WO2019153328A1 - 功率调整的方法和装置 - Google Patents

功率调整的方法和装置 Download PDF

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Publication number
WO2019153328A1
WO2019153328A1 PCT/CN2018/076439 CN2018076439W WO2019153328A1 WO 2019153328 A1 WO2019153328 A1 WO 2019153328A1 CN 2018076439 W CN2018076439 W CN 2018076439W WO 2019153328 A1 WO2019153328 A1 WO 2019153328A1
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WIPO (PCT)
Prior art keywords
signal
output
value
power
dpd
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/CN2018/076439
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English (en)
French (fr)
Inventor
蔡梦
李昆
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2018/076439 priority Critical patent/WO2019153328A1/zh
Priority to EP18905122.0A priority patent/EP3736979B1/en
Priority to CN201880087957.0A priority patent/CN111656682B/zh
Publication of WO2019153328A1 publication Critical patent/WO2019153328A1/zh
Priority to US16/991,725 priority patent/US11075659B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0216—Continuous control
    • H03F1/0222—Continuous control by using a signal derived from the input signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0261—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A
    • H03F1/0266—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A by using a signal derived from the input signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/321—Use of a microprocessor in an amplifier circuit or its control circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2201/00—Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
    • H03F2201/32—Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
    • H03F2201/3233—Adaptive predistortion using lookup table, e.g. memory, RAM, ROM, LUT, to generate the predistortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/0425—Circuits with power amplifiers with linearisation using predistortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/0433—Circuits with power amplifiers with linearisation using feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041—Arrangements at the transmitter end

Definitions

  • the present application relates to the field of communications and, more particularly, to a method and apparatus for power adjustment.
  • a cloud radio access network is a network architecture based on a centralized baseband unit (BBU) and a distributed remote radio unit (RRU).
  • the common public radio interface (CPRI) is the most important interface between the BBU and the RRU.
  • the traditional microwave CPRI bearer treats the in-phase and quadrature (I/Q) data and the control word (CW) in the CPRI as a bit stream for transmission, and the required bandwidth resources are large.
  • the CPRI transmission pipeline is under great pressure.
  • EWF wireless fronthaul
  • MIMO multi-input multi-output
  • cross cross-polarization interference cancellation
  • XPIC -polarization interference cancellation
  • Power amplifier is the most important nonlinear source in microwave communication systems. Due to the nonlinear nature of the power amplifier, when the signal passes through the power amplifier, in-band distortion occurs, degrading the performance of the communication system.
  • the digital pre-distortion (DPD) algorithm pre-distorts the in-band distortion information of the power amplifier to reduce the nonlinearity of the power amplifier.
  • the third-order intermodulation distortion (IMD3) spectral performance or the error vector magnitude (EVM) performance of the I/Q signal may deteriorate.
  • the prior art reduces the nonlinearity of the power amplifier by fixedly backing off the output power of the power amplifier to improve the IMD3 spectral performance and the EVM performance of the I/Q signal.
  • the CPRI I/Q traffic changes in real time.
  • the prior art fixedly rolls back the output power of the power amplifier, and cannot effectively improve the spectrum performance and I/Q signals of the IMD3. EVM performance.
  • the present application provides a method and apparatus for power adjustment, which solves the problem that the spectrum performance of IMD3 and the EVM performance of the I/Q signal cannot be effectively improved.
  • the embodiment of the present application provides a method for power adjustment, including: acquiring a signal to be output; performing first automatic gain control AGC processing on the to-be-output signal, and obtaining the to-be-output after first AGC processing a signal, and obtaining a gain value of the signal to be output; performing digital predistortion DPD processing on the to-be-output signal processed by the first AGC to obtain the to-be-output signal processed by DPD; calculating according to the gain value Output power back-off OBO value; adjusting output power of the DPD-processed output signal based on the OBO value; and transmitting the power-adjusted to-be-output signal to the signal receiving end.
  • the output power of the output signal is adjusted based on the OBO value. Since the OBO value is calculated according to the gain value, and the gain value corresponds to the flow rate, the embodiment of the present application can treat the flow rate in real time according to the change of the flow rate.
  • the output power of the output signal is adjusted to reduce the nonlinearity of the power amplifier, thereby improving the spectral performance of the IMD3 and the EVM performance of the I/Q signal.
  • the method further includes: performing a second to the DPD-processed to-be-output signal ACG processing.
  • the first AGC processing is performed on the output signal, the energy fluctuation caused by the CPRI I/Q flow dissatisfaction may be adjusted, and the second ACG processing is performed on the DPD-processed to-be-output signal, and the output of the DPD processing may be adjusted.
  • Energy fluctuations which can decouple the energy fluctuations caused by CPRI I/Q flow dissatisfaction and the energy fluctuations output by DPD processing, thereby improving IMD3 spectral performance and transmission distance.
  • the adjusting, according to the OBO value, the output power of the DPD-processed output signal to be output including: performing DPD processing based on the OBO value and a preset amplification factor The output power of the signal to be output is adjusted.
  • the adjusting, according to the OBO value and the preset amplification factor, the output power of the DPD-processed output signal to be output including: adjusting the output power to a first value The first value is obtained by subtracting the OBO value from the product of the output power and the preset amplification factor.
  • the adjusting the output power to a first value includes: if the product of the output power and the preset amplification factor is greater than a first threshold, adjusting the output power to The first value.
  • the signal transmitting end can adjust the output power when the product of the output power and the preset amplification factor is greater than the first threshold, instead of being in any case
  • the output power is adjusted to avoid the problem that the output power is too large or too small, so that the output power can be within a reasonable range.
  • the adjusting, according to the OBO value and the preset amplification factor, the output power of the DPD-processed output signal to be output further comprising: based on the OBO value, the preset The amplification factor and the adjustment amount fed back by the signal receiving end adjust the output power of the to-be-output signal processed by the DPD.
  • the output power of the DPD-processed signal to be output is adjusted based on the OBO value, the preset amplification factor, and an adjustment amount fed back by the signal receiving end, including And adjusting the output power to a second value, where the second value is obtained by subtracting the OBO value according to a third value, where the third value is according to the output power before the adjustment The product of the preset magnification is added to the adjustment amount.
  • the adjusting the output power to the second value comprises: if the third value is greater than the first threshold, adjusting the output power to the second value.
  • the signal transmitting end can adjust the output power to the second value, so that the output power can be within a reasonable range, and the power can be saved, and the nonlinearity of the power amplifier can be reduced.
  • the first threshold is a maximum power used when transmitting the to-be-output signal processed by the DPD under the lowest traffic.
  • the gain value corresponds to the change in the flow rate
  • the OBO value is calculated according to the gain value so that the OBO value also corresponds to the flow rate.
  • the method before the acquiring the in-phase and quadrature signals to be output, the method further includes: acquiring a general-purpose wireless common interface CPRI data stream, where the CPRI data stream includes in-phase and quadrature I/Q signals and Controlling a word CW signal; separating the I/Q signal and the CW signal in the CPRI data stream; encoding and mapping the separated CW signal to obtain a mapping signal; and separating the I/ The Q signal is subjected to compression filtering; the mapping signal is combined with the compression-filtered I/Q signal to obtain the to-be-output signal.
  • the I/Q signal and the CW signal in the CPIR data stream are separated, and after a certain processing, they are combined and transmitted, so that the transmission rate of the CPRI is multiplied.
  • the embodiment of the present application provides a power adjustment apparatus, including:
  • a first automatic gain control AGC amplifier configured to acquire a signal to be output, perform first AGC processing on the signal to be output, obtain the to-be-output signal processed by the first AGC, and obtain a gain of the signal to be output value
  • a digital pre-distortion DPD calculator configured to perform DPD processing on the to-be-output signal passing through the first AGC amplifier to obtain the to-be-output signal processed by DPD;
  • An output power back-off OBO value calculator configured to calculate an OBO value according to the gain value obtained by the first AGC amplifier
  • a power amplifier for adjusting an output power of the to-be-output signal passing through the DPD calculator based on the OBO value obtained by the OBO value calculator, and transmitting the power-adjusted to the signal receiving end The signal to be output.
  • the power adjustment apparatus further includes a second AGC amplifier for performing a second ACG process on the to-be-output signal that passes through the DPD calculator.
  • the power amplifier is specifically configured to: output the signal to be output through the DPD calculator based on the OBO value obtained by the OBO value calculator and a preset amplification factor The power is adjusted.
  • the power amplifier is specifically configured to: adjust the output power to a first value, where the first value is a product of the output power and the preset amplification factor. Subtract the OBO value.
  • the power amplifier is specifically configured to adjust the output power to a first value if a product of the output power and the preset amplification factor is greater than a first threshold.
  • the power adjuster is specifically configured to: determine, according to the OBO value, the preset amplification factor, and an adjustment amount fed back by the signal receiving end, to the DPD calculator The output power of the output signal is adjusted.
  • the power amplifier is specifically configured to: adjust the output power to a second value, where the second value is obtained by subtracting the OBO value according to a third value, The third value is obtained by adding the adjustment product by the product of the output power before the adjustment and the preset amplification factor.
  • the power amplifier is specifically configured to adjust the output power to the second value if the third value is greater than a first threshold.
  • the first threshold is a maximum power used when transmitting the DPD-processed signal to be output at the lowest traffic.
  • the OBO value C 10*lg(1/G ⁇ 2), where C is the OBO value and G is the gain value.
  • the power adjustment apparatus further includes:
  • a splitter for acquiring a general wireless common interface CPRI data stream, wherein the CPRI data stream includes an in-phase and quadrature I/Q signal and a control word CW signal, and the I/Q signal in the CPRI data stream Separating from the CW signal;
  • mapping signal for encoding and mapping the CW signal passing through the splitter to obtain a mapping signal
  • a compressor for compressing and filtering the I/Q signal passing through the splitter
  • a multiplexer configured to combine the mapping signal passing through the mapper and the I/Q signal passing through the compressor to obtain the to-be-output signal.
  • the embodiment of the present application further provides a power adjustment apparatus, where the power adjustment apparatus includes a processor, and is used to implement the functions in the method described in the foregoing first aspect.
  • the power adjustment device can also include a memory for storing program instructions and data.
  • the memory is coupled to the processor, and the processor can invoke and execute program instructions stored in the memory for implementing the functions of the power conditioning apparatus in the method described above in the first aspect.
  • the power adjustment apparatus may further include a transceiver for receiving the received power of the signal to be output fed back by the signal receiving end to be outputted.
  • the embodiment of the present application provides an RRU, which is used to perform the method in any of the foregoing first aspect or any possible implementation manner of the first aspect.
  • the embodiment of the present application provides a BBU, which is used to perform the method in any of the foregoing first aspect or any possible implementation manner of the first aspect.
  • the embodiment of the present application provides a base station, where the base station includes an RRU or a BBU, and the RRU or the BBU is used to perform the method in any of the foregoing first aspect or any possible implementation manner of the first aspect.
