WO2014114170A1 - 一种预失真系数的更新方法和系统 - Google Patents

一种预失真系数的更新方法和系统 Download PDF

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Publication number
WO2014114170A1
WO2014114170A1 PCT/CN2013/090886 CN2013090886W WO2014114170A1 WO 2014114170 A1 WO2014114170 A1 WO 2014114170A1 CN 2013090886 W CN2013090886 W CN 2013090886W WO 2014114170 A1 WO2014114170 A1 WO 2014114170A1
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Prior art keywords
signal
predistortion
power
parameter
coefficient
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PCT/CN2013/090886
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English (en)
French (fr)
Inventor
熊军
段滔
孙华荣
肖鹏
王策
王杰丽
Original Assignee
大唐移动通信设备有限公司
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Application filed by 大唐移动通信设备有限公司 filed Critical 大唐移动通信设备有限公司
Priority to US14/760,710 priority Critical patent/US9445375B2/en
Priority to EP13872950.4A priority patent/EP2938034B1/en
Publication of WO2014114170A1 publication Critical patent/WO2014114170A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/18TPC being performed according to specific parameters
    • H04W52/24TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F1/00Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F1/00Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3247Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F1/00Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3258Modifications of amplifiers to reduce non-linear distortion using predistortion circuits based on polynomial terms
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F3/00Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189High frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F3/00Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • H03F3/245Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/02Transmitters
    • H04B1/04Circuits
    • H04B1/0475Circuits with means for limiting noise, interference or distortion
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006Arrangements for removing intersymbol interference
    • H04L25/03343Arrangements at the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/38Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40Transmitting circuits; Receiving circuits
    • H04L25/49Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/06TPC algorithms
    • H04W52/16Deriving transmission power values from another channel
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/52TPC using AGC [Automatic Gain Control] circuits or amplifiers
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F2201/00Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
    • H03F2201/32Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
    • H03F2201/3233Adaptive predistortion using lookup table, e.g. memory, RAM, ROM, LUT, to generate the predistortion

