WO2012163054A1 - 一种微波预失真信号生成方法和装置 - Google Patents

一种微波预失真信号生成方法和装置 Download PDF

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Publication number
WO2012163054A1
WO2012163054A1 PCT/CN2011/082282 CN2011082282W WO2012163054A1 WO 2012163054 A1 WO2012163054 A1 WO 2012163054A1 CN 2011082282 W CN2011082282 W CN 2011082282W WO 2012163054 A1 WO2012163054 A1 WO 2012163054A1
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Prior art keywords
signal
coefficient
received signal
order
predistortion
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PCT/CN2011/082282
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English (en)
French (fr)
Inventor
庞彦钊
石华平
陈松
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to EP11867091.8A priority Critical patent/EP2770684B1/en
Priority to PCT/CN2011/082282 priority patent/WO2012163054A1/zh
Priority to CN201180002499.4A priority patent/CN102511153B/zh
Publication of WO2012163054A1 publication Critical patent/WO2012163054A1/zh
Priority to US14/280,136 priority patent/US9008153B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04B1/62—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 for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • 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
    • H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
    • 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
    • H03F1/3258—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits based on polynomial terms
    • 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
    • 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
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/58—Compensation for non-linear transmitter output
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
    • 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
    • H03F2201/3215—To increase the output power or efficiency
    • 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
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
    • H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
    • H04L27/368—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion adaptive predistortion

Definitions

  • the present invention relates to the field of wireless technologies, and in particular, to a microwave predistortion signal generating method and apparatus. Background technique
  • Microwave technology directly transmits data through space, without the need to lay fiber or cable, etc. It has obvious engineering advantages in cities, remote areas or special areas such as rivers; microwave technology is convenient for networking, flexible in use, and short in service opening time; With the development of microwave technology, the cost of microwave equipment is gradually decreasing. Therefore, the use of microwave technology is becoming more and more widespread.
  • Power Amplifier is a key component of microwave communication systems.
  • Non-linearity is an inherent feature of power amplifiers.
  • the singlet method of reducing the influence of power amplifier nonlinearity on the microwave communication system is to reduce the input power of the power amplifier, that is, the power input power is retracted.
  • the cost of this method is to reduce the maximum size of the outdoor unit (Outdoor Uni t, 0DU) of the microwave communication system. Transmit power while reducing the power efficiency of the amplifier.
  • Another more efficient method is the predistortion technique.
  • the method can reduce the nonlinear influence of the power amplifier, and can also increase the maximum transmission power of the microwave system 0DU and improve the power amplifier efficiency of the power amplifier.
  • the prior art predistortion technique uses the signal received by the microwave receiver to be fed back to the microwave transmitter for predistortion calculation, and needs to add a complete signal feedback device from the radio frequency to the baseband, which realizes high cost. Summary of the invention
  • Embodiments of the present invention provide a method and apparatus for generating a microwave predistortion signal, which can reduce the cost of microwave predistortion.
  • An embodiment of the present invention provides a method for generating a microwave predistortion signal, including:
  • the microwave receiver performs channel compensation on the first received signal to obtain a second received signal;
  • the microwave receiver estimates a first transmit signal according to the second received signal, where the first transmit signal is a transmit signal before the digital-to-analog conversion of the microwave transmitter;
  • the microwave receiver performs predistortion coefficient calculation according to the second received signal and the first transmit signal; the microwave receiver uses the first order coefficient calculated by the predistortion coefficient to perform linear distortion compensation on the second received signal before estimating the first transmit signal;
  • the microwave receiver transmits pre-distortion coefficients other than the first-order coefficients to the microwave transmitter such that the microwave transmitter non-linearly predistorts the transmitted signal using pre-distortion coefficients other than the first-order coefficients.
  • An embodiment of the present invention provides a microwave predistortion signal generating apparatus, where the apparatus is located in a microwave receiver, and the apparatus includes:
  • An analog to digital conversion unit configured to perform analog to digital conversion to obtain a first received signal
  • a channel compensation unit configured to perform channel compensation on the first received signal to obtain a second received signal
  • an estimating unit configured to estimate a first transmit signal according to the second received signal, where the first transmit signal is a digital transmit mode The transmitted signal before conversion
  • a pre-distortion coefficient calculation unit configured to perform pre-distortion coefficient calculation according to the second received signal and the first transmit signal
  • a first-order coefficient compensation unit configured to perform linear distortion compensation on the second received signal before estimating the first transmit signal by using the first-order coefficient calculated by the pre-distortion coefficient
  • a pre-distortion coefficient transmitting unit is configured to send the pre-distortion coefficients other than the first-order coefficients to the microwave transmitter, so that the microwave transmitter performs nonlinear pre-distortion on the transmitted signal by using other pre-distortion coefficients than the first-order coefficients.
  • the microwave receiver receives the first received signal after the analog-to-digital conversion, and the microwave receiver performs channel compensation on the first received signal to obtain a second received signal, and the microwave receiver estimates the first according to the second received signal.
  • the first transmit signal is a transmit signal before digital-to-analog conversion of the microwave transmitter
  • the microwave receiver performs pre-distortion coefficient calculation according to the second received signal and the first transmit signal
  • the microwave receiver calculates the pre-distortion coefficient First-order coefficient pair estimates the first emission
  • the second received signal before the signal is linearly compensated, and the microwave receiver transmits a predistortion coefficient other than the first order coefficient to the microwave transmitter, so that the microwave transmitter transmits the predistortion coefficient pair other than the first order coefficient.
  • the signal is subjected to nonlinear predistortion.
