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WO2006069477A1 - Procede et equipement permettant de simuler une linearisation par predistorsion - Google Patents

Procede et equipement permettant de simuler une linearisation par predistorsion Download PDF

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Publication number
WO2006069477A1
WO2006069477A1 PCT/CN2004/001542 CN2004001542W WO2006069477A1 WO 2006069477 A1 WO2006069477 A1 WO 2006069477A1 CN 2004001542 W CN2004001542 W CN 2004001542W WO 2006069477 A1 WO2006069477 A1 WO 2006069477A1
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Prior art keywords
signal
predistortion
order
unit
frequency
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PCT/CN2004/001542
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English (en)
Chinese (zh)
Inventor
Hongtao Ru
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Zte Corporation
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Application filed by Zte Corporation filed Critical Zte Corporation
Priority to PCT/CN2004/001542 priority Critical patent/WO2006069477A1/fr
Priority to CNB2004800442069A priority patent/CN100525079C/zh
Publication of WO2006069477A1 publication Critical patent/WO2006069477A1/fr

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • 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
    • H03F1/3282—Acting on the phase and the amplitude of the input signal

Definitions

  • the present invention relates to linearization techniques in communication systems, and more particularly to analog predistortion linearization methods and apparatus therein. Background technique
  • the transmitted signal tends to have a wider bandwidth, and the amplitude and phase of the signal also carry information, which greatly increases the peak-to-average ratio of the signal. This makes the nonlinearity of the system more serious.
  • these nonlinearities are very harmful as interference, so the system needs to impose higher requirements on the nonlinearities generated to reduce the effects of nonlinearity.
  • the communication system signal is characterized by wide bandwidth and large peak-to-average ratio, which in turn makes the nonlinearity of the system more serious, because the new frequency component of the wideband signal due to nonlinearity will be more abundant, and in order to peak in the signal Reducing the frequency of regeneration due to peak compression, so to ensure that the transmission channel or equipment works in a better linear region, which also puts great pressure on system design and component design.
  • people In order to meet the system's requirements for linearity, people have to sacrifice efficiency to achieve linearization requirements, and hope to mitigate the contradiction between efficiency and linearity through linearization.
  • linearization techniques include feedforward linearization, feedback linearization, and pre-depreciation linearization.
  • the feedforward linearization technique compares the output nonlinear distortion signal with the input standard signal, extracts the distortion signal, and then adjusts the amplitude and phase of the distortion signal, and at the output end, while ensuring delay matching.
  • the advantage of this technology is that the nonlinear distortion of the power amplifier can be used to eliminate the nonlinear distortion of the power amplifier, so the nonlinear matching is better; the disadvantages are as follows: 1) The primary loop and the error loop need to be well matched. ; 2) Compensating the output power of the distortion signal at the output end; 3)
  • the technology is mainly implemented by the RF circuit, and the productivity is relatively poor; 4)
  • the error power amplifier requires a large power; 5) The efficiency is low.
  • the feedback linearization technique converts the extracted distortion signal from the input terminal to achieve a relative cartridge, but since the delay cannot be matched, the bandwidth is limited and the system is unstable.
  • the pre-distortion technique is to add distortion signals opposite to the channel characteristics to the input standard signal for pre-distortion to eliminate distortion. This technology can make the system have higher efficiency and the circuit is simpler to implement.
  • Predistortion technology is divided into analog predistortion technology and digital predistortion technology.
  • Analog pre-distortion technology uses analog circuits to achieve pre-distortion.
  • One solution is to use some analog devices with characteristics that are opposite to the nonlinearity of the signal transmission channel or device. This method is relatively simple, but has poor consistency and is difficult to mass produce.
  • Another scheme is realized by using an analog operation circuit, and the distortion signal is calculated by the analog operation circuit, thereby realizing the weakening or eliminating of the nonlinear distortion, but the scheme relies on the characteristics of the analog device, and the effect of the predistortion is affected by the characteristics of the analog device. The impact is large and the circuit form is relatively complicated.
  • the characteristics of the analog device or the analog operation circuit can be completely opposite to the characteristics of the channel or device to be pre-distorted, and can only be approximated, and the matching interval is small, which also brings difficulties to debugging and production. .
  • the digital pre-distortion technique usually saves the pre-distortion parameters in a look-up table (LUT). Different input I and Q signals call different compensation amounts ⁇ , AQ, and then it)?t
  • the output's distortion detection adaptively refreshes the predistortion parameters in the LUT, ultimately achieving a good predistortion effect.
