CN113328845B - Method and device for compensating flatness of downlink carrier - Google Patents

Method and device for compensating flatness of downlink carrier Download PDF

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CN113328845B
CN113328845B CN202010130074.2A CN202010130074A CN113328845B CN 113328845 B CN113328845 B CN 113328845B CN 202010130074 A CN202010130074 A CN 202010130074A CN 113328845 B CN113328845 B CN 113328845B
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CN113328845A (en
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王焕
马笑言
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Datang Mobile Communications Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1461—Suppression of signals in the return path, i.e. bidirectional control circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The embodiment of the invention discloses a method and a device for compensating the flatness of a downlink carrier, wherein the method for compensating the flatness of the downlink carrier comprises the following steps: acquiring feedback data of the RRU, and determining full-bandwidth frequency domain characteristics of the RRU based on the feedback data; acquiring actual frequency domain characteristics corresponding to the working bandwidth of the RRU from the full-bandwidth frequency domain characteristics; and determining a target compensation coefficient based on the actual frequency domain characteristics, and compensating the flatness of the downlink carrier wave according to the target compensation coefficient. The invention can effectively reduce the operation cost, effectively simplify the algorithm model, reduce the resource consumption and improve the flatness compensation efficiency.

Description

Method and device for compensating flatness of downlink carrier
Technical Field
The invention relates to the technical field of communication, in particular to a method and a device for compensating flatness of a downlink carrier.
Background
With the continuous development of network technology, the operating bandwidth of a Radio Remote Unit (RRU) in a base station is also developing towards a wide band. The frequency point interval on the broadband becomes larger, and how to improve the flatness of the downlink carrier becomes more important.
At this stage, flatness compensation is usually performed according to the full operating bandwidth of the RRU. Specifically, referring to fig. 1, a compensation environment may be built based on hardware devices such as a meter (e.g., a spectrometer, a comprehensive tester, or a power meter), a test PC (Personal Computer), and an RRU. Then, a compensation instruction can be sent through the test PC, and after the instrument receives the compensation instruction, the power of antenna ports of the RRUs corresponding to different frequency points in the full bandwidth is collected. Then, the meter can determine the amplitude-frequency characteristics of analog devices (including an amplifier, a filter and a mixer) in the RRU based on the antenna port power of the RRU corresponding to the different frequency points. Then, the meter can calculate the coefficient of the digital domain filter according to the amplitude-frequency characteristics of the analog devices corresponding to the different frequency points, and compensate the flatness of the analog devices, that is, perform flatness compensation on the RRU, so as to improve the flatness of the downlink carrier.
In the prior art, when the flatness compensation is performed on the RRU, a compensation environment needs to be built through hardware, and the antenna port power is collected through an instrument, the amplitude-frequency characteristic and the digital domain filter coefficient are calculated, so that hardware equipment is consumed, and the operation cost is increased to a certain extent. Meanwhile, flatness compensation is performed according to the working full bandwidth of the RRU, so that an algorithm model is complex and the resource occupancy rate is high.
Disclosure of Invention
Because the existing method has the above problems, the embodiments of the present invention provide a method and an apparatus for compensating for the flatness of a downlink carrier.
In a first aspect, an embodiment of the present invention provides a downlink carrier flatness compensation method, including:
acquiring feedback data of the RRU, and determining full-bandwidth frequency domain characteristics of the RRU based on the feedback data;
acquiring actual frequency domain characteristics corresponding to the working bandwidth of the RRU from the full-bandwidth frequency domain characteristics;
and determining a target compensation coefficient based on the actual frequency domain characteristics, and compensating the flatness of the downlink carrier wave according to the target compensation coefficient.
Optionally, the obtaining feedback data of the RRU includes:
sending a first digital domain power, and acquiring first feedback data corresponding to the first digital domain power, wherein the first feedback data is feedback data obtained by performing radio frequency front-end circuit processing on the first digital domain power to obtain a first processing signal, and performing coupling processing on the first processing signal.
Optionally, the obtaining feedback data of the RRU further includes:
and sending a second digital domain power, and acquiring second feedback data corresponding to the second digital domain power, wherein the second feedback data is feedback data obtained by performing radio frequency front-end circuit processing and filtering processing on the second digital domain power to obtain second processed data, and performing coupling processing on the second processed data.
Optionally, the determining the full-bandwidth frequency domain characteristic of the RRU based on the feedback data includes:
obtaining an average sequence of the amplitude-frequency characteristics of a first feedback link of the RRUs, wherein the average sequence of the amplitude-frequency characteristics of the first feedback link is determined based on the amplitude-frequency characteristic sequence of the feedback link corresponding to the RRUs with the preset number and the amplitude-frequency characteristic sequence corresponding to the filter component;
determining a first average power of the RRU within a preset time before the current time, and determining a full-bandwidth frequency domain characteristic of the RRU based on an average sequence of amplitude-frequency characteristics of a first feedback link of the RRU and an amplitude-frequency characteristic sequence corresponding to the first average power.
Optionally, the equation for determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristics of the first feedback link of the RRU and the amplitude-frequency characteristic sequence corresponding to the first average power is as follows:
Figure GDA0003556582900000031
wherein the content of the first and second substances,
Figure GDA0003556582900000032
wherein, X 1i Represents the amplitude-frequency characteristic sequence, X, of the ith RRU 2i Represents the amplitude-frequency characteristic sequence of the filter component, n represents the preset number of the preset RRUs,
Figure GDA0003556582900000033
average sequence, Y, representing the amplitude-frequency characteristics of the first feedback link of the RRU n Representing a sequence of amplitude-frequency characteristics, Z, corresponding to a first average power n Representing the full bandwidth frequency domain characteristics of the RRU.