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a method and system for updating pre-distortion coefficients. Background technique
  • Digital Pre-DistortiON is a predistortion process based on a memory polynomial. After the predistortion processing, the predistortion signal is usually determined by using the predistortion coefficient and the input signal together. For the training of the pre-distortion coefficient, the method of storing the training sequence at the base station is usually used, and is transmitted according to a certain period.
  • the training sequence is not service data
  • the periodic transmission training sequence will seriously interfere with the users in the cell.
  • the real-time gather signal is required to perform pre-distortion coefficient training.
  • the adjacent channel power ratio (ACPR) of the processed signal is relatively poor, which may seriously interfere with the neighboring cell.
  • the present application provides a method and system for switching pre-distortion coefficients to solve the problem of poor pre-distortion coefficients interfering with neighboring cells.
  • a method for switching pre-distortion coefficients including: a preset primary table and a standby table, wherein a primary table stores default pre-distortion coefficients, and a spare table is used to store updated pre-precisions. Distortion coefficient
  • the parameter output processing is performed by using the updated predistortion coefficient to obtain a predistortion parameter, and the predistortion parameter is passed through together with the input signal.
  • the predistortion processor obtains a predistortion signal
  • the data source of the predistortion processor is switched to the primary table.
  • the determining the power data of the first signal includes: determining a power parameter according to continuity of the first signal; performing fast Fourier transform on the first signal, and the power parameter The power data of the first signal is jointly determined, where the power data includes at least one of the following: adjacent channel power and adjacent channel power ratio.
  • the determining the power parameter according to the continuity of the first signal includes: detecting continuity of the first signal, and searching for a power parameter in a corresponding parameter configuration table according to the continuity phase, where
  • the power parameter includes at least one of the following: a sampling rate, a center frequency point, a number of sampling points, a number of carriers, a carrier in-band bandwidth, and a carrier transmission bandwidth.
  • performing fast Fourier transform on the first signal, and determining power data of the first signal together with the power parameter includes: calculating, according to the power parameter, a frequency band of the first signal After the denoising correction of the first signal, performing fast Fourier transform to obtain the power spectral density of each frequency point; weighting the power spectral density, and determining the useful power and neighboring of the first signal Channel power; Calculate the ratio of the useful signal power to the power of the adjacent channel signal and then take the logarithm to obtain the adjacent channel power ratio of the first signal.
  • the method further includes: using a primary table as a data source of the predistortion processor, and performing parameter output processing by using the default predistortion coefficient.
  • Predistortion parameters, and the predistortion parameters are obtained together with the input signal to obtain a predistortion signal through the predistortion processor; and the predistortion signal is obtained by the various signal processors to obtain the first signal.
  • the method further includes: performing the predistortion parameter training on the first signal to obtain an updated predistortion coefficient, and the updated pre The distortion factor is updated to the alternate table.
  • the method further includes: if the primary table is used as the data source of the predistortion processor, after updating the updated predistortion coefficient to the standby table, the data of the predistortion processor is used. The source is switched to an alternate table.
  • the updating the updated pre-distortion coefficient to the standby table includes: calculating a coefficient weighted sum of the updated pre-distortion coefficient, and when the coefficient weighting sum meets a preset condition, The updated pre-distortion coefficient is updated to the alternate table.
  • the embodiment of the present application further discloses an update system for predistortion coefficients, including: a parameter controller, a predistortion processor, various types of signal processors, an arithmetic unit, and a switching controller;
  • the parameter controller includes: an active table and an alternate table, wherein the primary table stores a default pre-distortion coefficient, and the standby table is configured to store the updated pre-distortion coefficient;
  • the parameter controller is configured to: when the data source of the predistortion processor uses the used table, use the updated predistortion coefficient to perform parameter output processing to obtain a predistortion parameter;
  • the predistortion processor is configured to obtain a predistortion signal by using the predistortion parameter together with an input signal through a predistortion processor;
  • the signal processor is configured to process the predistortion signal to obtain a first signal
  • the operator is configured to determine power data of the first signal
  • the switching controller is configured to continue to use the standby table as a data source of the predistortion processor if the power data of the first signal is greater than or equal to the set range; if the power data of the first signal is less than the set range, Switching the data source of the predistortion processor to a primary table.
  • the operator is specifically configured to determine a power parameter according to continuity of the first signal, perform fast Fourier transform on the first signal, and determine the first with the power parameter.
  • the power data of the signal where the power data includes at least one of the following: adjacent channel power and adjacent channel power ratio.
  • the computing device is configured to detect continuity of the first signal, and search for a power parameter in a corresponding parameter configuration table according to the continuity phase, where the power parameter includes at least one of the following : sample rate, center frequency point, number of samples, number of carriers, carrier in-band bandwidth And carrier transmission bandwidth.
  • the computing device is configured to calculate, according to the power parameter, frequency points of the frequency band of the first signal; after performing denoising correction on the first signal, performing fast Fourier transform to obtain each frequency a power spectral density of the point; performing weighting processing by the power spectral density, and determining a useful power of the first signal and adjacent channel power; calculating a ratio of the useful signal power to the power of the adjacent channel signal, taking a logarithm, and obtaining the first signal Adjacent channel power ratio.
  • the parameter controller is further configured to use the primary table as a data source of the predistortion processor, and use the default predistortion coefficient for parameter output processing.
  • the predistortion processor is configured to obtain the predistortion signal through the predistortion processor together with the input signal and the input signal;
  • the various signal processors are configured to predistort the predistortion The signal obtains the first signal through various signal processors.
  • the system further includes: a parameter training device configured to perform the predistortion parameter training on the first signal to obtain an updated predistortion coefficient, and update the updated predistortion coefficient to the standby table.
  • a parameter training device configured to perform the predistortion parameter training on the first signal to obtain an updated predistortion coefficient, and update the updated predistortion coefficient to the standby table.
  • the switching controller is further configured to: if the primary table is used as the data source of the predistortion processor, after updating the updated predistortion coefficient to the standby table, the predistortion processor The data source is switched to an alternate table.
  • the parameter training device is specifically configured to calculate a coefficient weighted sum of the updated pre-distortion coefficients, and update the updated pre-distortion coefficient to the standby when the coefficient weighting sum meets a preset condition table.
  • the present application includes the following advantages:
  • the embodiment of the present application presets an active table and a standby table.
  • the primary table stores a default pre-distortion coefficient
  • the spare table stores the updated pre-distortion coefficient. Therefore, when the spare table is used as the data source, the power data of the feedback first signal can be obtained after the pre-distortion processing of the updated pre-distortion coefficient.
  • the power data of the first signal may be detected. If the power data is within the set range, the standby table is further used as the data source of the predistortion processor. If the power data is not in the set range, Then, the data source of the predistortion processor is switched to the main table.
  • the first signal of the updated pre-distortion coefficient is obtained by the embodiment of the present application, so that the ACP and the ACPR of the first signal are determined by the power parameter, and then the interference of the updated pre-distortion coefficient to the neighboring cell is determined by ACP and ACPR.
  • FIG. 1 is a flowchart of a method for switching pre-distortion coefficients according to Embodiment 1 of the present application
  • FIG. 2 is a flowchart of a method for switching pre-distortion coefficients according to Embodiment 2 of the present application
  • FIG. 3 is a pre-distortion provided by Embodiment 3 of the present application.
  • FIG. 4 is a schematic diagram of a process of switching pre-distortion coefficients provided in Embodiment 3 of the present application
  • FIG. 5 is a schematic diagram of a configuration of a primary and a standby table in a process of switching pre-distortion coefficients provided in Embodiment 3 of the present application;
  • FIG. 6 is an ACPR curve diagram of a left adjacent channel in a process of switching pre-distortion coefficients provided in Embodiment 3 of the present application;
  • FIG. 8 is a structural diagram of an update system of pre-distortion coefficients provided in Embodiment 4 of the present application. detailed description
  • Digital Pre-DistortiON is a predistortion process based on memory polynomial.
  • the mathematical model can include:
  • the LUT (Look-Up-Table) is a pre-distortion parameter (DPD parameter), and the input of the LUT is determined by the quantized amplitude Q(r n , m ), specifically:
  • ) is the predistortion parameter corresponding to the input signal amplitude index.
  • Pre-distortion parameters are stored according to pre-distortion parameters, and pre-distortion parameters are extracted according to ⁇ - ) ⁇ during pre-distortion processing.
  • the pre-distortion module can calculate the pre-distortion signal.
  • the method of storing the training sequence at the base station is usually used, and is transmitted according to a certain period.
  • the training sequence is not the service data
  • the periodic transmission training sequence will seriously interfere with the users in the cell.
  • the real-time gather signal is required to train the DPD coefficients.
  • the adjacent channel power ratio (ACPR) of the processed signal is relatively poor, which may cause serious 4 neighbor cells and interfere with signals in the adjacent band.
  • the quality of the signal within the band will also deteriorate. This phenomenon will continue to improve after the PDP processing of the higher quality DPD coefficient, but it is impossible to determine when the higher quality PDP coefficient will appear. If the high quality PDP coefficient does not appear, the above problem cannot be solved. .
  • the embodiment of the present application provides a method for updating a predistortion coefficient, which can obtain a PDP processed signal of a predistortion coefficient, and detect power data of the signal, thereby selecting a predistortion coefficient according to the power data.
  • Embodiment 1
  • Step 101 preset the primary table and the standby table.
  • the default pre-distortion coefficient is stored in the main table.
  • the default pre-distortion coefficient is relatively high quality, that is, the power data of the pre-distortion signal obtained by pre-distortion processing using the default pre-distortion coefficient is relatively good, and the interference to the neighboring cell is small.
  • the default pre-distortion coefficient in the primary table is always the same, so that the primary table can be used as the data source of the pre-distortion processor at any time.
  • the arithmetic sum of the default pre-distortion coefficients can be configured to be close to 1, so that the service signal does not affect the power amplifier when passing through the pre-distortion channel.
  • the alternate table is used to store the updated pre-distortion coefficients. That is, the pre-distortion coefficient training can be performed on the first signal processed by the predistortion processor and other signal processing devices, thereby determining the predistortion coefficient and updating into the spare table, so the stored predistortion coefficient in the spare table is real time.