  • the first received signal is an analog-to-digital converted signal, that is, the receiving of the first received signal does not require the microwave receiver to add an additional channel, and the receiving channel of the microwave receiver can be used, which can greatly reduce the cost, and the microwave receiver pre- Estimating the transmitted signal and calculating the pre-distortion coefficient only requires transmitting the pre-distortion coefficient to the microwave transmitter, and does not require the microwave transmitter to perform pre-distortion coefficient calculation, thereby improving the pre-distortion efficiency.
  • FIG. 1 is a schematic flowchart of a method for generating a microwave predistortion signal according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a microwave system according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a microwave predistortion signal generating apparatus according to an embodiment of the present invention. detailed description
  • FIG. 1 is a schematic flowchart diagram of a method for generating a microwave predistortion signal according to an embodiment of the present invention.
  • the microwave receiver receives the first received signal after analog-to-digital conversion
  • the microwave receiver performs channel compensation on the first received signal to obtain a second received signal.
  • the microwave receiver estimates a first transmit signal according to the second received signal, where the first transmit signal is a transmit signal before the digital-to-analog conversion of the microwave transmitter;
  • the microwave receiver performs predistortion coefficient calculation according to the second received signal and the first transmit signal. 5105. The microwave receiver uses the first-order coefficient calculated by the pre-distortion coefficient to perform linear distortion compensation on the second received signal before estimating the first transmit signal.
  • the microwave receiver transmits a pre-distortion coefficient other than the first-order coefficient to the microwave transmitter, so that the microwave transmitter performs nonlinear pre-distortion on the transmitted signal by using a pre-distortion coefficient other than the first-order coefficient.
  • the microwave receiver receives the first received signal after the analog-to-digital conversion, performs channel compensation on the first received signal, obtains a second received signal, and estimates a first transmit signal according to the second received signal, where the A transmitting signal is a transmitting signal before digital-to-analog conversion of the microwave transmitter, and pre-distortion coefficient is calculated according to the second received signal and the first transmitted signal, and the first-order coefficient calculated by using the pre-distortion coefficient is used to estimate the first transmitted signal before
  • the second received signal is linearly compensated, and the predistortion coefficients other than the first order coefficients are sent to the microwave transmitter, so that the microwave transmitter performs nonlinear predistortion on the transmitted signal by using other predistortion coefficients than the first order coefficients.
  • the first received signal is an analog-to-digital converted signal, that is, the receiving of the first received signal does not require the microwave receiver to add an additional channel, and the receiving channel of the microwave receiver can be used, which can greatly reduce the cost, and the microwave receiver pre- Estimating the transmitted signal and calculating the pre-distortion coefficient only requires transmitting the pre-distortion coefficient to the microwave transmitter, and does not require the microwave transmitter to perform pre-distortion coefficient calculation, thereby improving the pre-distortion efficiency.
  • FIG. 2 is a schematic diagram of a microwave system according to an embodiment of the present invention.
  • the microwave system includes a microwave transmitter and a microwave receiver, the microwave transmitter transmits a microwave signal, and the microwave receiver receives the microwave signal.
  • the microwave transmitter has the microwave receiving function at the same time, and the microwave receiver has the microwave transmitting function at the same time.
  • the microwave transmitter and the microwave receiver are distinguished, and the microwave receiver is sent to the microwave transmitter.
  • the predistortion method and apparatus for microwave signals are similar.
  • the baseband signal X1 (n) in the microwave transmitter first forms a predistortion signal Z1 (n) through a predistorter, which may be, for example, a digital baseband predistorter, which is converted to an analog domain by a digital to analog converter and subjected to upconversion processing.
  • the power amplifier is then transmitted to the microwave receiver; the microwave receiver receives the signal from the microwave transmitter, performs down-conversion processing, and then receives the first reception through the analog-to-digital converter.
  • the channel compensator performs channel compensation on the first received signal to obtain a second received signal y(n), the channel compensation may include carrier recovery, channel equalization, and I/Q imbalance correction, etc.
  • the estimating unit is configured according to the second received signal y (n) estimating a first transmit signal x(n), the first transmit signal being a transmit signal before digital-to-analog conversion of the microwave transmitter, and x(n) and Xl (n) are the same signal, but the delay is different.
  • the estimation unit can be implemented by using a hard-segment unit.
  • the signal transmitted by the microwave transmitter is at the ideal constellation point of the constellation diagram, and the signal received by the microwave receiver deviates from the ideal constellation point of the constellation due to nonlinear factors and the like, and the hard-segment unit is used according to the interval determination.
  • An ideal constellation point, thereby estimating a first transmitted signal x(n) the predistortion coefficient calculator calculating based on the second received signal y(n) and the first transmitted signal x(n) to obtain a predistortion coefficient, predistortion
  • the goal of the coefficient is to make the difference between the second received signal y(n) and the first transmitted signal x(n) small.
  • the channel compensator Since the channel compensator is affected by the compensation channel, there will be a small amount of linear distortion residual. These residual linear distortions may be phase distortion, etc. These residual linear distortions cause the predistortion coefficient to drift.
  • the inventors After long-term theoretical and experimental research, the inventors have found that the second received signal before the first transmitted signal can be linearly compensated using the first-order coefficient in the pre-distortion coefficient. In the embodiment of the present invention, the first-order coefficient is fed back. To the input of the estimation unit, the residual linear distortion compensation of the input of the estimation unit is realized, which greatly enhances the stability of the predistortion system.
  • the feedback channels are fed back to the microwave transmitter.
  • the microwave overhead channel can be used.
  • the microwave receiver can transmit the microwave signal to the microwave transmitter, and the microwave transmitter uses the first-order coefficient.
  • Other predistortion coefficients than others perform nonlinear predistortion on the transmitted signal.