Optionally, the determining full-bandwidth frequency domain characteristics of the RRU based on the feedback data includes:
obtaining an average sequence of the amplitude-frequency characteristics of a second feedback link of the RRUs, wherein the average sequence of the amplitude-frequency characteristics of the second feedback link is determined based on the amplitude-frequency characteristic sequences of the feedback links corresponding to the RRUs in the preset number;
and determining a second average power of the RRU within a preset time before the current time, and determining the full-bandwidth frequency domain characteristic of the RRU based on an average sequence of the amplitude-frequency characteristics of a second feedback link of the RRU and an amplitude-frequency characteristic sequence corresponding to the second average power.
Optionally, the equation for determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristics of the second feedback link of the RRU and the amplitude-frequency characteristic sequence corresponding to the second average power is as follows:
Figure GDA0003556582900000034
wherein the content of the first and second substances,
Figure GDA0003556582900000041
wherein, X i The amplitude-frequency characteristic sequence of the ith RRU is represented, n represents the preset number of the preset RRUs,
Figure GDA0003556582900000042
average sequence, Y, representing the amplitude-frequency characteristics of the second feedback link of the RRU n Representing a sequence of amplitude-frequency characteristics corresponding to a second average power, Z n Representing the full bandwidth frequency domain characteristics of the RRU.
Optionally, the determining a target compensation coefficient based on the actual frequency domain characteristic includes:
and performing fast Fourier transform on the actual frequency domain characteristic to generate frequency domain response of a digital domain filter, and determining the target compensation coefficient based on the frequency domain response.
In a second aspect, an embodiment of the present invention further provides a downlink carrier flatness compensation apparatus, including a frequency domain characteristic determining unit, a frequency domain characteristic obtaining unit, and a flatness compensation unit, where:
the frequency domain characteristic determining unit is used for acquiring feedback data of the RRU and determining the full-bandwidth frequency domain characteristic of the RRU based on the feedback data;
the frequency domain characteristic obtaining unit is configured to obtain an actual frequency domain characteristic corresponding to a working bandwidth of the RRU from the full-bandwidth frequency domain characteristic;
and the flatness compensation unit is used for determining a target compensation coefficient based on the actual frequency domain characteristics and compensating the flatness of the downlink carrier wave according to the target compensation coefficient.
Optionally, the frequency domain characteristic determining unit is configured to:
sending a first digital domain power, and acquiring first feedback data corresponding to the first digital domain power, wherein the first feedback data is feedback data obtained by performing radio frequency front-end circuit processing on the first digital domain power to obtain a first processing signal, and performing coupling processing on the first processing signal.
Optionally, the frequency domain characteristic determining unit is configured to:
and sending a second digital domain power, and acquiring second feedback data corresponding to the second digital domain power, wherein the second feedback data is feedback data obtained by performing radio frequency front-end circuit processing and filtering processing on the second digital domain power to obtain second processed data, and performing coupling processing on the second processed data.
Optionally, the frequency domain characteristic determining unit is further configured to:
obtaining an average sequence of the amplitude-frequency characteristics of a first feedback link of the RRUs, wherein the average sequence of the amplitude-frequency characteristics of the first feedback link is determined based on the amplitude-frequency characteristic sequence of the feedback link corresponding to the RRUs with the preset number and the corresponding amplitude-frequency characteristic sequence of the filter component;
determining a first average power of the RRU within a preset time before the current time, and determining a full-bandwidth frequency domain characteristic of the RRU based on an average sequence of amplitude-frequency characteristics of a first feedback link of the RRU and an amplitude-frequency characteristic sequence corresponding to the first average power.
Optionally, the equation for determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristic of the first feedback link of the RRU and the sequence of the amplitude-frequency characteristic corresponding to the first average power is as follows:
Figure GDA0003556582900000051
wherein the content of the first and second substances,
Figure GDA0003556582900000052
wherein, X 1i Represents the amplitude-frequency characteristic sequence, X, of the ith RRU 2i Representing the amplitude-frequency characteristic sequence of the filtering component, n representing the preset number of RRUs,
Figure GDA0003556582900000053
average sequence, Y, representing the amplitude-frequency characteristics of the first feedback link of the RRU n Representing a sequence of amplitude-frequency characteristics, Z, corresponding to a first average power n Representing the full bandwidth frequency domain characteristics of the RRU.
Optionally, the frequency domain characteristic determining unit is further configured to:
obtaining an average sequence of the amplitude-frequency characteristics of a second feedback link of the RRUs, wherein the average sequence of the amplitude-frequency characteristics of the second feedback link is determined based on the amplitude-frequency characteristic sequence of the feedback link corresponding to the RRUs with the preset number;
and determining a second average power of the RRU within a preset time before the current time, and determining the full-bandwidth frequency domain characteristic of the RRU based on an average sequence of the amplitude-frequency characteristics of a second feedback link of the RRU and an amplitude-frequency characteristic sequence corresponding to the second average power.
Optionally, the equation for determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristic of the second feedback link of the RRU and the sequence of the amplitude-frequency characteristic corresponding to the second average power is as follows:
Figure GDA0003556582900000061
wherein the content of the first and second substances,
Figure GDA0003556582900000062
wherein, X i The amplitude-frequency characteristic sequence of the ith RRU is represented, n represents the preset number of the preset RRUs,
Figure GDA0003556582900000063
average sequence, Y, representing the amplitude-frequency characteristics of the second feedback link of the RRU n Is shown asSequence of amplitude-frequency characteristics corresponding to an average power, Z n Representing the full bandwidth frequency domain characteristics of the RRU.
Optionally, the flatness compensation unit is configured to:
and performing fast Fourier transform on the actual frequency domain characteristic to generate frequency domain response of a digital domain filter, and determining the target compensation coefficient based on the frequency domain response.