  • the digital predistortion technology can also first establish a model of the distorted signal, and add the calculated distorted signal as a compensation signal to the signal transmission channel and device, and then adaptively adjust the parameters of the predistortion signal through the output distortion detection. , thereby achieving the function of weakening and eliminating signal distortion.
  • Another object of the present invention is to provide an apparatus for realizing the above-described analog predistortion linearization method, which realizes a single cartridge and has good productivity.
  • an analog predistortion linearization method including: performing amplitude adjustment on an input signal, and converting to an intermediate frequency or a low frequency; generating a predistortion signal; adding the predistortion signal to a delay matching process
  • the input signals are transmitted together; the transmitted signal is subjected to distortion detection, and the amplitude and phase parameters of the predistortion signal are adaptively optimized.
  • the step of generating a predistortion signal further comprises: calculating a third-order predistortion signal generated by the frequency-converted input signal; performing frequency conversion on the third-order pre-distortion signal to restore the original frequency;
  • the predistortion signal is adjusted for amplitude and phase.
  • the step of generating a predistortion signal further comprises: calculating a third-order predistortion signal generated by the converted input signal; calculating a fifth-order predistortion signal according to the converted input signal and the third-order predistortion signal; Performing delay matching on the third-order and fifth-order predistortion signals; performing frequency conversion on the two pre-distortion signals to restore the original frequency; and performing amplitude and phase adjustment on the two pre-distorted signals after frequency conversion;
  • the two predistortion signals are combined into a new predistortion signal.
  • the step of generating a predistortion signal further comprises: calculating a third order predistortion signal generated by the frequency converted input signal; calculating a fifth order predistortion signal according to the frequency converted input signal and the third order predistortion signal; Converting the input signal, the third-order distortion signal and the fifth-order distortion signal to calculate a seventh-order distortion signal; delay matching the third-order, fifth-order, and seventh-order distortion signals; and performing the third-order, fifth-order and The seventh-order predistortion signal is subjected to delay matching; the three predistortion signals are frequency-converted to restore the original frequency; and the three pre-distorted signals after the frequency conversion are adjusted in amplitude and phase; The distorted signal is synthesized into a new predistorted signal.
  • an apparatus for implementing the above-described analog predistortion linearization method including: a predistortion processing module and an adaptive processing module respectively located at a transmitting channel or a device input end and an output end of a communication system;
  • the predistortion processing module is configured to generate a predistortion signal and add the input signal
  • the method includes: a signal distribution unit, configured to divide the original input signal into two input signals, where the second input signal is used to generate a predistortion signal;
  • a first delay matching unit configured to perform delay matching on the first input signal
  • An amplitude adjustment unit configured to adjust an amplitude of the second input signal
  • a first frequency conversion unit configured to frequency-convert the second input signal after the adjustment amplitude to an intermediate frequency or a low frequency
  • a predistortion signal generating unit configured to generate a predistortion signal
  • a first combining unit configured to synthesize the first input signal after delay matching with the pre-false signal
  • the adaptive processing module includes:
  • a distortion detecting unit configured to extract and detect a distortion signal from the output signal
  • An adaptive processing and control unit for processing and analyzing the distorted signal to optimize amplitude and phase parameters of the predistorted signal.
  • the predistortion signal generating unit further includes:
  • a third-order predistortion signal generating unit configured to generate an original third-order predistortion signal
  • a second frequency conversion unit configured to frequency convert the original third-order predistortion signal to an original frequency
  • a first phase adjustment unit configured to perform amplitude and phase on the third-order predistortion signal output by the second frequency conversion unit Adjustment.
  • the predistortion signal generating unit further includes:
  • a second delay matching unit configured to perform delay matching on the original third-order predistortion signal
  • a fifth-order predistortion signal generating unit configured to generate an original fifth-order predistortion signal
  • a third frequency conversion unit configured to: convert the original fifth-order predistortion signal to an original frequency; and a second phase adjustment unit configured to perform amplitude and phase on the fifth-order predistortion signal output by the third frequency conversion unit Adjustment;
  • a second combining unit configured to synthesize the predistortion signals output by the first and second phase adjustment units into a new predistortion signal
  • the second frequency conversion unit is configured to perform third-order pre-distortion of the output of the second delay matching unit The signal is converted to the original frequency.
  • the predistortion signal generating unit further includes:
  • a third delay matching unit configured to perform delay matching on the original fifth-order predistortion signal
  • a seventh-order predistortion signal generating unit configured to generate an original seventh-order predistortion signal
  • a fourth frequency conversion unit configured to be original
  • the seventh-order predistortion signal is frequency-converted to the original frequency
  • the third phase adjustment unit is configured to adjust the amplitude and phase of the seventh-order predistortion signal output by the fourth frequency conversion unit
  • the third frequency conversion unit is configured to frequency-convert the fifth-order predistortion signal output by the third delay matching unit to an original frequency
  • a second combining unit configured to synthesize the predistortion signals output by the first, second, and third phase adjustment units into a new predistortion signal.