  • the microwave transmitter predistorter does not work, that is, the predistortion coefficient other than the first order coefficient is zero, and the signal Xl (n) does not predistort directly to the power amplifier, and the signal is caused by the nonlinear action of the power amplifier. Distortion occurs, the microwave receiver corrects the linear distortion by using a first-order coefficient, and transmits pre-distortion coefficients other than the first-order coefficients to the microwave transmitter, and the predistorter of the microwave transmitter uses these coefficients for pre-distortion, and these pre-distortion After the signal arrives at the power amplifier, it can compensate the nonlinearity of the power amplifier.
  • the microwave receiver can receive Compensating the non-linear microwave signal of the power amplifier, calculating the predistortion coefficient again and transmitting it to the microwave transmitter, the predistorter of the microwave transmitter pre-distorting using these coefficients, and thus repeating until the second received signal y(n) and The difference in the first transmitted signal x(n) is below a certain threshold or some other requirement is reached, and the nonlinearity of the power amplifier is compensated.
  • the calculation of the predistortion coefficient is related to the polynomial model of the predistortion of the microwave transmitter.
  • the microwave transmitter uses a memoryless polynominal model for predistortion.
  • the formula of the model is:
  • Xl (n) is the signal before the nth pre-distortion
  • Zl (n) is the signal after the nth pre-distortion
  • C k (n) is the n-th k-th pre-distortion coefficient
  • k is greater than 0.
  • An integer, n is an integer greater than 0.
  • pre-distortion is performed using both pre-distortion coefficients of odd-order and even-order orders.
  • the microwave transmitter does not receive the first-order pre-distortion coefficient ( ⁇ (11) from the microwave receiver.
  • d(n) can be set to a constant according to requirements, for example, Directly set to 1, the first-order predistortion coefficient d(n) does not contribute to the nonlinear predistortion.
  • the microwave receiver uses the calculated first-order predistortion coefficient d(n) pair to estimate the second before the first transmitted signal. The received signal is linearly compensated to enhance the stability of the predistortion system.
  • polynomial models may be used to predistort the signal, for example, may be predistorted using a Volterra series polynomial model or other collapsed model of a Volterra series polynomial model.
  • the calculation formula of the predistortion coefficient is:
  • C k (n+1) C k (n) + u k conj( X (n))
  • C k (n+1) is the n+1th kth predistortion coefficient
  • C k (n) is the nth kth predistortion coefficient
  • u k is the step size of the coefficient update
  • x(n) is The first transmitted signal
  • y(n) is the second received signal
  • conj(x(n)) is the conjugate of the first transmitted signal
  • k is an integer greater than
  • n is an integer greater than zero.
  • the initial value d(0) of the first-order coefficient may be l+0j
  • the initial value C k (0) of the other pre-distortion coefficients outside the-order coefficient may be zero.
  • the predistortion coefficient calculation may be performed according to the second received signal and the first transmit signal according to the second formula, and the second formula is specifically:
  • C k (n+1) C k (n) + a conj(x(n))lx(n)l k — 1 ((x(n)-y(n))
  • C k (n+1) is the n+1th time!
  • the order predistortion coefficient C k (n) is the nth kth predistortion coefficient
  • ⁇ is the step size of the coefficient update
  • ⁇ ( ⁇ ) is the first transmitted signal
  • y(n) is the second received signal
  • conj (x(n)) is the conjugate of the first transmitted signal
  • k is an integer greater than
  • n is an integer greater than zero.
  • the calculation formula of the first-order coefficient is specifically:
  • Ci(n+1) Ci(n) + Ui conj(x(n))( x(n)-y(n))
  • d(n+l) is the n+1th first order coefficient
  • d(n) is the nth first order predistortion coefficient
  • Ul is the step size of the coefficient update
  • x(n) is the first transmitted signal
  • y(n) is the second received signal
  • conj(x(n)) is the conjugate of the first transmitted signal
  • n is an integer greater than zero.
  • the pre-distortion coefficient calculated in this embodiment may be a first-order coefficient and an even-order pre-distortion coefficient, and may further include an odd-order pre-distortion coefficient, wherein the even-order pre-distortion coefficient may include only second-order and fourth-order pre-distortion coefficients, and odd-order pre-predetermined
  • the distortion factor may include only third-order and fifth-order pre-distortion coefficients.
  • the predistorter of the present invention can be implemented in a microwave transmitter using a polynomial model containing both odd and even orders.
  • the predistorter coefficient update module is located in the receiver, and the coefficients generated by the module are C1, C2, C3, C4, .... where the coefficients C2, C3, C4, ... are fed back to the transmitter through the coefficient feedback channel In the distortor, the coefficient update is implemented.
  • the pre-distortion coefficient in the prior art only includes the odd-order pre-distortion coefficient.
  • the even-order pre-distortion coefficient is also used, so that the predistorter can be provided when the highest order of the pre-distortion coefficient is constant.
  • More adjustable coefficients increase the predistortion compensation capability of the new system.
  • predistorters using coefficients C2, C3, and C4 and predistorters using C3, C5, and C7 have substantially equivalent nonlinear compensation capabilities, but the former logic only needs to implement lx(n)l 3 , while the latter logic The need to implement lx(n) I 6 greatly reduces the difficulty of logic implementation.
  • the first-order coefficient is fed back to the input end of the estimating unit to implement residual linear distortion compensation of the input of the estimating unit, which greatly enhances the stability of the pre-distortion system, and the first-order coefficient
  • Other predistortion coefficients include not only odd-order pre-distortion coefficients, but also even-order pre-distortion coefficients, which can reduce the logic implementation difficulty of the predistorter and reduce system cost.
  • FIG. 3 is a schematic structural diagram of a microwave predistortion signal generating apparatus according to an embodiment of the present invention.
  • the microwave predistortion signal generating apparatus provided by the embodiment of the present invention includes: an analog to digital conversion unit 301, configured to perform analog to digital conversion to obtain a first received signal;
  • the channel compensation unit 302 is configured to perform channel compensation on the first received signal to obtain a second received signal.