  • an embodiment of the present application provides a computer storage medium storing program instructions, which can implement the method described in the first aspect when being read and executed by one or more processors.
  • an embodiment of the present application provides a computer program product comprising instructions, when executed on a computer, causing a computer to perform the method described in the first aspect above.
  • the embodiment of the present application provides a system, where the system includes the power adjustment device of the second aspect.
  • FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a method for power adjustment provided by an embodiment of the present application
  • FIG. 3 is a structural diagram of combining an EWF technology and a remote DPD algorithm according to an embodiment of the present application
  • FIG. 5 is a structural diagram of a first AGC amplifier according to an embodiment of the present application.
  • FIG. 6 is a structural diagram of combining an EWF technology and a remote DPD algorithm according to another embodiment of the present application.
  • FIG. 7 is a schematic block diagram of a power adjustment apparatus according to an embodiment of the present application.
  • FIG. 8 is a schematic block diagram of a power adjustment apparatus according to an embodiment of the present application.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • FDD LTE frequency division duplex
  • TDD LTE Time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • 5G future fifth generation
  • 5G fifth generation
  • NR new radio
  • FIG. 1 is a schematic diagram of a network architecture of a base station to which an embodiment of the present application is applicable.
  • the base station may include a BBU, an RRU, and a baseband data transmission between the BBU and the RRU through the CPRI.
  • the BBU is usually placed in the equipment room, the RRU is placed at the remote end, and one BBU can be connected to multiple RRUs.
  • the BBU mainly performs baseband processing (such as channel codec, modulation and demodulation) of signals, provides transmission management and interfaces, manages radio resources, and provides clock signals.
  • the RRU mainly performs the intermediate frequency processing of the signal (such as digital I/Q modulation and demodulation, up-down conversion, DA/AD conversion), radio frequency processing, duplexing and the like.
  • a base station (BS) related to an embodiment of the present application is a device deployed in a radio access network to perform wireless communication with a terminal.
  • the base station may have various forms, such as a macro base station, a micro base station, a relay station, and an access point.
  • the base station involved in the embodiment of the present application may be a base station in a 5G system or a base station in an LTE system, where the base station in the 5G system may also be referred to as a transmission reception point (TRP) or a next generation.
  • Base station generation NodeB, gNB
  • the IMD3 spectrum performance and the EVM performance of the I/Q signal deteriorate.
  • the deterioration of the IMD3 spectrum performance will reduce the transmission distance of the microwave; the EVM performance of the I/Q signal will deteriorate, and the microwave transmission will be difficult to support a higher modulation mode.
  • the embodiment of the present application provides a technical solution, which can automatically perform power adjustment according to real-time change of traffic, thereby improving IMD3 spectrum performance and EVM performance of I/Q signals.
  • EWF technology is not limited in the embodiment of the present application, that is, it may also be expressed as other names, such as an efficient CPRI bearer technology.
  • FIG. 2 is a schematic flowchart of a method for power adjustment according to an embodiment of the present application.
  • the method of Figure 2 can be performed by a signal transmitting end.
  • the signal transmitting end may be a BBU or an RRU, which is not limited in this application.
  • the method of Figure 2 can include 210-260, which are described in detail below.
  • a signal to be output is obtained.
  • the DPD algorithm may include a far-end DPD algorithm and a near-end DPD algorithm.
  • the structural diagram of the EWF technology combined with the remote DPD algorithm according to the embodiment of the present application may be as shown in FIG. 3, and the structural diagram of the EWF technology combined with the near-end DPD algorithm may be as shown in FIG. 4.
  • the signal transmitting end can input the CPRI data stream into the splitter, wherein the CPRI data stream can include an I/Q signal and a CW signal, and in the splitter, the signal transmitting end can input the input CPRI data stream.
  • the I/Q signal and the CW signal are separated.
  • the signal transmitting end may use a frequency division multiplexing technique to separate the I/Q signal and the CW signal in the CPRI data stream according to the difference between the I/Q signal and the CW signal frequency.
  • the separated I/Q signal can enter the compressor, and the signal transmitting end can compress and filter the separated I/Q signal in the compressor to obtain a compressed signal; the separated CW signal can enter the mapper, and the signal transmitting end
  • the separated CW signal may be subjected to encoding processing and mapping processing in the mapper to obtain a mapping signal.
  • the mapping method may include binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64QAM, 256QAM and 1024QAM, etc.
  • BPSK binary phase shift keying
  • QPSK quadrature phase shift keying
  • QAM 16 quadrature amplitude modulation
  • 64QAM 64QAM
  • 256QAM 256QAM
  • 1024QAM etc.
  • the mapping method may also be referred to as a mapping mechanism or other name, which is not limited in this application.
  • the signal transmitting end can input the compressed signal and the mapping signal into the multiplexer, and after some possible multiplexing processing in the multiplexer, the compressed signal and the mapped signal can be combined to obtain a signal to be output.
  • the multiplexing process may follow one of the following principles: time division multiplexing (TDM), frequency division multiplexing (FDM), and code division multiplexing. , CDM) or wavelength division multiplexing (WDM).
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • CDM code division multiplexing
  • WDM wavelength division multiplexing
  • the multiplexer can be a time division multiplexer.
  • the multiplexer can be a frequency division multiplexer.
  • the signal transmitting end separates the I/Q signal and the CW signal in the CPRI data stream, and after a certain processing, combines and transmits them together, so that the transmission rate of the microwave is multiplied.
  • a first automatic gain control (AGC) process is performed on the output signal to obtain a signal to be output processed by the first AGC, and a gain value of the signal to be output is obtained.
  • AGC automatic gain control
  • the output signal enters the first AGC amplifier, and in the first AGC amplifier, the signal transmitting end performs the first AGC processing on the output signal, and the signal to be output processed by the first AGC can be obtained, and the signal can be obtained.
  • the structure of the first AGC amplifier can be various, and is not specifically limited in this embodiment of the present application.
  • the structure of the first AGC amplifier may be as shown in FIG. It should be understood that FIG. 5 is only an example and does not constitute a limitation on the embodiments of the present application.
  • the input signal is a signal to be output
  • the output signal is a signal to be output processed by the first AGC
  • the reference signal can take 1.
  • the signal to be output processed by the first AGC can be obtained by multiplying the output signal by the gain value.
  • the signal to be output processed by the first AGC may be fed back to the first power calculator, and in the first power calculator, the signal transmitting end performs power calculation on the signal to be output processed by the first AGC.
  • the reference signal can enter a second power calculator, in which the signal transmitter performs a power calculation on the reference signal.
  • the output signal of the first power calculator and the output signal of the second power calculator can be subtracted in the subtractor, and the subtracted signal can enter the low pass filter, and the signal below the cutoff frequency can pass through the low pass filter. Signals above the cutoff frequency cannot pass through the low pass filter.
  • the low pass filter can include one of the following: a Butterworth filter, a Chebyshev filter.
  • the signal through the low-pass filter can enter the accumulator, and after some possible processing in the accumulator, the gain value of the signal to be output can be obtained.
  • the first AGC processing may work corresponding to the linear amplifying circuit, so that the output amplitude of the signal to be output processed by the first AGC is increased; when the signal to be output reaches a certain intensity, the first The AGC processing can work corresponding to the compression amplifying circuit to reduce the output amplitude of the signal to be output processed by the first AGC.
  • the first AGC process can adjust the energy fluctuation caused by the CPRI I/Q traffic dissatisfaction.
  • DPD processing is performed on the to-be-output signal processed by the first AGC to obtain a DPD-processed signal to be output.
  • the DPD processing may include DPD calculation and DPD coefficient update.
  • the DPD calculation can be implemented in the DPD calculator, the DPD calculator can be in front of the power amplifier, and cascaded with the power amplifier; the DPD coefficient update can be implemented in the DPD coefficient updater, and the DPD coefficient updater can be at the signal transmitting end. It can also be at the signal receiving end.
  • the signal transmitting end can send the power-adjusted signal to the signal receiving end through the transmission channel, and after receiving the signal, the signal receiving end can perform the third AGC processing on the signal in the third AGC controller.
  • the signal receiving end can perform synchronization and equalization processing on the signal processed by the third AGC to obtain an equalized signal, and the equalized signal can be input to the decider.
  • the decider the signal receiving end can judge the equalized signal according to the constellation diagram. Which quadrant belongs to, so that the desired signal can be obtained.
  • the desired signal and the equalized signal enter the DPD coefficient updater, and the signal receiving end can adaptively update the DPD coefficients in the DPD coefficient updater.
  • the signal receiving end may adaptively update the DPD coefficients by using a least mean square (LMS) algorithm.
  • LMS least mean square
  • the signal receiving end may adaptively update the DPD coefficients by using a recursive least square (RLS) algorithm.
  • RLS recursive least square
  • the signal receiving end may adaptively update the DPD coefficients by using various possible deformation and optimization algorithms of the LMS and the RLS, which is not limited in this application.
  • the updated coefficient can be transmitted to the signal transmitting end through the return channel, and the signal transmitting end can receive the updated coefficient sent by the signal receiving end,
  • the pre-distortion processing of the signal to be output processed by the first AGC is performed in the DPD calculator according to the updated coefficient.
  • the power-adjusted signal can enter the third AGC controller, and the signal transmitting end can be in the third AGC controller, and the third AGC processing can be performed on the power-adjusted signal, and the signal processed by the third AGC can enter the DPD coefficient updater.
  • DPD calculator 2 The output of the DPD calculator 1 and the output of the DPD calculator 2 can enter an error calculator, which can calculate an error signal from the output of the DPD calculator 1 and the output of the DPD calculator 2 in an error calculator.
  • the error signal and the signal processed by the third AGC may enter the DPD coefficient updater, and the signal transmitting end may adaptively update the DPD coefficient according to the error signal and the signal processed by the third AGC in the DPD coefficient updater.
  • the signal transmitting end may adaptively update the DPD coefficients by using the LMS algorithm or the RLS algorithm, or adaptively update the DPD coefficients by using various possible deformation and optimization algorithms of the LMS and the RLS. limited.
  • the signal transmitting end can send the updated coefficients to the DPD calculator 2 and the DPD calculator 1, and perform DPD processing in the DPD calculator 2 and the DPD calculator 1 according to the updated coefficients.
  • the structure of the third AGC controller and the structure of the first AGC amplifier may be the same or different, which is not limited in this application.
  • the DPD-processed to-be-output signal may enter the second AGC controller, and the signal transmitting end performs a second AGC process on the DPD-processed to-be-output signal in the second AGC controller.
  • the second AGC processing may work corresponding to the linear amplifying circuit, so that the output amplitude of the signal to be output processed by the second AGC is increased; the output to be output after being processed by the DPD
  • the second AGC processing can work corresponding to the compression amplifying circuit to reduce the output amplitude of the signal to be output processed by the second AGC.