  • the updated, that is, the predistortion coefficient is updated every time the predistortion process is performed.
  • Step 102 When the data source of the predistortion processor uses the used table, use the updated predistortion coefficient to perform parameter output processing to obtain a predistortion parameter, and pass the predistortion parameter together with the input signal through predistortion.
  • the processor gets a predistorted signal.
  • the input signal and the updated predistortion coefficient are subjected to parameter output processing, that is, the pre-distortion parameter is obtained by using the data signal and the updated pre-distortion coefficient.
  • the predistortion parameters and input signals are then processed by a predistortion processor to obtain corresponding predistortion signals.
  • Step 103 Obtain the first signal by using the predistortion signal through various types of signal processors, and determine power data of the first signal.
  • Pre-distortion signals can be processed by various signal processors, such as digital to analog converters (DACs), power amplifiers, analog-to-digital converters (ADCs), etc. a signal.
  • DACs digital to analog converters
  • ADCs analog-to-digital converters
  • the power data of the first signal can then be calculated.
  • the power data may include: Adjacent Channel (Adjacent Channel) Power, ACP) and ACPR.
  • ACPR is an index that measures the interference of the main channel signal of the RF output signal to the adjacent frequency signal, and is also an important indicator to measure the degree of nonlinear distortion of the output signal of the power amplifier.
  • ACPR can measure the output signal of the power amplifier through the feedback channel.
  • Step 104 Detect whether the power data of the first signal is less than a set range.
  • the predistortion coefficient training is performed on the first signal to obtain an updated predistortion coefficient. If the predistortion processing is performed by using a poor predistortion coefficient, the ACPR of the subsequently obtained predistortion signal is also poor. Therefore, it will seriously interfere with neighboring cells and interfere with signals in the adjacent frequency band.
  • the superiority or inferiority of the updated pre-distortion coefficient is related to the first signal, that is, the quality of the first signal may affect the updated pre-distortion coefficient. Therefore, in order to avoid the above problem, the embodiment of the present application pre-configures the setting range of the power data for evaluating the merits of the power data. If the power data is greater than or equal to the set range, it indicates that the power data of the signal is relatively good. If the power data is smaller than the set range, the power data of the signal is relatively poor.
  • the setting range can be set to 43dBc ⁇ 48dBc.
  • the ACPR of the first signal is less than 43dBc, the ACPR is poor.
  • the ACPR of the first signal is greater than 48dBc, the ACPR is better.
  • step 106 detecting whether the power data of the first signal is less than a set range, and if not, that is, the power data of the first signal is greater than or equal to the set range, performing step 105 subsequently, if yes, that is, the power data of the first signal is less than After the range is determined, step 106 is performed subsequently.
  • Step 105 continue to use the alternate table as the data source of the predistortion processor.
  • the power data of the first signal is within the set range, it indicates that the power data of the first signal is relatively high quality, that is, the first signal is relatively high quality, and the updated pre-distortion coefficient is obtained by using the first signal.
  • the distortion factor is stored in the alternate table.
  • the updated predistortion coefficient is also good, so continue to use the spare table as the data source for the predistortion processor.
  • Step 106 Switch the data source of the predistortion processor to a primary table.
  • the power data of the first signal is not in the set range, it indicates that the power data of the first signal is relatively poor, that is, the first signal is relatively poor, and the updated pre-distortion coefficient is obtained by using the first signal.
  • the distortion factor is stored in the spare table, continue to use the alternate table as a predistortion processor.
  • the data source, the pre-distortion coefficient is relatively poor in the subsequent pre-distortion processing, so the subsequent interference to the neighboring cell, the quality of the signal in the band will deteriorate.
  • the data source of the predistortion processor should be switched to the main table.
  • the default pre-distortion coefficient in the primary table is used later.
  • the embodiment of the present application presets a primary table and a standby table, the primary table stores a default pre-distortion coefficient, and the spare table stores the updated pre-distortion coefficient. Therefore, when the spare table is used as the data source, the power data of the first signal fed back can be obtained after the pre-distortion processing of the updated pre-distortion coefficient.
  • the power data of the first signal may be detected. If the power data is within the set range, the standby table is further used as the data source of the predistortion processor. If the power data is not in the set range, Then, the data source of the predistortion processor is switched to the main table.
  • Embodiment 2 it is possible to detect the status of the power data, determine whether it causes interference to the neighboring cell, and whether the in-band signal is degraded, thereby determining the status of the real-time updated pre-distortion coefficient, and then selecting the primary meter or the backup according to the specific situation. Table to minimize interference to neighboring cells.
  • Step 201 preset the primary table and the empty standby table.
  • the default pre-distortion coefficient is stored in the primary table.
  • the spare table may be empty.
  • the pre-distortion coefficient obtained by the pre-distortion coefficient training may be updated to the standby table, thereby making the standby table
  • the predistortion coefficient can be updated in real time.
  • Step 202 The main table is used as a data source of the predistortion processor, and the default predistortion coefficient is used for parameter output processing to obtain a predistortion parameter, and the predistortion parameter and the input signal are jointly pre-distorted.
  • the processor gets a predistorted signal.
  • the spare table is empty, so the primary table can be used as the data source of the predistortion processor first, that is, the default predistortion coefficient and the input signal are used for parameter output processing, thereby obtaining the pre-depreciation parameter of this time.
  • the predistortion parameters are processed together with the input signal through a predistortion processor to obtain a predistortion signal.
  • Step 203 Obtain the first signal by using the predistortion signal through various types of signal processors.
  • Step 204 Perform pre-distortion parameter training on the first signal to obtain an updated pre-distortion coefficient, and update the updated pre-distortion coefficient to the standby table.
  • the pre-distortion coefficient training can then be performed on the first signal to obtain a pre-distortion coefficient that is updated into the alternate table as a new pre-distortion coefficient.
  • the pre-distortion coefficient training method is prior art, and details are not described herein again.
  • the updating the updated pre-distortion coefficient to the standby table includes: calculating a coefficient weighted sum of the updated pre-distortion coefficient, and when the coefficient weighting sum meets a preset condition, The updated pre-distortion coefficient is updated to the alternate table.
  • a coefficient weighted sum of the updated pre-distortion coefficient may be calculated, and the updated pre-distortion coefficient is determined according to the coefficient weighting sum, and a specific preset of the coefficient weighting sum may be configured.
  • the coefficient weighted sum is greater than, the coefficient weighted sum does not satisfy the preset condition, the updated pre-distortion coefficient is ignored, and the standby table is not updated. If the coefficient weighted sum is less than 1.3, the coefficient weighted sum satisfies a preset condition, and the updated pre-distortion coefficient is updated to the standby table.
  • Step 205 Switch the data source of the predistortion processor to a standby table.
  • the predistortion coefficient is stored in the spare table, after which the spare table can be used as the data source and the predistortion coefficient is updated by the updated predistortion coefficient in the spare table.
  • Step 206 Perform parameter output processing by using the updated pre-distortion coefficient to obtain a pre-distortion parameter, and obtain the pre-distortion signal together with the input signal through the pre-distortion processor.
  • Step 207 Obtain the first signal by using the predistortion signal through various types of signal processors.
  • Step 208 Perform pre-distortion parameter training on the first signal to obtain an updated pre-distortion coefficient, and update the updated pre-distortion coefficient to the standby table.
  • step 204 This is basically the same as step 204, and is not described here.
  • Step 209 Determine power data of the first signal.
  • the determining the power data of the first signal includes: determining a power parameter according to continuity of the first signal; performing Fast Fourier Transformation (FFT) on the first signal And determining the power data of the first signal together with the power parameter, where the power data includes at least one of the following: adjacent channel power and adjacent channel power ratio.
  • FFT Fast Fourier Transformation
  • the embodiment of the present application can detect the continuity of the first signal, such as continuous or non-continuous, and then determine the corresponding power parameter. Then, the first frequency of the corresponding first signal band of the power parameter ball, the termination frequency point, the frequency center point, and the like may be performed, and the first signal is subjected to FFT, thereby determining the power parameter of the first signal, including the ACP. And ACPR and so on.
  • Step 210 Detect whether the power data of the first signal is less than a set range.
  • step 211 is performed; if yes, that is, the power data of the first signal is less than the set range, step 212 is performed.
  • Step 211 continue to use the alternate table as a data source of the predistortion processor.
  • the spare table continues to be used as the data source of the predistortion processor.
  • Step 212 Switch the data source of the predistortion processor to a primary table.
  • the data source of the predistortion processor is switched to the main table.
  • the embodiment of the present application can obtain the updated first pre-distortion coefficient processed first signal, thereby determining the ACP and ACPR of the first signal by using the power parameter, and then determining the updated pre-distortion coefficient pair by ACP and ACPR.
  • Step 301 preset the primary table and the standby table.
  • the storage device may be used to form a primary table and a standby table, such as random storage. Random Access Memory (RAM).
  • RAM Random Access Memory
  • the spare table is used as the predistortion parameter table being updated.
  • the LUT design in digital predistortion there is M-level memory, and each level of memory factor corresponds to a set of active/standby switching devices. Therefore, the system has a total of 2*M group LUT coefficient tables (see Figure 5). The content in the LUT is switched to each other, and only the pre-distortion channel standby performance is notified. The information in the main table is always unchanged, neither updated nor cleared, and can be switched back to the main table at any time.
  • Figure 5 shows that the primary table is in use, then the standby table is in an updated state, where the predistortion coefficients are updated in real time.
  • Step 302 Use the main table as a data source of the predistortion processor.
  • Step 303 Perform parameter output processing by using the default pre-distortion coefficient to obtain a pre-distortion parameter, and obtain the pre-distortion signal through the pre-distortion processor together with the input signal.
  • the input signal is ( ), ( ⁇ -1,.. ( ⁇ - « ⁇ , at this time, the pre-distortion coefficient and the input signal in the main table are used together for parameter output processing to obtain pre-distortion.
  • the predistortion parameter is determined by the amplitude of the first signal and the predistortion coefficient.
  • the predistortion parameter and the input signal can then be used together to obtain the predistortion signal z(n) through the predistortion processor. ),z(n— , — p)
  • Step 304 Obtain the first signal by using the predistortion signal through various types of signal processors.
  • various types of signal processors include a DAC, a radio frequency (RF) channel, a power amplifier (PA), a PF receiving channel, and an ADC.
  • the predistortion signal can be sequentially passed through the DAC, the RF channel, and the PA to output an output signal, which is an output signal obtained by the predistortion processing.
  • the output signal is then passed through the PF receive channel and the ADC to obtain the first signal m).
  • Step 305 Perform pre-distortion parameter training on the first signal to obtain an updated pre-distortion coefficient, and update the updated pre-distortion coefficient to the standby table. Then, after adjusting the amplitude of the first signal, the predistortion parameter training is performed, thereby obtaining an updated predistortion coefficient>v(%>, v(L.M. Specifically, the predistortion signal can be
