WO2011058843A1 - Amplificateur, circuit et procédé de compensation de distorsion - Google Patents

Amplificateur, circuit et procédé de compensation de distorsion Download PDF

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Publication number
WO2011058843A1
WO2011058843A1 PCT/JP2010/068011 JP2010068011W WO2011058843A1 WO 2011058843 A1 WO2011058843 A1 WO 2011058843A1 JP 2010068011 W JP2010068011 W JP 2010068011W WO 2011058843 A1 WO2011058843 A1 WO 2011058843A1
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Prior art keywords
signal
frequency
distortion
frequency range
suppression
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PCT/JP2010/068011
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English (en)
Japanese (ja)
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俊秀 桑原
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日本電気株式会社
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Publication of WO2011058843A1 publication Critical patent/WO2011058843A1/fr

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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
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion
    • 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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to an amplification device, a distortion compensation circuit, and a distortion compensation method, and more particularly to an amplification device, a distortion compensation circuit, and a distortion compensation method that suppress distortion components included in an output signal of an amplifier.
  • FIG. 1a to 1d are diagrams relating to a technique for suppressing a nonlinear distortion component caused by nonlinearity of input / output characteristics of an amplifier.
  • FIG. 1a is a diagram illustrating an example of an amplitude characteristic 801 of a transmission signal input to an amplifier.
  • FIG. 1B is a diagram illustrating an amplitude characteristic 811 of the output signal of the amplifier when the transmission signal illustrated in FIG. 1A is amplified by an amplifier having nonlinearity in input / output characteristics.
  • FIGS. 1a and 1b when a transmission signal having the amplitude characteristic 801 shown in FIG. 1a is input to an amplifier having nonlinearity in input / output characteristics, an output signal 811 of the amplifier is shown in FIG.
  • the nonlinear distortion component 821 shown in 1b is generated.
  • the amplifier that suppresses the nonlinear distortion component can cancel the nonlinear distortion component generated in the amplified transmission signal by adding a suppression component for suppressing the nonlinear distortion component to the transmission signal before amplification, for example. That is, the amplifier that suppresses the nonlinear distortion component suppresses the generation of a component having the same amplitude and a phase difference of 180 degrees (or an even multiple of 180 degrees) after amplification of the transmission signal.
  • the nonlinear distortion component generated in the transmission signal after amplification is removed.
  • FIG. 1c is a diagram illustrating an example of an amplitude characteristic 802 of a transmission signal in which a suppression component is added to the transmission signal 801 illustrated in FIG. 1a.
  • FIG. 1d is a diagram showing the amplitude characteristic 812 of the output signal of the amplifier when the transmission signal 801 shown in FIG. 1c is amplified.
  • FIG. 2 is a block diagram showing a configuration example of an amplifying apparatus 700 that suppresses nonlinear distortion components caused by nonlinear characteristics of the amplifier.
  • the amplifying apparatus 700 performs modulation and frequency conversion processing on the transmission signal supplied from the input terminal 701, and amplifies the transmission signal subjected to the processing.
  • the amplification device 700 includes an amplitude calculation unit 710, a suppression coefficient extraction unit 720, a multiplication unit 730, a modulation unit 740, a D / A (Digital to Analog) conversion unit 750, a multiplication unit 760, and an amplification unit 770.
  • the directional coupler 780 and the frequency oscillation unit 790 are provided.
  • the amplifying apparatus 700 includes a multiplication unit 810, an A / D (Analog to Digital) conversion unit 820, a demodulation unit 830, a feedback signal holding unit 840, a transmission signal holding unit 850, and a suppression coefficient calculation.
  • Unit 860 and a suppression coefficient holding unit 870 are examples of the signals from the amplifying apparatus 700.
  • the transmission signal is supplied from the input terminal 701 to the amplitude calculation unit 710, the multiplication unit 730, and the transmission signal holding unit 850 via the signal line 709.
  • the transmission signal is a baseband signal in which information to be transmitted is expressed by a complex number.
  • the amplitude calculation unit 710 is an absolute value calculator that calculates the amplitude of a transmission signal expressed by a complex number.
  • the amplitude calculation unit 710 calculates the absolute value of a complex number representing the transmission signal as the amplitude of the transmission signal.
  • amplitude calculation section 710 squares the numerical values of the real part and imaginary part of the complex number representing the transmission signal, and calculates the square root of these sums as the amplitude of the transmission signal.
  • the amplitude calculation unit 710 supplies the calculated amplitude to the suppression coefficient extraction unit 720.
  • the suppression coefficient extraction unit 720 extracts, from the suppression coefficient holding unit 870, a suppression coefficient for suppressing a nonlinear distortion component caused by the nonlinear characteristics of the amplifier 770. Since this suppression coefficient has a characteristic for canceling the nonlinearity of the input / output characteristic of the amplifier 770, it changes according to the amplitude of the transmission signal. For this reason, the suppression coefficient extraction unit 720 extracts the suppression coefficient from the suppression coefficient holding unit 870 based on the amplitude magnitude from the amplitude calculation unit 710.
  • the suppression coefficient extraction unit 720 extracts a suppression coefficient corresponding to the magnitude of the amplitude from the amplitude calculation unit 710 out of the suppression coefficients held in the suppression coefficient holding unit 870. In addition, the suppression coefficient extraction unit 720 supplies the extracted suppression coefficient to the multiplication unit 730.
  • Multiplier 730 multiplies the transmission signal from input terminal 701 by the suppression coefficient from suppression coefficient extraction unit 720, thereby transmitting a suppression component for canceling the nonlinear distortion component due to the nonlinear characteristics of amplifier 770.