  • the method and device of the invention adopts an analog method to generate a predistortion signal, which can realize a wide frequency band and a dynamic range, and the predistortion signal is generated at an intermediate frequency or a low frequency, has strong achievability and productivity, and has low cost.
  • the invention can achieve a good linearization effect by establishing a better nonlinear model, can reduce or eliminate nonlinear distortion in the system, and reduce power backoff caused by nonlinearity, thereby improving system efficiency. Can be applied to systems with nonlinearity and limited nonlinear distortion.
  • the power of the predistortion signal is small, and the effect on efficiency is also low.
  • FIG. 1 is a flow chart of an analog predistortion linearization method according to an embodiment of the present invention
  • FIG. 2 is a flow chart of generating a predistortion signal in FIG. 1, wherein the predistortion signal is a three-dimensional H3 ⁇ 4 distortion signal;
  • FIG. 3 is a flow chart of generating a predistortion signal in FIG. 1, wherein the predistortion signal is a third-order and fifth-order pre-distortion signal;
  • FIG. 4 is a flow chart of generating a predistortion signal in FIG. 1, wherein the predistortion signals are third-order, fifth-order, and seventh-order predistortion signals;
  • Figure 5 is a diagram of a device for implementing analog predistortion linearization in accordance with one embodiment of the present invention
  • Figure 6 is a schematic view of the first frequency conversion unit of Figure 5;
  • Figure 7 is a schematic diagram of the predistortion signal generating unit of Figure 5;
  • Figure 8 is a block diagram showing the construction of an apparatus for implementing analog predistortion linearization in accordance with another embodiment of the present invention. detailed description
  • step 100 the input signal is amplitude-adjusted, and the purpose is that the amplitude of the input signal is suitable for the processing of the analog operation, and the adjustment amount of the signal amplitude is determined according to the size of the input signal, and the input signal can be established. For the correspondence table of the amplitude adjustment amount, different input signals use different adjustment amounts.
  • step 110 the amplitude-adjusted signal is downconverted, and its frequency is changed to an intermediate frequency or a low frequency. In order to avoid interference of unwanted signals, the frequency-converted signal is also filtered and amplified.
  • a predistortion signal is generated using the above processed signal, and the generation of the predistortion signal will be described in detail later.
  • the generated predistortion signal is added to the input signal subjected to the delay matching process, and then transmitted together through the transmission channel or device.
  • the transmitted signal is subjected to distortion detection, a distortion signal is extracted, and the distortion signal is analyzed in step 150 to adaptively optimize the amplitude and phase parameter control signals of the predistortion signal.
  • the control signal is fed back to step 120 to generate a predistortion signal along with the other signals, and then to steps 130, 140 and 150, which ultimately minimizes the amplitude of the distortion detected distortion signal.
  • step 201 the third-order predistortion signal generated by the down-converted input signal is calculated, and then in step 205, the frequency of the third-order predistortion signal is changed to the original frequency, and finally, in step 210, the up-converted
  • the amplitude and phase of the third-order predistortion signal are adjusted to produce an amplitude equal to the amplitude of the nonlinear distortion produced by the transmitting channel or device, Predistortion signals with opposite phases.
  • the amplitude and phase adjustment signals of the predistortion signal are derived from the control signals generated in step 150.
  • step 120 of generating a predistortion signal in FIG. 1 is a third-order and fifth-order pre-distortion signal, wherein the same steps as in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted. Description.
  • a fifth-order predistortion signal is calculated based on the downconverted input signal and the third-order predistortion signal.
  • step 315 the fifth-order predistortion signal is upconverted to restore its original frequency.
  • step 320 the amplitude and phase are adjusted for the upconverted fifth order predistortion signal.
  • the amplitude and phase adjustment signals of the predistortion signal are also derived from the control signals generated in step 150.
  • step 325 the two predistorted signals are combined into a new predistorted signal to produce a predistorted signal having an amplitude equal to the amplitude of the nonlinear distortion produced by the transmitting channel or device.
  • step 120 is a flow chart showing the step 120 of generating a predistortion signal in FIG. 1 in the case where the predistortion signals are third-order, fifth-order, and seventh-order predistortion signals, wherein the same steps as in FIGS. 2 and 3 are the same. Mark and omit its description.
  • the seventh-order distortion signal is calculated based on the down-converted input signal, the third-order predistortion signal, and the fifth-order predistortion signal.