  • Step 306 The standby table is used as a data source of the predistortion processor.
  • the alternate table can be used as the data source of the pre-distortion processor.
  • the initial input signal uses the pre-distortion coefficient in the main table, and the real-time updated pre-distortion coefficient is stored in the spare table.
  • the predistortion coefficients in the alternate table are updated in real time.
  • the switch uses the updated alternate table, at which point the alternate table serves as the data source.
  • Step 307 Perform parameter output processing by using the updated pre-distortion coefficient to obtain a pre-distortion parameter, and obtain the pre-distortion signal through the pre-distortion processor together with the input signal.
  • step 303 This is basically the same as step 303, and will not be described again.
  • Step 308 Obtain the first signal by using the predistortion signal through various types of signal processors.
  • Step 309 Perform pre-distortion parameter training on the first signal to obtain an updated pre-distortion coefficient, and update the updated pre-distortion coefficient to the standby table.
  • the updating the updated pre-distortion coefficient to the standby table includes: calculating a coefficient weighted sum of the updated pre-distortion coefficient, and when the coefficient weighting sum meets a preset condition, The updated pre-distortion coefficient is updated to the alternate table.
  • Step 310 Determine power data of the first signal.
  • the determining the power data of the first signal includes: determining a power parameter according to continuity of the first signal; performing fast Fourier transform on the first signal, and the power parameter Determining power data of the first signal, wherein the power data includes the following One less: adjacent channel power and adjacent channel power ratio.
  • the determining the power parameter according to the continuity of the first signal includes: detecting continuity of the first signal, and searching for a power parameter in a corresponding parameter configuration table according to the continuity phase, where
  • the power parameter includes at least one of the following: a sampling rate, a center frequency point, a number of sampling points, a number of carriers, a carrier in-band bandwidth, and a carrier transmission bandwidth.
  • the first parameter configuration table may be as shown in Table 1:
  • the carrier is the first signal.
  • performing fast Fourier transform on the first signal, and determining power data of the first signal together with the power parameter includes: calculating, according to the power parameter, a frequency band of the first signal After the denoising correction of the first signal, performing fast Fourier transform to obtain the power spectral density of each frequency point; performing weighting processing by the power spectral density, and determining the useful power and neighboring of the first signal Channel power; Calculate the ratio of the useful signal power to the power of the adjacent channel signal and then take the logarithm to obtain the adjacent channel power ratio of the first signal. Specifically, the following steps are included:
  • fft_point is the number of points in the FFT
  • band_point is the number of points in the bandwidth
  • Centre_point is the number of points in the center frequency
  • sweep_point is the number of points scanned
  • dif_point is the number of points in the interval.
  • the starting frequency and the ending frequency of the frequency band of the first signal and the frequency center point can be calculated.
  • y(n) weight ⁇ n). * [y(n) - . weight2(n). * y(n)] ( 8 ) where 0 ⁇ (3 ⁇ 4 ⁇ 1.
  • Weightl and weight2 can be corrected based on the signal bandwidth and length.
  • the calibrated signal is subjected to FFT transformation, and the absolute value is taken, and then squared to obtain the power spectral density of each frequency point.
  • the in-band power of the first signal can be determined by the power spectral density of each frequency point, that is, the in-band power point of the first signal is integrated, and then divided into two cases, if the low frequency band is at the negative frequency point , the useful power (useful signal power) is calculated as:
  • weighting is performed in equations (11), (12), and (13), so that equations (14) and (15) result in weighted ACPR, if in equations (11), (12), and 13) If the weighting process is not performed, the corresponding ACPR is obtained without weighting.
  • the accuracy of the ACPR is significantly improved after the weighting algorithm is used, and the ACPR of the signal can be reflected more realistically.
  • Figures 6 and 7 for details. Among them, Figure 6 shows the ACPR of the adjacent channel, and Figure ⁇ shows the ACPR of the right adjacent channel.
  • the ACPR algorithm calculated by the ACPR algorithm using weighted denoising is very close to the test result of the frequency instrument, so the weighted denoising ACPR algorithm can accurately calculate the true condition of the signal.
  • Step 311 Detect whether the power data of the first signal is less than a set range.
  • step 306 If not, that is, if the power data of the first signal is greater than or equal to the set range, then return to step 306 to continue using the spare table as the data source of the predistortion processor; if yes, the power data of the first signal is less than the set range Then, returning to step 302, the data source of the predistortion processor is switched to the main table.
  • the input signal initially uses the predistortion coefficient in the main table, and the predistortion coefficient is stored in the spare table.
  • the predistortion coefficients in the alternate table are updated in real time.
  • the predistortion processor can be notified to use the updated spare table, at which point the alternate table becomes the data source.
  • the updated standby table is only temporarily used. Whether to continue using it or not, it is necessary to continue to observe the updated predistortion coefficient in the alternate table for signal processing. That is, the first signal of the feedback is continued, and the first signal of the feedback needs to be FFT for ACP statistics. If the ACP and ACPR are better, continue to use the standby table just completed, if the ACP, ACPR is not good, switch Go back to the original master table.
  • the primary table and the standby table are configured for switching, a set of training sequences can be saved to form a primary table when the station is started.
  • the DPD system during the subsequent LUT table update process There is a set of ready-to-use master tables.
  • the pre-distortion coefficient corresponding to the best ACPR is selected to update the spare table.
  • the updated alternate table can be obtained by the following algorithm:
  • M is the length of the memory factor, such as 4, 5, 6, etc.
  • Q is a nonlinear factor, such as 4, 5, 6, etc.
  • R is the length of the LUT table stored by the first-level memory factor, such as 256, 512, etc.
  • the first signal can be denoised and FFT processed, and the ACP and ACPR of the first signal are determined by the power parameter, and the accuracy of the determined ACP and ACPR is relatively high, so the accuracy is relatively accurate. Determine the interference of the pre-distortion coefficient to the neighboring cell, and then select the data source more accurately.
  • Embodiment 4 of the present application a structural diagram of an update system of pre-distortion coefficients provided in Embodiment 4 of the present application is shown.
  • the embodiment of the present application further provides an update system for pre-distortion coefficients, including: a parameter controller 11, a pre-distortion processor 12, various types of signal processors 13, an arithmetic unit 14, and a switching controller 15, wherein:
  • the parameter controller 11 includes: a primary table and an alternate table, wherein the primary table stores a default pre-distortion coefficient, and the spare table is configured to store the updated pre-distortion coefficient;
  • the parameter controller 11 is configured to: when the data source of the predistortion processor uses the used table, use the updated predistortion coefficient to perform parameter output processing to obtain a predistortion parameter;
  • the predistortion processor 12 is configured to obtain a predistortion signal by using the predistortion parameter together with an input signal through a predistortion processor;
  • the signal processor 13 is configured to process the predistortion signal to obtain a first signal;
  • the operator 14 is configured to determine power data of the first signal
  • the switching controller 15 is configured to continue to use the standby table as a data source of the predistortion processor if the power data of the first signal is greater than or equal to the set range; if the power data of the first signal is less than the set range, Switching the data source of the predistortion processor to a primary table
  • the computing unit 14 is configured to determine a power parameter according to continuity of the first signal, perform fast Fourier transform on the first signal, and determine the first Power data of a signal, where the power data includes at least one of the following: adjacent channel power and adjacent channel power ratio.
  • the computing device 14 is configured to detect continuity of the first signal, and search for a power parameter in the corresponding parameter configuration table according to the continuity phase, where the power parameter includes at least one of the following Items: sample rate, center frequency, number of samples, number of carriers, carrier inband bandwidth, and carrier transmission bandwidth.
  • the computing unit 14 is configured to calculate, according to the power parameter, frequency points of the frequency band of the first signal; after performing denoising correction on the first signal, performing fast Fourier transform to obtain each Power spectral density of the frequency point; weighting processing by the power spectral density, and determining the useful power and adjacent channel power of the first signal; calculating a ratio of the useful signal power to the power of the adjacent channel signal, taking a logarithm, and obtaining the first signal The adjacent channel power ratio.
  • the parameter controller 11 is further configured to use the primary table as a data source of the predistortion processor, and use the default predistortion coefficient for parameter output. Processing to obtain predistortion parameters;
  • the predistortion processor 12 is configured to obtain the predistortion signal through the predistortion processor together with the predistortion parameter and the input signal;
  • the various types of signal processors 13 are configured to obtain the first signal by using the predistortion signals through various types of signal processors.
  • the parameter trainer 16 is configured to perform the predistortion parameter training on the first signal to obtain an updated predistortion coefficient, and update the updated predistortion coefficient into the standby table.
  • the switching controller 15 is further configured to: if the primary table is used as the data source of the predistortion processor, after the updated predistortion coefficient is updated to the standby table, the predistortion processing is performed. The data source of the device is switched to an alternate table.
  • the parameter training device 16 is specifically configured to calculate a coefficient weighted sum of the updated pre-distortion coefficients, and update the updated pre-distortion coefficient to when the coefficient weighting sum meets a preset condition. Alternate table.
  • the embodiment of the present application presets a primary table and a standby table, the primary table stores a default pre-distortion coefficient, and the spare table stores the updated pre-distortion coefficient. Therefore, when the spare table is used as the data source, the power data of the first signal fed back can be obtained after the pre-distortion processing of the updated pre-distortion coefficient.
  • the power data of the first signal may be detected. If the power data is within the set range, the standby table is further used as the data source of the predistortion processor. If the power data is not in the set range, Then, the data source of the predistortion processor is switched to the main table.
  • the first signal of the updated pre-distortion coefficient is obtained by the embodiment of the present application, so that the ACP and the ACPR of the first signal are determined by the power parameter, and then the interference of the updated pre-distortion coefficient to the neighboring cell is determined by ACP and ACPR.
  • the first signal can be denoised and FFT processed, and the ACP and ACPR of the first signal are determined by the power parameter, and the accuracy of the determined ACP and ACPR is relatively high, so the predistortion coefficient pair is relatively accurately determined.
  • the interference situation of the neighboring cell, and then the data source is selected more accurately.
  • the description since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.
  • the application can be described in the general context of computer-executable instructions executed by a computer, such as a program module.
  • program modules include routines, programs, objects, components, data structures, and the like that perform particular tasks or implement particular abstract data types.
  • the present application can also be practiced in distributed computing environments where tasks are performed by remote processing devices that are connected through a communication network.
  • program modules can be located in both local and remote computer storage media including storage devices.