  • Complex multiplication means for superimposing on a signal.
  • Multiplier 730 outputs the multiplication result to modulator 740 as a distortion-suppressed transmission signal via signal line 739.
  • This distortion suppression transmission signal is a so-called predistortion signal. Note that a distortion-suppressed transmission signal can be generally called a distortion-suppressed input signal.
  • the modulation unit 740 performs modulation processing on the distortion-suppressed transmission signal from the multiplication unit 730. For example, the modulation unit 740 superimposes the distortion-suppressed transmission signal on a carrier wave signal having an intermediate frequency (Intermediate Frequency). Also, the modulation unit 740 supplies the carrier wave signal on which the distortion-suppressed transmission signal is superimposed to the D / A conversion unit 750 as a modulation signal.
  • the modulation unit 740 supplies the carrier wave signal on which the distortion-suppressed transmission signal is superimposed to the D / A conversion unit 750 as a modulation signal.
  • the D / A converter 750 converts the modulation signal, which is a digital signal, into an analog signal.
  • the D / A conversion unit 750 supplies the modulation signal converted into the analog signal to the multiplication unit 760 via the signal line 759.
  • Multiplier 760 converts the frequency of the modulated signal from D / A converter 750 to a frequency higher than that frequency.
  • the multiplier 760 converts the frequency of the modulated signal into an RF (Radio Frequency) band, for example, by multiplying the modulated signal by the oscillation signal from the frequency oscillating unit 790.
  • the multiplication unit 760 outputs the frequency-converted modulated signal to the amplification unit 770 as an RF signal via the signal line 769.
  • the amplifying unit 770 is an amplifying unit that amplifies the power of the input signal that is the RF signal from the multiplying unit 760.
  • the amplifying unit 770 has nonlinearity in power input / output characteristics.
  • the amplification unit 770 outputs the amplified RF signal to the directional coupler 780 as an output signal via the signal line 779.
  • the directional coupler 780 is a coupler that outputs the output signal from the amplifying unit 770 to the signal line 789 and outputs part of the power of the output signal to the multiplier 810 as a feedback signal via the signal line 788. is there.
  • This feedback signal is a signal in which the power of the RF signal is attenuated.
  • Multiplication unit 810 an oscillation signal from the frequency oscillation unit 790, a feedback signal from the directional coupler 780, the multiplication of, for converting the frequency of the feedback signal to an intermediate frequency.
  • Multiplier 810 outputs the frequency-converted feedback signal to A / D converter 820 via signal line 819.
  • the A / D conversion unit 820 converts the feedback signal that is an analog signal from the multiplication unit 810 into a digital signal.
  • the A / D conversion unit 820 supplies the feedback signal converted into the digital signal to the demodulation unit 830.
  • the demodulation unit 830 performs a demodulation process corresponding to the modulation process of the modulation unit 740 on the feedback signal from the A / D conversion unit 820.
  • the demodulating unit 830 holds the demodulated feedback signal in the feedback signal holding unit 840 via the signal line 839.
  • the feedback signal holding unit 840 is a memory that holds the feedback signal from the demodulation unit 830.
  • the transmission signal holding unit 850 is a memory that holds a transmission signal supplied from the input terminal 701.
  • the feedback signal held in the feedback signal holding unit 840 is a signal obtained by amplifying the transmission signal held in the transmission signal holding unit 850 by the amplification unit 770.
  • the suppression coefficient calculation unit 860 calculates a suppression coefficient for multiplying the transmission signal from the input terminal 701.
  • the suppression coefficient calculation unit 860 refers to the feedback signal holding unit 840 and the transmission signal holding unit 850, and based on the transmission signal and the feedback signal corresponding to the transmission signal, the suppression coefficient according to the nonlinear characteristic of the amplification unit 770 to calculate the coefficient.
  • the suppression coefficient calculation unit 860 calculates the suppression coefficient so that, for example, the magnitude of the error signal that is the difference between the transmission signal and the feedback signal is minimized.
  • the control coefficient calculation unit 860 is realized by, for example, a central processing unit (DSP: Digital Signal Processor).
  • the suppression coefficient calculation unit 860 holds the calculated suppression coefficient in the suppression coefficient holding unit 870. In addition, every time the suppression coefficient is calculated, the suppression coefficient calculation unit 860 holds (overwrites) the suppression coefficient in the suppression coefficient holding unit 870 so as to overlap the area to be held.
  • the suppression coefficient holding unit 870 is a memory that holds the suppression coefficient calculated by the suppression coefficient calculation unit 860.
  • the suppression coefficient holding unit 870 is realized by, for example, a lookup table.
  • 3A to 3G are diagrams illustrating the amplitude characteristics of signals output to the signal lines in the amplification device 700.
  • FIG. 3 a shows the amplitude characteristic 702 of the transmission signal supplied from the input terminal 701 via the signal line 709.
  • the amplitude characteristic 702 indicates a waveform with a center frequency of the transmission signal of “0 Hz” and a frequency bandwidth BW. Since this transmission signal is represented by a complex number, it can take a negative frequency.
  • FIG. 3 b shows the amplitude characteristic 731 of the distortion-suppressed transmission signal output from the multiplier 730 via the signal line 739.
  • a suppression component 732 generated by multiplying the transmission signal by the suppression coefficient from the suppression coefficient extraction unit 720 is superimposed on the amplitude characteristic 731.
  • FIG. 3 c shows an amplitude characteristic 751 of the modulation signal output from the D / A conversion unit 750 via the signal line 759.