As can be seen from the foregoing technical solutions, in the embodiments of the present invention, the full-bandwidth frequency domain characteristic of the RRU is determined based on the feedback data of the RRU, the actual frequency domain bandwidth corresponding to the operating bandwidth of the RRU is obtained from the full-bandwidth frequency domain characteristic, and the target compensation coefficient is determined based on the actual frequency domain characteristic, so as to compensate the flatness of the downlink carrier according to the target compensation coefficient. Therefore, on the one hand, the flatness compensation process of the downlink carrier does not need to build a compensation environment through hardware, and does not need to execute the compensation process through an instrument, so that the consumption of hardware equipment can be effectively reduced, and the operation cost is effectively reduced. On the other hand, the target compensation coefficient is determined only according to the actual frequency domain characteristic corresponding to the working bandwidth of the RRU, namely flatness compensation is performed according to the working bandwidth of the RRU, compared with flatness compensation based on the working full bandwidth, the flatness compensation method has the advantages that an algorithm model can be effectively simplified, resource consumption can be effectively reduced, and accordingly flatness compensation efficiency is improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a compensation environment according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for compensating flatness of a downlink carrier according to an embodiment of the present invention;
fig. 3 is a diagram of a downlink according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a downlink according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a downlink carrier flatness compensation apparatus according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The main execution body of the downlink carrier flatness compensation method provided by the embodiment of the present invention may be an RRU, and the RRU may include an FPGA (Field Programmable Gate Array), a coupler, a feedback link, and an RFADC (radio frequency analog-to-digital converter). The FPGA may be configured to send a data source (e.g., digital domain power), the coupler may be configured to obtain feedback data of the RRU (e.g., obtain the feedback data from an input end of a duplexer or an output end of the duplexer in the RRU), the feedback link may perform frequency mixing processing on the feedback data, and the RFADC may perform analog-to-digital conversion on the feedback data after the frequency mixing processing.
Fig. 2 shows a schematic flow chart of a downlink carrier flatness compensation method provided in this embodiment, including:
s201, obtaining feedback data of the RRU, and determining the full-bandwidth frequency domain characteristic of the RRU based on the feedback data.
The full-bandwidth frequency domain characteristic of the RRU refers to a corresponding frequency domain characteristic of the RRU under the full bandwidth.
In implementation, when the RRU is produced, the full-bandwidth frequency domain characteristic of the RRU can be determined through the feedback data of the RRU, the actual frequency domain characteristic corresponding to the working bandwidth of the RRU is obtained from the full-bandwidth frequency domain characteristic, and the compensation coefficient of the digital domain filter in the RRU is determined according to the actual frequency domain characteristic, so as to compensate the flatness of the downlink carrier based on the compensation coefficient. Specifically, first, feedback data of the RRU (i.e., feedback data of a downlink of the RRU) may be obtained, and referring to fig. 3 or fig. 4, the feedback data may be obtained by coupling data output by a PA (Power Amplifier) or a duplexer, and the feedback data may be used to determine a full-bandwidth frequency-domain characteristic of the RRU during operation of the RRU.
And S202, acquiring actual frequency domain characteristics corresponding to the working bandwidth of the RRU from the full-bandwidth frequency domain characteristics.
Wherein, the actual frequency domain characteristic refers to a frequency domain characteristic corresponding to the working bandwidth of the RRU.
In implementation, after the full-bandwidth frequency domain characteristic of the RRU is determined, the operating bandwidth of the RRU may be determined, and the actual frequency domain characteristic corresponding to the operating bandwidth of the RRU may be obtained from the full-bandwidth frequency domain characteristic. If the working bandwidth BW of the RRU is 160MHZ, the working frequency point is 2515MHz-2675MHz, the carrier establishment takes 2545MHZ as a central frequency point, and the BW is 60MHZ, the frequency domain characteristics of the 2515MHZ-2575MHZ section can be obtained from the full-bandwidth frequency domain characteristics.
S203, determining a target compensation coefficient based on the actual frequency domain characteristics, and compensating the flatness of the downlink carrier wave according to the target compensation coefficient.
The target compensation coefficient refers to a coefficient determined based on the actual frequency domain characteristic, and it can be understood that, since flatness compensation is usually performed by adjusting a filter coefficient of a digital filter, the target compensation coefficient may actually be a compensation coefficient of the digital filter in the RRU.
In implementation, after the actual frequency domain characteristic corresponding to the operating bandwidth of the RRU is obtained, a target compensation coefficient may be calculated based on the actual frequency domain characteristic corresponding to the operating bandwidth of the RRU, and flatness compensation may be performed on the RRU according to the target compensation coefficient, that is, flatness of a downlink carrier may be compensated based on the target compensation coefficient.
As can be seen from the foregoing technical solutions, in the embodiments of the present invention, the full-bandwidth frequency domain characteristic of the RRU is determined based on the feedback data of the RRU, the actual frequency domain bandwidth corresponding to the operating bandwidth of the RRU is obtained from the full-bandwidth frequency domain characteristic, and the target compensation coefficient is determined based on the actual frequency domain characteristic, so as to compensate the flatness of the downlink carrier according to the target compensation coefficient. Therefore, on the one hand, the flatness compensation process of the downlink carrier does not need to build a compensation environment through hardware, and does not need to execute the compensation process through an instrument, so that the consumption of hardware equipment can be effectively reduced, and the operation cost is effectively reduced. On the other hand, the target compensation coefficient is determined only according to the actual frequency domain characteristic corresponding to the working bandwidth of the RRU, namely flatness compensation is performed according to the working bandwidth of the RRU, compared with flatness compensation based on the working full bandwidth, the flatness compensation method has the advantages that an algorithm model can be effectively simplified, resource consumption can be effectively reduced, and accordingly flatness compensation efficiency is improved.
Further, on the basis of the above method embodiment, the first feedback data after the rf front-end circuit processing and the coupling processing may be obtained, and the corresponding part of the processing in step S201 may be as follows: and sending the first digital domain power, and acquiring first feedback data corresponding to the first digital domain power.
The first feedback data is feedback data obtained by performing radio frequency front end circuit processing on the first digital domain power to obtain a first processing signal and performing coupling processing on the first processing signal.
The radio frequency front-end circuit processing may include at least digital-to-analog conversion and amplification processing.
The first processing signal is a signal obtained after the radio frequency front-end circuit processing is carried out on the first digital domain power.
