091172 W CN2015091172 W CN 2015091172W WO 2017054153 A1 WO2017054153 A1 WO 2017054153A1
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signal
local
radio frequency
transmitting
power
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PCT/CN2015/091172
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French (fr)
Chinese (zh)
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曹萍
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华为技术有限公司
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Priority to PCT/CN2015/091172 priority Critical patent/WO2017054153A1/en
Priority to CN201580083534.8A priority patent/CN108141243B/en
Publication of WO2017054153A1 publication Critical patent/WO2017054153A1/en

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    • 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

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  • Embodiments of the present invention relate to the field of communications, and in particular, to a method and apparatus for canceling nonlinear interference.
  • microwave backhaul needs to be continuously increased to meet the high-speed growth of wireless network bandwidth. Due to the limited spectrum resources of the microwave, the way to improve the frequency utilization is particularly important.
  • Time Division Duplex refers to the technology of transmitting and receiving transmissions in different time slots but at the same frequency.
  • Frequency division duplexing refers to the technique of transmitting and receiving at different frequencies but transmitting at the same time.
  • Co-frequency full-duplex is a technique of bidirectional transmission at the same frequency at the same time, which can double the air interface rate compared to the existing communication method.
  • Time division duplexing and frequency division duplexing perform signal transmission in different time slots and different frequencies respectively, so the interference between the transmitting and receiving signals is small, and the system is simple to implement.
  • the biggest problem faced by the same-frequency full-duplex is the same-frequency interference.
  • the receiver needs to suppress the same-channel interference at the local end to demodulate the useful signal at the opposite end and perform effective signal transmission.
  • nonlinear interference In order to suppress the influence of the same-frequency interference at the local end, nonlinear interference is a very important consideration.
  • pre-distortion is usually performed at the transmitting portion of the local end to improve the linearity of the interference signal, and such suppression method is not flexible enough.
  • the embodiment of the invention provides a method and a device for canceling non-linear interference, which are used to solve the problem of suppressing inflexibility of the same-frequency interference at the local end in the prior art.
  • a method for canceling nonlinear interference including: acquiring a local radio frequency transmission
  • the nonlinear distortion index of the signal is calculated according to the nonlinear distortion index of the local transmitting signal, and the out-of-band distortion power of the received RF signal is calculated, and it is determined whether the out-of-band distortion power of the local receiving signal is greater than the first threshold, and the calculation is performed.
  • the nonlinear relationship of the local transmitting channel is reconstructed according to the nonlinear relationship of the transmitting channel of the local end, and the interference digital signal is reconstructed to obtain an interference cancellation signal. If it is determined that the out-of-band distortion power of the local receiving signal is greater than the first threshold, The digital interference cancellation is performed on the local receiving digital baseband signal by using the interference cancellation signal.
  • the acquiring a nonlinear distortion indicator of the local radio frequency transmitting signal includes: acquiring a third-order intermodulation (IM3) of the local radio frequency transmitting signal; or Obtain the adjacent channel leakage ratio (ACLR) of the local RF transmission signal.
  • IM3 third-order intermodulation
  • ACLR adjacent channel leakage ratio
  • the acquiring the IM3 of the local radio frequency transmitting signal includes calculating the IM3 of the local radio frequency transmitting signal by using the following formula : Wherein the total present OIP3 total output IIP3 nonlinear device transmit power P TX channel radio frequency transmit signal present terminal end.
  • the calculating a nonlinear relationship of the local transmit channel includes: The input signal of the amplifier of the end transmitting channel and the output signal of the amplifier of the local transmitting channel calculate the nonlinear relationship of the transmitting channel of the local end.
  • the calculating, according to the nonlinear distortion index of the local transmit signal includes: obtaining the self-interference power of the radio frequency signal received by the local end, and calculating the local receiving radio frequency according to the nonlinear distortion index of the local end transmitting signal and the self-interference power of the local receiving radio frequency signal. Out-of-band distortion power of the signal.
  • a non-linear interference cancellation device including: an acquisition unit, configured to acquire a nonlinear distortion indicator of a local radio frequency transmission signal, and calculate a local reception radio frequency according to the nonlinear distortion index of the local end transmission signal.
  • the out-of-band distortion power of the signal is configured to determine whether the out-of-band distortion power of the local receiving signal is greater than a first threshold; and the constructing unit is configured to calculate a nonlinear relationship of the local transmitting channel, according to the local transmitting channel The non-linear relationship reconstructs the digital baseband signal transmitted by the local end to obtain an interference cancellation signal; and the canceling unit is configured to: if the determining unit determines that the out-of-band distortion power of the local receiving signal is greater than the first threshold, the interference cancellation signal is used to receive the local end Digital baseband signals are digitally offset.
  • the acquiring unit specifically acquires a third-order intermodulation (IM3) of the local radio frequency transmitting signal; or the acquiring unit specifically acquires the adjacent end of the local radio frequency transmitting signal.
  • IM3 third-order intermodulation
  • ACLR Channel Leakage Ratio
  • the acquiring unit is configured to calculate the IM3 of the local radio frequency transmitting signal by using the following formula: Wherein the total present OIP3 total output IIP3 nonlinear device transmit power P TX channel radio frequency transmit signal present terminal end.
  • the constructing unit is specifically configured according to an input signal of an amplifier of the local transmitting channel And the output signal of the amplifier of the local transmitting channel calculates the nonlinear relationship of the local transmitting channel.
  • the acquiring unit is configured to obtain the self-interference power of the local end receiving the radio frequency signal And calculating an out-of-band distortion power of the local terminal receiving the radio frequency signal according to the nonlinear distortion index of the local transmitting signal and the self-interference power of the local receiving radio frequency signal.
  • the nonlinear distortion index of the local radio frequency transmission signal is obtained, and the out-of-band distortion power of the local end receiving radio frequency signal is calculated according to the nonlinear distortion index of the local end transmitting signal, and the local end receiving signal is determined.
  • the out-of-band distortion power is greater than the first threshold, and when determining that the out-of-band distortion power of the local receiving signal is greater than the first threshold, reconstructing the digital baseband signal of the local end according to the nonlinear relationship of the local transmitting channel, and obtaining interference cancellation
  • the signal uses the interference cancellation signal to perform digital interference cancellation on the local receiving digital baseband signal, so that the receiving signal can be flexibly
  • the nonlinear elimination of the number effectively suppresses the influence of the same-frequency interference at the local end.
  • FIG. 1 is a structural diagram of a co-frequency full duplex communication system according to an embodiment of the present invention.
  • FIG. 2 is a structural diagram of a co-frequency full-duplex device according to an embodiment of the present invention.
  • FIG. 3 is a flow chart of a method for canceling nonlinear interference according to an embodiment of the present invention.
  • FIG. 4 is a structural diagram of self-interference power for acquiring a radio frequency signal received by a local end according to an embodiment of the present invention.
  • FIG. 5 is a structural diagram of a nonlinear interference canceling apparatus according to an embodiment of the present invention.
  • Site A (the local end) and the site B (the opposite end) are a pair of microwave devices that communicate with each other.
  • the local end and the opposite end are only relative concepts.
  • the system transmits and receives signals at the same time and the same frequency.
  • the local end not only receives the useful signal S transmitted by the opposite end, but also receives the self-interference signal I transmitted by the local end, that is, when the local end and the opposite end simultaneously transmit signals,
  • the total signal received by the terminal is S+I.
  • FIG. 2 is a structural diagram of a co-frequency full-duplex device according to an embodiment of the present invention, which may be, for example, the site A in FIG.
  • the same-frequency full-duplex device in Figure 2 is mainly divided into upper and lower parts, with the above emission Channel, below is the receiving channel, and the middle is the nonlinear interference cancellation part.
  • the baseband 101 is used for transmitting the digital baseband signal
  • the digital-to-analog converter 102 converts the digital signal into an analog signal
  • the intermediate frequency 103 includes functions of up-conversion, filtering, and amplification of the intermediate frequency signal
  • the radio frequency 104 includes the radio frequency signal.
  • the power amplifier 105 is used to amplify the power signal of the transmitting end, and the transmitting antenna transmits the radio frequency signal to the spatial channel; in the signal receiving channel, the receiving antenna receives the signal from the spatial channel, and the receiving signal includes not only the pair
  • the useful signal sent by the terminal further includes an interference signal sent by the local end
  • the low noise amplifier 111 amplifies the received power signal
  • the radio frequency 112 includes functions of down-conversion, filtering, and amplification of the radio frequency signal
  • the intermediate frequency 113 includes down-conversion of the intermediate frequency signal
  • the analog to digital converter 114 converts the analog signal into a digital signal
  • the baseband 115 includes a digital signal receiving process.
  • the intermediate nonlinear interference cancellation portion is used to cancel the received interference signal at the digital end, including the acquisition unit 121, the determination unit 122, the construction unit 123, and the cancellation unit 124.
  • FIG. 3 is a flowchart of a method for canceling nonlinear interference according to an embodiment of the present invention, including:
  • S301 Acquire a nonlinear distortion indicator of the local radio frequency transmission signal, and calculate an out-of-band distortion power of the local end receiving radio frequency signal according to the nonlinear distortion index of the local end transmission signal.
  • the local radio frequency transmission signal may be the signal after the power amplifier 105 in FIG. 2, that is, the transmission signal processed by the power amplifier 105, and the local end receiving radio frequency signal may be the signal before the low noise amplifier 111, that is, not The received signal processed by the low noise amplifier 111.