  • the center frequency of the amplitude characteristic 751 is subjected to modulation processing by the modulation unit 740, and thus indicates an intermediate frequency f_if.
  • FIG. 3d shows the amplitude characteristic 761 of the RF signal output from the multiplier 760 via the signal line 769. Since the center frequency of the amplitude characteristic 761 is frequency-converted by the multiplier 760, it indicates the RF frequency f_rf.
  • FIG. 3 e shows an amplitude characteristic 771 of the RF signal output from the amplifying unit 770 via the signal line 779.
  • the amplitude characteristic 771 shows the amplitude characteristic from which the nonlinear distortion component is removed because the suppression component 762 shown in FIG. 3d cancels the nonlinear distortion component caused by the nonlinear characteristic of the amplification unit 770.
  • FIG. 3 f shows the amplitude characteristic 811 of the feedback signal output from the multiplier 810 via the signal line 819. Since the center frequency of the amplitude characteristic 881 is frequency-converted by the multiplier 760, it indicates the intermediate frequency f_if.
  • FIG. 3g shows the amplitude characteristic 831 of the feedback signal output from the demodulator 830 via the signal line 839.
  • the center frequency of the amplitude characteristic 831 indicates “0 Hz” because the demodulation processing is performed by the demodulation unit 830.
  • This feedback signal is a baseband signal.
  • the amplifying apparatus 700 suppresses the nonlinear distortion component caused by the nonlinear characteristic of the amplifying unit 770 by multiplying the transmission signal by the suppression coefficient from the suppression coefficient extracting unit 720 in the multiplying unit 730.
  • the frequency characteristic of the nonlinear distortion component changes depending on the frequency characteristic of the amplifying unit. For this reason, there is a problem in that a part of the distortion component remains in the output signal of the amplification unit only by adding the suppression component to the transmission signal.
  • the change in the frequency characteristic of the nonlinear distortion component becomes significant, and the output signal of the amplifying unit remaining distortion component is increased.
  • FIG. 4a to 4d are diagrams relating to frequency fluctuations of nonlinear distortion components caused by the frequency characteristics of the amplification unit.
  • the transmission signal having the amplitude characteristic 801 shown in FIG. 4a is input to an amplification unit having nonlinearity in input / output characteristics and having frequency characteristics
  • the output signal of the amplification unit is shown in FIG. 4b.
  • the distortion component 832 shown is generated due to the influence of the frequency characteristic of the amplification unit.
  • the nonlinear distortion component 832 exhibits an asymmetric amplitude characteristic due to the frequency characteristic of the amplifying unit is referred to as a memory effect here.
  • Patent Document 1 A technique for solving such a problem is described in Patent Document 1.
  • Distortion compensating apparatus the complex digital filter, by correcting the amplitude characteristic in the analog circuit unit including a power amplifier, suppressing the distortion component included in the output signal of the power amplifier.
  • the adaptive equalizer selects a filter coefficient to be set in the complex digital filter from among a plurality of filter coefficients based on a feedback signal from the power amplifier. Therefore, there is a problem that the circuit scale increases.
  • An object of the present invention is to provide an amplifier, a distortion compensation circuit, and a distortion compensation method that solve the above-described problems.
  • the distortion compensation circuit of the present invention includes an input terminal that receives an input signal for generating an amplification target signal supplied to an amplification unit that amplifies power, and the amplification caused by nonlinearity of input / output characteristics of the amplification unit Multiplication means for generating a distortion suppression input signal by multiplying the input signal by a suppression coefficient for suppressing a distortion component of the output signal of the means, and a frequency component of a difference signal between the input signal and the distortion suppression input signal extracting means for extracting a frequency component as an extraction signal for each of said frequency ranges corresponding to each of a plurality of frequency ranges of, for correcting the change in the frequency characteristic of the distortion components due to the frequency characteristic possessed by the amplifying means
  • Correction coefficient holding means for holding the correction coefficient for each frequency range, and multiplying the extracted signal by the correction coefficient for each frequency range.
  • a correction signal generating means for generating a correction signal for each of the frequency ranges Te, on the basis of the correction signal and the distortion suppression input signal for each frequency
  • An amplifying apparatus is an amplifying apparatus that amplifies an input signal by having an amplifying unit having nonlinearity in power input / output characteristics and having frequency characteristics, and is caused by the nonlinearity of the amplifying means.
  • Multiplying means for generating a distortion suppression input signal by multiplying the input signal with a suppression coefficient for suppressing a distortion component of the output signal of the amplification means, the input signal and the distortion suppression input signal
  • Extraction means for extracting a frequency component corresponding to each of a plurality of frequency ranges among the frequency components of the difference signal as an extraction signal for each frequency range, and frequency characteristics of the distortion component due to the frequency characteristics of the amplification means
  • Correction coefficient holding means for holding a correction coefficient for correcting a change in each frequency range, and multiplying the extracted signal by the correction coefficient for each frequency range.
  • a correction signal generating means for generating a correction signal for each of the frequency range by a correction signal for each of the frequency ranges, and the distortion suppression input signal, based on the amplified signal generating means for generating an amplified signal,
  • the amplification means amplifies the amplification target signal.
  • the distortion compensation method of the present invention includes: an input terminal that receives an input signal for generating an amplification target signal supplied to an amplification unit that amplifies power; and the amplification caused by nonlinearity of input / output characteristics of the amplification unit A plurality of suppression coefficient holding means for holding a suppression coefficient for suppressing a distortion component of the output signal of the means, and a plurality of correction coefficients for correcting a change in the frequency characteristic of the distortion component caused by the frequency characteristic of the amplification means.