  • the estimating unit 303 is configured to estimate a first transmit signal according to the second received signal, where the first transmit signal is a transmit signal before the digital-to-analog conversion of the microwave transmitter;
  • a pre-distortion coefficient calculation unit 304 configured to perform pre-distortion coefficient calculation according to the second received signal and the first transmit signal
  • a first-order coefficient compensation unit 305 configured to perform linear distortion compensation on the second received signal before estimating the first transmit signal by using the first-order coefficient calculated by the pre-distortion coefficient;
  • the pre-distortion coefficient sending unit 306 is configured to send the pre-distortion coefficients other than the first-order coefficients to the microwave transmitter, so that the microwave transmitter performs nonlinear pre-distortion on the transmitted signal by using other pre-distortion coefficients other than the first-order coefficients. .
  • the pre-distortion coefficient calculation unit 304 may be specifically configured to perform pre-distortion coefficient calculation according to the second received signal according to the second received signal and the first transmit signal, where the first formula is specifically:
  • C k (n+1) C k (n) + u k conj( X (n))
  • C k (n+1) is the n+1th time!
  • the order predistortion coefficient C k (n) is the nth kth predistortion coefficient
  • 3 ⁇ 4 is the step size of the coefficient update
  • x(n) is the first transmitted signal
  • y(n) is the second received signal
  • conj (x(n)) is the conjugate of the first transmitted signal
  • k is an integer greater than
  • n is an integer greater than zero.
  • the first formula of the first-order coefficient is specifically:
  • Ci(n+1) Ci(n) + Ui conj(x(n))( x(n)-y(n))
  • d(n+l) is the n+1th first order coefficient
  • d(n) is the nth first order predistortion coefficient
  • Ul is the step size of the coefficient update
  • x(n) is the first transmitted signal
  • y(n) is the second received signal
  • conj(x(n)) is The conjugate of the first transmitted signal, n being an integer greater than zero.
  • the pre-distortion coefficient calculation unit 304 may be specifically configured to perform calculation of first-order coefficients and even-order pre-distortion coefficients according to the second received signal and the first transmit signal, and may further be used to perform odd-order steps according to the second received signal and the first transmit signal. Calculation of the predistortion coefficient.
  • the pre-distortion coefficient calculation unit 304 may be specifically configured to perform first-order, second-order, and fourth-order pre-distortion coefficient calculations according to the second received signal and the first transmit signal, and may also be used to perform third-order and fifth-order pre-distortion coefficient calculation.