  • a corresponding signal can be obtained by coupling a portion of the power in the signal path. If the peer end is not enabled, the local end receiving the radio frequency signal includes the self-interference signal I transmitted by the local end, and does not include the useful signal S transmitted by the opposite end; if the opposite end is turned on, the local end receives the radio frequency signal including the self-interference transmitted by the local end.
  • Signal I also includes a useful signal S transmitted by the opposite end.
  • the nonlinear distortion index of the local RF transmission signal wherein the nonlinear distortion index can be third-order intermodulation (IM3), adjacent channel leakage ratio (ACLR), etc., where IM3 is the third-order intermodulation power and The difference between the useful signal power, ACLR is the difference between the adjacent channel leakage power of the output signal and the main channel carrier power. If the units used by IM3 and ACLR are different, IM3 and ACLR can be phase. The ratio of the power should be.
  • the nonlinear component of the transmitted signal can be calculated by the current transmitted signal power, or can be obtained by obtaining the current nonlinear characteristics of the transmitting end. The following three methods are taken as an example for brief description.
  • the total output third-order intercept point OIP3 always outputs the third-order intercept point cascading value of the transmitting device. If the devices 1 and 2 are cascaded, the total output third-order intercept point after cascading Where G2 is the gain of the device 2, and OIP3 is the third-order intermodulation parameter of each device.
  • the nonlinear characteristics of the transmitting end are mainly caused by PA, so it is necessary to obtain nonlinear characteristics at the back end of the PA.
  • the nonlinear distortion index ACLR of the transmitted signal can also be obtained by the nonlinear characteristic of the transmitting end.
  • the nonlinear characteristics of the transmitting end are mainly caused by PA, so it is necessary to obtain nonlinear characteristics at the back end of the PA.
  • the following describes how to calculate the out-of-band distortion power of the receiving RF signal according to the nonlinear distortion index of the local transmitting signal.
  • the local end transmitting signal is turned on, the local end signal is sent from the antenna end.
  • Turning off the peer transmit signal can be achieved by turning off the power of the peer transmitter or not sending data, for example, setting it to a silent state.
  • the local end transmitting signal is turned on, the local end signal is sent from the antenna end.
  • the opposite end transmitting signal is turned on, so that the opposite end signal is sent from the antenna end.
  • the local terminal receiving radio frequency signal power P RX always includes the total power of the local self-interference signal I and the opposite end useful signal S, and can be regarded as the useful signal S and the self-interference signal I power ratio SIR and the receiver detected at the digital end.
  • the SIR values detected by the front end are the same.
  • the local transmitting signal reaches the receiving end through the spatial channel, and the nonlinear distortion index of the receiving end is equal to the nonlinear distortion index of the transmitting end, and the local end receives the nonlinear distortion component of the transmitting signal of the local end.
  • the self-interference power P RX- I of the local end receiving radio frequency signal can be obtained by the following method.
  • FIG. 4 a self-interference power structure diagram for acquiring a radio frequency signal received by a local end according to an embodiment of the present invention is provided.
  • the total signal received at the digital end is S+I, and the equalizer c1 is used to obtain S*c1. +I*c1, self-interference signal generated by the digital terminal After the equalizer c2, get The two signals are combined to finally output a useful signal.
  • the equalizer converges, it is considered with
  • the digital terminal can obtain the ratio of the useful signal S to the interference signal I After obtaining the total SIR value and P RX, can be calculated
  • the first threshold can be the receiver back-end noise power plus a margin Margin, ie using the following formula:
  • BW is the signal bandwidth (in Hz)
  • NF is the receiving noise coefficient of the local end
  • the nonlinearity of the transmitting end is mainly caused by the power amplifier 105, and the nonlinear relationship of the power amplifier 105 can be equivalent to the nonlinear relationship of the transmitting end.
  • the nonlinearity of the power amplifier 105 can be obtained. relationship.
  • the envelope signals at the input and output of the power amplifier 105 the input signal and the output signal of the power amplifier 105 can be obtained.
  • the envelope signal can be obtained by a dedicated chip, and then the analog envelope signal is converted into a digital signal through an analog-to-digital converter.
  • the signal is such that the input baseband data Si of the power amplifier 105 and the output baseband data So are obtained.
  • the input baseband data and the output baseband data of the power amplifier 105 can also be obtained by downconverting the input signal and the output signal of the power amplifier 105 into a low frequency signal and then converting the low frequency signal into a digital signal through an analog to digital converter.
  • the nonlinear characteristic of the baseband signal is modeled. Before the modeling, the input signal and the output signal of the power amplifier 105 can be time-aligned to obtain the aligned input signal S i * and the output signal S o * , respectively .
  • This memoryless polynomial model is the nonlinear relationship of the local transmit channel.
  • the digital baseband signal transmitted at the local end is reconstructed to obtain an interference cancellation signal.
  • the interference cancellation signal is used to perform digital interference cancellation on the local receiving digital baseband signal.
  • step S303 may be started only when it is determined that the out-of-band distortion power of the local receiving signal is greater than the first threshold, or may be started in advance, and used directly when needed.
  • the interference cancellation signal Before using the interference cancellation signal to digitally cancel the digital baseband signal received by the local end, the interference cancellation signal can be subjected to operations including channel estimation, signal synchronization, and phase noise suppression.
  • the channel estimation can compensate for device unevenness and spatial multipath channel.
  • the multipath fading, signal synchronization can compensate the delay difference between the interference signal in the receiving spatial channel and the local baseband transmitting signal, and the phase noise can suppress the phase noise damage in the compensated RF path.
  • Step S303 reconstructs the digital baseband signal transmitted by the local end. At this time, the nonlinearity of the received signal is not large, and the requirement for nonlinear cancellation is not high.
  • FIG. 5 is a structural diagram of a non-linear interference canceling apparatus according to an embodiment of the present invention, including:
  • the obtaining unit 501 is configured to obtain a nonlinear distortion indicator of the local radio frequency transmission signal, and calculate an out-of-band distortion power of the local end receiving the radio frequency signal according to the nonlinear distortion index of the local end transmission signal.
  • the determining unit 502 is configured to determine whether the out-of-band distortion power of the local received signal is greater than a first threshold.
  • the constructing unit 503 is configured to calculate a nonlinear relationship of the local transmitting channel, and reconstruct the digital baseband signal transmitted by the local end according to the nonlinear relationship of the transmitting channel of the local end to obtain an interference cancellation signal.
  • the canceling unit 504 is configured to perform digital interference cancellation on the local receiving digital baseband signal by using the interference cancellation signal if the determining unit determines that the out-of-band distortion power of the local receiving signal is greater than the first threshold.
  • the determining unit 502 is connected to the obtaining unit 501, and the obtaining unit 501 sends the out-of-band distortion power of the local receiving signal to the determining unit 502, the canceling unit 504 is connected to the determining unit 502, and the canceling unit 504 is configured to use the determining unit 502. The result of the determination is canceled.
  • the construction unit 503 is connected to the determination unit 502, and the construction unit 503 is configured to determine whether to perform reconstruction of the interference cancellation signal according to the determination result of the determination unit 502.
  • the obtaining unit 501 may specifically acquire the third-order intermodulation (IM3) of the local radio frequency transmission signal; or the obtaining unit 501 may specifically acquire the adjacent channel leakage ratio (ACLR) of the local radio frequency transmission signal.
  • IM3 third-order intermodulation
  • ACLR adjacent channel leakage ratio
  • the acquiring unit 501 specifically calculates the IM3 of the local radio frequency transmission signal by using the following formula: Wherein the total present OIP3 total output IIP3 nonlinear device transmit power P TX channel radio frequency transmit signal present terminal end.
  • the constructing unit 503 can calculate the nonlinear relationship of the local transmitting channel according to the input signal of the amplifier of the local transmitting channel and the output signal of the amplifier of the local transmitting channel.
  • the acquiring unit 501 may specifically obtain the self-interference power of the radio frequency signal received by the local end, and calculate the out-of-band distortion of the radio frequency signal received by the local end according to the nonlinear distortion index of the local end transmitting signal and the self-interference power of the local receiving radio frequency signal. power.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. You can choose some of them according to actual needs or All units are used to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

Embodiments of the present invention provide a method and device for canceling non-linear interference. The method comprises: acquiring a non-linear distortion indicator of a local radio frequency transmission signal, and computing, according to the non-linear distortion indicator of the local transmission signal, an out-of-band distortion power of a local reception radio frequency signal; determining whether the out-of-band distortion power of the local reception signal is greater than a first threshold; computing a non-linear relationship of a local transmission channel, and reconstructing, according to the non-linear relationship of the local transmission channel, a local transmission digital baseband signal to obtain an interference cancellation signal; and if the out-of-band distortion power of the local reception signal is determined to be greater than the first threshold, then performing digital interference cancellation on a local reception digital baseband signal by using the interference cancellation signal.

Description

一种非线性干扰的抵消方法和装置Method and device for canceling nonlinear interference 技术领域Technical field
本发明实施例涉及通信领域，尤其涉及一种非线性干扰的抵消方法和装置。Embodiments of the present invention relate to the field of communications, and in particular, to a method and apparatus for canceling nonlinear interference.
背景技术Background technique
随着移动数据流量的不断增长，网络带宽成倍增加。微波回传作为当前主要的回传方式，传输容量需求需要不断提升以满足无线网络带宽的高速增长。由于微波频谱资源有限，提升频率利用率的方式显得尤为重要。As mobile data traffic continues to grow, network bandwidth doubles. As the current main backhaul mode, microwave backhaul needs to be continuously increased to meet the high-speed growth of wireless network bandwidth. Due to the limited spectrum resources of the microwave, the way to improve the frequency utilization is particularly important.