  • the amplitude characteristic of the distortion suppression transmission signal output from the multiplication part 730 is shown.
  • the amplitude characteristic of the modulation signal output from the D / A conversion unit 750 is shown.
  • the amplitude characteristic of the RF signal output from the multiplier 760 is shown.
  • the amplitude characteristic of the RF signal output from the amplification unit 770 is shown.
  • the amplitude characteristic of the feedback signal output from the multiplier 810 is shown.
  • the amplitude characteristic of the feedback signal output from the demodulator 830 is shown. It is a figure which shows the amplitude characteristic of the transmission signal input into the amplifier which has nonlinearity in an input-output characteristic, and has a frequency characteristic.
  • FIG. 4B is a diagram illustrating amplitude characteristics of an output signal of an amplifier when the transmission signal illustrated in FIG. 4A is amplified. It is a figure which shows the amplitude characteristic of the transmission signal with which the suppression component was superimposed. It is a figure which shows the example in which a part of nonlinear distortion component of the output signal of an amplifier remains. It is a block diagram which shows the amplification apparatus in embodiment of this invention. 3 is a block diagram illustrating an example of a configuration of a frequency characteristic correction unit 300.
  • FIG. It is a figure which shows an example of the amplitude characteristic of the low-pass filter 351. It is a figure which shows an example of the amplitude characteristic of the low-pass filter 352.
  • FIG. 6 is a diagram illustrating amplitude characteristics of a transmission signal input to a frequency characteristic correction unit 300.
  • FIG. 6 is a diagram illustrating amplitude characteristics of a distortion-suppressed transmission signal input to a frequency characteristic correction unit 300.
  • FIG. The amplitude characteristic of the output signal in which the low frequency side of the nonlinear distortion component is low and the high frequency side is high is shown.
  • the amplitude characteristic of the output signal in which the low frequency side of the nonlinear distortion component is high and the high frequency side is low is shown.
  • the amplitude characteristic of the output signal in which the low frequency side and the high frequency side of the nonlinear distortion component are increased is shown.
  • the amplitude characteristic of the output signal in which the low frequency side and the high frequency side of the nonlinear distortion component are low is shown.
  • 5 is a flowchart illustrating an example of a processing procedure of a distortion compensation method in the amplification device 100.
  • FIG. 5 is a block diagram illustrating an amplifying apparatus according to an embodiment of the present invention.
  • the amplifying apparatus 100 performs modulation and frequency conversion processing on the transmission signal from the input terminal 101, and amplifies the transmission signal subjected to the processing.
  • the transmission signal from the input terminal 101 is a baseband signal in which information to be transmitted is expressed by a complex number.
  • a transmission signal can generally be referred to as an input signal.
  • the amplification device 100 includes a modulation unit 110, a D / A conversion unit 120, a multiplication unit 130, an amplification unit 140, a directional coupler 150, a frequency oscillation unit 160, a multiplication unit 170, and an A / D conversion.
  • Unit 180, demodulator 190, and distortion compensation circuit 200 includes an amplitude calculation unit 210, a suppression coefficient extraction unit 220, a multiplication unit 230, a feedback signal holding unit 240, a transmission signal holding unit 250, a suppression coefficient calculation unit 260, and a suppression coefficient holding. It includes a section 270, a.
  • the distortion compensation circuit 200 includes a frequency characteristic correction unit 300, a correction coefficient setting unit 310, and a correction coefficient holding unit 320.
  • the modulation unit 110, the D / A conversion unit 120, the multiplication unit 130, the amplification unit 140, and the directional coupler 150 are the modulation unit 740, the D / A conversion unit 750, the multiplication unit 760, the amplification unit 770, and the direction, respectively. a sexual coupler 780 of the same configuration.
  • Amplifying section 140 can generally be referred to as an amplifying means.
  • the frequency oscillation unit 160, the multiplication unit 170, the A / D conversion unit 180, and the demodulation unit 190 have the same configuration as the frequency oscillation unit 790, the multiplication unit 810, the A / D conversion unit 820, and the demodulation unit 830, respectively.
  • the amplitude calculation unit 210, the suppression coefficient extraction unit 220, and the multiplication unit 230 have the same configuration as the amplitude calculation unit 710, the suppression coefficient extraction unit 720, and the multiplication unit 730, respectively.
  • Multiplier 230 can be generally referred to as multiplication means.
  • the feedback signal holding unit 240, the transmission signal holding unit 250, the suppression coefficient calculation unit 260, and the suppression coefficient holding unit 270 are respectively a feedback signal holding unit 840, a transmission signal holding unit 850, a suppression coefficient calculation unit 860, and a suppression coefficient holding. part 870 is the same as the configuration.
  • the frequency characteristic correcting portion 300 for other configurations other than the correction coefficient setting unit 310 and the correction coefficient holding unit 320, because it is similar to the configuration shown in FIG. 2, the description herein.
  • the correction coefficient setting unit 310 causes the correction coefficient holding unit 320 to hold a correction coefficient for correcting the frequency characteristics of the distortion-suppressed transmission signal from the multiplication unit 230.
  • the correction coefficient setting unit 310 receives an operation related to the setting of the correction coefficient by the user of the amplification device 100. At this time, the user of the amplifying apparatus 100 sequentially changes the value of the correction coefficient, measures the spectrum of the output signal of the amplifying unit 140, and determines the value that minimizes the distortion component of the output signal as the correction coefficient setting unit 310. It performs an operation to input to. The correction coefficient setting unit 310 sets the correction coefficient value in the correction coefficient holding unit 320 based on the accepted operation.