In implementation, referring to fig. 3, the digital domain power (which may be referred to as a first digital domain power) may be sent by the FPGA, and the downlink may perform rf front-end circuit processing on the first digital domain power to obtain a first processing signal, and perform coupling processing on the first processing signal to obtain first feedback data. Specifically, first, the first digital domain power may be received by the DAC, and an analog small signal (which may be referred to as a first analog small signal) may be obtained by performing digital-to-analog conversion on the first digital domain power. Then, the first analog small signal may be subjected to mixing filtering processing through an RF (Radio Frequency) transmission link. Then, the first analog small signal after the frequency mixing filtering processing may be amplified to obtain a first processed signal, the first processed signal is obtained through the coupler, and the first processed signal is coupled to obtain first feedback data. In this way, the feedback data processed by the RRU downlink is obtained, so that the actual frequency domain characteristic determined based on the feedback data is more accurate, and thus, the target compensation coefficient determined based on the feedback data is more accurate, and the flatness compensation efficiency and accuracy can be further improved.
Further, on the basis of the above method embodiment, the second feedback data after the rf front-end circuit processing and the filtering processing may be acquired, and the corresponding partial processing of step S201 may be as follows: and sending the second digital domain power, and acquiring second feedback data corresponding to the second digital domain power.
The second feedback data is feedback data obtained by performing radio frequency front-end circuit processing and filtering processing on the second digital domain power to obtain second processed data and performing coupling processing on the second processed data.
The second processed data refers to data obtained after radio frequency front-end circuit processing and filtering processing are carried out on the second digital domain power.
In implementation, referring to fig. 4, the digital domain power (which may be referred to as a second digital domain power) may be sent by the FPGA, and the downlink may perform rf front-end circuit processing and filtering processing on the second digital domain power to obtain second processed data, and perform coupling processing on the second processed data to obtain second feedback data. Specifically, first, the second digital domain power may be received by the DAC, and the analog small signal (which may be referred to as a second analog small signal) may be obtained by performing digital-to-analog conversion on the second digital domain power. Then, the second analog small signal may be subjected to mixing filtering processing through an RF (Radio Frequency) transmission link. Then, the second analog small signal after the mixing filtering processing may be amplified and filtered through a duplexer to obtain second processed data. Then, the coupler may obtain the second processed data, and perform coupling processing on the second processed data to obtain second feedback data. In this way, the obtained second feedback data of the RRU downlink is filtered by the duplexer, and the accuracy of the actual frequency domain characteristic corresponding to the RRU operating bandwidth can be further improved, so that the target compensation coefficient determined based on the feedback data can be more accurate, and the flatness compensation efficiency and accuracy can be further improved.
Further, on the basis of the above method embodiment, when the first feedback data is obtained, the full-bandwidth frequency domain characteristic may be determined based on an average sequence of amplitude-frequency characteristics of a first feedback link of the RRU and an amplitude-frequency characteristic sequence corresponding to the first average power, and corresponding processing may be as follows: obtaining an average sequence of the amplitude-frequency characteristics of a first feedback link of the RRU; determining a first average power of the RRU within a preset time before the current time, and determining the full-bandwidth frequency domain characteristic of the RRU based on an average sequence of the amplitude-frequency characteristic of a first feedback link of the RRU and an amplitude-frequency characteristic sequence corresponding to the first average power.
The average sequence of the amplitude-frequency characteristics of the first feedback link is determined based on the amplitude-frequency characteristic sequence of the feedback link corresponding to the preset number of RRUs and the amplitude-frequency characteristic sequence corresponding to the filtering component.
The first feedback link amplitude-frequency characteristic refers to the amplitude-frequency characteristic of the feedback link from the coupler to the FPGA shown in fig. 3.
The amplitude-frequency characteristic sequence corresponding to the filtering component refers to the amplitude-frequency characteristic sequence corresponding to the duplexer shown in fig. 3.
The formula for determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristic of the first feedback link of the RRU and the amplitude-frequency characteristic sequence corresponding to the first average power is as follows:
Figure GDA0003556582900000111
wherein the content of the first and second substances,
Figure GDA0003556582900000112
wherein, X 1i Represents the amplitude-frequency characteristic sequence, X, of the ith RRU 2i Representing the amplitude-frequency characteristic sequence of the filter component, n representing the preset of the RRUThe number of the devices is set up,
Figure GDA0003556582900000113
average sequence, Y, representing the amplitude-frequency characteristics of the first feedback link of the RRU n Representing a sequence of amplitude-frequency characteristics, Z, corresponding to a first average power n Representing the full bandwidth frequency domain characteristics of the RRU.
In implementation, after the first feedback data is obtained, a feedback link corresponding to the RRU may be determined, and may determine an average sequence of the RRU first feedback link amplitude-frequency characteristics based on the aforementioned first feedback data, the average sequence of the amplitude-frequency characteristics of the first feedback link can be determined based on the amplitude-frequency characteristic sequence of the feedback link corresponding to a preset number of RRUs and the amplitude-frequency characteristic sequence corresponding to the filtering component, if flatness values corresponding to a preset number of preset RRUs can be obtained (the flatness value is calculated based on feedback data), an amplitude-frequency characteristic sequence corresponding to each preset RRU is generated based on each flatness, and an amplitude-frequency characteristic sequence corresponding to the filtering component (e.g., duplexer), and an average sequence of the amplitude-frequency characteristics of the first feedback link may be generated based on the preset number, the amplitude-frequency characteristic sequence corresponding to each preset RRU, and the amplitude-frequency characteristic sequence corresponding to the filtering component. Then, the average power (which may be referred to as a first average power) of the RRU in a certain time period (which may be referred to as a preset time period, such as 3 seconds) before the current time may be determined. Then, the full-bandwidth frequency domain characteristic of the RRU may be determined based on the average sequence of the amplitude-frequency characteristics of the first feedback link of the RRU and the amplitude-frequency characteristic sequence of the first average power. In this way, since the first feedback data is not subjected to filtering processing, when the average sequence of the amplitude-frequency characteristics of the first feedback link is determined, the amplitude-frequency characteristic sequence corresponding to the filtering component is considered, and the downlink flatness value is calculated based on the feedback data, so that the influence of the feedback link can be eliminated, the accuracy of the determined full-bandwidth frequency domain characteristics can be further improved, the accuracy of the target compensation coefficient can be further improved, and the accuracy of the downlink carrier flatness compensation can be further improved.