传统的通信方式主要有时分双工(Time Division Duplex,TDD)和频分双工(Frequency Division Duplex,FDD)两种，时分双工是指发送和接收为不同时隙但相同频率传输的技术，频分双工是指发送和接收为不同的频率但同时传输的技术。同频全双工是在相同时间相同频率双向传输的技术，相比于现有的通信方式，可提升一倍的空口速率。时分双工和频分双工分别在不同时隙和不同频率进行信号传输，因此收发信号之间干扰较小，***实现简单。同频全双工面临的最大问题即为同频干扰，接收端需要对本端同频干扰进行抑制，才能正常解调对端有用信号，进行有效的信号传输。The traditional communication methods are mainly divided into two types: Time Division Duplex (TDD) and Frequency Division Duplex (FDD). Time division duplex refers to the technology of transmitting and receiving transmissions in different time slots but at the same frequency. Frequency division duplexing refers to the technique of transmitting and receiving at different frequencies but transmitting at the same time. Co-frequency full-duplex is a technique of bidirectional transmission at the same frequency at the same time, which can double the air interface rate compared to the existing communication method. Time division duplexing and frequency division duplexing perform signal transmission in different time slots and different frequencies respectively, so the interference between the transmitting and receiving signals is small, and the system is simple to implement. The biggest problem faced by the same-frequency full-duplex is the same-frequency interference. The receiver needs to suppress the same-channel interference at the local end to demodulate the useful signal at the opposite end and perform effective signal transmission.
为了抑制本端同频干扰的影响，非线性干扰是十分重要的考虑因素，现有技术中通常在本端发射部分进行预失真进行提升干扰信号的线性度，这样的抑制方法不够灵活。In order to suppress the influence of the same-frequency interference at the local end, nonlinear interference is a very important consideration. In the prior art, pre-distortion is usually performed at the transmitting portion of the local end to improve the linearity of the interference signal, and such suppression method is not flexible enough.
发明内容Summary of the invention
本发明实施例提供一种非线性干扰的抵消方法和装置，用于解决现有技术中抑制本端同频干扰不灵活的问题。The embodiment of the invention provides a method and a device for canceling non-linear interference, which are used to solve the problem of suppressing inflexibility of the same-frequency interference at the local end in the prior art.
第一方面，提供一种非线性干扰的抵消方法，包括：获取本端射频发射 信号的非线性失真指标，根据所述本端发射信号的非线性失真指标计算本端接收射频信号的带外失真功率，判断所述本端接收信号的带外失真功率是否大于第一阈值，计算本端发射通道的非线性关系，根据本端发射通道的非线性关系对本端发射数字基带信号进行重建，得到干扰抵消信号，如果判断所述本端接收信号的带外失真功率大于第一阈值，利用干扰抵消信号对本端接收数字基带信号进行数字干扰抵消。In a first aspect, a method for canceling nonlinear interference is provided, including: acquiring a local radio frequency transmission The nonlinear distortion index of the signal is calculated according to the nonlinear distortion index of the local transmitting signal, and the out-of-band distortion power of the received RF signal is calculated, and it is determined whether the out-of-band distortion power of the local receiving signal is greater than the first threshold, and the calculation is performed. The nonlinear relationship of the local transmitting channel is reconstructed according to the nonlinear relationship of the transmitting channel of the local end, and the interference digital signal is reconstructed to obtain an interference cancellation signal. If it is determined that the out-of-band distortion power of the local receiving signal is greater than the first threshold, The digital interference cancellation is performed on the local receiving digital baseband signal by using the interference cancellation signal.
结合第一方面，在第一方面的第一种可能的实现方式中，所述获取本端射频发射信号的非线性失真指标包括：获取本端射频发射信号的三阶互调(IM3)；或者获取本端射频发射信号的相邻信道泄漏比(ACLR)。With reference to the first aspect, in a first possible implementation manner of the first aspect, the acquiring a nonlinear distortion indicator of the local radio frequency transmitting signal includes: acquiring a third-order intermodulation (IM3) of the local radio frequency transmitting signal; or Obtain the adjacent channel leakage ratio (ACLR) of the local RF transmission signal.
结合第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，所述获取本端射频发射信号的IM3包括利用下述公式计算本端射频发射信号的IM3：
Figure PCTCN2015091172-appb-000001
其中OIP3总为本端发射通道的非线性器件的总输出三阶交调点，PTX为本端射频发射信号的功率。With reference to the first possible implementation manner of the first aspect, in the second possible implementation manner of the first aspect, the acquiring the IM3 of the local radio frequency transmitting signal includes calculating the IM3 of the local radio frequency transmitting signal by using the following formula :
Figure PCTCN2015091172-appb-000001
Wherein the total present OIP3 total output IIP3 nonlinear device transmit power P TX channel radio frequency transmit signal present terminal end.
结合第一方面的第一种可能的实现方式，在第一方面的第三种可能的实现方式中，所述获取本端射频发射信号的IM3包括利用下述公式计算本端射频发射信号的IM3：IM3＝P主-P3阶，其中P主为本端射频发射信号在频域上的单个主信号功率值，P3阶为本端射频发射信号在频域上的三阶失真功率值。In conjunction with the first possible implementation of the first aspect, in a third possible implementation manner of the first aspect, the acquiring the IM3 of the local radio frequency transmitting signal includes calculating the IM3 of the local radio frequency transmitting signal by using the following formula : IM3 = P -P 3 main bands, wherein the local end P of the main radio frequency transmit signal power of the single main value signal in the frequency domain, P 3 of the present order end radio frequency transmission power value of third-order distortion signal in the frequency domain.
结合第一方面的第一种可能的实现方式，在第一方面的第四种可能的实现方式中，所述获取本端射频发射信号的ACLR包括利用下述公式计算本端射频发射信号的ACLR：ACLR＝P内-P外，其中P内为本端射频发射信号在频域上信号带宽内总功率值，P外为本端射频发射信号在频域上信号外相同带宽的总功率值。With reference to the first possible implementation manner of the first aspect, in the fourth possible implementation manner of the first aspect, the obtaining an ACLR of the local radio frequency transmitting signal includes calculating an ACLR of the local radio frequency transmitting signal by using the following formula : ACLR = P -P within an outer, wherein P in the end of the RF transmitter signal present in the frequency domain power value of the total signal bandwidth, the outer P-based radio frequency transmit signal bandwidth, the total power value of the same signal in the frequency domain the outer end.
结合第一方面或第一方面的第一至第四种可能的实现方式中，在第一方面的第五种可能的实现方式中，利用下述公式获得所述第一阈值：第一阈值＝-174(dBm/Hz)+10log(BW)+NF-Margin，其中，BW为信号带宽， NF为本端接收噪声系数，Margin为一常数。In combination with the first aspect or the first to fourth possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, the first threshold is obtained by using a formula: a first threshold value= -174 (dBm/Hz) + 10 log (BW) + NF-Margin, where BW is the signal bandwidth, NF is the receiving noise figure for the local end, and Margin is a constant.
结合第一方面或第一方面的第一至第五种可能的实现方式中，在第一方面的第六种可能的实现方式中，所述计算本端发射通道的非线性关系包括：根据本端发射通道的放大器的输入信号和本端发射通道的放大器的输出信号计算本端发射通道的非线性关系。In combination with the first aspect or the first to fifth possible implementation manners of the first aspect, in a sixth possible implementation manner of the first aspect, the calculating a nonlinear relationship of the local transmit channel includes: The input signal of the amplifier of the end transmitting channel and the output signal of the amplifier of the local transmitting channel calculate the nonlinear relationship of the transmitting channel of the local end.
结合第一方面或第一方面的第一至第六种可能的实现方式中，在第一方面的第七种可能的实现方式中，所述根据所述本端发射信号的非线性失真指标计算本端接收射频信号的带外失真功率包括：获取本端接收射频信号的自干扰功率，根据所述本端发射信号的非线性失真指标和本端接收射频信号的自干扰功率计算本端接收射频信号的带外失真功率。In combination with the first aspect or the first to sixth possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, the calculating, according to the nonlinear distortion index of the local transmit signal The out-of-band distortion power of the receiving end of the radio frequency signal includes: obtaining the self-interference power of the radio frequency signal received by the local end, and calculating the local receiving radio frequency according to the nonlinear distortion index of the local end transmitting signal and the self-interference power of the local receiving radio frequency signal. Out-of-band distortion power of the signal.
第二方面，提供一种非线性干扰的抵消装置，包括：获取单元，用于获取本端射频发射信号的非线性失真指标，根据所述本端发射信号的非线性失真指标计算本端接收射频信号的带外失真功率；判断单元，用于判断所述本端接收信号的带外失真功率是否大于第一阈值；构建单元，用于计算本端发射通道的非线性关系，根据本端发射通道的非线性关系对本端发射数字基带信号进行重建，得到干扰抵消信号；抵消单元，用于如果判断单元判断所述本端接收信号的带外失真功率大于第一阈值，利用干扰抵消信号对本端接收数字基带信号进行数字干扰抵消。In a second aspect, a non-linear interference cancellation device is provided, including: an acquisition unit, configured to acquire a nonlinear distortion indicator of a local radio frequency transmission signal, and calculate a local reception radio frequency according to the nonlinear distortion index of the local end transmission signal. The out-of-band distortion power of the signal; the determining unit is configured to determine whether the out-of-band distortion power of the local receiving signal is greater than a first threshold; and the constructing unit is configured to calculate a nonlinear relationship of the local transmitting channel, according to the local transmitting channel The non-linear relationship reconstructs the digital baseband signal transmitted by the local end to obtain an interference cancellation signal; and the canceling unit is configured to: if the determining unit determines that the out-of-band distortion power of the local receiving signal is greater than the first threshold, the interference cancellation signal is used to receive the local end Digital baseband signals are digitally offset.