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Abstract

一种预失真系数切换方法和系统,以解决预失真系数较差干扰邻小区的问题。所述的方法包括:预置主用表和备用表,其中,主用表中存储默认的预失真系数,备用表用于存储更新的预失真系数;当预失真处理器的数据源采用被用表时,采用所述更新的预失真系数进行参数输出处理得到预失真参数,并将所述预失真参数与输入信号共同通过预失真处理器得到预失真信号;将所述预失真信号通过各类信号处理器得到第一信号,并确定所述第一信号的功率数据;若所述第一信号的功率数据大于或等于设定范围,则继续采用备用表作为预失真处理器的数据源;若所述第一信号的功率数据小于设定范围,则将所述预失真处理器的数据源切换成主用表。

Description

一种预失真系数的更新方法和系统
技术领域
本申请涉及通信技术领域,特别是涉及一种预失真系数的更新方法和系 统。 背景技术
数字预失真处理(DigitalPre-DistortiON, DPD )是基于记忆多项式对信 号进行预失真处理的。预失真处理后中通常是釆用预失真系数和输入信号共 同确定预失真信号。 对于预失真系数的训练, 通常釆用在基站保存训练序列 的方法, 并按照一定的周期进行发送。
但由于训练序列不是业务数据,周期性的发送训练序列会严重干扰小区 内的用户, 为此需要实时的釆集信号进行预失真系数的训练。 但是, 实时的 釆集数据时无法保证本次训练的系数是否可用,如本次训练的系数远不如上 次训练的系数。
若釆用较差的预失真系数进行预失真处理, 处理输出后的信号的邻道功 率比(Adjacent Channel Power Ratio, ACPR )比较差, 进而会严重的干扰邻 小区。 发明内容
本申请提供了一种预失真系数切换方法和系统, 以解决预失真系数较差 干扰邻小区的问题。 为了解决上述问题, 本申请公开了一种预失真系数的切换方法, 包括: 预置主用表和备用表, 其中, 主用表中存储默认的预失真系数, 备用表 用于存储更新的预失真系数;
当预失真处理器的数据源釆用被用表时,釆用所述更新的预失真系数进 行参数输出处理得到预失真参数, 并将所述预失真参数与输入信号共同通过 预失真处理器得到预失真信号;
将所述预失真信号通过各类信号处理器得到第一信号,并确定所述第 ― 信号的功率数据;
若所述第一信号的功率数据大于或等于设定范围,则继续釆用备用表作 为预失真处理器的数据源;
若所述第一信号的功率数据小于设定范围,则将所述预失真处理器的数 据源切换成主用表。
可选的, 所述确定所述第一信号的功率数据, 包括: 依据所述第一信 号的连续性确定功率参数; 对所述第一信号进行快速傅里叶变换, 并与所述 功率参数共同确定所述第一信号的功率数据, 其中, 所述功率数据包括以下 至少一项: 邻道功率和邻道功率比。
可选的, 所述依据所述第一信号的连续性确定功率参数, 包括: 检测所 述第一信号的连续性, 并依据所述连续性相查找对应参数配置表中的功率参 数, 其中, 所述功率参数包括以下至少一项: 釆样速率、 中心频点、 釆样点 数、 载波个数、 载波带内带宽和载波发送带宽。
可选的, 对所述第一信号进行快速傅里叶变换, 并与所述功率参数共同 确定所述第一信号的功率数据, 包括: 根据所述功率参数计算所述第一信号 的频带的各频点; 对第一信号进行去噪修正后, 进行快速傅里叶变换得到每 个频点的功率谱密度; 对所述功率谱密度进行加权处理, 并确定第一信号的 有用功率和邻道功率; 计算有用信号功率和邻道信号功率的比值后取对数, 得到第一信号的邻道功率比。
可选的, 若备用表预置时为空, 则所述的方法还包括: 将主用表作为所 述预失真处理器的数据源,釆用所述默认的预失真系数进行参数输出处理得 到预失真参数, 并将所述预失真参数与输入信号共同通过预失真处理器得到 预失真信号; 将所述预失真信号通过各类信号处理器得到第一信号。
可选的, 将所述预失真信号通过各类信号处理器得到第一信号之后, 还 包括: 将所述第一信号进行预失真参数训练得到更新的预失真系数, 并将所 述更新的预失真系数更新到备用表中。 可选的, 所述的方法还包括: 若将主用表作为所述预失真处理器的数据 源, 则在将更新的预失真系数更新到备用表后, 将所述预失真处理器的数据 源切换成备用表。
可选的, 所述将所述更新的预失真系数更新到备用表, 包括: 计算所述 更新的预失真系数的系数加权和, 并在所述系数加权和满足预设条件时, 将 所述更新的预失真系数更新到备用表。 相应的, 本申请实施例还公开了一种预失真系数的更新系统, 包括: 参 数控制器、 预失真处理器、 各类信号处理器、 运算器和切换控制器;
所述参数控制器中包括: 主用表、 备用表, 其中, 主用表中存储默认的 预失真系数, 备用表用于存储更新的预失真系数;
所述参数控制器, 配置为当预失真处理器的数据源釆用被用表时, 釆用 更新的预失真系数进行参数输出处理得到预失真参数;
所述预失真处理器, 配置为在将所述预失真参数与输入信号共同通过预 失真处理器得到预失真信号;
所述各类信号处理器, 配置为对所述预失真信号进行处理得到第一信 号;
所述运算器, 配置为确定所述第一信号的功率数据;
所述切换控制器, 配置为若第一信号的功率数据大于或等于设定范围, 则继续釆用备用表作为预失真处理器的数据源; 若第一信号的功率数据小于 设定范围, 则将所述预失真处理器的数据源切换成主用表。
可选的, 所述运算器, 具体配置为依据所述第一信号的连续性确定功率 参数; 对所述第一信号进行快速傅里叶变换, 并与所述功率参数共同确定所 述第一信号的功率数据, 其中, 所述功率数据包括以下至少一项: 邻道功率 和邻道功率比。
可选的, 所述运算器, 具体配置为检测所述第一信号的连续性, 并依据 所述连续性相查找对应参数配置表中的功率参数, 其中, 所述功率参数包括 以下至少一项: 釆样速率、 中心频点、 釆样点数、 载波个数、 载波带内带宽 和载波发送带宽。
可选的, 所述运算器, 具体配置为根据所述功率参数计算所述第一信号 的频带的各频点; 对第一信号进行去噪修正后, 进行快速傅里叶变换得到每 个频点的功率谱密度; 通过所述功率谱密度进行加权处理, 并确定第一信号 的有用功率和邻道功率; 计算有用信号功率和邻道信号功率的比值后取对 数, 得到第一信号的邻道功率比。
可选的, 若备用表预置时为空; 所述参数控制器, 还配置为将主用表作 为所述预失真处理器的数据源, 釆用所述默认的预失真系数进行参数输出处 理得到预失真参数; 所述预失真处理器, 配置为并将所述预失真参数与输入 信号共同通过预失真处理器得到预失真信号; 所述各类信号处理器, 配置为 将所述预失真信号通过各类信号处理器得到第一信号。
可选的, 所述的系统还包括: 参数训练器, 配置为将所述第一信号进行 预失真参数训练得到更新的预失真系数, 并将所述更新的预失真系数更新到 备用表中。
可选的, 所述切换控制器, 还配置为若将主用表作为所述预失真处理器 的数据源, 则在将更新的预失真系数更新到备用表后, 将所述预失真处理器 的数据源切换成备用表。
可选的, 所述参数训练器, 具体配置为计算所述更新的预失真系数的系 数加权和, 并在所述系数加权和满足预设条件时, 将所述更新的预失真系数 更新到备用表。 与现有技术相比, 本申请包括以下优点:
首先, 本申请实施例预置主用表和备用表, 主用表中存储默认的预失真 系数, 备用表中存储更新的预失真系数。 从而在釆用备用表作为数据源时, 对更新的预失真系数在进行预失真处理后, 可以得到反馈的第一信号的功率 数据。 本申请实施例可以对第一信号的功率数据进行检测, 若该功率数据在 设定范围内, 则继续釆用备用表作为预失真处理器的数据源, 若该功率数据 不在设定范围内, 则将所述预失真处理器的数据源切换成主用表。 从而可以 检测出功率数据的状况, 进而判断其是否对邻小区造成干扰, 带内信号是否 恶化的状况, 从而判断出实时更新的预失真系数的状况, 进而根据具体的情 况选择主用表或备用表, 以尽量减少对邻小区的干扰。
其次, 本申请实施例可以得到更新的预失真系数处理后的第一信号, 从 而通过功率参数确定第一信号的 ACP和 ACPR, 进而通过 ACP和 ACPR判 断该更新的预失真系数对邻小区的干扰状况, 以及对邻频带内信号的影响情 况, 进而确定预失真处理时的数据源为主用表或备用表。 从而可以釆用比较 优质的预失真系数进行预失真处理, 尽量减少对邻小区等的干扰。 附图说明
图 1是本申请实施例一提供的预失真系数的切换方法流程图; 图 2是本申请实施例二提供的预失真系数的切换方法流程图; 图 3是本申请实施例三提供的预失真系数的切换方法流程图; 图 4是本申请实施例三提供的预失真系数的切换处理示意图; 图 5是本申请实施例三提供的预失真系数的切换处理中主、备用表配置 示意图;
图 6是本申请实施例三提供的预失真系数的切换处理中左邻道的 ACPR 曲线图;
图 7是本申请实施例三提供的预失真系数的切换处理中右邻道的 ACPR 曲线图;
图 8是本申请实施例四提供的预失真系数的更新系统结构图。 具体实施方式
为使本申请的上述目的、 特征和优点能够更加明显易懂, 下面结合附图 和具体实施方式对本申请作进一步详细的说明。
数字预失真处理(DigitalPre-DistortiON, DPD )是基于记忆多项式对信 号进行预失真处理的, 其数学模型可以包括:
Figure imgf000008_0001
其巾:
m是输入信号的幅度: r„,m =|x("- )| , β(·): 是量化因子。
LUT (Look-Up-Table, 查找表)是预失真参数( DPD参数), 所述 LUT 的输入地 量化后的幅度 Q(rn,m )来决定, 具体的:
L UTm
Figure imgf000008_0002
- mf'l) ,m = \...M,n = \...N ( 2 ) 则 J Tm(jx("- )|)是按照输入信号幅度 为索引对应的预失真参 数。 在进行预失真更新时按照 存入预失真参数, 预失真处理时按照 \ - )\提取预失真参数。
, =1.. , =1...^是预失真系数(0?0系数),通过计算得到 W以后, 预失真模块就可以计算得到预失真信号 。
因此, 对于 DPD 系数的训练, 通常釆用在基站保存训练序列的方法, 并按照一定的周期进行发送。
但由于训练序列不是业务数据, 周期性的发送训练序列会严重干扰小区 内的用户, 为此需要实时的釆集信号进行 DPD 系数的训练。 但是, 实时的 釆集数据时无法保证本次训练的系数是否可用,如本次训练的系数远不如上 次训练的系数。
若釆用较差的 DPD系数进行 PDP处理, 处理输出后的信号的邻道功率 比(Adjacent Channel Power Ratio, ACPR)比较差, 进而会严重的干 4尤邻小 区, 并干扰邻频带内的信号, 同时带内的信号质量也将恶化。 这种现象会持 续到较优质的 DPD系数进行 PDP处理后, 才会出现改善, 但是无法确定何 时才会出现比较优质的 PDP系数, 若一直不出现优质的 PDP系数, 则上述 问题始终无法解决。
本申请实施例提供一种预失真系数的更新方法, 可以得到对预失真系数 进行 PDP处理后的信号, 并对该信号的功率数据进行检测, 从而依据所述 功率数据选择预失真系数。 实施例一
参照图 1 ,给出了本申请实施例一提供的预失真系数的切换方法流程图。 步骤 101 , 预置主用表和备用表。
其中, 主用表中存储默认的预失真系数。 所述默认的预失真系数是比较 优质的, 即釆用默认的预失真系数进行预失真处理得到的预失真信号的功率 数据比较好, 对邻小区的干扰较小。 并且, 主用表中默认的预失真系数始终 保持不变, 从而使得主用表可以随时作为预失真处理器的数据源。 具体的, 可以配置所述默认的预失真系数的算术和接近 1 , 从而业务信号通过预失真 通道时不会对功放造成影响。
备用表用于存储更新的预失真系数。 即可以将通过预失真处理器和其他 信号处理设备处理后的第一信号进行预失真系数训练, 从而确定预失真系 数, 并更新到备用表中, 因此备用表中的存储的预失真系数是实时更新的, 即每执行一次预失真处理都会对预失真系数进行更新。
步骤 102, 当预失真处理器的数据源釆用被用表时, 釆用所述更新的预 失真系数进行参数输出处理得到预失真参数, 并将所述预失真参数与输入信 号共同通过预失真处理器得到预失真信号。
釆用被用表作为预失真处理器的数据源,则将输入信号和所述更新的预 失真系数进行参数输出处理, 即釆用数据信号和更新的预失真系数得到预失 真参数。 然后将预失真参数和输入信号通过预失真处理器进行处理, 得到对 应的预失真信号。
步骤 103 , 将所述预失真信号通过各类信号处理器得到第一信号, 并确 定所述第一信号的功率数据。