  • the correction coefficient holding unit 320 is a memory that holds the correction coefficient set by the correction coefficient setting unit 310. That is, the correction coefficient holding unit 320 holds a correction coefficient for correcting a change in the frequency characteristic of the nonlinear distortion component caused by the frequency characteristic of the amplification unit 140. This correction coefficient is expressed by a complex number. Further, the correction coefficient holding unit 320 outputs the correction coefficient to the frequency characteristic correction unit 300 via the signal line 329.
  • the correction coefficient holding unit 320 can be generally called correction coefficient holding means.
  • the frequency characteristic correction unit 300 corrects the frequency characteristic of the distortion-suppressed transmission signal in order to reduce the fluctuation of the frequency characteristic of the nonlinear distortion component caused by the frequency characteristic of the amplification unit 140. That is, the frequency characteristic correction unit 300 is a memory effect cancellation circuit that adds a specific frequency characteristic to the distortion-suppressed transmission signal in order to cancel out the fluctuation of the frequency characteristic of the nonlinear distortion component caused by the memory effect of the amplification unit 140.
  • the frequency characteristic correction unit 300 corrects the frequency characteristic of the distortion-suppressed transmission signal based on the transmission signal from the input terminal 101 and the correction coefficient held in the correction coefficient holding unit 320. Further, the frequency characteristic correction unit 300 outputs the corrected distortion-suppressed transmission signal to the modulation unit 110 via the signal line 309.
  • the amplifying apparatus 100 may be configured by only the amplifying unit 140, the multiplying unit 230, the frequency characteristic correcting unit 300, and the correction coefficient holding unit 320. Further, the distortion compensation circuit 200 may be configured by only the multiplication unit 230, the frequency characteristic correction unit 300, and the correction coefficient holding unit 320.
  • FIG. 6 is a block diagram illustrating a configuration example of the frequency characteristic correction unit 300.
  • the frequency characteristic correction unit 300 includes an extraction unit 350, a multiplication unit 360, and an addition unit 370.
  • the extraction unit 350 includes an adder 340, a low-pass filter 351, and a high-pass filter 352.
  • Multiplier 360 includes multipliers 361 and 362.
  • the low-frequency and high-frequency correction coefficients are held in the correction coefficient holding unit 320, respectively, and the low-frequency is supplied to the multipliers 361 and 362 via the signal lines 327 and 328 included in the signal line 329, respectively.
  • a high-frequency correction factor is assumed to be supplied.
  • Extraction unit 350 a transmission signal from the signal line 109, among the frequency components of the distortion suppression transmission signals and, of the differential signal from the signal line 239, a frequency component corresponding to each of a plurality of frequency ranges for each frequency range each extraction.
  • Extracting unit 350 among the frequency components of the difference signal between the transmission signal and the distortion suppression transmission signal, and extracts each signal consisting of frequency components of negative frequency range, a signal composed of the frequency components of the positive frequency range, the . That is, the extraction unit 350 corresponds to a frequency range lower than the middle of the entire frequency range of the difference signal and other frequency ranges among the frequency components of the difference signal between the transmission signal and the distortion suppression transmission signal. extracting a frequency component for each frequency range.
  • the extraction unit 350 supplies the extracted signal to the multiplication unit 360 as an extraction signal.
  • Extraction unit 350 can generally be referred to as extraction means.
  • the adder 340 extracts a suppression component included in the distortion suppression transmission signal by calculating a difference between the transmission signal from the signal line 109 and the distortion suppression transmission signal from the signal line 239.
  • the suppression component referred to here is a component for canceling the nonlinear distortion component caused by the nonlinear characteristic of the amplification unit 140, and is a component generated by multiplication of the transmission signal and the suppression coefficient in the multiplication unit 230.
  • the adder 340 outputs the calculation result as a difference signal to the low-pass filter 351 and the high-pass filter 352.
  • the low-pass filter 351 and the high-pass filter 352 are filters for dividing a suppression component that is a differential signal into a low-frequency range and a high-frequency range.
  • the low-pass filter 351 and the high-pass filter 352 are realized by a digital filter such as a FIR (Finite Impulse Response) filter, for example.
  • FIR Finite Impulse Response
  • the low-pass filter 351 is a filter that extracts a low-frequency component that is lower than the center frequency of the difference signal from the frequency components of the difference signal from the adder 340. That is, the low-pass filter 351 extracts a low-frequency component from the suppression components. Further, the low-pass filter 351 outputs the extracted low-frequency component to the multiplier 361 as a low-frequency extraction signal.
  • the high-pass filter 352 is a filter that extracts a high-frequency component higher than the center frequency of the difference signal from the frequency components of the difference signal from the adder 340. That is, the high-pass filter 352 extracts a high-frequency component from the suppression components. The high-pass filter 352 outputs the extracted high-frequency component to the multiplier 362 as a high-frequency extraction signal.
  • the multiplication unit 360 is a complex multiplier that multiplies the extracted signal for each frequency range by a correction coefficient corresponding to the frequency range in order to give a specific frequency characteristic to the suppression component included in the distortion suppression transmission signal. That is, the multiplication unit 360, by multiplying each frequency range extraction signal from the extraction unit 350 the correction coefficients held in correction coefficient holding unit 320, it generates a correction signal for each frequency range. The multiplication unit 360 supplies the generated correction signals to the addition unit 370. Multiplier 360 can generally be referred to as a correction signal generating means.
  • the multiplier 361 emphasizes or suppresses the low frequency component of the suppression component in the distortion suppression transmission signal according to the low frequency correction coefficient from the signal line 327.