结合第二方面，在第二方面的第一种可能的实现方式中，获取单元具体获取本端射频发射信号的三阶互调(IM3)；或者获取单元具体获取本端射频发射信号的相邻信道泄漏比(ACLR)。With reference to the second aspect, in the first possible implementation manner of the second aspect, the acquiring unit specifically acquires a third-order intermodulation (IM3) of the local radio frequency transmitting signal; or the acquiring unit specifically acquires the adjacent end of the local radio frequency transmitting signal. Channel Leakage Ratio (ACLR).
结合第二方面的第一种可能的实现方式，在第二方面的第二种可能的实现方式中，所述获取单元具体利用下述公式计算本端射频发射信号的IM3：
Figure PCTCN2015091172-appb-000002
其中OIP3总为本端发射通道的非线性器件的总输出三阶交调点，PTX为本端射频发射信号的功率。With reference to the first possible implementation manner of the second aspect, in the second possible implementation manner of the second aspect, the acquiring unit is configured to calculate the IM3 of the local radio frequency transmitting signal by using the following formula:
Figure PCTCN2015091172-appb-000002
Wherein the total present OIP3 total output IIP3 nonlinear device transmit power P TX channel radio frequency transmit signal present terminal end.
结合第二方面的第一种可能的实现方式，在第二方面的第三种可能的实 现方式中，所述获取单元具体利用下述公式计算本端射频发射信号的IM3：IM3＝P主-P3阶，其中P主为本端射频发射信号在频域上的单个主信号功率值，P3阶为本端射频发射信号在频域上的三阶失真功率值。In conjunction with the first possible implementation of the second aspect, in a third possible implementation manner of the second aspect, the acquiring unit specifically calculates the IM3 of the local radio frequency transmitting signal by using the following formula: IM3=P main- order P 3, where P is the present master terminal RF transmit signal power of the single main value signal in the frequency domain, the local end P 3 order radio frequency transmission power value of third-order distortion signal in the frequency domain.
结合第二方面的第一种可能的实现方式，在第二方面的第四种可能的实现方式中，所述获取单元具体利用下述公式计算本端射频发射信号的ACLR：ACLR＝P内-P外，其中P内为本端射频发射信号在频域上信号带宽内总功率值，P外为本端射频发射信号在频域上信号外相同带宽的总功率值。Binding a first possible implementation of the second aspect, a fourth possible implementation manner of the second aspect, the acquiring unit is calculated using the following formula local radio frequency transmit signal ACLR: the ACLR = P - outer P, wherein P in the end of the RF transmitter signal present in the frequency domain power value of the total signal bandwidth, the outer P-based radio frequency transmit signal bandwidth, the total power value of the same signal in the frequency domain the outer end.
结合第二方面或第二方面的第一至第四种可能的实现方式中，在第二方面的第五种可能的实现方式中，其特征在于，所述判断单元利用下述公式获得所述第一阈值：第一阈值＝-174(dBm/Hz)+10log(BW)+NF-Margin，其中，BW为信号带宽，NF为本端接收噪声系数，Margin为一常数。In combination with the second aspect or the first to fourth possible implementation manners of the second aspect, in a fifth possible implementation manner of the second aspect, the determining unit is configured to obtain the First threshold: first threshold = -174 (dBm / Hz) + 10log (BW) + NF - Margin, where BW is the signal bandwidth, NF is the local receiving noise figure, and Margin is a constant.
结合第二方面或第二方面的第一至第五种可能的实现方式中，在第二方面的第六种可能的实现方式中，所述构建单元具体根据本端发射通道的放大器的输入信号和本端发射通道的放大器的输出信号计算本端发射通道的非线性关系。In combination with the second aspect or the first to fifth possible implementation manners of the second aspect, in a sixth possible implementation manner of the second aspect, the constructing unit is specifically configured according to an input signal of an amplifier of the local transmitting channel And the output signal of the amplifier of the local transmitting channel calculates the nonlinear relationship of the local transmitting channel.
结合第二方面或第二方面的第一至第六种可能的实现方式中，在第二方面的第七种可能的实现方式中，所述获取单元具体获取本端接收射频信号的自干扰功率，根据所述本端发射信号的非线性失真指标和本端接收射频信号的自干扰功率计算本端接收射频信号的带外失真功率。With reference to the second aspect or the first to the sixth possible implementation manners of the second aspect, in the seventh possible implementation manner of the second aspect, the acquiring unit is configured to obtain the self-interference power of the local end receiving the radio frequency signal And calculating an out-of-band distortion power of the local terminal receiving the radio frequency signal according to the nonlinear distortion index of the local transmitting signal and the self-interference power of the local receiving radio frequency signal.
本发明实施例通过获取本端射频发射信号的非线性失真指标，根据所述本端发射信号的非线性失真指标计算本端接收射频信号的带外失真功率，并判断所述本端接收信号的带外失真功率是否大于第一阈值，在判断所述本端接收信号的带外失真功率大于第一阈值时，根据本端发射通道的非线性关系对本端发射数字基带信号进行重建，得到干扰抵消信号，使用该干扰抵消信号对本端接收数字基带信号进行数字干扰抵消，从而可以灵活的进行接收信 号的非线性消除，高效的抑制本端同频干扰的影响。In the embodiment of the present invention, the nonlinear distortion index of the local radio frequency transmission signal is obtained, and the out-of-band distortion power of the local end receiving radio frequency signal is calculated according to the nonlinear distortion index of the local end transmitting signal, and the local end receiving signal is determined. Whether the out-of-band distortion power is greater than the first threshold, and when determining that the out-of-band distortion power of the local receiving signal is greater than the first threshold, reconstructing the digital baseband signal of the local end according to the nonlinear relationship of the local transmitting channel, and obtaining interference cancellation The signal uses the interference cancellation signal to perform digital interference cancellation on the local receiving digital baseband signal, so that the receiving signal can be flexibly The nonlinear elimination of the number effectively suppresses the influence of the same-frequency interference at the local end.
附图说明DRAWINGS
为了更清楚地说明本发明实施例的技术方案，下面将对本发明实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.
图1是本发明一个实施例的一种同频全双工通信***的结构图。1 is a structural diagram of a co-frequency full duplex communication system according to an embodiment of the present invention.
图2是本发明一个实施例的一种同频全双工设备的结构图。2 is a structural diagram of a co-frequency full-duplex device according to an embodiment of the present invention.
图3是本发明一个实施例的一种非线性干扰的抵消方法的流程图。3 is a flow chart of a method for canceling nonlinear interference according to an embodiment of the present invention.
图4是本发明一个实施例的一种获取本端接收射频信号的自干扰功率结构图。FIG. 4 is a structural diagram of self-interference power for acquiring a radio frequency signal received by a local end according to an embodiment of the present invention.
图5是本发明一个实施例的一种非线性干扰的抵消装置结构图。FIG. 5 is a structural diagram of a nonlinear interference canceling apparatus according to an embodiment of the present invention.
具体实施方式detailed description
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明的一部分实施例，而不是全部实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都应属于本发明保护的范围。The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.
图1是本发明实施例提供的一种同频全双工通信***，站点A(本端)和站点B(对端)是一对相互通信的微波设备，本端和对端只是相对概念，***在相同时间和相同频率上收发信号，本端不仅接收到对端发射的有用信号S，还会接收到本端发射的自干扰信号I，即当本端和对端同时发送信号时，本端接收到的总信号为S+I。1 is a co-frequency full-duplex communication system according to an embodiment of the present invention. Site A (the local end) and the site B (the opposite end) are a pair of microwave devices that communicate with each other. The local end and the opposite end are only relative concepts. The system transmits and receives signals at the same time and the same frequency. The local end not only receives the useful signal S transmitted by the opposite end, but also receives the self-interference signal I transmitted by the local end, that is, when the local end and the opposite end simultaneously transmit signals, The total signal received by the terminal is S+I.
图2是本发明实施例提供的一种同频全双工设备结构图，例如可以为图1中的站点A。图2中的同频全双工设备主要分为上下两部分，上面为发射 通道，下面为接收通道，中间为非线性干扰抵消部分。其中发射通道中，基带101用于数字基带信号的发送处理，数模转换器102将数字信号转换为模拟信号，中频103包括中频信号的上变频、滤波、放大等功能，射频104包括射频信号的上变频、滤波、放大等功能，功率放大器105用于放大发射端功率信号，发射天线将射频信号发射到空间信道中；信号接收通道中，接收天线从空间信道中接收信号，接收信号不仅包括对端发送的有用信号，还包括本端发送的干扰信号，低噪声放大器111放大接收到的功率信号，射频112包括射频信号的下变频、滤波、放大等功能，中频113包括中频信号的下变频、滤波、放大等功能，模数转换器114将模拟信号转换为数字信号，基带115包括数字信号的接收处理。中间的非线性干扰抵消部分用于在数字端抵消接收到的干扰信号，包括获取单元121，判断单元122，构建单元123和抵消单元124。下面将对中间的非线性干扰抵消部分进行说明。2 is a structural diagram of a co-frequency full-duplex device according to an embodiment of the present invention, which may be, for example, the site A in FIG. The same-frequency full-duplex device in Figure 2 is mainly divided into upper and lower parts, with the above emission Channel, below is the receiving channel, and the middle is the nonlinear interference cancellation part. In the transmitting channel, the baseband 101 is used for transmitting the digital baseband signal, the digital-to-analog converter 102 converts the digital signal into an analog signal, the intermediate frequency 103 includes functions of up-conversion, filtering, and amplification of the intermediate frequency signal, and the radio frequency 104 includes the radio frequency signal. The functions of up-conversion, filtering, amplification, etc., the power amplifier 105 is used to amplify the power signal of the transmitting end, and the transmitting antenna transmits the radio frequency signal to the spatial channel; in the signal receiving channel, the receiving antenna receives the signal from the spatial channel, and the receiving signal includes not only the pair The useful signal sent by the terminal further includes an interference signal sent by the local end, the low noise amplifier 111 amplifies the received power signal, the radio frequency 112 includes functions of down-conversion, filtering, and amplification of the radio frequency signal, and the intermediate frequency 113 includes down-conversion of the intermediate frequency signal, For filtering, amplification, etc., the analog to digital converter 114 converts the analog signal into a digital signal, and the baseband 115 includes a digital signal receiving process. The intermediate nonlinear interference cancellation portion is used to cancel the received interference signal at the digital end, including the acquisition unit 121, the determination unit 122, the construction unit 123, and the cancellation unit 124. The intermediate nonlinear interference cancellation section will be described below.