  • the structure of the second AGC controller may be different, and the configuration of the first AGC amplifier and the third AGC controller may be the same or different, which is not limited in this application.
  • the second AGC controller structure may be the structure shown in FIG.
  • CPRI I/Q signals may include some zeros, which may cause CPRI traffic to be dissatisfied, while the power of the I/Q signal is calculated by calculating the power of all symbols in the I/Q signal. The average value is obtained by calculating the average power, and the zero in the I/Q signal is also counted, and the degree of dissatisfaction of each flow is different, which causes energy fluctuation.
  • the first AGC amplifier can adjust the energy fluctuation caused by the flow dissatisfaction
  • the second AGC controller can adjust the energy fluctuation of the DPD calculator output, so that the energy fluctuation caused by the DPD calculator and the energy caused by the flow dissatisfaction can be adjusted.
  • the ripple is decoupled to improve the spectral performance of the IMD3 and the transmission distance of the microwave.
  • an output power backoff (OBO) value is calculated based on the gain value.
  • the gain value obtained by the signal transmitting end in the first AGC amplifier for performing the first AGC processing on the output signal may enter the OBO value calculator, and the signal transmitting end may calculate the OBO value in the OBO value calculator.
  • the OBO value and the gain value may be corresponding relationships, that is, the larger the gain value, the smaller the OBO value.
  • this correspondence can be expressed as equation (1):
  • the gain value is in one-to-one correspondence with the flow rate, that is, the lower the flow rate is, the larger the gain value is, and the OBO value is calculated according to the gain value, so that the OBO value is also corresponding to the flow rate, that is, the lower the flow rate, the higher the OBO value. small.
  • the output power of the DPD-processed signal to be output is adjusted based on the OBO value.
  • the OBO value calculated in the OBO value calculator enters the power amplifier, and the signal transmitting end can adjust the output power of the DPD-processed signal to be output based on the input OBO value.
  • the signal transmitting end may adjust the output power of the DPD-processed signal to be output based on the OBO value and the preset amplification factor.
  • the signal transmitting end can adjust the output power to a first value, wherein the first value is obtained by subtracting the OBO value from the product of the output power and the preset amplification factor.
  • the signal transmitting end may adjust the output power to the first value if the product of the output power and the preset amplification factor is greater than the first threshold a.
  • a may be the maximum power used when transmitting the DPD-processed signal to be output under the lowest traffic.
  • the lowest flow rate can be expressed as a case where the CPRI I/Q signal flow is zero, that is, only the CW signal is present in the CPRI data stream.
  • the minimum flow does not exclude the case where the CPRI I/Q signal flow is a small value.
  • the CPRI I/Q signal traffic may be 0.01% of the CPRI data stream, or may be 0.2% or 0.5%, etc., which is not limited in this application.
  • the signal transmitting end can obtain a value by testing.
  • the signal transmitting end can obtain the value of a by testing the operating curve of the power amplifier with the CPRI I/Q signal flow being zero.
  • the signal transmitting end can obtain a value by calculation.
  • the signal transmitting end can obtain an a value by estimation according to some possible methods.
  • the signal transmitting end may amplify the output power according to a preset amplification factor, and then adjust the amplified output power based on the OBO value.
  • the signal transmitting end can compare the amplified output power with the a value. If the amplified output power is greater than a, the signal transmitting end can back up the amplified output power according to the OBO value.
  • the signal transmitting end may not adjust the amplified output power.
  • the output power is P
  • the preset amplification factor is N
  • the OBO value is C.
  • the signal transmitting end firstly amplifies the output power by N times to obtain an amplified output power N*P. If N*P>a, N*P is rolled back according to the C value; if N*P ⁇ a, then N*P does not change.
  • the signal transmitting end can directly adjust the output power based on the OBO value and the preset amplification factor.
  • the signal transmitting end can adjust the output power to the product of the output power and the preset amplification factor.
  • the output power is P
  • the preset amplification factor is N
  • the OBO value is C. If N*P>a, the signal transmitting end can adjust the output power to N*PC; if N*P ⁇ a, Then the signal transmitter can adjust the output power to N*P.
  • the signal transmitting end may adjust the output power of the DPD-processed output signal based on the OBO value, the preset amplification factor, and the adjustment amount fed back by the signal receiving end.
  • the signal transmitting end may adjust the output power based on the OBO value and the preset amplification factor, and the signal transmitting end may be based on the OBO value, the preset amplification factor, and the adjustment amount of the signal receiving end feedback.
  • the embodiments for adjusting the output power may be implemented separately or in combination. The following describes separately an implementation manner in which the signal transmitting end can adjust the output power based on the OBO value, the preset amplification factor, and the adjustment amount fed back by the signal receiving end. It should be understood that the following embodiments may refer to related descriptions in the foregoing embodiments, and the following description is omitted for brevity.
  • FIG. 6 is a structural diagram of an EWF technology combined with a remote DPD algorithm according to another embodiment of the present application. As shown in FIG. 6, the signal receiving end can feed back the received power to the transmitting end.
  • the signal transmitting end may adjust the output power to a second value, where the second value is obtained according to the third value minus the OBO value, and the third value is according to the output power and the pre-adjustment before the adjustment. Set the product of the magnification and add the adjustment amount.
  • the signal transmitting end may adjust the output power to a second value.
  • the signal transmitting end may amplify the output power according to a preset amplification factor, and then adjust the amplified output power based on the OBO value and the adjustment amount.
  • the signal transmitting end can utilize the difference between the adjusted amount and the OBO value, The amplified output power is boosted;
  • the signal transmitting end can use the adjustment amount to boost the amplified output power.
  • the adjustment amount is a positive value, indicating that the amplified output power is boosted.
  • the output power can be made P, the preset magnification is N, the adjustment amount is X, and the OBO value is C.
  • the signal transmitting end firstly amplifies the output power by N times, and obtains the amplified output power N*P. If the output end of the signal is increased by X after the amplified output power, the amplified output power is still greater than a, that is, 10*lg ( N*P)+X>a, the signal transmitting end can boost the amplified output power according to the XC value.
  • the amplified output power is less than or equal to a, that is, 10*lg(N*P)+X ⁇ a, then the signal transmitting end can be amplified according to the X value pair.
  • the output power is boosted.
  • the signal transmitting end may use the preset adjustment amount and the OBO value. Poor, the output power is amplified back;
  • the signal transmitting end can use the adjustment amount to roll back the amplified output power.
  • the adjustment amount is a negative value, indicating that the amplified output power is retracted.
  • the output power can be made P, the preset magnification is N, the adjustment amount is Y, and the OBO value is C.
  • the signal transmitting end firstly amplifies the output power by N times, and the amplified output power is N*P. If the signal transmitting end retracts the amplified output power by Y, the amplified output power is still greater than a, that is, 10*lg. (N*P)+Y>a, the signal transmitting end can rewind the amplified output power according to the YC value.
  • the signal transmitting end retracts Y after the amplified output power, the amplified output power is less than or equal to a, that is, 10*lg(N*P)+Y ⁇ a, then the signal transmitting end can be amplified according to the Y value. The output power is then rolled back.
  • the signal transmitting end can directly adjust the output power based on the OBO value, the preset amplification factor, and the adjustment amount fed back to the transmitting end by the signal receiving end.
  • the signal transmitting end may output The power adjustment is the difference between the value and the OBO value;
  • the signal transmitting end can adjust the output power to the value.
  • the adjustment amount is a positive value, indicating that the output power is boosted.
  • the output power can be made P
  • the preset magnification is N
  • the adjustment amount is X
  • the OBO value is C. If 10*lg(N*P)+X>a, the signal transmitting end can adjust the output power to 10*lg(N*P)+X-C value.
  • the signal transmitting end can adjust the output power to 10*lg(N*P)+X value.
  • the signal transmitting end may output the power. Adjusted to the difference between the value and the OBO value;
  • the signal transmitting end can adjust the output power to the value.
  • the adjustment amount is a negative value, indicating that the amplified output power is retracted.
  • the output power can be made P
  • the preset magnification is N
  • the adjustment amount is Y
  • the OBO value is C. If 10*lg(N*P)+Y>a, the signal transmitting end can adjust the output power to 10*lg(N*P)+Y-C value.
  • the signal transmitting end can adjust the output power to 10*lg(N*P)+Y value.
  • the adjustment amount fed back by the signal receiving end corresponds to the receiving power sent by the signal receiving end to the transmitting end, that is, the certain receiving power corresponds to a certain adjustment amount.
  • the signal transmitting end adjusts the output power of the DPD-processed output signal based on the OBO value, the preset amplification factor, and the adjustment amount.
  • the power adjusted output signal is transmitted to the signal receiving end.
  • the signal transmitting end can send the power-adjusted signal to be output to the signal receiving end.
  • the signal transmitting end can send the power-adjusted signal to be output to the signal receiving end and the third AGC controller.
  • amplitudes of the signals to be output received by the signal receiving end and the third AGC controller may be the same or different, which is not limited in this application.
  • the signal transmitting end can automatically adjust the output power of the output signal according to the real-time change of the traffic to reduce the nonlinearity of the power amplifier, thereby improving the spectrum performance of the IMD3 and the EVM performance of the I/Q signal.
  • Table 1 and Table 2 respectively show the IMD3 spectrum performance and the EVM performance improvement of the I/Q signal after using the technical solution of the embodiment of the present application, compared with other prior art solutions.
  • Table 1 shows the EMD3 spectrum performance and the EVM performance improvement of the I/Q signal after the technical solution of the embodiment of the present application is used when the CPRI I/Q traffic is 10%.
  • Table 2 shows the EMD3 spectrum performance and the EVM performance improvement of the I/Q signal after the technical solution of the embodiment of the present application is used when the CPRI I/Q traffic is 20%.
  • EVM performance corresponds to the minimum square error (MSE) in Tables 1 and 2.
  • MSE minimum square error
  • the QAM transmission in the table refers to the transmission of CPRI signals by means of digital 256QAM.
  • the spectral performance of the IMD3 corresponding to 10% and 20% of the CPRI I/Q traffic is significantly improved, and the power to be outputted signal is obtained.
  • the greater the output power the more significant the improvement in IMD3 spectrum performance.
  • the IMD3 spectrum performance can be improved by at least 4 dB; in the case of 20% CPRI I/Q traffic, the IMD3 spectrum performance can be improved by at least 5 dB.
  • the signal transmitting end may include a hardware structure and/or a software module, a hardware structure, a software module, or a hardware.
  • the structure plus the form of the software module implements the above functions.
  • One of the above functions is performed in a hardware structure, a software module, or a hardware structure plus a software module, depending on the specific application and design constraints of the technical solution.