  • the multiplier 361 generates a low-frequency correction signal by multiplying the low-frequency correction coefficient from the signal line 327 by the low-frequency extraction signal from the low-pass filter 351.
  • the multiplier 361 supplies the low-frequency correction signal to the adding unit 370.
  • Multiplier 362 emphasizes or suppresses the high frequency component of the suppression component in the distortion suppression transmission signal in accordance with the high frequency correction coefficient from signal line 328.
  • the multiplier 362 multiplies the high-frequency extracted signal from the high-pass filter 352 by the high-frequency correction coefficient from the signal line 328 to generate a high-frequency correction signal.
  • the multiplier 362 supplies the high-frequency correction signal to the adder 370.
  • the addition unit 370 gives a specific frequency characteristic to the suppression component by adding the correction signal in each frequency range to the distortion suppression transmission signal.
  • Adder 370 generates a new distortion-suppressed transmission signal based on the correction signal corresponding to each of the plurality of frequency ranges and the distortion-suppressed transmission signal from signal line 239. Note that a new distortion-suppressed transmission signal can be generally called an amplification target signal.
  • the adding unit 370 adds the low-frequency correction signal from the multiplier 361, the high-frequency correction signal from the multiplier 362, and the distortion suppression transmission signal from the signal line 239. generates a new distortion suppression transmission signals. That is, the adding unit 370 adds a correction signal corresponding to each of the low frequency range and the other frequency range and a distortion suppression transmission signal obtained by multiplying the transmission signal by a suppression coefficient, thereby generating a new distortion suppression transmission. to generate a signal. In addition, the adding unit 370 supplies the new distortion-suppressed transmission signal to the modulation unit 110 via the signal line 309. Adder 370 can be generally referred to as amplification target signal generation means.
  • the adding unit 370 generates a new distortion suppression transmission signal based on the correction signal for each frequency range and the distortion suppression transmission signal from the signal line 239.
  • the unit 370 may generate a new distortion-suppressed transmission signal based on the correction signal for each frequency range and the transmission signal from the signal line 109.
  • the frequency characteristic correction unit 300 corrects the frequency characteristic of the distortion suppression transmission signal based on the suppression component included in the distortion suppression transmission signal from the multiplication unit 230.
  • the correction unit 300 may correct the frequency characteristics of the distortion-suppressed transmission signal using the low-frequency component and the high-frequency component of the distortion-suppressed transmission signal from the multiplication unit 230.
  • FIG. 7a and 7b are diagrams showing examples of amplitude characteristics of the low-pass filter 351 and the low-pass filter 352.
  • Fs indicates the sampling frequency of the transmission signal.
  • FIG. 7 a is a diagram showing the amplitude characteristics of the low-pass filter 351.
  • This amplitude characteristic has a large amplitude gain in the low frequency range from the vicinity of the center frequency “0 Hz” of the differential signal to the vicinity of “ ⁇ fs / 2”.
  • the differential signal after passing through the low-pass filter 351 is a signal composed of frequency components in the low-frequency range among the frequency components of the differential signal.
  • this amplitude characteristic has a relatively low amplitude gain in the vicinity of “0 Hz”. This is because the non-linear distortion component has a small amplitude fluctuation in the vicinity of the center frequency.
  • FIG. 7 b is a diagram showing the amplitude characteristics of the high-pass filter 352.
  • This amplitude characteristic has a large amplitude gain in the high frequency range from the vicinity of the center frequency “0 Hz” of the difference signal to the vicinity of “fs / 2”.
  • the differential signal after passing through the high-pass filter 352 is a signal composed of frequency components in the high-frequency range among the frequency components of the differential signal.
  • this amplitude characteristic has a relatively low amplitude gain in the vicinity of “0 Hz”. This is because the amplitude fluctuation is small in the vicinity of the center frequency of the nonlinear distortion component.
  • the frequency characteristic of the nonlinear distortion component can be appropriately corrected.
  • FIG. 8a and 8b are diagrams illustrating an example of amplitude characteristics of a transmission signal and a distortion-suppressed transmission signal supplied to the frequency characteristic correction unit 300.
  • FIG. 8 a shows the amplitude characteristic 102 of the transmission signal supplied from the input terminal 101 via the signal line 109.
  • the amplitude characteristic 102 of the transmission signal indicates a waveform having a center frequency of “0 Hz” and a frequency bandwidth BW.
  • FIG. 8 b shows the amplitude characteristic 131 of the distortion-suppressed transmission signal output from the multiplier 230 via the signal line 239.
  • the amplitude characteristic 131 includes a suppression component 132 generated by multiplying the transmission signal by the suppression coefficient from the suppression coefficient extraction unit 220.
  • FIGS. 8a and 8b show examples of amplitude characteristics of the output signal of the frequency characteristic correction unit 300 when the transmission signal 102 and the distortion suppression transmission signal 131 shown in FIGS. 8a and 8b are supplied to the frequency characteristic correction unit 300.
  • FIG. FIG. In this example, a representative example of four cases among combinations of a low-frequency correction coefficient and a high-frequency correction coefficient will be briefly described.
  • FIG. 9 a shows the amplitude characteristic 301 of the output signal when the low frequency side of the nonlinear distortion component is low and the high frequency side is high due to the frequency characteristic of the amplification unit 140.
  • the suppression component 371 in the amplitude characteristic 301 is suppressed on the low frequency side and emphasized on the high frequency side compared to the suppression component 132 generated by the multiplication unit 230.