可以将预失真信号通过各类信号处理器进行处理, 如通过数模转换器 ( Digital to Analog Converter, DAC ), 功率放大器, 模数转换器( Analog to Digital Converter, ADC )等, 从而可以得到第一信号。 然后可以计算该第一 信号的功率数据。
本实施例中, 所述功率数据可以包括: 邻道功率 (Adjacent Channel Power, ACP )和 ACPR等。
其中, ACPR是衡量射频输出信号的主信道信号对邻近频点信号造成干 扰而设定的指标, 也是衡量功放输出信号非线性失真程度的一个重要指标。 ACPR可通过反馈通道对功率放大器的输出信号进行测量得到。
步骤 104, 检测所述第一信号的功率数据是否小于设定范围。
本申请实施例中,对第一信号进行预失真系数训练可以得到更新的预失 真系数, 若釆用较差的预失真系数进行预失真处理, 后续得到的预失真信号 的 ACPR也会比较差, 因此会严重的干扰邻小区, 并干扰邻频带内的信号。
其中, 更新的预失真系数的优、 劣是与第一信号有关的, 即第一信号的 功率数据的优劣会影响更新的预失真系数。 因此, 为了避免出现上述问题, 本申请实施例预先配置了功率数据的设定范围, 用于对功率数据的优、 劣进 行评价。 其中, 若该功率数据大于或等于设定范围, 则说明该信号的功率数 据比较优质,若该功率数据小于设定范围,则说明该信号的功率数据比较差。
例如功率数据为 ACPR , 则设定范围可以配置为 43dBc〜48dBc, 当第一 信号的 ACPR小于 43dBc时, 说明 ACPR较差; 当第一信号的 ACPR大于 48dBc时, 说明 ACPR较优。
具体的, 检测第一信号的功率数据是否小于设定范围, 若否, 即第一信 号的功率数据大于或等于设定范围, 则后续执行步骤 105 , 若是, 即第一信 号的功率数据小于设定范围, 则后续执行步骤 106。
步骤 105 , 继续釆用备用表作为预失真处理器的数据源。
若第一信号的功率数据在设定范围内, 则说明该第一信号的功率数据比 较优质, 即第一信号是比较优质的, 釆用该第一信号进行预失真系数训练得 到的更新的预失真系数会存入备用表中, 此时更新的预失真系数也是比较优 质的, 因此继续釆用备用表作为预失真处理器的数据源。
步骤 106, 将所述预失真处理器的数据源切换成主用表。
若第一信号的功率数据不在设定范围内, 则说明该第一信号的功率数据 比较差, 即第一信号是比较差的, 釆用该第一信号进行预失真系数训练得到 的更新的预失真系数会存入备用表后, 若继续釆用备用表作为预失真处理器 的数据源, 后续进行预失真处理时预失真系数是比较差的, 因此后续会对邻 小区造成干扰, 带内的信号质量会恶化。
因此, 在此种情况下应该将所述预失真处理器的数据源切换成主用表。 后续釆用主用表中默认的预失真系数。
综上所述, 本申请实施例预置主用表和备用表, 主用表中存储默认的预 失真系数, 备用表中存储更新的预失真系数。 从而在釆用备用表作为数据源 时, 对更新的预失真系数在进行预失真处理后, 可以得到反馈的第一信号的 功率数据。 本申请实施例可以对第一信号的功率数据进行检测, 若该功率数 据在设定范围内, 则继续釆用备用表作为预失真处理器的数据源, 若该功率 数据不在设定范围内, 则将所述预失真处理器的数据源切换成主用表。 从而 可以检测出功率数据的状况, 进而判断其是否对邻小区造成干扰, 带内信号 是否恶化的状况, 从而判断出实时更新的预失真系数的状况, 进而根据具体 的情况选择主用表或备用表, 以尽量减少对邻小区的干扰。 实施例二
参照图 2,给出了本申请实施例二提供的预失真系数的切换方法流程图。 步骤 201 , 预置主用表和空的备用表。
主用表中存储默认的预失真系数, 此时备用表可以为空, 后续可以将预 失真处理后, 通过预失真系数训练得到的预失真系数更新到该备用表中, 从 而使得备用表中的预失真系数可以进行实时更新。
步骤 202, 将主用表作为所述预失真处理器的数据源, 釆用所述默认的 预失真系数进行参数输出处理得到预失真参数, 并将所述预失真参数与输入 信号共同通过预失真处理器得到预失真信号。
备用表为空, 因此首先可以釆用主用表作为预失真处理器的数据源, 即 釆用默认的预失真系数和输入信号进行参数输出处理,从而得到本次的预失 真参数。 再将预失真参数与输入信号共同通过预失真处理器进行处理, 进而 可以得到预失真信号。
步骤 203 , 将所述预失真信号通过各类信号处理器得到第一信号。 步骤 204,将所述第一信号进行预失真参数训练得到更新的预失真系数, 并将所述更新的预失真系数更新到备用表中。
然后可以对第一信号进行预失真系数训练,从而得到预失真系数作为更 新的预失真系数更新到备用表中。 其中, 预失真系数训练方法是现有技术, 此处不再赘述。
可选的, 所述将所述更新的预失真系数更新到备用表, 包括: 计算所述 更新的预失真系数的系数加权和, 并在所述系数加权和满足预设条件时, 将 所述更新的预失真系数更新到备用表。
本申请实施例中, 可以计算所述更新的预失真系数的系数加权和, 并依 据所述系数加权和确定所述更新的预失真系数的优、 劣, 具体的可以配置系 数加权和的预设条件, 以衡量更新的预失真系数的优、 劣。 例如, 所述预设 条件为 系数加权和小于 1.3 , 并假设更新的预失真 系数是 wm ,m = \...M,q = \...Q ^则系数加权和就是 。然后检测所述系数加权和是 否满足于预设条件, 若系数加权和大于 , 则系数加权和不满足预设条件, 则忽略该更新的预失真系数, 不对备用表进行更新。 若系数加权和小于 1.3 , 则系数加权和满足预设条件, 则所述更新的预失真系数更新到备用表中。
步骤 205 , 将所述预失真处理器的数据源切换成备用表。
将更新的预失真系数更新到备用表后, 备用表中存储了预失真系数, 此 后可以将备用表作为数据源, 釆用备用表中更新的预失真系数进行预失真处 理。
步骤 206, 釆用所述更新的预失真系数进行参数输出处理得到预失真参 数, 并将所述预失真参数与输入信号共同通过预失真处理器得到预失真信 号。
步骤 207, 将所述预失真信号通过各类信号处理器得到第一信号。
步骤 208,将所述第一信号进行预失真参数训练得到更新的预失真系数, 并将所述更新的预失真系数更新到备用表中。
此处与步骤 204基本一致, 此处不再赘述。
步骤 209, 确定所述第一信号的功率数据。 可选的, 所述确定所述第一信号的功率数据, 包括: 依据所述第一信号 的连续性确定功率参数; 对所述第一信号进行快速傅里叶变换(Fast Fourier Transformation, FFT ), 并与所述功率参数共同确定所述第一信号的功率数 据, 其中, 所述功率数据包括以下至少一项: 邻道功率和邻道功率比。
本申请实施例可以检测第一信号的连续性,如是连续的,或是非连续的, 然后确定对应的功率参数。 然后可以通过所述功率参数球的对应的第一信号 频带的起始频点、 终止频点和频率中心点等, 并对第一信号进行 FFT, 从而 可以确定第一信号的功率参数, 包括 ACP和 ACPR等。
步骤 210, 检测所述第一信号的功率数据是否小于设定范围。
若否, 即所述第一信号的功率数据大于或等于设定范围, 则执行步骤 211 ; 若是, 即所述第一信号的功率数据小于设定范围, 则执行步骤 212。
步骤 211 , 继续釆用备用表作为预失真处理器的数据源。
若第一信号的功率数据在设定范围内, 则继续釆用备用表作为预失真处 理器的数据源。
步骤 212, 将所述预失真处理器的数据源切换成主用表。
若第一信号的功率数据不在设定范围内, 则将所述预失真处理器的数据 源切换成主用表。
综上所述, 本申请实施例可以得到更新的预失真系数处理后的第一信 号, 从而通过功率参数确定第一信号的 ACP和 ACPR, 进而通过 ACP和 ACPR判断该更新的预失真系数对邻小区的干扰状况, 以及对邻频带内信号 的影响情况, 进而确定预失真处理时的数据源为主用表或备用表。 从而可以 釆用比较优质的预失真系数进行预失真处理, 尽量减少对邻小区等的干扰。 实施例三
参照图 3 ,给出了本申请实施例三提供的预失真系数的切换方法流程图。 参照图 4,给出了本申请实施例三提供的预失真系数的切换处理示意图。 步骤 301 , 预置主用表和备用表。
本实施例中, 可以釆用存储设备构成主用表和备用表, 如釆用随机存储 器(Random Access Memory, RAM )。 可以通过切换控制器控制主、 备用表 的切换以及数据的分发。
本实施例中, 主用表作为正在应用的预失真参数表时, 备用表作为正在 更新的预失真参数表。 对于数字预失真中的 LUT设计, 有 M级记忆, 每一 级记忆因子都对应一组主备切换装置, 所以系统一共有 2*M组 LUT系数表 格(参见图 5 ), 主备切换并不进行 LUT中的内容相互倒换, 仅仅通知预失 真通道备用表现在使用,主用表中的信息始终保持不变,既不更新也不清零, 可以随时切换回主用表。
图 5中显示主用表正在使用, 则此时备用表处于更新状态, 即其中的预 失真系数被实时更新。
若备用表为空, 则进入步骤 302; 若备用表非空, 则进入步骤 306。 步骤 302, 釆用主用表作为所述预失真处理器的数据源。
步骤 303 , 釆用所述默认的预失真系数进行参数输出处理得到预失真参 数, 并将所述预失真参数与输入信号共同通过预失真处理器得到预失真信 号。
本实施例中, 4叚设输入信号为 ( ), (^-1,.. (^-«^, 此时釆用主用表中 的预失真系数和输入信号共同进行参数输出处理得到预失真参数, 具体的, 参照公式(2 )预失真参数是由第一信号的幅度和预失真系数共同决定的。 然后可以将预失真参数与输入信号共同通过预失真处理器得到预失真信号 z(n),z(n— , — p)
步骤 304, 将所述预失真信号通过各类信号处理器得到第一信号。
本实施例中, 各类信号处理器包括 DAC、 射频(Radio Frequency, RF ) 通道、 功率放大器(Power Amplifier, PA )、 PF接收通道和 ADC等。
具体的, 可以将预失真信号依次通过 DAC、 RF通道和 PA从而得打输 出信号, 作为本次预失真处理得到的输出信号。 然后将输出信号通过 PF接 收通道和 ADC得到第一信号 m)。
步骤 305,将所述第一信号进行预失真参数训练得到更新的预失真系数, 并将所述更新的预失真系数更新到备用表中。 然后对第一信号的幅度进行调整后, 进行预失真参数训练, 从而得到更 新的预失真系数 >v(%>, v( L. M 。 具体的, 可以对预失真信号
7, 7- . . . 7 - W进行延时, 然后与幅度调整后的第一信号共同进行预失 真参数训练得到更新的预失真系数。 然后可以计算所述更新的预失真系数的 系数加权和, 并在所述系数加权和满足预设条件时, 将更新的预失真系数
>v( ( L. M 更新的备用表中。 其中, 预失真参数训练是现有技术, 本申 请实施例不再赘述。
步骤 306, 釆用所述备用表作为所述预失真处理器的数据源。
釆用备用表中默认的预失真系数进行预失真处理后,后续可以釆用备用 表作为预失真处理器的数据源。
本实施例中, 初始时输入信号使用主用表中的预失真系数, 实时更新的 预失真系数存入备用表中。 主用表被预失真器使用时, 备用表中的预失真系 数被实时更新。 当备用表被更新完成之后, 切换使用更新后的备用表, 此时 备用表作为数据源。
步骤 307 , 釆用所述更新的预失真系数进行参数输出处理得到预失真参 数, 并将所述预失真参数与输入信号共同通过预失真处理器得到预失真信 号。
此处与步骤 303基本一致, 不再赘述。
步骤 308 , 将所述预失真信号通过各类信号处理器得到第一信号。
步骤 309,将所述第一信号进行预失真参数训练得到更新的预失真系数, 并将所述更新的预失真系数更新到备用表中。
可选的, 所述将所述更新的预失真系数更新到备用表, 包括: 计算所述 更新的预失真系数的系数加权和, 并在所述系数加权和满足预设条件时, 将 所述更新的预失真系数更新到备用表。
步骤 310, 确定所述第一信号的功率数据。
可选的, 所述确定所述第一信号的功率数据, 包括: 依据所述第一信号 的连续性确定功率参数; 对所述第一信号进行快速傅里叶变换, 并与所述功 率参数共同确定所述第一信号的功率数据, 其中, 所述功率数据包括以下至 少一项: 邻道功率和邻道功率比。
可选的, 所述依据所述第一信号的连续性确定功率参数, 包括: 检测所 述第一信号的连续性, 并依据所述连续性相查找对应参数配置表中的功率参 数, 其中, 所述功率参数包括以下至少一项: 釆样速率、 中心频点、 釆样点 数、 载波个数、 载波带内带宽和载波发送带宽。
若第一信号是连续信号且带宽一致,则第一参数配置表可以如表 1所示:
Figure imgf000016_0002
表 1
其中, 所述载波即第一信号。