Referring to fig. 3, the flatness of the "feedback link" of the ith RRU can be measured using a vector networkObtaining the sequence X of the amplitude-frequency characteristic of the ith RRU by the degree index 1i And flatness of the filter assembly (duplexer) obtaining a sequence X of the amplitude-frequency characteristics of the filter assembly 2i (ii) a The feedback link mainly comprises a coupler and a mixer, and the structure is simple, so that the flatness index of the feedback circuit is better, and the consistency among different devices is also better; the duplexer is a downlink passive device, has a simple structure, and has better index consistency among different devices.
Specifically, firstly, n (that is, a preset number, n is greater than or equal to 3) RRU devices (which may be called as preset RRUs) may be sampled and measured to obtain an average sequence of the amplitude-frequency characteristics of the feedback link and the duplexer:
Figure GDA0003556582900000131
the averaged sequence may then be imported into an EEPROM (Electrically erasable programmable read only memory). Under the condition that the selected device of the preset RRU product is fixed, the gain flatness sequences of couplers and feedback links of a plurality of preset RRUs can be directly tested by using a vector network to obtain
Figure GDA0003556582900000132
If the amplitude-frequency characteristic sequence corresponding to the 3-second average power P03S counted by the FPGA is Y n Then, then
Figure GDA0003556582900000133
Wherein Z is n Is the full bandwidth frequency domain characteristic of the RRU. The method for testing the gain flatness is not limited to the use of vector nets, and can also calculate a theoretical value according to the device datasheet (device data).
Further, the first feedback data may be used to perform an OPD (Output power detector), so that the OPD power of the RRU may be determined first through the first feedback data of the RRU, and then the full-bandwidth frequency domain characteristic of the RRU may be determined based on the OPD power. Specifically, the process of determining the OPD power may be as follows: first, the FPGA may send data sources at fixed periods, which may be single tone signals, such as digital domain power; the fixed period may be BW/N, where BW (Bandwidth, interface Bandwidth) represents a working Bandwidth of an RRU downlink, N may be flexibly set according to BW, for example, 10 may be set, and the larger N is, the more accurate the target compensation coefficient of the finally determined digital domain filter is, and the higher flatness accuracy is. Then, the OPD power corresponding to each data source and the rated power of the RRU downlink can be determined. Then, taking the rated power as a reference, performing normalization processing on the OPD power to obtain an amplitude-frequency characteristic sequence (i.e. full-bandwidth frequency domain characteristic) corresponding to the RRU under the full bandwidth; or, the power corresponding to the central frequency point of the RRU downlink may also be obtained, and the power corresponding to the central frequency point is used as a reference to perform normalization processing on the OPD power, so as to obtain an amplitude-frequency characteristic sequence (i.e., a full-bandwidth frequency domain characteristic) corresponding to the RRU under the full bandwidth. It is understood that the foregoing process of determining the OPD power corresponding to the data source may be: sending digital domain power (a plurality of digital domain power) by the FPGA, converting the digital domain power by a DAC to obtain an analog small signal, performing frequency mixing filtering on the analog small signal, amplifying the analog small signal by a PA (power amplifier), sending the amplified analog small signal to a duplexer for filtering processing, and then transmitting the signal; feedback data is acquired at the output end of the duplexer (or acquired at the output end of the PA), converted into digital domain power through the RFADC after passing through a feedback link, and sent to the FPGA, and the FPGA carries out statistics on the feedback power (namely the OPD power) so as to determine the OPD power corresponding to the data source.
Specifically, the OPD power may be calculated by adding the first feedback link gain and the filtering gain of the duplexer to the 3-second average power counted by the FPGA, and the corresponding formula may be as follows:
OPD＝PO3S-Gfixopd+Gfil
wherein the OPD represents the OPD power of the RRU; PO3S is the 3 second average power (i.e. the first average power) fed back by the OPD counted by the FPGA, and is converted into dBFS by the driver; gfixopd is the OPD feedback link gain (i.e., the first feedback link gain, which is a negative value and includes the gain of the coupler); gfil is the duplexer gain (i.e., the filter gain, which is a non-positive value).
Further, on the basis of the above method embodiment, when the second feedback data is obtained, the full-bandwidth frequency domain characteristic of the RRU may be determined based on the average sequence of the amplitude-frequency characteristics of the second feedback link and the amplitude-frequency characteristic sequence corresponding to the second average power, and the corresponding processing may be as follows: obtaining an average sequence of the amplitude-frequency characteristics of a second feedback link of the RRU; and determining a second average power of the RRU within a preset time before the current time, and determining the full-bandwidth frequency domain characteristic of the RRU based on an average sequence of the amplitude-frequency characteristic of a second feedback link of the RRU and an amplitude-frequency characteristic sequence corresponding to the second average power.
The average sequence of the amplitude-frequency characteristics of the second feedback link is determined based on the amplitude-frequency characteristic sequence of the feedback link corresponding to the preset number of RRUs;
the second feedback link amplitude-frequency characteristic refers to the amplitude-frequency characteristic of the feedback link from the coupler to the FPGA shown in fig. 4.
The formula for determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristic of the second feedback link of the RRU and the amplitude-frequency characteristic sequence corresponding to the second average power is as follows:
Figure GDA0003556582900000141
wherein the content of the first and second substances,
Figure GDA0003556582900000151
wherein, X i Representing the amplitude-frequency characteristic sequence of the ith RRU, n representing the preset number of the preset RRUs,
Figure GDA0003556582900000152
average sequence, Y, representing the amplitude-frequency characteristics of the second feedback link of the RRU n Representing a sequence of amplitude-frequency characteristics corresponding to a second average power, Z n Representing the full bandwidth frequency domain characteristics of the RRU.