  • FIG. 7 is a schematic block diagram of an apparatus of an embodiment of the present application. It should be understood that the power adjustment apparatus 700 shown in FIG. 7 is only an example, and the power adjustment apparatus of the embodiment of the present application may further include other modules or units, or include modules similar to those of the modules in FIG. 7, or not Includes all the modules in Figure 7.
  • the first AGC amplifier 710 is configured to obtain a signal to be output, and perform a first AGC process on the output signal to obtain a signal to be output processed by the first AGC, and obtain a gain value of the signal to be output.
  • the DPD calculator 720 is configured to perform DPD processing on the to-be-output signal passing through the first AGC amplifier 710 to obtain a DPD-processed to-be-output signal.
  • the OBO value calculator 730 is configured to calculate an OBO value based on the gain value obtained by the first AGC amplifier 710.
  • the power amplifier 740 is configured to adjust the output power of the signal to be output passing through the DPD calculator 720 based on the OBO value obtained by the OBO value calculator 730, and transmit the power-adjusted signal to be output to the signal receiving end.
  • the power adjustment apparatus 700 may further include a second AGC controller 750 for performing second ACG processing on the to-be-output signal that passes through the DPD calculator 720.
  • a second AGC controller 750 for performing second ACG processing on the to-be-output signal that passes through the DPD calculator 720.
  • the power amplifier 740 can also be used to adjust the output power of the signal to be output that passes through the DPD calculator 720 based on the OBO value obtained by the OBO value calculator 730 and the preset amplification factor.
  • the power amplifier 740 is further configured to adjust the output power to a first value, where the first value is subtracted from a product of the output power and the preset amplification factor.
  • the OBO value is obtained.
  • the power amplifier 740 is further configured to adjust the output power to a first value if the product of the output power and the preset amplification factor is greater than the first threshold.
  • the power amplifier 740 is further configured to adjust an output power of the signal to be output that passes through the DPD calculator 720 based on an OBO value, a preset amplification factor, and an adjustment amount fed back by the signal receiving end.
  • the power amplifier 740 is further configured to adjust the output power to a second value, where the second value is obtained by subtracting the OBO value according to a third value, where the third value is obtained. It is obtained by adding the product of the output power before the adjustment to the preset amplification factor and adding the adjustment amount.
  • the power amplifier 740 is further configured to adjust the output power to the second value if the third value is greater than a first threshold.
  • the OBO value calculator 730 can also be used to calculate the OBO value according to equation (1).
  • the first threshold is the maximum power used when transmitting the DPD-processed signal to be output under the lowest traffic.
  • the power adjustment apparatus 700 may further include:
  • the separator 760 is configured to acquire a CPRI data stream, where the CPRI data stream includes an I/Q signal and a CW signal, and separate the I/Q signal and the CW signal in the CPRI data stream.
  • a mapper 770 is configured to encode and map the CW signal passing through the splitter 760 to obtain a mapped signal.
  • the compressor 780 is configured to perform compression filtering on the I/Q signal passing through the splitter 760.
  • the multiplexer 790 is configured to combine the mapping signal passing through the mapper 770 and the I/Q signal passing through the compressor 780 to obtain a signal to be output.
  • the power adjustment apparatus 700 can perform the action of the signal transmitting end in the method provided by the embodiment of the present application. Here, in order to avoid redundancy, detailed description thereof is omitted.
  • the power adjustment apparatus 800 provided in the embodiment of the present application is used to implement the function of the signal transmitting end in the method provided by the embodiment of the present application.
  • the device 800 includes a processor 820 for implementing the function of the signal transmitting end in the method provided by the embodiment of the present application.
  • the processor 820 may be configured to obtain a signal to be output, perform a first AGC process on the output signal, obtain a signal to be output processed by the first AGC, and obtain a gain value of the signal to be output, etc., refer to the method.
  • the detailed description in the examples is not described here.
  • Apparatus 800 can also include a memory 830 for storing program instructions and/or data.
  • Memory 830 is coupled to processor 820.
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, and may be in an electrical, mechanical or other form for information interaction between devices, units or modules.
  • Processor 820 may operate in conjunction with memory 830.
  • Processor 820 may execute program instructions stored in memory 830.
  • the processor 820 can be implemented by hardware or by software. When implemented by hardware, the processor 820 can be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor 820 can be a general-purpose processor.
  • the memory 830 can be integrated into the processor 820 by reading the software code stored in the memory 830, and can exist outside the processor 820 and exist independently.
  • the device 800 can also include a transceiver 810 for communicating with other devices over a transmission medium such that devices for use in the device 800 can communicate with other devices.