  • the correction coefficient holding unit 320 holds a negative low-frequency correction coefficient and a positive high-frequency correction coefficient.
  • FIG. 9 b shows the amplitude characteristic 302 of the output signal when the low frequency side of the nonlinear distortion component is high and the high frequency side is low due to the frequency characteristic of the amplification unit 140.
  • the suppression component 372 in the amplitude characteristic 302 is emphasized on the low frequency side and suppressed on the high frequency side compared to the suppression component 132.
  • the correction coefficient holding unit 320 holds a positive low-frequency correction coefficient and a negative high-frequency correction coefficient.
  • FIG. 9c shows the amplitude characteristic 303 of the output signal when the low frequency side and the high frequency side of the nonlinear distortion component are increased by the frequency characteristic of the amplification unit 140.
  • the suppression component 373 in the amplitude characteristic 303 is emphasized on the low frequency side and the high frequency side compared to the suppression component 132 generated by the multiplication unit 230.
  • the correction coefficient holding unit 320 holds a positive low-frequency correction coefficient and a positive high-frequency correction coefficient.
  • FIG. 9d shows the amplitude characteristic 304 of the output signal when the low frequency side and the high frequency side of the nonlinear distortion component are lowered by the frequency characteristic of the amplification unit 140.
  • the suppression component 374 in the amplitude characteristic 304 is suppressed on the low frequency side and the high frequency side compared to the suppression component 132.
  • the correction coefficient holding unit 320 holds a negative low-frequency correction coefficient and a negative high-frequency correction coefficient.
  • the correction coefficient setting unit 310 in accordance with the frequency characteristic of the amplification section 140, by setting the low-range correction coefficient and high correction coefficients respectively, amplifier 100 controls the frequency characteristic of inhibiting component 132 can do.
  • FIG. 10 is a flowchart illustrating an example of a processing procedure of a distortion compensation method in the amplification device 100.
  • the suppression coefficient extracting unit 220 based on the magnitude of the amplitude of the transmission signal from the amplitude calculating unit 210, extracts the suppression coefficient held in the suppression coefficient holding unit 270 (step S901).
  • multiplier 230 a transmission signal from the input terminal 101, a suppression coefficient extracted by suppression factor extraction unit 220, on the basis, to generate a distortion suppression transmission signal (step S902).
  • the adder 340 generates a differential signal composed of suppression components by subtracting the transmission signal from the distortion suppression transmission signal that is the output of the multiplication unit 230 (step S903).
  • the low-pass filter 351 extracts a low-frequency component in the difference signal from the adder 340 and outputs the extracted signal as a low-frequency extraction signal.
  • the high-pass filter 352 extracts a high-frequency component from the difference signal from the adder 340 and outputs the extracted signal as a high-frequency extraction signal (step S904).
  • the multiplier 361 based on the extracted signal of low frequency from the low-pass filter, and the correction coefficient of low frequency held in the correction coefficient storing unit 320, generates a correction signal of low frequency.
  • the multiplier 362 generates a high-frequency correction signal based on the high-frequency extracted signal from the high-pass filter and the high-frequency correction coefficient held in the correction coefficient holding unit 320 (step). S905).
  • Adder 370 then generates a new distortion-suppressed transmission signal by adding the low-frequency and high-frequency correction signals from multipliers 361 and 362 to the distortion-suppressed transmission signal (step S906). processing procedure of compensation method ends.
  • the frequency characteristic correcting unit 300 can correct the frequency characteristic of inhibiting component in the distortion suppressing transmission signal based on the correction coefficient set by the correction coefficient setting unit 310.
  • the distortion compensation circuit 200 can reduce the nonlinear distortion component included in the output signal of the amplification unit 140. That is, the frequency characteristic correction unit 300 can suppress distortion components due to the memory effect of the amplification unit 140.
  • the extraction unit 350 extracts, for each frequency range, frequency components corresponding to each of a plurality of frequency ranges from among the frequency components of the difference signal between the transmission signal and the distortion-suppressed transmission signal. Then, the multiplication unit 360 generates a correction signal for each frequency range based on the correction coefficient from the correction coefficient holding unit 320 and the extraction signal from the extraction unit 350 for each frequency range. Thereby, the frequency characteristic of the suppression component in a distortion suppression transmission signal can be controlled for every frequency range.
  • the frequency characteristic correction unit 300 uses the low-pass filter 351, the high-pass filter 352, and the multipliers 361 and 362 to independently reduce the low-frequency and high-frequency characteristics in the suppression component. Control. Thus alone control only two bands, since the frequency variation of the nonlinear distortion component caused by the memory effect is not steep, it is possible to remove residual components at the output of the amplifier 140 adequately. Thereby, the distortion compensation circuit 200 can correct the frequency characteristic of the suppression component with the minimum number of filters, and thus the circuit scale of the distortion compensation circuit 200 can be suppressed.
  • the user of the amplifying apparatus 100 can control the frequency characteristics of the suppression component included in the distortion-suppressed transmission signal only by adjusting the two correction coefficients. Therefore, by providing a digital filter instead of the frequency characteristic correcting unit 300, as compared with the case of setting the number of filter coefficients directly, the user can conveniently control the frequency characteristic of inhibiting component.
  • the distortion compensation circuit 200 controls the frequency characteristic of the suppression component with high accuracy by reducing the setting step width of the correction coefficient as compared with the case where a predetermined frequency characteristic is selected and set in the digital filter. be able to.
  • the frequency characteristic correcting unit 300 can generate a correction signal based on the suppression component by causing the adder 340 to generate a differential signal between the transmission signal and the distortion suppression transmission signal.