In implementation, after the second feedback data is obtained, a feedback link corresponding to the RRU may be determined, and an average sequence of amplitude-frequency characteristics of the second feedback link corresponding to the feedback link may be determined, where the average sequence of amplitude-frequency characteristics of the second feedback link is determined based on the amplitude-frequency characteristic sequences of the feedback links corresponding to a preset number of RRUs, and if a flatness value corresponding to a preset number of preset RRUs is obtained (calculation of the flatness value is based on the feedback data), an amplitude-frequency characteristic sequence corresponding to each preset RRU is generated based on each flatness. Then, an average sequence of the amplitude-frequency characteristics of the second feedback link may be generated based on the aforementioned preset number and the amplitude-frequency characteristic sequence corresponding to each preset RRU. Then, the average power (which may be referred to as a second average power) of the RRU in a preset time period before the current time may be determined. Then, the full-bandwidth frequency domain characteristic of the RRU may be determined based on the average sequence of the amplitude-frequency characteristics of the second feedback link of the RRU and the amplitude-frequency characteristic sequence corresponding to the second average power. In this way, because the second feedback data is subjected to filtering processing, the filtering gain does not need to be acquired when the full-bandwidth frequency domain characteristic is determined, and the downlink flatness value is calculated by taking the feedback data as a reference, so that the influence of a feedback link can be eliminated, the accuracy of the full-bandwidth frequency domain characteristic can be ensured, the processing time consumption can be reduced, and the flatness compensation efficiency can be further improved.
Referring to fig. 4, the flatness index of the "feedback link" of the ith RRU may be measured using a vector network to obtain a sequence X of the amplitude-frequency characteristic of the ith RRU i The feedback link mainly comprises a coupler and a mixer, and the structure is simple, so that the flatness index of the feedback circuit is good, and the consistency among different devices is good.
Specifically, firstly, after n (n is greater than or equal to 3) RRU devices are sampled and measured, an average sequence of the amplitude-frequency characteristics of the feedback link is obtained:
Figure GDA0003556582900000161
then, the sequence can be imported into EEPROM, i.e. Gfixopd amplitude-frequency characteristic sequence is
Figure GDA0003556582900000162
If the amplitude-frequency characteristic sequence corresponding to the 3-second average power P03S counted by the FPGA is Y n Then, then
Figure GDA0003556582900000163
Wherein Z is n Is the full bandwidth frequency domain characteristic of the RRU.
Further, the second feedback data may also be used for performing OPD, so that the OPD power of the RRU may be determined first through the second feedback data of the RRU, and then the full-bandwidth frequency domain characteristic of the RRU may be determined based on the OPD power. Specifically, the process of determining the OPD power may be as follows: and adding the 3 second average power counted by the FPGA to the second feedback link gain to calculate the OPD power, wherein a corresponding formula can be as follows:
OPD＝PO3S-Gfixopd
wherein the OPD represents the OPD power of the RRU; PO3S is the 3 second average power (i.e. the second average power) fed back by the OPD counted by the FPGA, and is converted into dBFS by the driver; gfixopd is the OPD feedback link gain (i.e. the second feedback link gain, which is a negative value, including the gain of the coupler).
Further, on the basis of the above method embodiment, the target compensation coefficient may be determined by fast fourier transform, and the corresponding processing of step S203 may be as follows: and performing fast Fourier transform on the actual frequency domain characteristics to generate the frequency domain response of the digital domain filter, and determining a target compensation coefficient based on the frequency domain response.
In implementation, after determining an actual frequency domain characteristic corresponding to the operating bandwidth of the RRU, IFFT (Inverse Fast Fourier Transform) may be performed on the actual frequency domain characteristic to obtain a frequency domain response of the digital domain filter. Then, a target compensation coefficient may be determined based on the frequency domain response, so as to adjust the RRU based on the target compensation coefficient, thereby implementing flatness compensation of the RRU downlink carrier. In this way, the target compensation coefficient is calculated based on the IFFT, and the operation speed can be further increased, thereby further improving the flatness compensation efficiency.
In particular, the phase information may be added based on real-time frequency domain characteristics (Zn),constructing a N-point complex sequence P n . Then, can be to P n Carrying out IFFT operation of N points to obtain frequency domain response Z n '. Thereafter, an N-order complex FIR (finite Impulse response) filter may be constructed in the digital domain with Z n The filter operation is performed on IQ (inphase quadrature) signals as coefficients of an FIR filter, and the operation result is a target compensation coefficient:
Z’ n ＝IFFT(P n )
fig. 5 shows a downlink carrier flatness compensation apparatus provided in this embodiment, which includes a frequency domain characteristic determining unit 501, a frequency domain characteristic obtaining unit 502, and a flatness compensation unit 503, where:
the frequency domain characteristic determining unit 501 is configured to obtain feedback data of an RRU, and determine a full-bandwidth frequency domain characteristic of the RRU based on the feedback data;
the frequency domain characteristic obtaining unit 502 is configured to obtain an actual frequency domain characteristic corresponding to a working bandwidth of the RRU from the full-bandwidth frequency domain characteristic;
the flatness compensation unit 503 is configured to determine a target compensation coefficient based on the actual frequency domain characteristic, and compensate the flatness of the downlink carrier according to the target compensation coefficient.
Further, the frequency domain characteristic determining unit 501 is configured to:
sending a first digital domain power, and acquiring first feedback data corresponding to the first digital domain power, wherein the first feedback data is feedback data obtained by performing radio frequency front-end circuit processing on the first digital domain power to obtain a first processing signal, and performing coupling processing on the first processing signal.
Further, the frequency domain characteristic determining unit 501 is configured to:
and sending a second digital domain power, and acquiring second feedback data corresponding to the second digital domain power, wherein the second feedback data is feedback data obtained by performing radio frequency front-end circuit processing and filtering processing on the second digital domain power to obtain second processed data, and performing coupling processing on the second processed data.