图3是本发明实施例提供的一种非线性干扰的抵消方法的流程图，包括：FIG. 3 is a flowchart of a method for canceling nonlinear interference according to an embodiment of the present invention, including:
S301，获取本端射频发射信号的非线性失真指标，根据所述本端发射信号的非线性失真指标计算本端接收射频信号的带外失真功率。S301: Acquire a nonlinear distortion indicator of the local radio frequency transmission signal, and calculate an out-of-band distortion power of the local end receiving radio frequency signal according to the nonlinear distortion index of the local end transmission signal.
本发明实施例中，本端射频发射信号可以是图2中功率放大器105后的信号，即经过功率放大器105处理的发射信号，本端接收射频信号可以是低噪声放大器111之前的信号，即未经过低噪声放大器111处理的接收信号。可通过在信号通路中耦合一部分功率得到相应信号。如果对端未开启，则本端接收射频信号包括本端发射的自干扰信号I，不包括对端发射的有用信号S；如果对端开启，则本端接收射频信号包括本端发射的自干扰信号I，还包括对端发射的有用信号S。In the embodiment of the present invention, the local radio frequency transmission signal may be the signal after the power amplifier 105 in FIG. 2, that is, the transmission signal processed by the power amplifier 105, and the local end receiving radio frequency signal may be the signal before the low noise amplifier 111, that is, not The received signal processed by the low noise amplifier 111. A corresponding signal can be obtained by coupling a portion of the power in the signal path. If the peer end is not enabled, the local end receiving the radio frequency signal includes the self-interference signal I transmitted by the local end, and does not include the useful signal S transmitted by the opposite end; if the opposite end is turned on, the local end receives the radio frequency signal including the self-interference transmitted by the local end. Signal I also includes a useful signal S transmitted by the opposite end.
一、首先需要获取本端射频发射信号的非线性失真指标，其中非线性失真指标可以为三阶互调(IM3)、相邻信道泄漏比(ACLR)等，其中IM3为三阶互调功率与有用信号功率的差值，ACLR为输出信号邻道泄漏功率与主信道载波功率的差值，如果IM3和ACLR使用的单位不同，IM3和ACLR可以是相 应功率的比值。发射信号的非线性分量可通过当前发射信号功率计算得到，也可以通过获取当前的发射端非线性特性得到，下面以3种获取方法为例进行简单说明。First, it is necessary to obtain the nonlinear distortion index of the local RF transmission signal, wherein the nonlinear distortion index can be third-order intermodulation (IM3), adjacent channel leakage ratio (ACLR), etc., where IM3 is the third-order intermodulation power and The difference between the useful signal power, ACLR is the difference between the adjacent channel leakage power of the output signal and the main channel carrier power. If the units used by IM3 and ACLR are different, IM3 and ACLR can be phase. The ratio of the power should be. The nonlinear component of the transmitted signal can be calculated by the current transmitted signal power, or can be obtained by obtaining the current nonlinear characteristics of the transmitting end. The following three methods are taken as an example for brief description.
1、通过发射功率的计算方法。发射端非线性失真指标IM3可表示为发射功率的函数，即IM3＝f(PTX)，详细表示与发射功率和总输出三阶交调点有关。总输出三阶交调点OIP3总为发射端器件输出三阶交调点级联值，若器件1和2级联，则级联后总的输出三阶交调点
Figure PCTCN2015091172-appb-000003
其中G2为器件2增益，OIP3为各器件的三阶交调参数。发射端的IM3可以表示为：IM3＝2[OIP3总-PTX]，其中OIP3总为本端发射通道的非线性器件的总输出三阶交调点，PTX为本端射频发射信号的功率。1. Calculate the transmission power. The transmitter nonlinear distortion indicator IM3 can be expressed as a function of the transmission power, that is, IM3=f(P TX ), and the detailed representation is related to the transmission power and the third-order intercept point of the total output. The total output third-order intercept point OIP3 always outputs the third-order intercept point cascading value of the transmitting device. If the devices 1 and 2 are cascaded, the total output third-order intercept point after cascading
Figure PCTCN2015091172-appb-000003
Where G2 is the gain of the device 2, and OIP3 is the third-order intermodulation parameter of each device. The IM3 of the transmitting end can be expressed as: IM3=2[OIP3 total- P TX ], wherein OIP3 is always the third-order intermodulation point of the total output of the nonlinear device of the local transmitting channel, and P TX is the power of the radio transmitting signal of the end.
2、通过发射端非线性特性的计算方法。发射端的非线性特性主要由PA引起，因此需要在PA后端获取非线性特性。通过将PA输出信号通过下变频后获取基带数据信号So，可获得发射端非线性失真指标IM3＝f(So)。具体可采用如下方法，获取基带数据信号So，该信号为时域信号，先转换到频域，计算单个主信号功率P主和三阶失真功率P3阶，则发射端的非线性失真指标为IM3＝P主-P3阶，其中P主为本端射频发射信号在频域上的单个主信号功率值，P3阶为本端射频发射信号在频域上的三阶失真功率值。2. Calculate the nonlinear characteristics of the transmitting end. The nonlinear characteristics of the transmitting end are mainly caused by PA, so it is necessary to obtain nonlinear characteristics at the back end of the PA. By obtaining the baseband data signal So by down-converting the PA output signal, a nonlinear distortion index IM3=f(S o ) at the transmitting end can be obtained. DETAILED nonlinear distortion metrics may be employed a method of obtaining a baseband data signal So, the signal is a time domain signal, first into the frequency domain, a single primary signal power P is calculated and the third-order distortion power main stage P3, the transmitter is IM3 = P -P 3 main bands, wherein the local end P of the main radio frequency transmit signal power of the single main value signal in the frequency domain, P 3 of the present order end radio frequency transmission power value of third-order distortion signal in the frequency domain.
3、发射信号的非线性失真指标ACLR也可以通过发射端非线性特性得到。发射端的非线性特性主要由PA引起，因此需要在PA后端获取非线性特性。通过将PA输出信号通过下变频后获取基带数据信号So，可获得发射端非线性失真分量ACLR＝f(So)。详细叙述可采用如下方法，获取基带数据信号So，信号为时域信号，先转换到频域，计算信号带宽内总功率P内和信号外相同带宽的总功率P外，则发射端的非线性失真指标为ACLR＝P内-P外，其中P内为 本端射频发射信号在频域上信号带宽内总功率值，P外为本端射频发射信号在频域上信号外相同带宽的总功率值。3. The nonlinear distortion index ACLR of the transmitted signal can also be obtained by the nonlinear characteristic of the transmitting end. The nonlinear characteristics of the transmitting end are mainly caused by PA, so it is necessary to obtain nonlinear characteristics at the back end of the PA. PA output signal acquired by the baseband data signal is down-converted by So, the nonlinear distortion components obtained emission ends ACLR = f (S o). The method can be described in detail below, capture data signal So, the baseband signal is a time domain signal, first into the frequency domain, within the same bandwidth outside the total power P in the signal bandwidth is calculated total signal power P and the outer, non-linear distortion of the transmitter indicators ACLR = P -P within an outer, wherein the total transmit power of P values within the bandwidth of the signal in the frequency domain of the local radio frequency transmit port of the RF signal of the same bandwidth as the total power value of a signal in the frequency domain outside outer-based P .
二、下面说明如何根据本端发射信号的非线性失真指标计算本端接收射频信号的带外失真功率。Second, the following describes how to calculate the out-of-band distortion power of the receiving RF signal according to the nonlinear distortion index of the local transmitting signal.
1、如果开启本端发射信号，使本端信号从天线端发出。关闭对端发射信号，可通过关闭对端发射端电源或不发送数据来实现，例如设置为静默状态。1. If the local end transmitting signal is turned on, the local end signal is sent from the antenna end. Turning off the peer transmit signal can be achieved by turning off the power of the peer transmitter or not sending data, for example, setting it to a silent state.
本端发射信号经过空间信道到达本端接收端，认为接收端非线性失真指标等于发射端非线性失真指标，本端接收信号非线性失真分量功率P失真＝PRX-3-IM3或P失真＝PRX-ACLR，其中PRX为本端接收射频信号的功率。The local transmitting signal reaches the local receiving end through the spatial channel, and the nonlinear distortion index of the receiving end is equal to the nonlinear distortion index of the transmitting end, and the local receiving signal nonlinear distortion component power P distortion =P RX -3-IM3 or P distortion = P RX -ACLR, where P RX is the power of the receiving end of the radio frequency signal.