  • the microwave receiver receives the first received signal after the analog-to-digital conversion, performs channel compensation on the first received signal, obtains a second received signal, and estimates a first transmit signal according to the second received signal, where the A transmitting signal is a transmitting signal before digital-to-analog conversion of the microwave transmitter, and pre-distortion coefficient is calculated according to the second received signal and the first transmitted signal, and the first-order coefficient calculated by using the pre-distortion coefficient is used to estimate the first transmitted signal before
  • the second received signal is linearly compensated, and the predistortion coefficients other than the first order coefficients are sent to the microwave transmitter, so that the microwave transmitter performs nonlinear predistortion on the transmitted signal by using other predistortion coefficients than the first order coefficients.
  • the first received signal is an analog-to-digital converted signal, that is, the receiving of the first received signal does not require the microwave receiver to add an additional channel, and the receiving channel of the microwave receiver can be used, which can greatly reduce the cost, and the microwave receiver pre- Estimating the transmitted signal and calculating the pre-distortion coefficient only requires transmitting the pre-distortion coefficient to the microwave transmitter, and does not require the microwave transmitter to perform pre-distortion coefficient calculation, thereby improving the pre-distortion efficiency.
  • the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product.
  • the computer software product is stored in a storage medium and includes a plurality of instructions.
  • a computer device (which may be a personal computer, server, or network device, etc.) is caused to perform the methods described in various embodiments of the present invention.

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Abstract

本发明实施例公开了一种微波预失真信号生成方法和装置，微波接收机接收模数转换后的第一接收信号，对第一接收信号进行信道补偿，得到第二接收信号，根据第二接收信号估计出第一发射信号，所述第一发射信号是微波发射机数模转换前的发射信号，根据第二接收信号和第一发射信号进行预失真系数计算，利用预失真系数计算得到的一阶系数对估计出第一发射信号之前的第二接收信号进行线性失真补偿，将一阶系数之外的其它预失真系数发送到微波发射机，使得微波发射机对发射的信号进行非线性预失真。第一接收信号是模数转换后的信号，也就是说第一接收信号的接收不需要微波接收机增加额外通道，可以使用微波接收机的接收通道，可以降低成本。

Description

一种微波预失真信号生成方法和装置
技术领域
本发明涉及无线技术领域， 尤其涉及一种微波预失真信号生成方法和装 置。 背景技术
微波技术直接通过空间传送数据， 不需要铺设光纤或是电缆等， 在城市、 偏远地区或者特殊地区例如河流等具有明显的工程优势； 微波技术组网方便， 使用方式灵活， 业务开通时间短； 随着微波技术的发展， 微波设备的成本逐 渐降低， 因此， 微波技术的使用越来越广泛。
功率放大器（Power Ampl if ier, PA )是微波通讯系统的关键器件， 非线 性是功放的固有特点。 降低功放非线性对微波通讯系统影响的最筒单方法是 降低功放的输入功率， 即功放输入功率回退， 这种方法的代价是降低了微波 通讯系统室外单元（Outdoor Uni t , 0DU ) 的最大发射功率， 同时降低了功放 的功率效率。 另一种更有效的方法是预失真技术。 该方法在降低功放非线性 影响的同时，还可以提高微波系统 0DU的最大发射功率，提高功放的功放效率。
现有技术中的预失真技术采用将微波接收机接收的信号反馈到微波发射 机进行预失真计算， 需要增加一条从射频到基带完整的信号反馈装置， 实现 成本大。 发明内容
本发明实施例提供了一种微波预失真信号生成方法和装置， 可以降低微 波预失真的成本。
本发明实施例提供了一种微波预失真信号生成方法， 包括：
微波接收机接收模数转换后的第一接收信号；
微波接收机对第一接收信号进行信道补偿， 得到第二接收信号； 微波接收机根据第二接收信号估计出第一发射信号， 所述第一发射信号 是微波发射机数模转换前的发射信号；