  • the processor 820 can utilize the transceiver 810 to transmit and receive signals, and is used to implement the method performed by the signal transmitting end in the method embodiment of the present application.
  • the transceiver 810 may also be referred to as a transceiver unit, a transceiver, or a transceiver circuit or the like.
  • the transceiver 810 can include a control circuit and an antenna, wherein the control circuit can be used for converting baseband signals and radio frequency signals and processing the radio frequency signals, and the antenna can be used to transmit and receive radio frequency signals.
  • connection medium between the above transceiver 810, the processor 820, and the memory 830 is not limited in the embodiment of the present application.
  • the memory 830, the processor 820, and the transceiver 810 are connected by a bus 840 in FIG. 8.
  • the bus is indicated by a thick line in FIG. 8, and the connection manner between other components is only schematically illustrated. , not limited to.
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 8, but it does not mean that there is only one bus or one type of bus.
  • the processor may be a central processing unit (CPU), a general-purpose processor network processor (NP), a digital signal processing (DSP), a microprocessor. , a microcontroller, a programmable logic device (PLD), or any combination thereof.
  • CPU central processing unit
  • NP general-purpose processor network processor
  • DSP digital signal processing
  • microprocessor e.g., a microcontroller
  • PLD programmable logic device
  • the memory may be a volatile memory, such as a random-access memory (RAM); the memory may also include a non-volatile memory, such as A flash memory, a hard disk drive (HDD) or a solid-state drive (SSD); the memory may also be a combination of the above types of memories.
  • RAM random-access memory
  • the memory may also include a non-volatile memory, such as A flash memory, a hard disk drive (HDD) or a solid-state drive (SSD); the memory may also be a combination of the above types of memories.
  • the memory may be any other medium that can be used to carry or store desired program code in the form of an instruction or data structure and that can be accessed by a computer, but is not limited thereto.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the method provided by the embodiment of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented in software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, a network device, a user device, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transmission to another website site, computer, server or data center via wired (eg coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium (eg, an SSD) or the like.
  • a magnetic medium eg, a floppy disk, a hard disk, a magnetic tape
  • an optical medium eg, a digital video disc (DVD)
  • a semiconductor medium eg, an SSD

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Abstract

本申请提供了一种功率调整的方法和装置，其中，该方法包括：获取待输出信号；对待输出信号进行第一自动增益控制AGC处理，得到经过第一AGC处理的待输出信号，以及得到待输出信号的增益值；对经过第一AGC处理的待输出信号进行数字预失真DPD处理，得到经过DPD处理的待输出信号；根据增益值，计算输出功率回退OBO值；基于OBO值，对经过DPD处理的待输出信号的输出功率进行调整；向信号接收端发送经过功率调整的待输出信号。通过本申请实施例的功率调整的方法和装置，可以提升IMD3频谱以及I/Q信号的EVM性能。

Description

功率调整的方法和装置 技术领域
本申请涉及通信领域，并且更具体地，涉及一种功率调整的方法和装置。
背景技术
云无线接入网(cloud radio access network，C-RAN)是基于集中化的基带单元(baseband unit，BBU)和分布式的射频拉远单元(remote radio unit，RRU)的网络构架，通用公共无线接口(common public radio interface，CPRI)是BBU与RRU之间最主要的接口形式。
传统微波CPRI承载将CPRI中的同相与正交(in-phase and quadrature，I/Q)数据与控制字(control word，CW)均看成比特流进行传输，所需要的带宽资源较大，给CPRI传输管道带来了极大压力。面对这一挑战，出现了高效无线前传(efficient wireless fronthaul，EWF)技术，可以用28MHz频谱带宽在不使用多输入多输出(multi-input multi-output，MIMO)或交叉极化干扰消除(cross-polarization interference cancellation，XPIC)技术的情况下传输约1.228Gbps的CPRI数据，这一传输效率大约是传统微波技术的5倍。
功率放大器(power amplifier，PA)是微波通信系统中最主要的非线性源。由于功率放大器的非线性特性，当信号经过功率放大器后，会产生带内失真，恶化通信系统的性能。数字预失真(digital pre-distortion，DPD)算法针对功率放大器的带内失真信息进行预失真处理，可以减小功率放大器的非线性。
EWF技术和DPD算法相结合时，会出现3阶交调失真(third-order intermodulation distortion，IMD3)频谱性能或者I/Q信号的误差矢量幅度(error vector magnitude，EVM)性能变差的情况。现有技术通过对功率放大器的输出功率固定地进行回退，减小功率放大器的非线性，以提高IMD3频谱性能和I/Q信号的EVM性能。然而，在实际的CPRI承载场景中，CPRI I/Q流量是实时发生变化的，现有技术对功率放大器的输出功率固定地进行回退，并不能有效地提升IMD3频谱性能和I/Q信号的EVM性能。
发明内容
本申请提供一种功率调整的方法和装置，解决了IMD3频谱性能以及I/Q信号的EVM性能无法有效提升的问题。
第一方面，本申请实施例提供了一种功率调整的方法，包括：获取待输出信号；对所述待输出信号进行第一自动增益控制AGC处理，得到经过第一AGC处理的所述待输出信号，以及得到所述待输出信号的增益值；对经过第一AGC处理的所述待输出信号进行数字预失真DPD处理，得到经过DPD处理的所述待输出信号；根据所述增益值，计算输出功率回退OBO值；基于所述OBO值，对经过DPD处理的所述待输出信号的输出功率进行调整；向信号接收端发送经过功率调整的所述待输出信号。
本申请实施例的技术方案，待输出信号的输出功率基于OBO值进行调整，由于OBO值是根据增益值计算的，而增益值和流量对应，因此本申请实施例可以根据流量的变化实时地对待输出信号的输出功率进行调整，以减小功率放大器的非线性，从而提升IMD3频谱性能和I/Q信号的EVM性能。
在一些可能的实现方式中，在所述对经过第一AGC处理的所述待输出信号进行数字预失真DPD处理之后，所述方法还包括：对经过DPD处理的所述待输出信号进行第二ACG处理。
在进行DPD处理之前，对待输出信号进行第一AGC处理，可以调整CPRI I/Q流量不满导致的能量波动，并对经过DPD处理的待输出信号进行第二ACG处理，可以调整DPD处理所输出的能量波动，这样可以将CPRI I/Q流量不满导致的能量波动和DPD处理所输出的能量波动进行解耦，从而提升IMD3频谱性能和传输距离。
在一些可能的实现方式中，所述基于所述OBO值，对经过DPD处理的所述待输出信号的输出功率进行调整，包括：基于所述OBO值和预设放大倍数，对经过DPD处理的所述待输出信号的输出功率进行调整。
在一些可能的实现方式中，所述基于所述OBO值和预设放大倍数，对经过DPD处理的所述待输出信号的输出功率进行调整，包括：将所述输出功率调整为第一取值，所述第一取值是按照所述输出功率与所述预设放大倍数的乘积再减去所述OBO值得到的。
在一些可能的实现方式中，所述将所述输出功率调整为第一取值，包括：若所述输出功率与所述预设放大倍数的乘积大于第一阈值，将所述输出功率调整为第一取值。
将输出功率和预设放大倍数的乘积与第一阈值进行比较，信号发射端可以在输出功率和预设放大倍数的乘积大于第一阈值时对输出功率进行调整，而不是在任何情况下都对输出功率进行调整，避免了输出功率过大或过小的问题，从而可以使输出功率在一个合理的范围内。
在一些可能的实现方式中，所述基于所述OBO值和预设放大倍数，对经过DPD处理的所述待输出信号的输出功率进行调整，还包括：基于所述OBO值、所述预设放大倍数和所述信号接收端反馈的调整量，对经过DPD处理的所述待输出信号的输出功率进行调整。
在一些可能的实现方式中，所述基于所述OBO值、所述预设放大倍数和所述信号接收端反馈的调整量，对经过DPD处理的所述待输出信号的输出功率进行调整，包括：将所述输出功率调整为第二取值，所述第二取值是按照第三取值减所述OBO值得到的，所述第三取值是按照调整前的所述输出功率与所述预设放大倍数的乘积再加所述调整量得到的。
在一些可能的实现方式中，所述将所述输出功率调整为第二取值包括：若所述第三取值大于第一阈值，将所述输出功率调整为所述第二取值。
当第三取值大于第一阈值时，信号发射端可以将输出功率调整为第二取值，这样可以使输出功率在一个合理的范围内，并且可以节省功率，减小功率放大器的非线性。
在一些可能的实现方式中，所述第一阈值为最低流量下发送经过DPD处理的所述待输出信号时所采用的最大功率。
在一些可能的实现方式中，所述OBO值C＝10*lg(1/G^2)，其中，C为所述OBO值， G为所述增益值。
增益值是与流量的变化对应的，根据增益值计算OBO值，使得OBO值也与流量对应。