2、如果开启本端发射信号，使本端信号从天线端发出。同时开启对端发射信号，使对端信号从天线端发出。2. If the local end transmitting signal is turned on, the local end signal is sent from the antenna end. At the same time, the opposite end transmitting signal is turned on, so that the opposite end signal is sent from the antenna end.
此时本端接收射频信号功率PRX总包括本端自干扰信号I和对端有用信号S的总功率，可认为在数字端检测到的有用信号S和自干扰信号I功率比值SIR与接收机前端检测到的SIR值相同。本端发射信号经过空间信道到达接收端，认为接收端非线性失真指标等于发射端非线性失真指标，本端接收到本端发射信号的非线性失真分量功率P失真＝PRX-I-3-IM3或P失真＝PRX-I-ACLR。At this time, the local terminal receiving radio frequency signal power P RX always includes the total power of the local self-interference signal I and the opposite end useful signal S, and can be regarded as the useful signal S and the self-interference signal I power ratio SIR and the receiver detected at the digital end. The SIR values detected by the front end are the same. The local transmitting signal reaches the receiving end through the spatial channel, and the nonlinear distortion index of the receiving end is equal to the nonlinear distortion index of the transmitting end, and the local end receives the nonlinear distortion component of the transmitting signal of the local end. Power P distortion =P RX- I-3- IM3 or P distortion = P RX- I-ACLR.
可通过如下方法获得本端接收射频信号的自干扰功率PRX-I。如图4所示，为本发明实施例提供的一种获取本端接收射频信号的自干扰功率结构图，在数字端接收到的总信号为S+I，经过均衡器c1，得到S*c1+I*c1，数字端产生的自干扰信号
Figure PCTCN2015091172-appb-000004
经过均衡器c2后，得到
Figure PCTCN2015091172-appb-000005
两路信号进行合路，最终输出有用信号。当均衡器收敛后，即认为
Figure PCTCN2015091172-appb-000006
和
Figure PCTCN2015091172-appb-000007
数字端可得到有用信号S和干扰信号I的比值
Figure PCTCN2015091172-appb-000008
获得SIR值和PRX总后，可 计算得到
Figure PCTCN2015091172-appb-000009
The self-interference power P RX- I of the local end receiving radio frequency signal can be obtained by the following method. As shown in FIG. 4, a self-interference power structure diagram for acquiring a radio frequency signal received by a local end according to an embodiment of the present invention is provided. The total signal received at the digital end is S+I, and the equalizer c1 is used to obtain S*c1. +I*c1, self-interference signal generated by the digital terminal
Figure PCTCN2015091172-appb-000004
After the equalizer c2, get
Figure PCTCN2015091172-appb-000005
The two signals are combined to finally output a useful signal. When the equalizer converges, it is considered
Figure PCTCN2015091172-appb-000006
with
Figure PCTCN2015091172-appb-000007
The digital terminal can obtain the ratio of the useful signal S to the interference signal I
Figure PCTCN2015091172-appb-000008
After obtaining the total SIR value and P RX, can be calculated
Figure PCTCN2015091172-appb-000009
S302，判断所述本端接收信号的带外失真功率是否大于第一阈值。S302. Determine whether an out-of-band distortion power of the local received signal is greater than a first threshold.
根据计算得到的本端接收射频信号的带外失真功率，与第一阈值进行比较，如果判断所述本端接收信号的带外失真功率大于第一阈值，则利用下面重建的干扰抵消信号进行干扰抵消。And calculating, according to the calculated out-of-band distortion power of the local-end receiving radio frequency signal, comparing with the first threshold, if it is determined that the out-of-band distortion power of the local receiving signal is greater than the first threshold, performing interference by using the reconstructed interference cancellation signal offset.
第一阈值可以为接收机后端噪声功率再加上一定余量Margin，即使用下面公式：The first threshold can be the receiver back-end noise power plus a margin Margin, ie using the following formula:
第一阈值＝-174(dBm/Hz)+10log(BW)+NF-MarginFirst threshold = -174 (dBm / Hz) + 10log (BW) + NF-Margin
其中，BW为信号带宽(单位为Hz)，NF为本端接收噪声系数，Margin为一常数，例如若Margin＝10dB，可认为底噪被恶化10dB。Among them, BW is the signal bandwidth (in Hz), NF is the receiving noise coefficient of the local end, and Margin is a constant. For example, if Margin=10dB, the noise floor can be considered to be deteriorated by 10dB.
S303，计算本端发射通道的非线性关系，根据本端发射通道的非线性关系对本端发射数字基带信号进行重建，得到干扰抵消信号。S303. Calculate a nonlinear relationship of the local transmitting channel, and reconstruct a digital baseband signal of the local end according to a nonlinear relationship of the transmitting channel of the local end to obtain an interference cancellation signal.
首先需要计算本端发射通道的非线性关系。发射端的非线性主要由功率放大器105引起，可以将功率放大器105的非线性关系等效为发射端的非线性关系，通过获取功率放大器105输入端和输出端的特性值，可获得功率放大器105的非线性关系。通过获取功率放大器105输入端和输出端的包络信号，可得到功率放大器105的输入信号和输出信号，包络信号可通过专用芯片得到，然后通过一个模数转换器将模拟包络信号转换为数字信号，从而得到功率放大器105的输入基带数据Si和输出基带数据So。也可通过将功率放大器105的输入信号和输出信号分别下变频转换为低频信号，再经过一个模数转换器将低频信号转换为数字信号，得到功率放大器105的输入基带数据和输出基带数据。First, you need to calculate the nonlinear relationship of the local transmit channel. The nonlinearity of the transmitting end is mainly caused by the power amplifier 105, and the nonlinear relationship of the power amplifier 105 can be equivalent to the nonlinear relationship of the transmitting end. By obtaining the characteristic values of the input end and the output end of the power amplifier 105, the nonlinearity of the power amplifier 105 can be obtained. relationship. By obtaining the envelope signals at the input and output of the power amplifier 105, the input signal and the output signal of the power amplifier 105 can be obtained. The envelope signal can be obtained by a dedicated chip, and then the analog envelope signal is converted into a digital signal through an analog-to-digital converter. The signal is such that the input baseband data Si of the power amplifier 105 and the output baseband data So are obtained. The input baseband data and the output baseband data of the power amplifier 105 can also be obtained by downconverting the input signal and the output signal of the power amplifier 105 into a low frequency signal and then converting the low frequency signal into a digital signal through an analog to digital converter.
对基带信号进行非线性特性建模，在建模之前，可以对功率放大器105输入信号和输出信号进行延时对齐，分别得到对齐后的输入信号Si *和输出信号So *。将对齐后的输入信号Si *和输出信号So *进行建模操作So *＝f(Si *)，例如无 记忆多项式模型So *＝∑nan(Si *)n，其中an为多项式系数。这个无记忆多项式模型即为本端发射通道的非线性关系。The nonlinear characteristic of the baseband signal is modeled. Before the modeling, the input signal and the output signal of the power amplifier 105 can be time-aligned to obtain the aligned input signal S i * and the output signal S o * , respectively . The aligned input signal S i * and the output signal S o * are subjected to a modeling operation S o * =f(S i * ), for example, a memory-free polynomial model S o * = ∑ n a n (S i * ) n , Where a n is a polynomial coefficient. This memoryless polynomial model is the nonlinear relationship of the local transmit channel.
接下来根据本端发射通道的非线性关系对本端发射数字基带信号进行重建，得到干扰抵消信号。Then, according to the nonlinear relationship of the local transmitting channel, the digital baseband signal transmitted at the local end is reconstructed to obtain an interference cancellation signal.
例如可以使用上面得到的无记忆多项式模型对本端发射数字基带信号进行重建，从而模拟功率放大器105非线性失真特性，得到的干扰抵消信号例如可以为y＝∑nanxn，y为干扰抵消信号，x为本端发射数字基带信号，an为多项式系数。For example, the non-memory polynomial model obtained above can be used to reconstruct the local transmit digital baseband signal, thereby simulating the nonlinear distortion characteristic of the power amplifier 105, and the obtained interference cancellation signal can be, for example, y=∑ n a n x n , y is interference cancellation. signal, x-oriented end transmission digital baseband signal, a n polynomial coefficients.
S304，如果判断所述本端接收信号的带外失真功率大于第一阈值，利用干扰抵消信号对本端接收数字基带信号进行数字干扰抵消。S304. If it is determined that the out-of-band distortion power of the local receiving signal is greater than the first threshold, the interference cancellation signal is used to perform digital interference cancellation on the local receiving digital baseband signal.
步骤S303的动作也可以在判断所述本端接收信号的带外失真功率大于第一阈值时才启动，也可以预先启动，需要使用时直接使用。The operation of step S303 may be started only when it is determined that the out-of-band distortion power of the local receiving signal is greater than the first threshold, or may be started in advance, and used directly when needed.
在利用干扰抵消信号对本端接收数字基带信号进行数字干扰抵消之前，可以对干扰抵消信号进行包括信道估计、信号同步和相位噪声抑制等操作，信道估计可以补偿器件不平坦和空间多径信道带来的多径衰落，信号同步可以补偿本端接收空间信道中干扰信号和本端基带发射信号之间的延时差，相位噪声可以抑制补偿射频通路中相位噪声损伤。Before using the interference cancellation signal to digitally cancel the digital baseband signal received by the local end, the interference cancellation signal can be subjected to operations including channel estimation, signal synchronization, and phase noise suppression. The channel estimation can compensate for device unevenness and spatial multipath channel. The multipath fading, signal synchronization can compensate the delay difference between the interference signal in the receiving spatial channel and the local baseband transmitting signal, and the phase noise can suppress the phase noise damage in the compensated RF path.