微波接收机根据第二接收信号和第一发射信号进行预失真系数计算； 微波接收机利用预失真系数计算得到的一阶系数对估计出第一发射信号 之前的第二接收信号进行线性失真补偿；
微波接收机将一阶系数之外的其它预失真系数发送到微波发射机， 使得 微波发射机利用一阶系数之外的其它预失真系数对发射的信号进行非线性预 失真。
本发明实施例提供了一种微波预失真信号生成装置， 所述装置位于微波 接收机， 所述装置包括：
模数转换单元， 用于模数转换得到第一接收信号；
信道补偿单元， 用于对第一接收信号进行信道补偿， 得到第二接收信号; 估计单元， 用于根据第二接收信号估计出第一发射信号， 所述第一发射 信号是微波发射机数模转换前的发射信号；
预失真系数计算单元， 用于根据第二接收信号和第一发射信号进行预失 真系数计算；
一阶系数补偿单元， 用于利用预失真系数计算得到的一阶系数对估计出 第一发射信号之前的第二接收信号进行线性失真补偿；
预失真系数发送单元， 用于将一阶系数之外的其它预失真系数发送到微 波发射机， 使得微波发射机利用一阶系数之外的其它预失真系数对发射的信 号进行非线性预失真。
本发明实施例中， 微波接收机接收模数转换后的第一接收信号， 微波接 收机对第一接收信号进行信道补偿， 得到第二接收信号， 微波接收机根据第 二接收信号估计出第一发射信号， 所述第一发射信号是微波发射机数模转换 前的发射信号， 微波接收机根据第二接收信号和第一发射信号进行预失真系 数计算， 微波接收机利用预失真系数计算得到的一阶系数对估计出第一发射 信号之前的第二接收信号进行线性失真补偿， 微波接收机将一阶系数之外的 其它预失真系数发送到微波发射机， 使得微波发射机利用一阶系数之外的其 它预失真系数对发射的信号进行非线性预失真。 第一接收信号是模数转换后 的信号， 也就是说第一接收信号的接收不需要微波接收机增加额外通道， 可 以使用微波接收机的接收通道， 可以极大的降低成本， 微波接收机预估发射 信号并计算预失真系数， 仅需要将预失真系数发送到微波发射机， 不需要微 波发射机进行预失真系数计算， 提高预失真效率。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作筒单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明实施例提供的一种微波预失真信号生成方法的流程示意图； 图 2为本发明实施例提供的一种微波系统示意图；
图 3为本发明实施例提供的一种微波预失真信号生成装置的结构示意图。 具体实施方式
下面结合附图对本发明的具体实施方式进行说明。
图 1为本发明实施例提供的一种微波预失真信号生成方法的流程示意图。
5101 , 微波接收机接收模数转换后的第一接收信号；
5102, 微波接收机对第一接收信号进行信道补偿， 得到第二接收信号；
5103, 微波接收机根据第二接收信号估计出第一发射信号， 所述第一发 射信号是微波发射机数模转换前的发射信号；
5104, 微波接收机根据第二接收信号和第一发射信号进行预失真系数计 5105 , 微波接收机利用预失真系数计算得到的一阶系数对估计出第一发 射信号之前的第二接收信号进行线性失真补偿；
5106 , 微波接收机将一阶系数之外的其它预失真系数发送到微波发射机， 使得微波发射机利用一阶系数之外的其它预失真系数对发射的信号进行非线 性预失真。
本发明实施例中， 微波接收机接收模数转换后的第一接收信号， 对第一 接收信号进行信道补偿， 得到第二接收信号， 根据第二接收信号估计出第一 发射信号， 所述第一发射信号是微波发射机数模转换前的发射信号， 根据第 二接收信号和第一发射信号进行预失真系数计算， 利用预失真系数计算得到 的一阶系数对估计出第一发射信号之前的第二接收信号进行线性失真补偿， 将一阶系数之外的其它预失真系数发送到微波发射机， 使得微波发射机利用 一阶系数之外的其它预失真系数对发射的信号进行非线性预失真。 第一接收 信号是模数转换后的信号， 也就是说第一接收信号的接收不需要微波接收机 增加额外通道， 可以使用微波接收机的接收通道， 可以极大的降低成本， 微 波接收机预估发射信号并计算预失真系数， 仅需要将预失真系数发送到微波 发射机， 不需要微波发射机进行预失真系数计算， 提高预失真效率。
图 2为本发明实施例提供的一种微波系统示意图。 如图 2所示， 微波系 统包括微波发射机和微波接收机， 微波发射机发射微波信号， 微波接收机接 收微波信号。 通常情况下， 微波发射机同时具备微波接收功能， 微波接收机 同时具备微波发射功能， 本发明实施例为方便说明， 对微波发射机和微波接 收机进行区分， 微波接收机发送到微波发射机的微波信号的预失真方法和装 置是类似的。
微波发射机中的基带信号 Xl(n)首先经过预失真器形成预失真信号 Zl(n), 例如可以是数字基带预失真器， 该信号经过数模转换器转换到模拟域， 经过 上变频处理后到达功率放大器， 然后传输到微波接收机； 微波接收机接收来 自微波发射机的信号， 进行下变频处理， 然后经过模数转换器得到第一接收 信号， 信道补偿器对第一接收信号进行信道补偿， 得到第二接收信号 y(n), 信道补偿可以包括载波恢复、信道均衡和 I/Q不平衡校正等，估计单元根据第 二接收信号 y(n)估计出第一发射信号 x(n),所述第一发射信号是微波发射机数 模转换前的发射信号，x(n)和 Xl(n)是相同的信号， 只是延迟不同， 估计单元可 以使用硬判单元实现， 微波发射机发射的信号处于星座图的理想星座点， 微 波接收机接收的信号因为非线性等因素而偏离星座图的理想星座点， 硬判单 元根据区间判定所用的理想星座点， 从而估计出第一发射信号 x(n), 预失真 系数计算器根据第二接收信号 y(n)和第一发射信号 x(n)进行计算，得到预失真 系数，预失真系数的目标是使得第二接收信号 y(n)和第一发射信号 x(n)的差异 变小。
由于信道补偿器在补偿通道影响时， 会有少量的线性失真残留， 这些残 留的线性失真可能为相位失真等， 这些残留的线性失真会引起预失真系数漂 移。 发明人经过长期的理论和实验研究， 发现可以使用预失真系数中的一阶 系数对估计出第一发射信号之前的第二接收信号进行线性失真补偿， 本发明 实施例中， 将一阶系数反馈到估计单元的输入端， 实现估计单元输入的残留 线性失真补偿， 极大增强预失真系统的稳定性。
对于一阶系数之外的其它预失真系数， 通过系数反馈通道反馈到微波发 射机， 例如可以采用微波的开销通道实现， 微波接收机可以发送微波信号到 微波发射机， 微波发射机利用一阶系数之外的其它预失真系数对发射的信号 进行非线性预失真。
初始化时， 微波发射机预失真器不起作用， 即一阶系数之外的其它预失 真系数为零， 信号 Xl(n)未进行预失真直接到达功率放大器， 由于功率放大器 的非线性作用使得信号产生失真， 微波接收机的利用一阶系数校正线性失真， 并将一阶系数之外的其它预失真系数发送到微波发射机， 微波发射机的预失 真器利用这些系数进行预失真， 这些预失真后的信号到达功率放大器后， 可 以补偿功率放大器的非线性， 为了提高预失真的效果， 微波接收机可以接收 补偿功率放大器的非线性后的微波信号， 再次计算预失真系数并发送至微波 发射机， 微波发射机的预失真器利用这些系数进行预失真， 如此反复， 直至 第二接收信号 y(n)和第一发射信号 x(n)的差异低于某一个阈值或达到某种其 它要求， 功率放大器的非线性得到补偿。