  • the fifth-order predistortion signals are also delayed in step 415. match.
  • the three-phase five-stage predistortion signal that has undergone delay matching is upconverted in steps 205 and 315, respectively.
  • the seventh-order predistortion signal is upconverted to restore the original frequency.
  • the amplitude and phase are adjusted for the up-converted seventh-order predistortion signal, and the amplitude and phase adjustment signals are also derived from the control signals generated in step 150.
  • the three pre-distorted signals are combined into a new pre-distorted signal to obtain a pre-distorted signal having the same amplitude and opposite phase as the nonlinear distortion produced by the transmitting channel or device.
  • the predistortion signal can be generated at the intermediate frequency or the low frequency, and the amplitude and phase adjustment of the predistortion signal can be completed on the radio frequency, which can effectively eliminate the system. Distortion, improve efficiency.
  • the third-order, fifth-order, and seventh-order predistortion signals can be independently controlled, which can better eliminate the distortion signal, and finally achieve an optimal predistortion effect, and the required predistortion signal can be pre-predicted according to The characteristics of the distorted channel and device are determined, that is, only the third-order predistortion signal, or the third-order and fifth-order pre-distortion signals, or the third-order, fifth-order, and seventh-order predistortion signals, or even higher-order predistortion can be required. signal.
  • the adaptive control adopted in this embodiment is relatively simple, and the parameters processed by the adaptive algorithm are specific physical quantities, and the influence of these physical quantities on the result has only one extreme value, so it is easy to converge.
  • FIG. 5 is a block diagram showing the structure of an apparatus for implementing analog predistortion linearization, in accordance with one embodiment of the present invention.
  • the apparatus includes a predistortion processing module 50 and an adaptive processing module 60.
  • the original input signal generates an input signal with a predistortion signal through the predistortion processing module 50, and outputs the same to a transmission channel or device for transmission.
  • the adaptive processing module 60 extracts the distorted signal from the output signal and detects it, and then adaptively adjusts the amplitude and phase parameters of the predistorted signal.
  • the predistortion processing module 50 includes: a signal distribution unit 501, which divides the original input signal into two input signals, wherein the first input signal still maintains the original input signal, only the delay operation is performed, and the second input signal is used to generate
  • the first delay matching unit 502 performs delay matching on the first input signal to match the generated predistortion signal on the delay; the amplitude adjustment unit 503 can be based on the size of the original input signal.
  • the first frequency conversion unit 504 wherein the input signal after the amplitude adjustment is down-converted, and the frequency is changed to an intermediate frequency or a low frequency
  • the first combining unit 506 synthesizes the first input signal that is subjected to delay matching and the generated predistortion signal, and outputs the same to the transmission channel or device.
  • the adaptive processing module 60 includes: a distortion detecting unit 601, which extracts a distortion signal from an output signal at an output end of the transmitting channel or device, and detects the same; the adaptive processing and control unit 602 further processes the result according to the detection result. And analyzing the distorted signal to produce a signal that controls the amplitude and phase of the predistorted signal to optimize the amplitude and phase parameters of the predistorted signal to minimize the detected distorted signal. ⁇ The operation of the apparatus for implementing analog predistortion linearization shown in FIG.
  • the signal distribution unit 501 is divided into two input signals, wherein the first 5» input signal input
  • the predistortion signal generated by the second input signal is matched on the delay to ensure that the delays of the two signals are matched, that is, the two signals are in the same period.
  • the second input signal is used to generate a pre-distortion signal.
  • the input signal is amplitude-adjusted in the amplitude adjusting unit 503 to make the amplitude suitable for the processing of the pre-distortion signal generating unit 505; the magnitude of the signal amplitude adjustment is determined by the size of the input signal.
  • a correspondence table can be established in advance according to the size and adjustment amount of the input signal, and different input signals call different adjustment amounts.
  • the frequency of the signal is then changed to an intermediate frequency or a low frequency in the first frequency converting unit 504 to facilitate the processing of the predistortion signal generating unit 505.
  • the converted signal is input to the predistortion generating unit 505 to generate a predistortion signal.
  • the predistortion signal and the delay matched first input signal are combined in a combined path unit 506 and then output to a transmit channel or device for transmission.
  • the distortion detecting unit 601 extracts the distortion signal from the output signal and performs detection, and then the distortion signal is further processed and analyzed in the adaptive processing and control unit 602 to adaptively generate the pre-
  • the amplitude control signal and the phase control signal of the distorted signal are optimally adjusted for the amplitude and phase of the predistorted signal.