如果判断所述本端接收信号的带外失真功率不大于第一阈值，可以不对对本端接收数字基带信号进行数字干扰抵消，也可以直接使用本端发射数字基带信号进行数字干扰抵消，即不使用步骤S303对本端发射数字基带信号进行重建，此时接收信号的非线性不大，对非线性抵消的要求不高。If it is determined that the out-of-band distortion power of the local receiving signal is not greater than the first threshold, the digital interference cancellation may be performed on the digital baseband signal received by the local end, or the digital baseband signal may be directly used to perform digital interference cancellation, that is, not used. Step S303 reconstructs the digital baseband signal transmitted by the local end. At this time, the nonlinearity of the received signal is not large, and the requirement for nonlinear cancellation is not high.
图5为本发明实施例提供的一种非线性干扰的抵消装置结构图，包括：FIG. 5 is a structural diagram of a non-linear interference canceling apparatus according to an embodiment of the present invention, including:
获取单元501，用于获取本端射频发射信号的非线性失真指标，根据所述本端发射信号的非线性失真指标计算本端接收射频信号的带外失真功率。The obtaining unit 501 is configured to obtain a nonlinear distortion indicator of the local radio frequency transmission signal, and calculate an out-of-band distortion power of the local end receiving the radio frequency signal according to the nonlinear distortion index of the local end transmission signal.
判断单元502，用于判断所述本端接收信号的带外失真功率是否大于第一阈值。 The determining unit 502 is configured to determine whether the out-of-band distortion power of the local received signal is greater than a first threshold.
构建单元503，用于计算本端发射通道的非线性关系，根据本端发射通道的非线性关系对本端发射数字基带信号进行重建，得到干扰抵消信号。The constructing unit 503 is configured to calculate a nonlinear relationship of the local transmitting channel, and reconstruct the digital baseband signal transmitted by the local end according to the nonlinear relationship of the transmitting channel of the local end to obtain an interference cancellation signal.
抵消单元504，用于如果判断单元判断所述本端接收信号的带外失真功率大于第一阈值，利用干扰抵消信号对本端接收数字基带信号进行数字干扰抵消。The canceling unit 504 is configured to perform digital interference cancellation on the local receiving digital baseband signal by using the interference cancellation signal if the determining unit determines that the out-of-band distortion power of the local receiving signal is greater than the first threshold.
其中，判断单元502和获取单元501相连，获取单元501将所述本端接收信号的带外失真功率发送到判断单元502，抵消单元504和判断单元502相连，抵消单元504用于根据判断单元502的判断结果进行抵消，当然在其他实施例中，构建单元503和判断单元502相连，构建单元503用于根据判断单元502的判断结果决定是否进行干扰抵消信号的重建。The determining unit 502 is connected to the obtaining unit 501, and the obtaining unit 501 sends the out-of-band distortion power of the local receiving signal to the determining unit 502, the canceling unit 504 is connected to the determining unit 502, and the canceling unit 504 is configured to use the determining unit 502. The result of the determination is canceled. Of course, in other embodiments, the construction unit 503 is connected to the determination unit 502, and the construction unit 503 is configured to determine whether to perform reconstruction of the interference cancellation signal according to the determination result of the determination unit 502.
其中，获取单元501可以具体获取本端射频发射信号的三阶互调(IM3)；或者获取单元501可以具体获取本端射频发射信号的相邻信道泄漏比(ACLR)。The obtaining unit 501 may specifically acquire the third-order intermodulation (IM3) of the local radio frequency transmission signal; or the obtaining unit 501 may specifically acquire the adjacent channel leakage ratio (ACLR) of the local radio frequency transmission signal.
其中所述获取单元501具体利用下述公式计算本端射频发射信号的IM3：
Figure PCTCN2015091172-appb-000010
其中OIP3总为本端发射通道的非线性器件的总输出三阶交调点，PTX为本端射频发射信号的功率。The acquiring unit 501 specifically calculates the IM3 of the local radio frequency transmission signal by using the following formula:
Figure PCTCN2015091172-appb-000010
Wherein the total present OIP3 total output IIP3 nonlinear device transmit power P TX channel radio frequency transmit signal present terminal end.
其中所述获取单元501具体利用下述公式计算本端射频发射信号的IM3：IM3＝P主-P3阶，其中P主为本端射频发射信号在频域上的单个主信号功率值，P3阶为本端射频发射信号在频域上的三阶失真功率值。The acquiring unit 501 specifically calculates the IM3 of the local radio frequency transmission signal by using the following formula: IM3=P main- P 3 order , wherein the P main is the power value of the single main signal of the radio frequency transmitting signal in the frequency domain, P 3-order end of the present power value of the radio frequency transmission signal in the third-order distortion frequency domain.
其中所述获取单元501具体利用下述公式计算本端射频发射信号的ACLR：ACLR＝P内-P外，其中P内为本端射频发射信号在频域上信号带宽内总功率值，P外为本端射频发射信号在频域上信号外相同带宽的总功率值。Wherein said obtaining unit 501 specifically ACLR calculated as follows using the local radio frequency transmit signal: ACLR = P -P within an outer, wherein the inner end of the RF transmit signal P of the present power value of the total signal bandwidth, in the frequency domain on the outer P The total power value of the same bandwidth outside the signal in the frequency domain of the local RF transmission signal.
其中，所述判断单元502可以利用下述公式获得所述第一阈值：第一阈值＝-174(dBm/Hz)+10log(BW)+NF-Margin，其中，BW为信号带宽，NF为本端接收噪声系数，Margin为一常数。 The determining unit 502 can obtain the first threshold by using a formula: a first threshold=−174 (dBm/Hz)+10log(BW)+NF-Margin, where BW is a signal bandwidth, and NF is The terminal receives the noise figure, and Margin is a constant.
其中，构建单元503可以具体根据本端发射通道的放大器的输入信号和本端发射通道的放大器的输出信号计算本端发射通道的非线性关系。The constructing unit 503 can calculate the nonlinear relationship of the local transmitting channel according to the input signal of the amplifier of the local transmitting channel and the output signal of the amplifier of the local transmitting channel.
其中，获取单元501可以具体获取本端接收射频信号的自干扰功率，根据所述本端发射信号的非线性失真指标和本端接收射频信号的自干扰功率计算本端接收射频信号的带外失真功率。The acquiring unit 501 may specifically obtain the self-interference power of the radio frequency signal received by the local end, and calculate the out-of-band distortion of the radio frequency signal received by the local end according to the nonlinear distortion index of the local end transmitting signal and the self-interference power of the local receiving radio frequency signal. power.
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，例如图5中的获取单元，判断单元，构建单元和抵消单元均可以采用逻辑电路进行实现，也可以使用使用CPU进行实现，这种实现不应认为超出本发明的范围。Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, for clarity of hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. The professional technician can use different methods to implement the described functions for each specific application. For example, the obtaining unit, the determining unit, the building unit and the canceling unit in FIG. 5 can be implemented by using logic circuits, or using a CPU. Implementations are not considered to be outside the scope of the present invention.
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的***、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.
在本申请所提供的几个实施例中，应该理解到，所揭露的***、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个***，或一些特征可以忽略，或不执行。另外，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口、装置或单元的间接耦合或通信连接，也可以是电的，机械的或其它的形式连接。In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或 者全部单元来实现本发明实施例方案的目的。The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. You can choose some of them according to actual needs or All units are used to achieve the objectives of the embodiments of the present invention.
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以是两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分，或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到各种等效的修改或替换，这些修改或替换都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以权利要求的保护范围为准。 The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any equivalent person can be easily conceived within the technical scope of the present invention by any person skilled in the art. Modifications or substitutions are intended to be included within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims (16)

  1. 一种非线性干扰的抵消方法，其特征在于，包括：A method for canceling nonlinear interference, comprising:
    获取本端射频发射信号的非线性失真指标，根据所述本端发射信号的非线性失真指标计算本端接收射频信号的带外失真功率；Obtaining a nonlinear distortion indicator of the local radio frequency transmitting signal, and calculating an out-of-band distortion power of the local receiving radio frequency signal according to the nonlinear distortion index of the local transmitting signal;
    判断所述本端接收信号的带外失真功率是否大于第一阈值；Determining whether the out-of-band distortion power of the local received signal is greater than a first threshold;
    计算本端发射通道的非线性关系，根据本端发射通道的非线性关系对本端发射数字基带信号进行重建，得到干扰抵消信号；Calculating the nonlinear relationship of the local transmitting channel, reconstructing the digital baseband signal transmitted by the local end according to the nonlinear relationship of the transmitting channel of the local end, and obtaining an interference cancellation signal;
    如果判断所述本端接收信号的带外失真功率大于第一阈值，利用干扰抵消信号对本端接收数字基带信号进行数字干扰抵消。If it is determined that the out-of-band distortion power of the local receiving signal is greater than the first threshold, the interference cancellation signal is used to perform digital interference cancellation on the local receiving digital baseband signal.
  2. 根据权利要求1所述的方法，其特征在于，所述获取本端射频发射信号的非线性失真指标包括：The method according to claim 1, wherein the obtaining a nonlinear distortion indicator of the local radio frequency transmission signal comprises:
    获取本端射频发射信号的三阶互调(IM3)；或者Obtain the third-order intermodulation (IM3) of the local RF transmission signal; or
    获取本端射频发射信号的相邻信道泄漏比(ACLR)。Obtain the adjacent channel leakage ratio (ACLR) of the local RF transmission signal.