预失真系数的计算和微波发射机的预失真的多项式模型相关， 本发明实 施例中， 微波发射机使用无记忆的多项式模型 （memoryless polynominal )进 行预失真， 该模型的公式为：
zi(n) = Xl(n)[ C!^+ C^Ix!^l+CsC^lx!C^ +^+Ck^lx!Cn)^ 1]
其中， Xl(n)为第 n次预失真前的信号， Zl(n)为第 n次预失真后的信号， Ck(n)为第 n次第 k阶预失真系数， k为大于 0的整数， n为大于 0的整数， 本 实施例同时使用奇数阶和偶数阶的预失真系数进行预失真。
本发明实施例中， 微波发射机没有收到来自微波接收机的一阶预失真系 数(^(11) ,微波发射机预失真的时候可以根据需求将 d(n)设置为一个常量，例 如可以直接设置为 1 , 一阶预失真系数 d(n)对非线性的预失真没有贡献。 微 波接收机使用计算得到的一阶预失真系数 d(n)对估计出第一发射信号之前的 第二接收信号进行线性失真补偿， 从而增强预失真系统的稳定性。
当然， 在其它实施例中， 可以使用其它多项式模型来对信号进行预失真， 例如可以采用沃特拉（ Volterra )级数多项式模型或者 Volterra级数多项式模型 的其它筒化模型进行预失真。
本发明实施例中， 预失真系数的计算公式为：
Ck(n+1) = Ck(n) + uk conj(X(n))|X(n)lk l ((x(n)-y(n))
其中， Ck(n+1)为第 n+1次第 k阶预失真系数， Ck(n)为第 n次第 k阶预失 真系数， uk为系数更新的步长， x(n)为第一发射信号， y(n)为第二接收信号， conj(x(n))为第一发射信号的共轭， k为大于 0的整数， n为大于 0的整数。 一 阶系数的初始值 d(0)可以为 l+0j ,—阶系数外其它预失真系数的初始值 Ck(0) 可以为 0。 当然， 也可以采用其它计算公式进行计算， 例如可以根据根据第二接收 信号和第一发射信号并利用第二公式进行预失真系数计算， 所述第二公式具 体为：
Ck(n+1) = Ck(n) + a conj(x(n))lx(n)lk— 1 ((x(n)-y(n))
其中， Ck(n+1)为第 n+1次第！^阶预失真系数， Ck(n)为第 n次第 k阶预失真系 数， α为系数更新的步长， χ(η)为第一发射信号， y(n)为第二接收信号， conj(x(n)) 为第一发射信号的共轭， k为大于 0的整数， n为大于 0的整数。
本实施例中， 一阶系数的计算公式具体为：
Ci(n+1) = Ci(n) + Ui conj(x(n))( x(n)-y(n))
其中， d(n+l)为第 n+1次第 1阶系数， d(n)为第 n次第 1阶预失真系数， Ul 为系数更新的步长， x(n)为第一发射信号， y(n)为第二接收信号， conj(x(n))为 第一发射信号的共轭， n为大于 0的整数。
本实施例计算的预失真系数可以为一阶系数和偶数阶预失真系数， 还可 以包括奇数阶预失真系数， 其中偶数阶预失真系数可以仅包括二阶和四阶预 失真系数， 奇数阶预失真系数可以仅包括三阶和五阶预失真系数。
本发明的预失真器可以采用同时包含奇偶阶的多项式模型， 位于微波发 射机中。 预失真器系数更新模块位于接收机中， 该模块生成的系数为 C1, C2, C3, C4, .... 其中系数 C2,C3,C4，...通过系数反馈通道反馈到发射机的预失真器 中， 实现系数更新。 现有技术中的预失真系数仅包括奇数阶预失真系数， 本 发明实施例还使用偶数阶预失真系数， 可以实现了在预失真系数最高阶数不 变的情况下， 使预失真器提供了更多的可调整的系数， 提高了新系统的预失 真补偿能力。 比如， 使用系数 C2,C3,C4的预失真器和使用 C3,C5,C7的预失真 器有基本相当的非线性补偿能力， 但前者逻辑只需要实现 lx(n)l3, 而后者的逻 辑需要实现 lx(n) I6较大程度上减低了逻辑实现难度。
本发明实施例中， 将一阶系数反馈到估计单元的输入端， 实现估计单元 输入的残留线性失真补偿， 极大增强预失真系统的稳定性， 一阶系数之外的 其它预失真系数不仅包括奇数阶预失真系数， 还包括偶数阶预失真系数， 可 以降低预失真器的逻辑实现难度， 减少系统成本。
图 3为本发明实施例提供的一种微波预失真信号生成装置的结构示意图。 如图 3所示， 本发明实施例提供的微波预失真信号生成装置包括： 模数转换单元 301 , 用于模数转换得到第一接收信号；
信道补偿单元 302, 用于对第一接收信号进行信道补偿，得到第二接收信 号；
估计单元 303 , 用于根据第二接收信号估计出第一发射信号， 所述第一发 射信号是微波发射机数模转换前的发射信号；
预失真系数计算单元 304 ,用于根据第二接收信号和第一发射信号进行预 失真系数计算；
一阶系数补偿单元 305 ,用于利用预失真系数计算得到的一阶系数对估计 出第一发射信号之前的第二接收信号进行线性失真补偿；
预失真系数发送单元 306 ,用于将一阶系数之外的其它预失真系数发送到 微波发射机， 使得微波发射机利用一阶系数之外的其它预失真系数对发射的 信号进行非线性预失真。
预失真系数计算单元 304可以具体用于根据根据第二接收信号和第一发 射信号并利用第一公式进行预失真系数计算， 所述第一公式具体为：
Ck(n+1) = Ck(n) + uk conj(X(n))|X(n)lk l ((x(n)-y(n))
其中， Ck(n+1)为第 n+1次第！^阶预失真系数， Ck(n)为第 n次第 k阶预失真系 数， ¾为系数更新的步长， x(n)为第一发射信号， y(n)为第二接收信号， conj(x(n)) 为第一发射信号的共轭， k为大于 0的整数， n为大于 0的整数。
所述一阶系数的第一公式具体为：
Ci(n+1) = Ci(n) + Ui conj(x(n))( x(n)-y(n))
其中， d(n+l)为第 n+1次第 1阶系数， d(n)为第 n次第 1阶预失真系数， Ul 为系数更新的步长， x(n)为第一发射信号， y(n)为第二接收信号， conj(x(n))为 第一发射信号的共轭， n为大于 0的整数。
预失真系数计算单元 304可以具体用于根据第二接收信号和第一发射信 号进行一阶系数和偶数阶预失真系数的计算， 可以还用于根据第二接收信号 和第一发射信号进行奇数阶预失真系数的计算。
预失真系数计算单元 304可以具体用于根据第二接收信号和第一发射信 号进行一阶、 二阶和四阶预失真系数计算， 还可以用于进行三阶和五阶预失 真系数计算。