Further, the frequency domain characteristic determining unit 501 is further configured to:
obtaining an average sequence of the amplitude-frequency characteristics of a first feedback link of the RRUs, wherein the average sequence of the amplitude-frequency characteristics of the first feedback link is determined based on the amplitude-frequency characteristic sequences of feedback links corresponding to a preset number of RRUs and the corresponding amplitude-frequency characteristic sequences of the filter components;
determining a first average power of the RRU within a preset time before the current time, and determining a full-bandwidth frequency domain characteristic of the RRU based on an average sequence of amplitude-frequency characteristics of a first feedback link of the RRU and an amplitude-frequency characteristic sequence corresponding to the first average power.
Further, the formula for determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristic of the first feedback link of the RRU and the sequence of the amplitude-frequency characteristic corresponding to the first average power is as follows:
Figure GDA0003556582900000181
wherein the content of the first and second substances,
Figure GDA0003556582900000182
wherein, X 1i Represents the amplitude-frequency characteristic sequence, X, of the ith RRU 2i Representing the amplitude-frequency characteristic sequence of the filtering component, n representing the preset number of RRUs,
Figure GDA0003556582900000183
average sequence, Y, representing the amplitude-frequency characteristics of the first feedback link of the RRU n Representing a sequence of amplitude-frequency characteristics corresponding to a first average power, Z n Representing the full bandwidth frequency domain characteristics of the RRU.
Further, the frequency domain characteristic determining unit 501 is configured to:
obtaining an average sequence of the amplitude-frequency characteristics of a second feedback link of the RRUs, wherein the average sequence of the amplitude-frequency characteristics of the second feedback link is determined based on the amplitude-frequency characteristic sequence of the feedback link corresponding to the RRUs with the preset number;
and determining a second average power of the RRU within a preset time before the current time, and determining the full-bandwidth frequency domain characteristic of the RRU based on an average sequence of the amplitude-frequency characteristics of a second feedback link of the RRU and an amplitude-frequency characteristic sequence corresponding to the second average power.
Further, the formula for determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristic of the second feedback link of the RRU and the amplitude-frequency characteristic sequence corresponding to the second average power is as follows:
Figure GDA0003556582900000191
wherein the content of the first and second substances,
Figure GDA0003556582900000192
wherein, X i Representing the amplitude-frequency characteristic sequence of the ith RRU, n representing the preset number of the preset RRUs,
Figure GDA0003556582900000193
average sequence, Y, representing the amplitude-frequency characteristics of the second feedback link of the RRU n Representing a sequence of amplitude-frequency characteristics corresponding to a second average power, Z n Representing the full bandwidth frequency domain characteristics of the RRU.
Further, the flatness compensation unit 503 is configured to:
and performing fast Fourier transform on the actual frequency domain characteristic to generate frequency domain response of a digital domain filter, and determining the target compensation coefficient based on the frequency domain response.
The downlink carrier flatness compensation apparatus described in this embodiment may be used to implement the above method embodiments, and the principle and technical effect are similar, which are not described herein again.
The above-described embodiments of the apparatus are merely illustrative, and 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 modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
It should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (14)

1. A downlink carrier flatness compensation method is characterized by comprising the following steps:
acquiring feedback data of the RRU, and determining full-bandwidth frequency domain characteristics of the RRU based on the feedback data;
acquiring actual frequency domain characteristics corresponding to the working bandwidth of the RRU from the full-bandwidth frequency domain characteristics;
determining a target compensation coefficient based on the actual frequency domain characteristics, and compensating the flatness of the downlink carrier wave according to the target compensation coefficient;
the obtaining feedback data of the RRU and determining the full-bandwidth frequency domain characteristics of the RRU based on the feedback data comprise:
if the obtained feedback data of the RRU is first feedback data, determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristic of a first feedback link of the RRU and the amplitude-frequency characteristic sequence corresponding to the first average power;
the average sequence of the amplitude-frequency characteristics of the first feedback link is determined based on the amplitude-frequency characteristic sequences of the feedback links corresponding to a preset number of RRUs and the amplitude-frequency characteristic sequence corresponding to the filter component, and the first average power is the average power of the RRUs within a preset time before the current time.
2. The downlink carrier flatness compensation method of claim 1, wherein the obtained feedback data of the RRU is first feedback data; the acquiring feedback data of the RRU includes:
sending a first digital domain power, and acquiring first feedback data corresponding to the first digital domain power, wherein the first feedback data is feedback data obtained by performing radio frequency front-end circuit processing on the first digital domain power to obtain a first processing signal, and performing coupling processing on the first processing signal.
3. The downlink carrier flatness compensation method of claim 1, wherein the obtaining feedback data of the RRU further comprises:
and sending a second digital domain power, and acquiring second feedback data corresponding to the second digital domain power, wherein the second feedback data is feedback data obtained by performing radio frequency front-end circuit processing and filtering processing on the second digital domain power to obtain second processed data, and performing coupling processing on the second processed data.
4. The downlink carrier flatness compensation method of claim 1, wherein the equation for determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristic of the first feedback link of the RRU and the amplitude-frequency characteristic sequence corresponding to the first average power is as follows:
Figure FDA0003556582890000021
wherein the content of the first and second substances,
Figure FDA0003556582890000022
wherein, X 1i Represents the amplitude-frequency characteristic sequence, X, of the ith RRU 2i Representing the amplitude-frequency characteristic sequence of the filtering component, n representing the preset number of RRUs,
Figure FDA0003556582890000023
average sequence, Y, representing the amplitude-frequency characteristics of the first feedback link of the RRU n Representing a sequence of amplitude-frequency characteristics corresponding to a first average power, Z n Representing the full bandwidth frequency domain characteristics of the RRU.