  • the frequency characteristic correction unit 300 can appropriately suppress the frequency fluctuation of the nonlinear distortion component in which the degree of influence of the frequency characteristic of the amplification unit 140 changes according to the magnitude of the nonlinear distortion component. That is, the frequency characteristic correcting unit 300 can more appropriately reduce the distortion component included in the output signal of the amplifying unit 140 as compared with the case where the frequency characteristic is corrected based on the distortion suppression transmission signal from the multiplying unit 230. it can.
  • the amplitude characteristic near the center frequency of the difference signal in the low-pass filter 351 and the high-pass filter 352. Is kept low. For this reason, it is possible to increase the correction amount of the amplitude of the frequency band in the middle of the frequency range of the low-pass filter 351 or the high-pass filter 352 as compared with the vicinity of the center frequency of the suppression component with small frequency fluctuation. Thereby, even if it is the structure of only two filters, the distortion component resulting from the frequency characteristic which the amplifier 140 has can be suppressed appropriately.
  • the amplifying apparatus 100 sets the correction coefficient in the correction coefficient holding unit 320 based on the operation of the user.
  • the amplifying apparatus 100 is based on the transmission signal and the feedback signal.
  • a correction coefficient may be generated.
  • the illustrated configuration is merely an example, and the present invention is not limited to the configuration.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Amplifiers (AREA)

Abstract

L'invention concerne un circuit de compensation de distorsion destiné à réduire une composante de distorsion d'un signal de sortie provenant d'un amplificateur et à réduire l'échelle de circuit. Ce circuit de compensation de distorsion comprend : une unité de multiplication destinée à calculer un signal d'entrée de suppression de distorsion en fonction d'un signal d'entrée et d'un coefficient de suppression afin de supprimer la composante de distorsion émanant des caractéristiques non linéaires de l'amplificateur ; une unité d'extraction destinée à extraire, comme signal d'extraction pour chaque plage de fréquences, une composante de fréquence correspondant à chaque plage d'une pluralité de plages de fréquences parmi les composantes de fréquence d'un signal différentiel du signal d'entrée et du signal d'entrée de suppression de distorsion ; un support de coefficient de compensation destiné à maintenir, pour chaque plage de fréquences, un coefficient de compensation afin de corriger un changement des caractéristiques de fréquence de la composante de distorsion émanant des caractéristiques de fréquence de l'amplificateur ; une unité de multiplication destinée à multiplier, pour chaque plage de fréquences, le coefficient de compensation par le signal d'extraction pour générer un signal de compensation ; ainsi qu'une unité d'addition destinée à générer un signal à amplifier en fonction du signal d'entrée et du signal de compensation de chaque plage de fréquences.
PCT/JP2010/068011 2009-11-10 2010-10-14 Amplificateur, circuit et procédé de compensation de distorsion WO2011058843A1 (fr)

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WO2013063443A1 (fr) 2011-10-27 2013-05-02 Lsi Corporation Processeur comprenant un jeu d'instructions avec des fonctions non linéaires définies par un utilisateur, pour une pré-distorsion numérique (dpd) et d'autres applications non linéaires
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US9363068B2 (en) 2010-08-03 2016-06-07 Intel Corporation Vector processor having instruction set with sliding window non-linear convolutional function
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JP2002057533A (ja) * 2000-05-30 2002-02-22 Matsushita Electric Ind Co Ltd 前置歪み補償回路、低歪み電力増幅器、及びその制御方法
JP2003092518A (ja) * 2001-09-18 2003-03-28 Hitachi Kokusai Electric Inc 歪み補償装置
JP2004040564A (ja) * 2002-07-04 2004-02-05 Fujitsu Ltd 電力増幅器の歪補償方法及びその装置

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JP2002057533A (ja) * 2000-05-30 2002-02-22 Matsushita Electric Ind Co Ltd 前置歪み補償回路、低歪み電力増幅器、及びその制御方法
JP2003092518A (ja) * 2001-09-18 2003-03-28 Hitachi Kokusai Electric Inc 歪み補償装置
JP2004040564A (ja) * 2002-07-04 2004-02-05 Fujitsu Ltd 電力増幅器の歪補償方法及びその装置

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Publication number Priority date Publication date Assignee Title
US9363068B2 (en) 2010-08-03 2016-06-07 Intel Corporation Vector processor having instruction set with sliding window non-linear convolutional function
JP2013042238A (ja) * 2011-08-11 2013-02-28 Fujitsu Ltd 歪補償装置、歪補償方法及び無線送信機
WO2013063443A1 (fr) 2011-10-27 2013-05-02 Lsi Corporation Processeur comprenant un jeu d'instructions avec des fonctions non linéaires définies par un utilisateur, pour une pré-distorsion numérique (dpd) et d'autres applications non linéaires
EP2772032A4 (fr) * 2011-10-27 2015-07-01 Lsi Corp Processeur comprenant un jeu d'instructions avec des fonctions non linéaires définies par un utilisateur, pour une pré-distorsion numérique (dpd) et d'autres applications non linéaires
US9362977B2 (en) 2011-10-27 2016-06-07 Intel Corporation Incremental preamble detection
US9923595B2 (en) 2013-04-17 2018-03-20 Intel Corporation Digital predistortion for dual-band power amplifiers
US9935761B2 (en) 2013-04-17 2018-04-03 Intel Corporation Modeling of a target volterra series using an orthogonal parallel wiener decomposition
US9960900B2 (en) 2013-04-17 2018-05-01 Intel Corporation Modeling of a physical system using two-dimensional look-up table and linear interpolation

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