本发明实施例中， 微波接收机接收模数转换后的第一接收信号， 对第一 接收信号进行信道补偿， 得到第二接收信号， 根据第二接收信号估计出第一 发射信号， 所述第一发射信号是微波发射机数模转换前的发射信号， 根据第 二接收信号和第一发射信号进行预失真系数计算， 利用预失真系数计算得到 的一阶系数对估计出第一发射信号之前的第二接收信号进行线性失真补偿， 将一阶系数之外的其它预失真系数发送到微波发射机， 使得微波发射机利用 一阶系数之外的其它预失真系数对发射的信号进行非线性预失真。 第一接收 信号是模数转换后的信号， 也就是说第一接收信号的接收不需要微波接收机 增加额外通道， 可以使用微波接收机的接收通道， 可以极大的降低成本， 微 波接收机预估发射信号并计算预失真系数， 仅需要将预失真系数发送到微波 发射机， 不需要微波发射机进行预失真系数计算， 提高预失真效率。
通过以上的实施方式的描述， 本领域的技术人员可以清楚地了解到本发 明实施例可借助软件加必需的通用硬件平台的方式来实现， 当然也可以通过 硬件实施。 基于这样的理解， 本发明实施例的技术方案本质上或者说对现有 技术做出贡献的部分可以以软件产品的形式体现出来， 该计算机软件产品存 储在一个存储介质中， 包括若干指令用以使得一台计算机设备（可以是个人 计算机， 服务器， 或者网络设备等）执行本发明各个实施例所述的方法。
以上揭露的仅为本发明的较佳实施例而已， 当然不能以此来限定本发明 之权利范围， 因此依本发明权利要求所作的等同变化， 仍属本发明所涵盖的 -ox -

Claims

权利 要求 书
1、 一种微波预失真信号生成方法， 其特征在于， 包括：
微波接收机接收模数转换后的第一接收信号；
微波接收机对第一接收信号进行信道补偿， 得到第二接收信号；
微波接收机根据第二接收信号估计出第一发射信号， 所述第一发射信号是 微波发射机数模转换前的发射信号；
微波接收机根据第二接收信号和第一发射信号进行预失真系数计算； 微波接收机利用预失真系数计算得到的一阶系数对估计出第一发射信号之 前的第二接收信号进行线性失真补偿；
微波接收机将一阶系数之外的其它预失真系数发送到微波发射机， 使得微 波发射机利用一阶系数之外的其它预失真系数对发射的信号进行非线性预失 真。
2、 根据权利要求 1所述的方法， 其特征在于， 所述微波接收机根据第二接 收信号和第一发射信号进行预失真系数计算具体包括：
微波接收机根据根据第二接收信号和第一发射信号并利用第一公式进行预 失真系数计算， 所述第一公式具体为：
Ck(n+1) = Ck(n) + uk conj(X(n))|X(n)lk l ((x(n)-y(n))
其中， Ck(n+1)为第 n+1次第 k阶预失真系数， Ck(n)为第 n次第 k阶预失真系数， ¾为系数更新的步长， x(n)为第一发射信号， y(n)为第二接收信号， conj(x(n))为 第一发射信号的共轭， k为大于 0的整数， n为大于 0的整数。
3、 根据权利要求 2所述的方法， 其特征在于， 一阶系数的计算公式具体为： Ci(n+1) = Ci(n) + Ui conj(x(n))( x(n)-y(n))
其中， d(n+l)为第 n+1次第 1阶系数， d(n)为第 n次第 1阶预失真系数， ^为 系数更新的步长， x(n)为第一发射信号， y(n)为第二接收信号， conj(x(n))为第一 发射信号的共轭， n为大于 0的整数。
4、根据权利要求 3所述的方法， 其特征在于， 一阶系数的初始值 d(0)为 l+0j。
5、 根据权利要求 2所述的方法， 其特征在于， 一阶系数外其它预失真系数的 初始值 Ck(0)为 0。
6、 根据权利要求 1所述的方法， 其特征在于， 微波接收机根据第二接收信 号和第一发射信号进行预失真系数计算包括：
微波接收机根据第二接收信号和第一发射信号进行一阶系数计算； 微波接 收机根据第二接收信号和第一发射信号进行偶数阶预失真系数计算。
7、 根据权利要求 6所述的方法， 其特征在于， 微波接收机根据第二接收信 号和第一发射信号进行预失真系数计算还包括：
微波接收机根据第二接收信号和第一发射信号进行奇数阶预失真系数计
8、 根据权利要求 6所述的方法， 其特征在于， 所述微波接收机根据第二接 收信号和第一发射信号进行偶数阶预失真系数计算具体为：
微波接收机根据第二接收信号和第一发射信号进行二阶和四阶预失真系数 计算。
9、 根据权利要求 7所述的方法， 其特征在于， 所述微波接收机根据第二接 收信号和第一发射信号进行奇数阶预失真系数计算具体为：
微波接收机根据第二接收信号和第一发射信号进行三阶和五阶预失真系数 计算。
10、 一种微波预失真信号生成装置， 其特征在于， 所述装置位于微波接收 机， 所述装置包括：
模数转换单元， 用于模数转换得到第一接收信号；
信道补偿单元， 用于对第一接收信号进行信道补偿， 得到第二接收信号； 估计单元， 用于根据第二接收信号估计出第一发射信号， 所述第一发射信 号是微波发射机数模转换前的发射信号；
预失真系数计算单元， 用于根据第二接收信号和第一发射信号进行预失真 系数计算； 一阶系数补偿单元， 用于利用预失真系数计算得到的一阶系数对估计出第 一发射信号之前的第二接收信号进行线性失真补偿；
预失真系数发送单元， 用于将一阶系数之外的其它预失真系数发送到微波 发射机， 使得微波发射机利用一阶系数之外的其它预失真系数对发射的信号进 行非线性预失真。
11、 根据权利要求 10所述的装置， 其特征在于， 所述预失真系数计算单元 具体用于根据根据第二接收信号和第一发射信号并利用第一公式进行预失真系 数计算， 所述第一公式具体为：
Ck(n+1) = Ck(n) + uk conj(X(n))|X(n)lk l ((x(n)-y(n))
其中， Ck(n+1)为第 n+1次第 k阶预失真系数， Ck(n)为第 n次第 k阶预失真系数， ¾为系数更新的步长， x(n)为第一发射信号， y(n)为第二接收信号， conj(x(n))为 第一发射信号的共轭， k为大于 0的整数， n为大于 0的整数。
12、 根据权利要求 11所述的装置， 其特征在于， 所述一阶系数的第一公式 具体为：
Ci(n+1) = Ci(n) + Ui conj(x(n))( x(n)-y(n))
其中， d(n+l)为第 n+1次第 1阶系数， d(n)为第 n次第 1阶预失真系数， ^为 系数更新的步长， x(n)为第一发射信号， y(n)为第二接收信号， conj(x(n))为第一 发射信号的共轭， n为大于 0的整数。
13、 根据权利要求 10所述的装置， 其特征在于， 所述预失真系数计算单元 具体用于根据第二接收信号和第一发射信号进行一阶系数和偶数阶预失真系数 的计算。
14、 根据权利要求 13所述的装置， 其特征在于， 所述预失真系数计算单元 还用于根据第二接收信号和第一发射信号进行奇数阶预失真系数的计算。
15、 根据权利要求 13所述的装置， 其特征在于， 所述预失真系数计算单元 具体用于根据第二接收信号和第一发射信号进行一阶、 二阶和四阶预失真系数 计算。
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