5. The downlink carrier flatness compensation method of claim 3, wherein the determining the full-bandwidth frequency domain characteristics of the RRU based on the feedback data comprises:
obtaining an average sequence of the amplitude-frequency characteristics of a second feedback link of the RRUs, wherein the average sequence of the amplitude-frequency characteristics of the second feedback link is determined based on the amplitude-frequency characteristic sequences of the feedback links corresponding to the RRUs with the preset number;
and determining a second average power of the RRU within a preset time before the current time, and determining the full-bandwidth frequency domain characteristic of the RRU based on an average sequence of the amplitude-frequency characteristics of a second feedback link of the RRU and an amplitude-frequency characteristic sequence corresponding to the second average power.
6. The downlink carrier flatness compensation method of claim 5, wherein the equation for determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristic of the second feedback link of the RRU and the amplitude-frequency characteristic sequence corresponding to the second average power is as follows:
Figure FDA0003556582890000031
wherein the content of the first and second substances,
Figure FDA0003556582890000032
wherein, X i Representing the amplitude-frequency characteristic sequence of the ith RRU, n representing the preset number of the preset RRUs,
Figure FDA0003556582890000033
average sequence, Y, representing the amplitude-frequency characteristics of the second feedback link of the RRU n Representing a sequence of amplitude-frequency characteristics corresponding to a second average power, Z n Representing the full bandwidth frequency domain characteristics of the RRU.
7. The method according to claim 1, wherein the determining a target compensation coefficient based on the actual frequency domain characteristic includes:
and performing fast Fourier transform on the actual frequency domain characteristic to generate frequency domain response of a digital domain filter, and determining the target compensation coefficient based on the frequency domain response.
8. A downlink carrier flatness compensation device is characterized by comprising a frequency domain characteristic determining unit, a frequency domain characteristic obtaining unit and a flatness compensation unit, wherein:
the frequency domain characteristic determining unit is used for acquiring feedback data of the RRU and determining the full-bandwidth frequency domain characteristic of the RRU based on the feedback data;
the frequency domain characteristic obtaining unit is configured to obtain an actual frequency domain characteristic corresponding to a working bandwidth of the RRU from the full-bandwidth frequency domain characteristic;
the flatness compensation unit is configured to determine a target compensation coefficient based on the actual frequency domain characteristic, and compensate the flatness of the downlink carrier according to the target compensation coefficient;
the frequency domain characteristic determination unit is further configured to:
if the obtained feedback data of the RRU is first feedback data, determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristic of a first feedback link of the RRU and the amplitude-frequency characteristic sequence corresponding to the first average power;
the average sequence of the amplitude-frequency characteristics of the first feedback link is determined based on the amplitude-frequency characteristic sequences of the feedback links corresponding to a preset number of RRUs and the amplitude-frequency characteristic sequence corresponding to the filter component, and the first average power is the average power of the RRUs within a preset time before the current time.
9. The downlink carrier flatness compensation apparatus of claim 8, wherein the frequency domain characteristic determining unit is configured to:
sending a first digital domain power, and acquiring first feedback data corresponding to the first digital domain power, wherein the first feedback data is feedback data obtained by performing radio frequency front-end circuit processing on the first digital domain power to obtain a first processing signal, and performing coupling processing on the first processing signal.
10. The downlink carrier flatness compensation apparatus of claim 8, wherein the frequency domain characteristic determining unit is configured to:
and sending a second digital domain power, and acquiring second feedback data corresponding to the second digital domain power, wherein the second feedback data is feedback data obtained by performing radio frequency front-end circuit processing and filtering processing on the second digital domain power to obtain second processed data, and performing coupling processing on the second processed data.
11. The downlink carrier flatness compensation apparatus of claim 8, wherein the equation for determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristic of the first feedback link of the RRU and the sequence of the amplitude-frequency characteristic corresponding to the first average power is as follows:
Figure FDA0003556582890000041
wherein the content of the first and second substances,
Figure FDA0003556582890000042
wherein, X 1i Represents the amplitude-frequency characteristic sequence, X, of the ith RRU 2i Representing the amplitude-frequency characteristic sequence of the filtering component, n representing the preset number of RRUs,
Figure FDA0003556582890000043
average sequence, Y, representing the amplitude-frequency characteristics of the first feedback link of the RRU n Representing a sequence of amplitude-frequency characteristics, Z, corresponding to a first average power n Representing the full bandwidth frequency domain characteristics of the RRU.
12. The downlink carrier flatness compensation apparatus of claim 10, wherein the frequency domain characteristic determining unit is further configured to:
obtaining an average sequence of the amplitude-frequency characteristics of a second feedback link of the RRUs, wherein the average sequence of the amplitude-frequency characteristics of the second feedback link is determined based on the amplitude-frequency characteristic sequence of the feedback link corresponding to the RRUs with the preset number;
and determining a second average power of the RRU within a preset time before the current time, and determining the full-bandwidth frequency domain characteristic of the RRU based on an average sequence of the amplitude-frequency characteristics of a second feedback link of the RRU and an amplitude-frequency characteristic sequence corresponding to the second average power.
13. The downlink carrier flatness compensation apparatus of claim 12, wherein the equation for determining the full-bandwidth frequency domain characteristic of the RRU based on the average sequence of the amplitude-frequency characteristic of the second feedback link of the RRU and the sequence of the amplitude-frequency characteristic corresponding to the second average power is as follows:
Figure FDA0003556582890000051
wherein the content of the first and second substances,
Figure FDA0003556582890000052
wherein, X i Representing the amplitude-frequency characteristic sequence of the ith RRU, n representing the preset number of the preset RRUs,
Figure FDA0003556582890000053
average sequence, Y, representing the amplitude-frequency characteristics of the second feedback link of the RRU n Representing a sequence of amplitude-frequency characteristics corresponding to a second average power, Z n Representing the full bandwidth frequency domain characteristics of the RRU.
14. The downlink carrier flatness compensation apparatus of claim 8, wherein the flatness compensation unit is configured to:
and performing fast Fourier transform on the actual frequency domain characteristic to generate frequency domain response of a digital domain filter, and determining the target compensation coefficient based on the frequency domain response.
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