在一些可能的实现方式中，所述获取同相与正交待输出信号之前，所述方法还包括：获取通用无线公共接口CPRI数据流，所述CPRI数据流中包括同相与正交I/Q信号和控制字CW信号；对所述CPRI数据流中的所述I/Q信号和CW信号进行分离；对分离后的所述CW信号进行编码和映射，得到映射信号；对分离后的所述I/Q信号进行压缩滤波；将所述映射信号和经过压缩滤波的所述I/Q信号复合，得到所述待输出信号。
上述技术方案，将CPIR数据流中的I/Q信号和CW信号分离，经过一定处理后再将它们合路传输，可以使得CPRI的传输速率成倍增加。
第二方面，本申请实施例提供了一种功率调整装置，包括：
第一自动增益控制AGC放大器，用于获取待输出信号，并对所述待输出信号进行第一AGC处理，得到经过第一AGC处理的所述待输出信号，以及得到所述待输出信号的增益值；
数字预失真DPD计算器，用于对经过所述第一AGC放大器的所述待输出信号进行DPD处理，得到经过DPD处理的所述待输出信号；
输出功率回退OBO值计算器，用于根据所述第一AGC放大器获得的所述增益值，计算OBO值；
功率放大器，用于基于所述OBO值计算器得到的所述OBO值，对经过所述DPD计算器的所述待输出信号的输出功率进行调整，并向信号接收端发送经过功率调整的所述待输出信号。
在一些可能的实现方式中，所述功率调整装置还包括第二AGC放大器，用于对经过所述DPD计算器的所述待输出信号进行第二ACG处理。
在一些可能的实现方式中，所述功率放大器具体用于：基于所述OBO值计算器得到的所述OBO值和预设放大倍数，对经过所述DPD计算器的所述待输出信号的输出功率进行调整。
在一些可能的实现方式中，所述功率放大器具体用于：将所述输出功率调整为第一取值，所述述第一取值是按照所述输出功率与所述预设放大倍数的乘积再减去所述OBO值得到的。
在一些可能的实现方式中，所述功率放大器具体用于：若所述输出功率与所述预设放大倍数的乘积大于第一阈值，将所述输出功率调整为第一取值。
在一些可能的实现方式中，所述功率调整器具体用于：基于所述OBO值、所述预设放大倍数和所述信号接收端反馈的调整量，对经过所述DPD计算器的所述待输出信号的输出功率进行调整。
在一些可能的实现方式中，所述功率放大器器具体用于：将所述输出功率调整为第二取值，所述第二取值是按照第三取值减所述OBO值得到的，所述第三取值是按照调整前的所述输出功率与所述预设放大倍数的乘积再加所述调整量得到的。
在一些可能的实现方式中，所述功率放大器器具体用于：若所述第三取值大于第一阈值，将所述输出功率调整为所述第二取值。
在一些可能的实现方式中，所述第一阈值为最低流量下所述发送经过DPD处理的待 输出信号时所采用的最大功率。
在一些可能的实现方式中，所述OBO值C＝10*lg(1/G^2)，其中，C为所述OBO值，G为所述增益值。
在一些可能的实现方式中，所述功率调整装置还包括：
分离器，用于获取通用无线公共接口CPRI数据流，所述CPRI数据流中包括同相与正交I/Q信号和控制字CW信号，并将所述CPRI数据流中的所述I/Q信号和CW信号进行分离；
映射器，用于对经过所述分离器的所述CW信号进行编码和映射，得到映射信号；
压缩器，用于对经过所述分离器的所述I/Q信号进行压缩滤波；
复用器，用于将经过所述映射器的所述映射信号和经过所述压缩器的所述I/Q信号复合，得到所述待输出信号。
第三方面，本申请实施例还提供了一种功率调整装置，所述功率调整装置包括处理器，用于实现上述第一方面描述的方法中的功能。该功率调整装置还可以包括存储器，用于存储程序指令和数据。所述存储器与所述处理器耦合，所述处理器可以调用并执行所述存储器中存储的程序指令，用于实现上述第一方面描述的方法中功率调整装置的功能。所述功率调整装置还可以包括收发器，用于接收待输出信号接收端反馈的待输出信号的接收功率。
第四方面，本申请实施例提供了一种RRU，用于执行上述第一方面或第一方面的任意可能的实现方式中的方法。
第五方面，本申请实施例提供了一种BBU，用于执行上述第一方面或第一方面的任意可能的实现方式中的方法。
第六方面，本申请实施例提供了一种基站，该基站包括RRU或BBU，该RRU或BBU用于执行上述第一方面或第一方面的任意可能的实现方式中的方法。
第七方面，本申请实施例提供了一种计算机存储介质，该存储介质中存储程序指令，该程序指令在被一个或多个处理器读取并执行时可实现第一方面所述的方法。
第八方面，本申请实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第一方面所述的方法。
第九方面，本申请实施例提供了一种系统，所述系统包括第二方面所述的功率调整装置。
附图说明
图1是本申请实施例提供的一种网络架构示意图；
图2是本申请实施例提供的功率调整的方法的示意性流程图；
图3是本申请实施例提供的EWF技术与远端DPD算法相结合的结构图；
图4是本申请实施例提供的EWF技术与近端DPD算法相结合的结构图；
图5是本申请实施例提供的第一AGC放大器的结构图；
图6是本申请另一实施例提供的EWF技术与远端DPD算法相结合的结构图；
图7是本申请实施例提供的功率调整装置的示意性框图；
图8是本申请实施例提供的功率调整装置的示意性框图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(global system of mobile communication，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、未来的第五代(5th generation，5G)系统或新无线(new radio，NR)等。
应理解，本申请实施例仅以微波通信为例对本申请实施例提供的技术方案进行说明，但本申请并不限于此，本申请实施例的技术方案可以应用于各种无线通信系统中。
图1为可以应用本申请实施例的基站一种网络架构示意图。如图1所示，该基站可以包括BBU、RRU，BBU和RRU之间通过CPRI进行基带数据的传输，BBU通常集中布放在机房，RRU则布放在远端，一个BBU可以连接多个RRU。BBU主要完成信号的基带处理(如信道编解码、调制解调)，提供传输管理及接口，管理无线资源，提供时钟信号等功能。RRU主要完成信号的中频处理(如数字I/Q调制解调、上下变频、DA/AD转换)、射频处理、双工等功能。
本申请实施例涉及到的基站(base station，BS)，是一种部署在无线接入网中可以和终端进行无线通信的设备。其中，基站可能有多种形式，比如宏基站、微基站、中继站和接入点等。示例性地，本申请实施例涉及到的基站可以是5G系统中的基站或LTE系统中的基站，其中，5G系统中的基站还可以称为发送接收点(transmission reception point，TRP)或下一代基站(generation NodeB，gNB)
EWF技术与DPD算法相结合时，会出现IMD3频谱性能和I/Q信号的EVM性能变差的情况。IMD3频谱性能变差会使微波的传输距离降低；I/Q信号的EVM性能变差，微波传输将难以支持较高的调制方式。
鉴于此，本申请实施例提供了一种技术方案，可以根据流量地实时变化自动地进行功率调整，从而提升IMD3频谱性能以及I/Q信号的EVM性能。
应理解，本申请实施例对EWF技术的名称并不限定，也就是说，它还可以表述为其它名称，如高效CPRI承载技术。
图2是根据本申请实施例的功率调整的方法的示意性流程图。图2的方法可以由信号发射端执行。可选地，信号发射端可以为BBU，也可以为RRU，本申请对此不作限定。
图2的方法可以包括210-260，下面分别对210-260进行详细描述。
在210中，获取待输出信号。
DPD算法可以包括远端DPD算法和近端DPD算法。示例性地，根据本申请实施例的EWF技术与远端DPD算法相结合的结构图可以如图3所示，EWF技术与近端DPD算法相结合的结构图可以如图4所示。
参见图3和图4，信号发射端可以将CPRI数据流输入分离器，其中，CPRI数据流可 以包括I/Q信号和CW信号，在分离器中信号发射端可以将输入的CPRI数据流中的I/Q信号和CW信号进行分离。
可选地，信号发射端可以利用频分复用技术，根据I/Q信号和CW信号频率的不同将CPRI数据流中的I/Q信号和CW信号进行分离。
分离后的I/Q信号可以进入压缩器，信号发射端在压缩器中可以对分离后的I/Q信号进行压缩滤波处理，得到压缩信号；分离后的CW信号可以进入映射器，信号发射端可以在映射器中对分离后的CW信号进行编码处理和映射处理，得到映射信号。
示例性地，映射方法可以包括二进制相移键控(binary phase shift keying，BPSK)、正交相移键控(quadrature phase shift keyin，QPSK)、16正交振幅调制(quadrature amplitude modulation，QAM)、64QAM、256QAM和1024QAM等。其中，映射方法还可以称为映射机制或者其它名称，本申请不做限制。
信号发射端可以将压缩信号和映射信号输入复用器，在复用器中经过一些可能的复用处理，可以将压缩信号和映射信号复合到一起，得到待输出信号。
应理解，本申请实施例中，复用处理可以遵循以下原则之一：时分复用(time division multiplexing，TDM)、频分复用(frequency division multiplexing，FDM)、码分复用(code division multiplexing，CDM)或波分复用(wavelength division multiplexing，WDM)。
可选地，复用器可以为时分多路复用器。
可选地，复用器可以为频分多路复用器。
信号发射端将CPRI数据流中的I/Q信号和CW信号分离，经过一定处理后再将它们合路传输，可以使得微波的传输速率成倍增加。
在220中，对待输出信号进行第一自动增益控制(automatic gain control，AGC)处理，得到经过第一AGC处理的待输出信号，以及得到待输出信号的增益值。
继续参见图3和图4，待输出信号进入第一AGC放大器，在第一AGC放大器中信号发射端对待输出信号进行第一AGC处理，可以得到经过第一AGC处理的待输出信号，以及可以得到待输出信号的增益值。
第一AGC放大器的结构可以有很多种，本申请实施例对此不作具体限定。可选地，第一AGC放大器的结构可以如图5所示。应理解，图5仅是示例，不构成对本申请实施例的限定。
图5中，输入信号为待输出信号，输出信号为经过第一AGC处理的待输出信号，参考信号可以取1。
具体地，待输出信号与增益值相乘，可以得到经过第一AGC处理的待输出信号。经过第一AGC处理的待输出信号可以反馈到第一功率计算器，在第一功率计算器中，信号发射端对经过第一AGC处理的待输出信号进行功率计算。参考信号可以进入第二功率计算器，在第二功率计算器中，信号发射端对参考信号进行功率计算。第一功率计算器的输出信号和第二功率计算器的输出信号可以在减法器中相减，相减得到的信号可以进入低通滤波器，低于截止频率的信号可以通过低通滤波器，高于截止频率的信号不能通过低通滤波器。
该低通滤波器可以有很多种，本申请实施例对此不做具体限定。例如，低通滤波器可以包括以下中的一种：巴特沃斯滤波器、切比雪夫滤波器。
通过低通滤波器的信号可以进入累加器，在累加器中进行一些可能的处理后可以得到待输出信号的增益值。
具体而言，在待输出信号较弱时，第一AGC处理可以对应线性放大电路工作，使经过第一AGC处理的待输出信号的输出幅度升高；在待输出信号达到一定强度时，第一AGC处理可以对应压缩放大电路工作，使经过第一AGC处理的待输出信号的输出幅度降低。
本申请实施例中，第一AGC处理可以调整CPRI I/Q流量不满导致的能量波动。
在230中，对经过第一AGC处理的待输出信号进行DPD处理，得到经过DPD处理的待输出信号。
本申请实施例中，DPD处理可以包括DPD计算和DPD系数更新。其中，DPD计算可以在DPD计算器中实现，DPD计算器可以在功率放大器前部，并且与功率放大器级联；DPD系数更新可以在DPD系数更新器中实现，DPD系数更新器可以在信号发射端，也可以在信号接收端。
在一种实现方式下，对于远端DPD算法，可以参见图3。信号发射端可以通过传输信道将经过功率调整的信号发送给信号接收端，信号接收端接收到该信号后，可以在第三AGC控制器中对该信号进行第三AGC处理。信号接收端可以对经过第三AGC处理的信号进行同步和均衡处理，得到均衡后的信号，均衡后的信号可以输入判决器，在判决器中，信号接收端可以根据星座图判断均衡后的信号属于哪个象限，从而可以得到期望信号。期望信号和均衡后的信号进入DPD系数更新器，信号接收端可以在DPD系数更新器中对DPD系数进行自适应更新。
可选地，信号接收端可以采用最小均方(least mean square，LMS)算法对DPD系数进行自适应更新。
可选地，信号接收端可以采用递归最小二乘(recursive least square，RLS)算法对DPD系数进行自适应更新。
可选地，信号接收端可以采用LMS和RLS的各种可能的变形和优化算法对DPD系数进行自适应更新，本申请对此不作限定。
信号接收端在DPD系数更新器中将DPD系数更新好之后，可以通过回传通道将更新好的系数传送到信号发射端，信号发射端在接收到信号接收端发送的更新好的系数后，可以在DPD计算器中根据更新好的系数对经过第一AGC处理的待输出信号进行预失真处理。
在一种实现方式下，对于近端DPD算法，可以参见图4。经过功率调整的信号可以进入第三AGC控制器，信号发射端在第三AGC控制器中，可以对经过功率调整的信号进行第三AGC处理，经过第三AGC处理的信号可以进入DPD系数更新器和DPD计算器2。DPD计算器1的输出与DPD计算器2的输出可以进入误差计算器，信号发射端可以在误差计算器中，根据DPD计算器1的输出与DPD计算器2的输出计算误差信号。误差信号和经过第三AGC处理的信号可以进入DPD系数更新器，信号发射端在DPD系数更新器中可以根据误差信号和经过第三AGC处理的信号对DPD系数进行自适应更新。
示例性地，信号发射端可以采用LMS算法或者RLS算法对DPD系数进行自适应更新，也可以采用LMS和RLS的各种可能的变形和优化算法对DPD系数进行自适应更新，本申请对此不作限定。