可选的, 对所述第一信号进行快速傅里叶变换, 并与所述功率参数共同 确定所述第一信号的功率数据, 包括: 根据所述功率参数计算所述第一信号 的频带的各频点; 对第一信号进行去噪修正后, 进行快速傅里叶变换得到每 个频点的功率谱密度; 通过所述功率谱密度进行加权处理, 并确定第一信号 的有用功率和邻道功率; 计算有用信号功率和邻道信号功率的比值后取对 数, 得到第一信号的邻道功率比。 具体包括如下步骤:
首先, 根据釆样速率和 FFT-SIZE求得每一个 MHZ对应的釆样点数: fft _ point ( 3 )
Figure imgf000016_0001
band po int - fft _ po int* carrier band
centre po int - fft _ po int* centre freq
( 4 ) sweep po int - fft— po int* sweep band
dif po int - sweep po int- band po int
其中, fft_point 为 FFT 的釆样点数、 band_point 为带宽的釆样点数、 centre_point 为中心频点的釆样点数、 sweep_point 为扫描的釆样点数、 dif_point为间隔的釆样点数。
再根据功率参数可以计算出第一信号的频带的起始频点和终止频点以 及频率中心点。
centre _ po int = modd _ size + centre _ freq, fft _ size) ( 5 )
Figure imgf000017_0001
mo _size + centre _po int- max carrier sweep _po int + i po int , —size) right _po int - ( 7 ) mod(ffi _size + centre _po int+ max carrier * sweep _po int 12 + dif po int 12, ffi—size) 信号 在求功率之前为了使得 ACPR计算更加准确,可以先进行去噪 爹正处理。
y(n) = weight\ n). * [y(n) - . weight2(n). * y(n)] ( 8 ) 其中 0≤(¾≤1。
weightl和 weight2可以根据信号带宽, 长度不断修正得到。
对校准后的信号进行 FFT变换后取绝对值,再求平方,得到每一个频率 点的功率谱密度。
carr _freq{n) - ^FFT^y n)1^ η=1' ' -fft— size (9) 整个频带内总功率
n二 l''*fft— size ( 10 )
Figure imgf000017_0002
通过每个频率点的功率谱密度可以确定第一信号的带内功率,也就是对 第一信号的带内功率点求取积分, 此时又分为两种情况, 如果低频段在负频 率点, 此时有用功率(有用信号功率)计算为:
signal _pow - ^ carr _freq{n) ( 11 ) 左邻道功率 (左邻道信号功率):
ac left pow - ^ carr freq{n) ( 12) 右邻道功率 (右邻道信号功率):
ac right pow - ^ carr _freq n) ( 13 ) 计算有用信号功率和邻道信号功率的比值, 然后取对数得到 ACPR: 履 . iogl m n ) ac _ lejt _ pow
ACPRng^ 10. logw ( ) ( 15 ) ac _ right _ pow
其中, 公式(11 )、 (12 )和(13 ) 中进行了加权处理, 从而公式(14 ) 和( 15 )得到的是加权处理后的 ACPR, 若在公式( 11 )、 ( 12 )和( 13 ) 中 不进行加权处理, 则对应得到的就是不进行加权处理的 ACPR。
具体实施中, 釆用加权算法后 ACPR的准确度明显提高, 能够比较真实 的反映出信号的 ACPR情况, 具体参见图 6和 7。 其中, 图 6为左邻道的 ACPR, 图 Ί为右邻道的 ACPR。
其中,釆用加权去噪的 ACPR算法对反馈信号计算得到的 ACPR数值非 常接近频语仪器的测试结果,故此加权去噪的 ACPR算法能够精确的计算出 信号的真实情况。
步骤 311 , 检测所述第一信号的功率数据是否小于设定范围。
若否, 即若第一信号的功率数据大于或等于设定范围,则返回步骤 306, 继续釆用备用表作为预失真处理器的数据源; 若是, 即第一信号的功率数据 小于设定范围, 则返回步骤 302, 将所述预失真处理器的数据源切换成主用 表。
输入信号初始使用主用表中的预失真系数, 预失真系数存入备用表中。 主用 LUT被高速预失真器使用的时候, 备用表中的预失真系数被实时更新。 当备用表被更新完成之后, 可以通知预失真处理器使用更新后的备用表, 此 时备用表成为数据源。 此时更新后的备用表只是临时被使用, 是否继续使用 还需要继续观察备用表中更新的预失真系数进行信号处理的效果。也就是继 续釆集反馈的第一信号, 对反馈的第一信号需要作 FFT进行 ACP的统计, 如果 ACP, ACPR较好,则继续使用刚更新完成的备用表,如果 ACP, ACPR 不好则切换回原来的主用表。
本申请实施例中, 由于配置了主用表和备用表进行切换, 为此开机建站 时可以保存一组训练序列构成主用表。 再以后的 LUT表更新过程中 DPD系 统中就有一组随时可用的主用表。
本实施例中, 为了观测 ACPR的变化趋势,可以保存多组 ACPR的数值 ACPR(1),...ACPR(L), 如果 ACPR持续恶化, 则需要切换回主用表。
如果 ACPR持续恶化, 则选择一组最好的 ACPR对应的预失真系数, 来 更新备用表。
只要保存了预失真系数, 通过如下算法就可以得到更新后的备用表:
e .―,、
L UTm {r) = A- jwm q
Figure imgf000019_0001
- Qjq } r = l"..R w = .M 其中, M是记忆因子的长度, 如可以取 4, 5, 6等。 Q是非线性的因子, 如可以取 4, 5, 6等。 R是一级记忆因子存储的 LUT表的长度, 如可以般 取 256 , 512 等。 Q 是量化因子, 等于系统能够保存的最大信号 /R, 如 Q=32768/R, 如果 R=512, 那么 Q=64。
因此只要保存预失真系数就可以快速完成备用表的更新。
综上所述, 本实施例中, 可以对第一信号进行去噪和 FFT处理, 并通过 功率参数确定第一信号的 ACP和 ACPR, 确定的 ACP和 ACPR的准确性比 较高, 因此比较准确的确定预失真系数对邻小区的干扰情况, 进而比较准确 的选择数据源。 实施例四
参照图 8 ,给出了本申请实施例四提供的预失真系数的更新系统结构图。 相应的, 本申请实施例还提供了一种预失真系数的更新系统, 包括: 参 数控制器 11、 预失真处理器 12、 各类信号处理器 13、运算器 14和切换控制 器 15, 其中:
所述参数控制器 11 中包括: 主用表、 备用表, 其中, 主用表中存储默 认的预失真系数, 备用表用于存储更新的预失真系数;
所述参数控制器 11 , 配置为当预失真处理器的数据源釆用被用表时,釆 用更新的预失真系数进行参数输出处理得到预失真参数;
所述预失真处理器 12,配置为在将所述预失真参数与输入信号共同通过 预失真处理器得到预失真信号; 所述各类信号处理器 13 ,配置为对所述预失真信号进行处理得到第一信 号;
所述运算器 14, 配置为确定所述第一信号的功率数据;
所述切换控制器 15 , 配置为若第一信号的功率数据大于或等于设定范 围, 则继续釆用备用表作为预失真处理器的数据源; 若第一信号的功率数据 小于设定范围, 则将所述预失真处理器的数据源切换成主用表
可选的,所述运算器 14,具体配置为依据所述第一信号的连续性确定功 率参数; 对所述第一信号进行快速傅里叶变换, 并与所述功率参数共同确定 所述第一信号的功率数据, 其中, 所述功率数据包括以下至少一项: 邻道功 率和邻道功率比。
可选的, 所述运算器 14, 具体配置为检测所述第一信号的连续性, 并依 据所述连续性相查找对应参数配置表中的功率参数, 其中, 所述功率参数包 括以下至少一项: 釆样速率、 中心频点、 釆样点数、 载波个数、 载波带内带 宽和载波发送带宽。
可选的,所述运算器 14,具体配置为根据所述功率参数计算所述第一信 号的频带的各频点; 对第一信号进行去噪修正后, 进行快速傅里叶变换得到 每个频点的功率谱密度; 通过所述功率谱密度进行加权处理, 并确定第一信 号的有用功率和邻道功率; 计算有用信号功率和邻道信号功率的比值后取对 数, 得到第一信号的邻道功率比。
可选的, 若备用表预置时为空; 所述参数控制器 11 , 还配置为将主用表 作为所述预失真处理器的数据源,釆用所述默认的预失真系数进行参数输出 处理得到预失真参数;
所述预失真处理器 12,配置为并将所述预失真参数与输入信号共同通过 预失真处理器得到预失真信号;
所述各类信号处理器 13 ,配置为将所述预失真信号通过各类信号处理器 得到第一信号。
可选的,参数训练器 16,配置为将所述第一信号进行预失真参数训练得 到更新的预失真系数, 并将所述更新的预失真系数更新到备用表中。 可选的,所述切换控制器 15 ,还配置为若将主用表作为所述预失真处理 器的数据源, 则在将更新的预失真系数更新到备用表后, 将所述预失真处理 器的数据源切换成备用表。
可选的,所述参数训练器 16,具体配置为计算所述更新的预失真系数的 系数加权和, 并在所述系数加权和满足预设条件时, 将所述更新的预失真系 数更新到备用表。
综上所述, 本申请实施例预置主用表和备用表, 主用表中存储默认的预 失真系数, 备用表中存储更新的预失真系数。 从而在釆用备用表作为数据源 时, 对更新的预失真系数在进行预失真处理后, 可以得到反馈的第一信号的 功率数据。 本申请实施例可以对第一信号的功率数据进行检测, 若该功率数 据在设定范围内, 则继续釆用备用表作为预失真处理器的数据源, 若该功率 数据不在设定范围内, 则将所述预失真处理器的数据源切换成主用表。 从而 可以检测出功率数据的状况, 进而判断其是否对邻小区造成干扰, 带内信号 是否恶化的状况, 从而判断出实时更新的预失真系数的状况, 进而根据具体 的情况选择主用表或备用表, 以尽量减少对邻小区的干扰。
其次, 本申请实施例可以得到更新的预失真系数处理后的第一信号, 从 而通过功率参数确定第一信号的 ACP和 ACPR, 进而通过 ACP和 ACPR判 断该更新的预失真系数对邻小区的干扰状况, 以及对邻频带内信号的影响情 况, 进而确定预失真处理时的数据源为主用表或备用表。 从而可以釆用比较 优质的预失真系数进行预失真处理, 尽量减少对邻小区等的干扰。
本实施例中,可以对第一信号进行去噪和 FFT处理, 并通过功率参数确 定第一信号的 ACP和 ACPR, 确定的 ACP和 ACPR的准确性比较高, 因此 比较准确的确定预失真系数对邻小区的干扰情况,进而比较准确的选择数据 源。 对于系统实施例而言, 由于其与方法实施例基本相似, 所以描述的比较 简单, 相关之处参见方法实施例的部分说明即可。
本说明书中的各个实施例均釆用递进的方式描述,每个实施例重点说明 的都是与其他实施例的不同之处,各个实施例之间相同相似的部分互相参见 即可。
本申请可以在由计算机执行的计算机可执行指令的一般上下文中描述, 例如程序模块。 一般地, 程序模块包括执行特定任务或实现特定抽象数据类 型的例程、 程序、 对象、 组件、 数据结构等等。 也可以在分布式计算环境中 实践本申请, 在这些分布式计算环境中, 由通过通信网络而被连接的远程处 理设备来执行任务。 在分布式计算环境中, 程序模块可以位于包括存储设备 在内的本地和远程计算机存储介质中。
最后, 还需要说明的是, 在本文中, 诸如第一和第二等之类的关系术语 仅仅用来将一个实体或者操作与另一个实体或操作区分开来, 而不一定要求 或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。 而且, 术 语 "包括"、 "包含" 或者其任何其他变体意在涵盖非排他性的包含, 从而使 得包括一系列要素的过程、 方法、 商品或者设备不仅包括那些要素, 而且还 包括没有明确列出的其他要素, 或者是还包括为这种过程、 方法、 商品或者 设备所固有的要素。 在没有更多限制的情况下, 由语句 "包括一个 ... ... " 限 定的要素, 并不排除在包括所述要素的过程、 方法、 商品或者设备中还存在 另外的相同要素。
以上对本申请所提供的一种预失真系数的更新方法和系统, 进行了详细 介绍, 本文中应用了具体个例对本申请的原理及实施方式进行了阐述, 以上 实施例的说明只是用于帮助理解本申请的方法及其核心思想; 同时, 对于本 领域的一般技术人员, 依据本申请的思想, 在具体实施方式及应用范围上均 会有改变之处, 综上所述, 本说明书内容不应理解为对本申请的限制。