  3. 根据权利要求2所述的方法，其特征在于，所述获取本端射频发射信号的IM3包括利用下述公式计算本端射频发射信号的IM3：The method according to claim 2, wherein the obtaining the IM3 of the local radio frequency transmission signal comprises calculating the IM3 of the local radio frequency transmission signal by using the following formula:
    Figure PCTCN2015091172-appb-100001
    Figure PCTCN2015091172-appb-100001
    其中OIP3总为本端发射通道的非线性器件的总输出三阶交调点，PTX为本端射频发射信号的功率。Wherein the total present OIP3 total output IIP3 nonlinear device transmit power P TX channel radio frequency transmit signal present terminal end.
  4. 根据权利要求2所述的方法，其特征在于，所述获取本端射频发射信号的IM3包括利用下述公式计算本端射频发射信号的IM3：The method according to claim 2, wherein the obtaining the IM3 of the local radio frequency transmission signal comprises calculating the IM3 of the local radio frequency transmission signal by using the following formula:
    IM3＝P主-P3阶 IM3=P main- P 3 order
    其中P主为本端射频发射信号在频域上的单个主信号功率值，P3阶为本端射频发射信号在频域上的三阶失真功率值。The P main frequency is the single main signal power value of the local radio frequency transmitting signal in the frequency domain, and the P 3 order is the third order distortion power value of the local radio frequency transmitting signal in the frequency domain.
  5. 根据权利要求2所述的方法，其特征在于，所述获取本端射频发射信号的ACLR包括利用下述公式计算本端射频发射信号的ACLR： The method according to claim 2, wherein the obtaining the ACLR of the local radio frequency transmission signal comprises calculating an ACLR of the local radio frequency transmission signal by using the following formula:
    ACLR＝P内-P外 ACLR=P inside- P outside
    其中P内为本端射频发射信号在频域上信号带宽内总功率值，P外为本端射频发射信号在频域上信号外相同带宽的总功率值。The total power value of the signal bandwidth in the frequency domain of the local radio frequency transmitting signal in P , and the total power value of the same bandwidth outside the signal of the radio frequency transmitting signal in the frequency domain.
  6. 根据权利要求1至5任一项所述的方法，其特征在于，利用下述公式获得所述第一阈值：The method according to any one of claims 1 to 5, characterized in that the first threshold is obtained using the following formula:
    第一阈值＝-174(dBm/Hz)+10log(BW)+NF-MarginFirst threshold = -174 (dBm / Hz) + 10log (BW) + NF-Margin
    其中，BW为信号带宽，NF为本端接收噪声系数，Margin为一常数。Among them, BW is the signal bandwidth, NF is the receiving noise coefficient of the local end, and Margin is a constant.
  7. 根据权利要求1至6任一项所述的方法，其特征在于，所述计算本端发射通道的非线性关系包括：The method according to any one of claims 1 to 6, wherein the calculating the nonlinear relationship of the local transmitting channel comprises:
    根据本端发射通道的放大器的输入信号和本端发射通道的放大器的输出信号计算本端发射通道的非线性关系。The nonlinear relationship of the local transmitting channel is calculated according to the input signal of the amplifier of the local transmitting channel and the output signal of the amplifier of the local transmitting channel.
  8. 根据权利要求1至7任一项所述的方法，其特征在于，所述根据所述本端发射信号的非线性失真指标计算本端接收射频信号的带外失真功率包括：The method according to any one of claims 1 to 7, wherein the calculating the out-of-band distortion power of the local receiving radio frequency signal according to the nonlinear distortion index of the local transmitting signal comprises:
    获取本端接收射频信号的自干扰功率；Obtaining the self-interference power of the local receiving radio frequency signal;
    根据所述本端发射信号的非线性失真指标和本端接收射频信号的自干扰功率计算本端接收射频信号的带外失真功率。The out-of-band distortion power of the local receiving radio frequency signal is calculated according to the nonlinear distortion index of the local transmitting signal and the self-interference power of the local receiving radio frequency signal.
  9. 一种非线性干扰的抵消装置，其特征在于，包括：A non-linear interference cancellation device, comprising:
    获取单元，用于获取本端射频发射信号的非线性失真指标，根据所述本端发射信号的非线性失真指标计算本端接收射频信号的带外失真功率；The acquiring unit is configured to obtain a nonlinear distortion indicator of the local radio frequency transmitting signal, and calculate an out-of-band distortion power of the local receiving radio frequency signal according to the nonlinear distortion index of the local transmitting signal;
    判断单元，用于判断所述本端接收信号的带外失真功率是否大于第一阈值；a determining unit, configured to determine whether an out-of-band distortion power of the local received signal is greater than a first threshold;
    构建单元，用于计算本端发射通道的非线性关系，根据本端发射通道的非线性关系对本端发射数字基带信号进行重建，得到干扰抵消信号；The construction unit is configured to calculate a nonlinear relationship of the local transmitting channel, and reconstruct the digital baseband signal transmitted by the local end according to the nonlinear relationship of the transmitting channel of the local end to obtain an interference cancellation signal;
    抵消单元，用于如果判断单元判断所述本端接收信号的带外失真功率大于第一阈值，利用干扰抵消信号对本端接收数字基带信号进行数字干扰抵 消。The canceling unit is configured to: if the determining unit determines that the out-of-band distortion power of the local receiving signal is greater than the first threshold, using the interference cancellation signal to digitally interfere with the receiving the digital baseband signal at the local end Eliminate.
  10. 根据权利要求9所述的装置，其特征在于The device of claim 9 wherein
    获取单元具体获取本端射频发射信号的三阶互调(IM3)；或者The acquiring unit specifically obtains the third-order intermodulation (IM3) of the local radio frequency transmitting signal; or
    获取单元具体获取本端射频发射信号的相邻信道泄漏比(ACLR)。The acquiring unit specifically obtains an adjacent channel leakage ratio (ACLR) of the local radio frequency transmitting signal.
  11. 根据权利要求10所述的装置，其特征在于，所述获取单元具体利用下述公式计算本端射频发射信号的IM3：The apparatus according to claim 10, wherein the obtaining unit specifically calculates the IM3 of the local radio frequency transmission signal by using the following formula:
    Figure PCTCN2015091172-appb-100002
    Figure PCTCN2015091172-appb-100002
    其中OIP3总为本端发射通道的非线性器件的总输出三阶交调点，PTX为本端射频发射信号的功率。Wherein the total present OIP3 total output IIP3 nonlinear device transmit power P TX channel radio frequency transmit signal present terminal end.
  12. 根据权利要求10所述的装置，其特征在于，所述获取单元具体利用下述公式计算本端射频发射信号的IM3：The apparatus according to claim 10, wherein the obtaining unit specifically calculates the IM3 of the local radio frequency transmission signal by using the following formula:
    IM3＝P主-P3阶 IM3=P main- P 3 order
    其中P主为本端射频发射信号在频域上的单个主信号功率值，P3阶为本端射频发射信号在频域上的三阶失真功率值。The P main frequency is the single main signal power value of the local radio frequency transmitting signal in the frequency domain, and the P 3 order is the third order distortion power value of the local radio frequency transmitting signal in the frequency domain.
  13. 根据权利要求10所述的装置，其特征在于，所述获取单元具体利用下述公式计算本端射频发射信号的ACLR：The device according to claim 10, wherein the obtaining unit specifically calculates an ACLR of the local radio frequency transmitting signal by using the following formula:
    ACLR＝P内-P外 ACLR=P inside- P outside
    其中P内为本端射频发射信号在频域上信号带宽内总功率值，P外为本端射频发射信号在频域上信号外相同带宽的总功率值。The total power value of the signal bandwidth in the frequency domain of the local radio frequency transmitting signal in P , and the total power value of the same bandwidth outside the signal of the radio frequency transmitting signal in the frequency domain.
  14. 根据权利要求9至13任一项所述的装置，其特征在于，所述判断单元利用下述公式获得所述第一阈值：The apparatus according to any one of claims 9 to 13, wherein said judging unit obtains said first threshold value by using the following formula:
    第一阈值＝-174(dBm/Hz)+10log(BW)+NF-MarginFirst threshold = -174 (dBm / Hz) + 10log (BW) + NF-Margin
    其中，BW为信号带宽，NF为本端接收噪声系数，Margin为一常数。Among them, BW is the signal bandwidth, NF is the receiving noise coefficient of the local end, and Margin is a constant.
  15. 根据权利要求9至14任一项所述的装置，其特征在于，所述构建单元具体根据本端发射通道的放大器的输入信号和本端发射通道的放大器 的输出信号计算本端发射通道的非线性关系。The device according to any one of claims 9 to 14, wherein the building unit is specifically based on an input signal of an amplifier of the local transmitting channel and an amplifier of the local transmitting channel The output signal calculates the nonlinear relationship of the local transmit channel.
  16. 根据权利要求9至15任一项所述的装置，其特征在于，所述获取单元具体获取本端接收射频信号的自干扰功率，根据所述本端发射信号的非线性失真指标和本端接收射频信号的自干扰功率计算本端接收射频信号的带外失真功率。 The device according to any one of claims 9 to 15, wherein the acquiring unit specifically acquires self-interference power of the radio frequency signal received by the local end, according to the nonlinear distortion index of the local end transmitting signal and the local end receiving The self-interference power of the radio frequency signal calculates the out-of-band distortion power of the radio frequency signal received by the local end.
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