DPD系数更新好之后，信号发射端可以将更新好的系数送入DPD计算器2和DPD计算器1，在DPD计算器2和DPD计算器1中根据更新好的系数进行DPD处理。
应理解，本申请实施例中，各结构图中各模块之间的前后关系表示逻辑上的关系，除了图中显示的模块之外，各模块之间还可以有其他模块。示例性地，第一AGC放大器和DPD计算器之间还可以有升余弦滚降滤波器等模块。
还应理解，第三AGC控制器的结构和第一AGC放大器的结构可以相同，也可以不同，本申请对此不作限定。
可选地，经过DPD处理的待输出信号可以进入第二AGC控制器，信号发射端在第二AGC控制器中对经过DPD处理的待输出信号进行第二AGC处理。
具体而言，在经过DPD处理的待输出信号较弱时，第二AGC处理可以对应线性放大电路工作，使经过第二AGC处理的待输出信号的输出幅度升高；在经过DPD处理的待输出信号达到一定强度时，第二AGC处理可以对应压缩放大电路工作，使经过第二AGC处理的待输出信号的输出幅度降低。
应理解，第二AGC处理的实现方式对应于第一AGC处理的实现方式，具体可以参见关于第一AGC处理的描述，此处不再赘述。
本申请实施例中，第二AGC控制器的结构可以有很多种，与第一AGC放大器和第三AGC控制器的结构可以相同，也可以不同，本申请对此不作限定。
示例性地，第二AGC控制器结构可以为图5所示的结构。
CPRI流量不满可以导致能量波动，例如，CPRI I/Q信号中可能会包括一些零，这些零可以导致CPRI流量不满，同时I/Q信号的功率是通过计算I/Q信号中所有符号的功率并取平均值得到的，由于计算平均功率时把I/Q信号中的零也算进去了，并且每次流量不满的程度不同，从而会导致能量波动。本申请实施例中，第一AGC放大器可以调整流量不满导致的能量波动，第二AGC控制器可以调整DPD计算器输出的能量波动，这样可以将DPD计算器输出的能量波动和流量不满导致的能量波动进行解耦，从而可以提升IMD3频谱性能和微波的传输距离。
在240中，根据增益值，计算输出功率回退(output power backoff，OBO)值。
信号发射端在第一AGC放大器中对待输出信号进行第一AGC处理得到的增益值，可以进入OBO值计算器，信号发射端可以在OBO值计算器中计算OBO值。
本申请实施例中，OBO值和增益值可以为对应关系，即增益值越大，OBO值越小。可选地，这种对应关系可以表示为公式(1)：
C＝10*lg(1/G^2)   (1)
其中，C表示OBO值，G表示增益值。
可选地，OBO值和增益值的正比关系也可以表示为公式(2)：
C＝10*lg(1/G^2)+H   (2)
其中，H表示常数。上述技术方案，由于增益值与流量一一对应，即流量越低，增益值越大，根据增益值计算OBO值，这样可以使得OBO值也与流量成对应关系，即流量越低，OBO值越小。
在250中，基于OBO值，对经过DPD处理的待输出信号的输出功率进行调整。
在OBO值计算器中计算得到的OBO值进入功率放大器，信号发射端可以基于输入的 OBO值对经过DPD处理的待输出信号的输出功率进行调整。
在一种实现方式下，信号发射端可以基于OBO值和预设放大倍数，对经过DPD处理的待输出信号的输出功率进行调整。
作为一种示例，信号发射端可以将输出功率调整为第一取值，其中，该第一取值是按照输出功率与预设放大倍数的乘积再减去OBO值得到的。
可选地，若输出功率与预设放大倍数的乘积大于第一阈值a，信号发射端可以将输出功率调整为第一取值。
在本申请实施例中，可以令a为最低流量下发送经过DPD处理的待输出信号时所采用的最大功率。
可选地，最低流量可以表示为CPRI I/Q信号流量为零的情况，即此时CPRI数据流中只有CW信号。当然，最低流量也不排除CPRI I/Q信号流量为很小的值的情况。如CPRI I/Q信号流量可以占CPRI数据流的0.01％，也可以为0.2％或0.5％等，本申请对此不作限定。
可选地，信号发射端可以通过测试获得a值。
示例性地，信号发射端可以在CPRI I/Q信号流量为零的情况下，通过测试功率放大器的工作曲线来获得a值。
可选地，信号发射端可以通过计算获取a值。
示例性地，信号发射端可以根据一些可能的方法，通过估算获得a值。
应理解，本申请实施例中的具体的例子只是为了帮助本领域技术人员更好地理解本申请实施例，而非限制本申请实施例的范围。
可选地，信号发射端可以根据预设放大倍数，对输出功率进行放大，然后基于OBO值，对放大后的输出功率进行调整。
可选地，信号发射端可以将放大后的输出功率与a值进行比较，若放大后的输出功率大于a，则信号发射端可以按照OBO值，对放大后的输出功率进行回退。
若放大后的输出功率小于或等于a，则信号发射端对放大后的输出功率可以不做调整。
示例性地，令输出功率为P，预设放大倍数为N，OBO值为C，信号发射端先将输出功率放大N倍，得到放大后的输出功率N*P。若N*P>a，则按照C值对N*P进行回退；若N*P≤a，则N*P不变。
可选地，信号发射端可以直接基于OBO值和预设放大倍数，对输出功率进行调整。
若输出功率与预设放大倍数的乘积小于或等于a，则信号发射端可以将输出功率调整为输出功率与预设放大倍数的乘积。
示例性地，令输出功率为P，预设放大倍数为N，OBO值为C，若N*P>a，则信号发射端可以将输出功率调整为N*P-C；若N*P≤a，则信号发射端可以将输出功率调整为N*P。
在一种实现方式下，信号发射端可以基于OBO值、预设放大倍数与信号接收端反馈的调整量，对经过DPD处理的待输出信号的输出功率进行调整。
应理解，本申请实施例的各种实施方式既可以单独实施，也可以结合实施，本申请实施例对此并不限定。
例如，本申请实施例中信号发射端可以基于OBO值与预设放大倍数，对输出功率进行调整的实施方式，与信号发射端可以基于OBO值、预设放大倍数与信号接收端反馈的 调整量，对输出功率进行调整的实施方式分别可以单独实施，也可以结合实施。下面单独描述信号发射端可以基于OBO值、预设放大倍数与信号接收端反馈的调整量，对输出功率进行调整的实施方式。应理解，除以下描述外，下述实施例还可以参考前述各实施例中的相关描述，以下为了简洁，不再赘述。
图6为根据本申请另一个实施例的EWF技术与远端DPD算法相结合的结构图。如图6所示，信号接收端可以向发射端反馈接收功率。
作为一种示例，信号发射端可以将输出功率调整为第二取值，该第二取值是按照第三取值减OBO值得到的，该第三取值是按照调整前的输出功率与预设放大倍数的乘积再加调整量得到的。
可选地，若第三取值大于a，则信号发射端可以将输出功率调整为第二取值。
可选地，信号发射端可以根据预设放大倍数，对输出功率进行放大，然后基于OBO值和调整量，对放大后的输出功率进行调整。
可选地，当信号接收端反馈的接收功率较小且衰落到某个门限时，若放大后的输出功率与调整量之和大于a，信号发射端可以利用调整量与OBO值之差，对放大后的输出功率进行提升；
若放大后的输出功率与调整量之和小于或等于a，信号发射端可以利用调整量，对放大后的输出功率进行提升。
应理解，此时，调整量为正值，表示对放大后的输出功率进行提升。
示例性地，可以令输出功率为P，预设放大倍数为N，调整量为X，OBO值为C。信号发射端先将输出功率放大N倍，得到放大后的输出功率N*P，如果信号发射端对放大后的输出功率提升了X后，放大后的输出功率还大于a，即10*lg(N*P)+X>a，则信号发射端可以按照X-C值对放大后的输出功率进行提升。
若信号发射端对放大后的输出功率提升了X后，放大后的输出功率小于或等于a，即10*lg(N*P)+X≤a，则信号发射端可以按照X值对放大后的输出功率进行提升。
可选地，当信号接收端反馈的接收功率较大且超过某个门限时，若放大后的输出功率与调整量之和大于a，此时信号发射端可以利用预设调整量与OBO值之差，对放大后的输出功率进行回退；
若放大后的输出功率与调整量之和小于或等于a，信号发射端可以利用调整量对放大后的输出功率进行回退。
应理解，此时，调整量为负值，表示对放大后的输出功率进行回退。
示例性地，可以令输出功率为P，预设放大倍数为N，调整量为Y，OBO值为C。信号发射端先将输出功率放大N倍，放大后的输出功率为N*P，如果信号发射端对放大后的输出功率回退了Y后，放大后的输出功率还大于a，即10*lg(N*P)+Y>a，则信号发射端可以按照Y-C值对放大后的输出功率进行回退。
若信号发射端对放大后的输出功率回退了Y后，放大后的输出功率小于或等于a，即10*lg(N*P)+Y≤a，则信号发射端可以按照Y值对放大后的输出功率进行回退。
可选地，信号发射端可以直接基于OBO值、预设放大倍数以及信号接收端向发射端反馈的调整量，对输出功率进行调整。可选地，当信号接收端反馈的接收功率较小且衰落到某个门限时，若输出功率与预设放大倍数的乘积加调整量的得到的取值大于a，则信号 发射端可以将输出功率调整为该取值与OBO值之差；
若输出功率与预设放大倍数的乘积加调整量的得到的取值小于或等于a，则信号发射端可以将输出功率调整为该取值。
应理解，此时，调整量为正值，表示对输出功率进行提升。
示例性地，可以令输出功率为P，预设放大倍数为N，调整量为X，OBO值为C。若10*lg(N*P)+X>a，则信号发射端可以将输出功率调整为10*lg(N*P)+X-C值。
若10*lg(N*P)+X≤a，则信号发射端可以将输出功率调整为10*lg(N*P)+X值。
可选地，当信号接收端反馈的接收功率较大且超过某个门限时，若输出功率与预设放大倍数的乘积加调整量的得到的取值大于a，则信号发射端可以将输出功率调整为该取值与OBO值之差；
若输出功率与预设放大倍数的乘积加调整量的得到的取值小于或等于a，信号发射端可以将输出功率调整为该取值。
应理解，此时，调整量为负值，表示对放大后的输出功率进行回退。
示例性地，可以令输出功率为P，预设放大倍数为N，调整量为Y，OBO值为C。若10*lg(N*P)+Y>a，则信号发射端可以将输出功率调整为10*lg(N*P)+Y-C值。
若10*lg(N*P)+Y≤a，则信号发射端可以将输出功率调整为10*lg(N*P)+Y值。
应理解，本申请实施例中，信号接收端反馈的调整量与信号接收端向发射端发送的接收功率对应，即一定的接收功率对应一定的调整量。
本申请实施例中，EWF技术与近端DPD算法相结合时，信号发射端基于OBO值、预设放大倍数以及调整量，对经过DPD处理的待输出信号的输出功率进行调整的具体实现方式对应于EWF技术与远端DPD算法相结合的实现方式，具体可以参见图6的描述，此处不再赘述。
在260中，向信号接收端发送经过功率调整的待输出信号。
如图3和图6所示，EWF技术与远端DPD算法相结合时，信号发射端可以向信号接收端发送经过功率调整的待输出信号。
如图4所示，EWF技术与近端DPD算法相结合时，信号发射端可以向信号接收端和第三AGC控制器发送经过功率调整的待输出信号。
应理解，信号接收端和第三AGC控制器接收到的待输出信号的幅度可以相同，也可以不同，本申请对此不作限定。
应理解，在本申请实施例中，“第一”、“第二”以及“第三”仅仅为了区分不同的对象，但并不对本申请实施例的范围构成限制。
本申请实施例，信号发射端可以根据流量的实时变化自动地对待输出信号的输出功率进行调整，以减小功率放大器的非线性，从而可以提升IMD3频谱性能和I/Q信号的EVM性能。
表1和表2分别示出了和已有的其他技术方案相比，采用本申请实施例的技术方案后，IMD3频谱性能和I/Q信号的EVM性能提升量。其中，表1为CPRI I/Q流量为10％时，采用本申请实施例的技术方案后IMD3频谱性能和I/Q信号的EVM性能提升量。表2为CPRI I/Q流量为20％时，采用本申请实施例的技术方案后IMD3频谱性能和I/Q信号的EVM性能提升量。
应理解，EVM性能与表1和表2中的最小均方误差(Minimum square error，MSE)对应。表中QAM传输指的是采用数字256QAM的方式传输CPRI信号。
表1
Figure PCTCN2018076439-appb-000001
表2
Figure PCTCN2018076439-appb-000002
由表1可以看出，在10％CPRI I/Q流量的情况下，不论待输出功率为多大，OBO值都为5dB；由表2可以看出，在20％CPRI I/Q流量的情况下，不论输出功率为多少，OBO值都为4.3dB，由此可以得出，OBO值的大小取决于CPRI I/Q的流量，而与输出功率无关。
由表1和表2可以看出，信号发射端采用本申请实施例的技术方案后，10％和20％的CPRI I/Q流量对应的MSE性能和已有的其他技术方案相比都有提升，并且在输出功率较大的情况下，10％CPRI I/Q流量的MSE性能净提升可以达到1dB。例如，当输出功率为17dBm时，10％CPRI I/Q流量的MSE性能净提升可以达到1.2dB。
由表1和表2还可以看出，信号发射端采用本申请实施例的技术方案后，10％和20％的CPRI I/Q流量对应的IMD3频谱性能的提升较为显著，并且功率待输出信号的输出功率越大，IMD3频谱性能的提升越显著。在10％CPRI I/Q流量的情况下，IMD3频谱性能至少可以提升4dB；在20％CPRI I/Q流量的情况下，IMD3频谱性能至少可以提升5dB。
以上对本申请实施例提供的方法进行了详细描述，为了实现上述本申请实施例提供的方法中的各功能，信号发射端可以包括硬件结构和/或软件模块，以硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各功能。上述各功能中的某个功能以硬件结构、软件模块、还是硬件结构加软件模块的方式来执行，取决于技术方案的特定应用和设计约束条件。
基于与上述方法实施例同样的发明构思，本申请实施例提供了一种功率调整装置，用于实现上述方法中信号发射端的功能。图7是本申请实施例装置的示意性框图。应理解， 图7示出的功率调整装置700仅是示例，本申请实施例的功率调整装置还可以包括其他模块或单元，或者包括与图7中的各个模块的功能相似的模块，或者并非要包括图7中所有模块。