Claims

权 利 要 求 书
1、 一种预失真系数的切换方法, 其特征在于, 包括:
预置主用表和备用表, 其中, 主用表中存储默认的预失真系数, 备用表 用于存储更新的预失真系数;
当预失真处理器的数据源采用被用表时,釆用所述更新的预失真系数进 行参数输出处理得到预失真参数, 并将所述预失真参数与输入信号共同通过 预失真处理器得到预失真信号;
将所述预失真信号通过各类信号处理器得到第一信号,并确定所述第一 信号的功率数据;
若所述第一信号的功率数据大于或等于设定范围,则继续采用备用表作 为预失真处理器的数据源;
若所述第一信号的功率数据小于设定范围,则将所述预失真处理器的数 据源切换成主用表。
2、 根据权利要求 1所述的方法, 其特征在于, 所述确定所述第一信号 的功率数据, 包括:
依据所述第一信号的连续性确定功率参数;
对所述第一信号进行快速傅里叶变换,并与所述功率参数共同确定所述 第一信号的功率数据, 其中, 所述功率数据包括以下至少一项: 邻道功率和 邻道功率比。
3、 根据权利要求 2所述的方法, 其特征在于, 所述依据所述第一信号 的连续性确定功率参数, 包括:
检测所述第一信号的连续性,并依据所述连续性相查找对应参数配置表 中的功率参数, 其中, 所述功率参数包括以下至少一项: 采样速率、 中心频 点、 采样点数、 载波个数、 载波带内带宽和载波发送带宽。
4、 根据权利要求 3所述的方法, 其特征在于, 对所述第一信号进行快 速傅里叶变换,并与所述功率参数共同确定所述第一信号的功率数据,包括: 根据所述功率参数计算所述笫一信号的频带的各频点;
对第一信号进行去噪修正后 ,进行快速傅里叶变换得到每个频点的功率 谱密度; 对所述功率谱密度进行加权处理,并确定第一信号的有用功率和邻道功 率;
计算有用信号功率和邻道信号功率的比值后取对数,得到第一信号的邻 道功率比。
5、 根据权利要求 1 所述的方法, 其特征在于, 若备用表预置时为空, 则所述的方法还包括:
将主用表作为所述预失真处理器的数据源,釆用所述默认的预失真系数 进行参数输出处理得到预失真参数, 并将所述预失真参数与输入信号共同通 过预失真处理器得到预失真信号;
将所述预失真信号通过各类信号处理器得到第一信号。
6、 根据权利要求 1或 5任一所述的方法, 其特征在于, 将所述预失真 信号通过各类信号处理器得到第一信号之后, 还包括:
将所述第一信号进行预失真参数训练得到更新的预失真系数,并将所述 更新的预失真系数更新到备用表中。
7、 根据权利要求 6所述的方法, 其特征在于, 所述的方法还包括: 若将主用表作为所述预失真处理器的数据源,则在将更新的预失真系数 更新到备用表后, 将所述预失真处理器的数据源切换成备用表。
8、 根据权利要求 6所述的方法, 其特征在于, 所述将所述更新的预失 真系数更新到备用表, 包括:
计算所述更新的预失真系数的系数加权和,并在所述系数加权和满足预 设条件时, 将所述更新的预失真系数更新到备用表。
9、 一种预失真系数的更新系统, 其特征在于, 包括: 参数控制器、 预 失真处理器、 各类信号处理器、 运算器和切换控制器;
所述参数控制器中包括: 主用表、 备用表, 其中, 主用表中存储默认的 预失真系数, 备用表用于存储更新的预失真系数;
所述参数控制器, 配置为当预失真处理器的数据源釆用被用表时, 釆用 更新的预失真系数进行参数输出处理得到预失真参数;
所述预失真处理器, 配置为在将所述预失真参数与输入信号共同通过预 失真处理器得到预失真信号;
所述各类信号处理器, 配置为对所述预失真信号进行处理得到第一信 号;
所述运算器, 配置为确定所述第一信号的功率数据;
所述切换控制器, 配置为若第一信号的功率数据大于或等于设定范围, 则继续釆用备用表作为预失真处理器的数据源; 若第一信号的功率数据小于 设定范围, 则将所述预失真处理器的数据源切换成主用表。
10、 根据权利要求 9所述的系统, 其特征在于;
所述运算器, 具体配置为依据所述第一信号的连续性确定功率参数; 对 所述第一信号进行快速傅里叶变换, 并与所述功率参数共同确定所述第一信 号的功率数据, 其中, 所述功率数据包括以下至少一项: 邻道功率和邻道功 率比。
11、 根据权利要求 10所述的系统, 其特征在于;
所述运算器, 具体配置为检测所述第一信号的连续性, 并依据所述连续 性相查找对应参数配置表中的功率参数, 其中, 所述功率参数包括以下至少 一项: 釆样速率、 中心频点、 釆样点数、 载波个数、 载波带内带宽和载波发 送带宽。
12、 根据权利要求 11所述的系统, 其特征在于;
所述运算器,具体配置为根据所述功率参数计算所述第一信号的频带的 各频点; 对第一信号进行去噪修正后, 进行快速傅里叶变换得到每个频点的 功率谱密度; 通过所述功率谱密度进行加权处理, 并确定第一信号的有用功 率和邻道功率; 计算有用信号功率和邻道信号功率的比值后取对数, 得到第 一信号的邻道功率比。
13、 根据权利要求 9所述的系统, 其特征在于, 若备用表预置时为空; 所述参数控制器, 还配置为将主用表作为所述预失真处理器的数据源, 釆用所述默认的预失真系数进行参数输出处理得到预失真参数;
所述预失真处理器, 配置为并将所述预失真参数与输入信号共同通过预 失真处理器得到预失真信号; 所述各类信号处理器, 配置为将所述预失真信号通过各类信号处理器得 到第一信号。
14、 根据权利要求 9或 13任一所述的系统, 其特征在于, 还包括: 参数训练器, 配置为将所述第一信号进行预失真参数训练得到更新的预 失真系数, 并将所述更新的预失真系数更新到备用表中。
15、 根据权利要求 14所述的系统, 其特征在于:
所述切换控制器, 还配置为若将主用表作为所述预失真处理器的数据 源, 则在将更新的预失真系数更新到备用表后, 将所述预失真处理器的数据 源切换成备用表。
16、 根据权利要求 14所述的系统, 其特征在于:
所述参数训练器, 具体配置为计算所述更新的预失真系数的系数加权 和, 并在所述系数加权和满足预设条件时, 将所述更新的预失真系数更新到 备用表。
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112039445A (zh) * 2019-06-03 2020-12-04 大唐移动通信设备有限公司 一种数字预失真dpd的处理方法及装置
CN115766356A (zh) * 2022-11-11 2023-03-07 成都芯通软件有限公司 一种预失真器系数配置方法、装置、设备及介质

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103107967B (zh) 2013-01-25 2016-02-03 大唐移动通信设备有限公司 一种预失真系数的更新方法和系统
US10477031B2 (en) * 2015-12-08 2019-11-12 Nuance Communications, Inc. System and method for suppression of non-linear acoustic echoes
US9730165B2 (en) * 2016-01-12 2017-08-08 Qualcomm Incorporated Techniques for modifying transceiver power during digital pre-distortion training
EP3701691A4 (en) * 2017-12-29 2021-08-25 Apple Inc. PREDISTORSION CIRCUIT, PROCESS FOR GENERATING A PREDISTORED BASE BAND SIGNAL, CONTROL CIRCUIT FOR A PREDISTORSION CIRCUIT, PROCESS FOR DETERMINING PARAMETERS FOR A PREDISTORSION CIRCUIT AS WELL AS THE APPARATUS AND PREDISTORSION PROCEDURE BASED
CN113852576A (zh) * 2020-06-28 2021-12-28 中兴通讯股份有限公司 信号失真预校正方法、装置及非易失性存储介质
CN112838996B (zh) * 2020-12-31 2022-03-25 京信网络系统股份有限公司 数字预失真系数更新方法、装置、通信设备和存储介质

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1795607A (zh) * 2003-03-25 2006-06-28 艾利森电话股份有限公司 功率放大器预失真
CN101056288A (zh) * 2007-06-14 2007-10-17 中兴通讯股份有限公司 预失真模型装置和信号的预失真处理装置、系统及方法
CN101057394A (zh) * 2004-09-15 2007-10-17 艾利森电话股份有限公司 与信号预失真有关的布置和方法
CN101355536A (zh) * 2007-07-24 2009-01-28 鼎桥通信技术有限公司 对基带信号进行数字预失真处理的装置及方法
CN103107967A (zh) * 2013-01-25 2013-05-15 大唐移动通信设备有限公司 一种预失真系数的更新方法和系统

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5740520A (en) * 1996-04-03 1998-04-14 State Of Israel Channel correction transceiver
JP2001111438A (ja) * 1999-10-13 2001-04-20 Nec Corp 送信機及びそれに用いる歪み補償方法
JP4326673B2 (ja) * 2000-06-06 2009-09-09 富士通株式会社 非線形歪補償装置を有する通信装置の起動方法
CN1166138C (zh) * 2000-07-20 2004-09-08 华为技术有限公司 一种宽带发射机的自适应数字预失真方法和装置
US20030058959A1 (en) * 2001-09-25 2003-03-27 Caly Networks. Combined digital adaptive pre-distorter and pre-equalizer system for modems in link hopping radio networks
KR100480278B1 (ko) * 2002-12-24 2005-04-07 삼성전자주식회사 광대역 전력 증폭기를 위한 디지털 전치보상기 및 그적응화 방법
US7606322B2 (en) * 2004-10-07 2009-10-20 Microelectronics Technology Inc. Digital pre-distortion technique using nonlinear filters
CN101771383B (zh) * 2008-12-31 2012-04-18 大唐移动通信设备有限公司 一种实现信号预失真处理的方法和装置
JP5338378B2 (ja) * 2009-03-02 2013-11-13 富士通株式会社 歪補償装置及び方法
CN101990281B (zh) * 2009-08-05 2013-01-09 大唐移动通信设备有限公司 主备显示查找表交替工作的方法和装置
CN102163956B (zh) * 2010-02-24 2014-01-01 富士通株式会社 用于预失真器的信号反馈回路和方法、以及功率放大设备

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1795607A (zh) * 2003-03-25 2006-06-28 艾利森电话股份有限公司 功率放大器预失真
CN101057394A (zh) * 2004-09-15 2007-10-17 艾利森电话股份有限公司 与信号预失真有关的布置和方法
CN101056288A (zh) * 2007-06-14 2007-10-17 中兴通讯股份有限公司 预失真模型装置和信号的预失真处理装置、系统及方法
CN101355536A (zh) * 2007-07-24 2009-01-28 鼎桥通信技术有限公司 对基带信号进行数字预失真处理的装置及方法
CN103107967A (zh) * 2013-01-25 2013-05-15 大唐移动通信设备有限公司 一种预失真系数的更新方法和系统

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2938034A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112039445A (zh) * 2019-06-03 2020-12-04 大唐移动通信设备有限公司 一种数字预失真dpd的处理方法及装置
CN115766356A (zh) * 2022-11-11 2023-03-07 成都芯通软件有限公司 一种预失真器系数配置方法、装置、设备及介质

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