第一AGC放大器710，用于获取待输出信号，并对待输出信号进行第一AGC处理，得到经过第一AGC处理的待输出信号，以及得到待输出信号的增益值。
DPD计算器720，用于对经过第一AGC放大器710的待输出信号进行DPD处理，得到经过DPD处理的待输出信号。
OBO值计算器730，用于根据第一AGC放大器710获得的增益值，计算OBO值。
功率放大器740，用于基于OBO值计算器730得到的OBO值，对经过DPD计算器720的待输出信号的输出功率进行调整，并向信号接收端发送经过功率调整的待输出信号。
可选地，该功率调整装置700还可以包括第二AGC控制器750，用于对经过DPD计算器720的待输出信号进行第二ACG处理。
可选地，该功率放大器740还可以用于基于OBO值计算器730得到的OBO值和预设放大倍数，对经过DPD计算器720的待输出信号的输出功率进行调整。
可选地，该功率放大器740还可以用于将所述输出功率调整为第一取值，所述述第一取值是按照所述输出功率与所述预设放大倍数的乘积再减去所述OBO值得到的。
可选地，该功率放大器740还可以用于若输出功率与预设放大倍数的乘积大于第一阈值，将输出功率调整为第一取值。
可选地，该功率放大器740还可以用于基于OBO值、预设放大倍数和信号接收端反馈的调整量，对经过DPD计算器720的待输出信号的输出功率进行调整。
可选地，该功率放大器740还可以用于将所述输出功率调整为第二取值，所述第二取值是按照第三取值减所述OBO值得到的，所述第三取值是按照调整前的所述输出功率与所述预设放大倍数的乘积再加所述调整量得到的。
可选地，该功率放大器740还可以用于若所述第三取值大于第一阈值，将所述输出功率调整为所述第二取值。
可选地，该OBO值计算器730还可以用于根据公式(1)计算OBO值。
其中，第一阈值为最低流量下发送经过DPD处理的待输出信号时所采用的最大功率。
可选地，该功率调整装置700还可以包括：
分离器760，用于获取CPRI数据流，CPRI数据流中包括I/Q信号和CW信号，并将CPRI数据流中的I/Q信号和CW信号进行分离。
映射器770，用于对经过分离器760的CW信号进行编码和映射，得到映射信号。
压缩器780，用于对经过分离器760的I/Q信号进行压缩滤波。
复用器790，用于将经过映射器770的映射信号和经过压缩器780的I/Q信号复合，得到待输出信号。
应理解，该功率调整装置700可以执行本申请实施例提供的方法中信号发射端的动作，这里，为了避免赘述，省略其详细说明。
如图8所示为本申请实施例提供的功率调整装置800，用于实现本申请实施例提供的方法中信号发射端的功能。装置800包括处理器820，用于实现本申请实施例提供的方法中信号发射端的功能。示例性地，处理器820可以用于获取待输出信号，并对待输出信号 进行第一AGC处理，得到经过第一AGC处理的待输出信号，以及得到待输出信号的增益值等等，具体参见方法示例中的详细描述，此处不做赘述。
装置800还可以包括存储器830，用于存储程序指令和/或数据。存储器830和处理器820耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理器820可能和存储器830协同操作。处理器820可能执行存储器830中存储的程序指令。
处理器820可以通过硬件来实现也可以通过软件来实现，当通过硬件实现时，处理器820可以是逻辑电路、集成电路等；当通过软件来实现时，处理器820可以是一个通用处理器，通过读取存储器830中存储的软件代码来实现，存储器830可以集成在处理器820中，可以位于处理器820之外，独立存在。
装置800还可以包括收发器810，用于通过传输介质和其它设备进行通信，从而用于装置800中的装置可以和其它设备进行通信。处理器820可以利用收发器810收发信号，并用于实现本申请方法实施例中信号发射端所执行的方法。
可选地，收发器810还可以称为收发单元、收发机或者收发电路等等。
可选地，收发器810可以包括控制电路和天线，其中，控制电路可用于基带信号与射频信号的转换以及对射频信号的处理，天线可用于收发射频信号。
本申请实施例中不限定上述收发器810、处理器820以及存储器830之间的具体连接介质。本申请实施例在图8中以存储器830、处理器820以及收发器810之间通过总线840连接，总线在图8中以粗线表示，其它部件之间的连接方式，仅是进行示意性说明，并不引以为限。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图8中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
在本申请实施例中，处理器可以是中央处理器(central processing unit，CPU)，通用处理器网络处理器(network processor，NP)、数字信号处理器(digital signal processing，DSP)、微处理器、微控制器、可编程逻辑器件(programmable logic device，PLD)或它们的任意组合。
在本申请实施例中，存储器可以是易失性存储器(volatile memory)，例如随机存取存储器(random-access memory，RAM)；存储器也可以包括非易失性存储器(non-volatile memory)，例如快闪存储器(flash memory)，硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)；存储器还可以是上述种类的存储器的组合。存储器可以是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。
应理解，在本发明的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组 件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
本申请实施例提供的方法中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、网络设备、用户设备或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机可以存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，数字视频光盘(digital video disc，DVD))、或者半导体介质(例如,SSD)等。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (26)

  1. 一种功率调整的方法，其特征在于，包括：
    获取待输出信号；
    对所述待输出信号进行第一自动增益控制AGC处理，得到经过第一AGC处理的所述待输出信号，以及得到所述待输出信号的增益值；
    对经过第一AGC处理的所述待输出信号进行数字预失真DPD处理，得到经过DPD处理的所述待输出信号；
    根据所述增益值，计算输出功率回退OBO值；
    基于所述OBO值，对经过DPD处理的所述待输出信号的输出功率进行调整；
    向信号接收端发送经过功率调整的所述待输出信号。
  2. 根据权利要求1所述的方法，其特征在于，在所述对经过第一AGC处理的所述待输出信号进行数字预失真DPD处理之后，所述方法还包括：
    对经过DPD处理的所述待输出信号进行第二ACG处理。
  3. 根据权利要求1或2所述的方法，其特征在于，所述基于所述OBO值，对经过DPD处理的所述待输出信号的输出功率进行调整，包括：
    基于所述OBO值和预设放大倍数，对经过DPD处理的所述待输出信号的输出功率进行调整。
  4. 根据权利要求3所述的方法，其特征在于，所述基于所述OBO值和预设放大倍数，对经过DPD处理的所述待输出信号的输出功率进行调整，包括：
    将所述输出功率调整为第一取值，所述第一取值是按照所述输出功率与所述预设放大倍数的乘积再减去所述OBO值得到的。
  5. 根据权利要求4所述的方法，其特征在于，所述将所述输出功率调整为第一取值，包括：
    若所述输出功率与所述预设放大倍数的乘积大于第一阈值，将所述输出功率调整为第一取值。
  6. 根据权利要求3所述的方法，其特征在于，所述基于所述OBO值和预设放大倍数，对经过DPD处理的所述待输出信号的输出功率进行调整，还包括：
    基于所述OBO值、所述预设放大倍数和所述信号接收端反馈的调整量，对经过DPD处理的所述待输出信号的输出功率进行调整。
  7. 根据权利要求6所述的方法，其特征在于，所述基于所述OBO值、所述预设放大倍数和所述信号接收端反馈的调整量，对经过DPD处理的所述待输出信号的输出功率进行调整，包括：
    将所述输出功率调整为第二取值，所述第二取值是按照第三取值减所述OBO值得到的，所述第三取值是按照调整前的所述输出功率与所述预设放大倍数的乘积再加所述调整量得到的。
  8. 根据权利要求7所述的方法，其特征在于，所述将所述输出功率调整为第二取值包括：
    若所述第三取值大于第一阈值，将所述输出功率调整为所述第二取值。
  9. 根据权利要求5或8所述的方法，所述第一阈值为最低流量下发送经过DPD处理的所述待输出信号时所采用的最大功率。
  10. 根据权利要求1至9中任一项所述的方法，其特征在于，所述OBO值C＝10*lg(1/G^2)，其中，C为所述OBO值，G为所述增益值。
  11. 根据权利要求1至10中任一项所述的方法，其特征在于，在所述获取待输出信号之前，所述方法还包括：
    获取通用无线公共接口CPRI数据流，所述CPRI数据流中包括同相与正交I/Q信号和控制字CW信号；
    将所述CPRI数据流中的所述I/Q信号和CW信号进行分离；
    对分离后的所述CW信号进行编码和映射，得到映射信号；
    对分离后的所述I/Q信号进行压缩滤波；
    将所述映射信号和经过压缩滤波的所述I/Q信号复合，得到所述待输出信号。
  12. 一种功率调整装置，其特征在于，包括：
    第一自动增益控制AGC放大器，用于获取待输出信号，并对所述待输出信号进行第一AGC处理，得到经过第一AGC处理的所述待输出信号，以及得到所述待输出信号的增益值；
    数字预失真DPD计算器，用于对经过所述第一AGC放大器的所述待输出信号进行DPD处理，得到经过DPD处理的所述待输出信号；
    输出功率回退OBO值计算器，用于根据所述第一AGC放大器获得的所述增益值，计算OBO值；
    功率放大器，用于基于所述OBO值计算器得到的所述OBO值，对经过所述DPD计算器的所述待输出信号的输出功率进行调整，并向信号接收端发送经过功率调整的所述待输出信号。
  13. 根据权利要求12所述的装置，其特征在于，所述功率调整装置还包括：
    第二AGC放大器，用于对经过所述DPD计算器的所述待输出信号进行第二ACG处理。
  14. 根据权利要求12或13所述的装置，其特征在于，所述功率放大器具体用于：
    基于所述OBO值计算器得到的所述OBO值和预设放大倍数，对经过所述DPD计算器的所述待输出信号的输出功率进行调整。
  15. 根据权利要求14所述的装置，其特征在于，所述功率放大器具体用于：
    将所述输出功率调整为第一取值，所述述第一取值是按照所述输出功率与所述预设放大倍数的乘积再减去所述OBO值得到的。
  16. 根据权利要求15所述的装置，其特征在于，所述功率放大器具体用于：
    若所述输出功率与所述预设放大倍数的乘积大于第一阈值，将所述输出功率调整为第一取值。
  17. 根据权利要求14所述的装置，其特征在于，所述功率放大器具体用于：
    基于所述OBO值、所述预设放大倍数和所述信号接收端反馈的调整量，对经过所述DPD计算器的所述待输出信号的输出功率进行调整。
  18. 根据权利要求17所述的装置，其特征在于，所述功率放大器具体用于：
    将所述输出功率调整为第二取值，所述第二取值是按照第三取值减所述OBO值得到的，所述第三取值是按照调整前的所述输出功率与所述预设放大倍数的乘积再加所述调整量得到的。
  19. 根据权利要求18所述的装置，其特征在于，所述功率放大器具体用于：
    若所述第三取值大于第一阈值，将所述输出功率调整为所述第二取值。
  20. 根据权利要求16或19所述的装置，其特征在于，所述第一阈值为最低流量下发送经过DPD处理的所述待输出信号时所采用的最大功率。
  21. 根据权利要求12至20中任一项所述的装置，其特征在于，所述OBO值C＝10*lg(1/G^2)，其中，C为所述OBO值，G为所述增益值。
  22. 根据权利要求12至21中任一项所述的装置，其特征在于，所述功率调整装置还包括：
    分离器，用于获取通用无线公共接口CPRI数据流，所述CPRI数据流中包括同相与正交I/Q信号和控制字CW信号，并将所述CPRI数据流中的所述I/Q信号和CW信号进行分离；
    映射器，用于对经过所述分离器的所述CW信号进行编码和映射，得到映射信号；
    压缩器，用于对经过所述分离器的所述I/Q信号进行压缩滤波；
    复用器，用于将经过所述映射器的所述映射信号和经过所述压缩器的所述I/Q信号复合，得到所述待输出信号。
  23. 一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得所述计算机执行如权利要求1至11中任一项所述的方法。
  24. 一种射频拉远单元RRU，所述RRU用于执行如权利要求1至11中任一项所述的方法。
  25. 一种基带单元BBU，所述BBU用于执行如权利要求1至11中任一项所述的方法。
  26. 一种基站，所述基站包括射频拉远单元RRU或基带单元BBU，所述RRU或BBU用于执行如权利要求1至11中任一项所述的方法。
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