  • the adaptive processing and control unit 602 also generates a control signal A1 to the amplitude adjustment unit 503 to optimize the amplitude adjustment of the input signal.
  • A1 is used to adjust the amplitude of entering the predistortion circuit, so that its amplitude is most suitable for the processing of the predistortion circuit. Its value is related to the input signal size.
  • the LUT table can be used, and different input signals can be called differently. The value of A1.
  • the first frequency conversion unit 504 further includes: a local oscillation signal unit 5041 that provides a local oscillation signal; and a first amplification circuit 5042 that amplifies the local oscillation signal to drive the following description.
  • the second amplifying circuit 5045 amplifies the filtered signal.
  • the first frequency conversion unit 504 by setting the local oscillation signal unit 5041, a suitable local oscillation signal can be obtained, and the frequency of the local oscillation signal is related to the intermediate frequency.
  • Local oscillator signal passes first After the amplification of the amplifying circuit 5042, the driving mixer 5043 performs frequency conversion; the input signal adjusted by the amplitude adjusting unit 503 is input to the mixer 5043 for frequency conversion, so that the frequency of the input signal is changed to the intermediate frequency.
  • the converted signal is input to the low-pass filter 5044 for filtering. Because the frequency of the frequency-converted signal is noisy, it is necessary to filter out the interference, and only the required intermediate frequency signal is passed, and the signals of other frequencies are suppressed.
  • the filtered signal is amplified by a second amplifying circuit 5045 to a suitable amplitude to ensure the amplitude of the signal entering the predistortion signal generating unit 505.
  • FIG. 7 is a schematic diagram of the predistortion signal generating unit 505.
  • the predistortion signal generating unit 505 includes a third-order predistortion signal generating unit 521, which can be implemented by an analog operation circuit whose frequency is an intermediate frequency or a low frequency.
  • the third-order predistortion signal generating unit 521 calculates the original third-order predistortion signal which the signal will generate based on the input signal, and outputs it to the second frequency converting unit 522.
  • the second frequency conversion unit 522 can convert the calculated original third-order predistortion signal to the original frequency of the input signal. To ensure the stability of the frequency, the entire local frequency conversion process uses the same local oscillator signal.
  • the converted signal is output to the first phase adjustment unit 523.
  • the first phase adjustment unit 523 performs amplitude and phase adjustment on the third-order predistortion signal that returns to the original frequency, and the amplitude and phase adjustment control signals are the control signals A2 and P1 output by the adaptive processing and control unit 602. Where A2 is used to control the amplitude of the third-order predistortion signal, and P1 is used to control the phase of the third-order predistortion signal.
  • the adjusted third-order predistortion signal is equal in amplitude and opposite in phase to the nonlinear distortion produced by the transmit channel or device, thereby attenuating or eliminating nonlinear distortion generated by the transmit channel or device.
  • the first phase adjustment unit 523 outputs the signal to the first combining unit 506.
  • the predistortion signal generating unit 505 may further include: a fifth-order predistortion signal generating unit 524 that may generate an original fifth-order predistortion signal.
  • the original fifth-order predistortion signal is associated with the original third-order predistortion signal, and the fifth-order predistortion signal generation unit 524 calculates the original fifth-order predistortion signal based on the signal output by the first frequency conversion unit 504 and the original third-order predistortion signal.
  • the original third-order predistortion signal Since the original third-order predistortion signal has a delay mismatch with the original fifth-order predistortion signal, delay matching of the original third-order predistortion signal is performed, which is implemented by the second delay matching unit 525, and then The delay-matched third-order predistortion signal is frequency-converted in the second frequency conversion unit 522. The original fifth-order predistortion signal is frequency-converted in the third frequency conversion unit 526 to restore the original frequency, and the local oscillator signal used for the frequency conversion is unchanged.
  • the fifth-order predistortion signal after frequency conversion passes through the second phase adjustment sheet
  • the element 527 performs amplitude and phase adjustment, and the amplitude and phase adjustment control signals are control signals A3 and P2 output by the adaptive processing and control unit 602, wherein A3 is used to control the amplitude of the fifth-order predistortion signal, and P2 is used for control.
  • the adjusted predistortion signal is equal in magnitude and opposite in phase to the nonlinear distortion produced by the transmit channel or device, thereby attenuating or eliminating nonlinear distortion produced by the transmit channel or device.
  • the predistortion signal generating unit 505 further includes a second combining unit 528, and synthesizes the predistortion signals output by the first amplitude adjusting unit 523 and the second amplitude adjusting unit 527 into a new predistortion signal, and outputs the first pre-distortion signal to the first combination.
  • a second combining unit 528 synthesizes the predistortion signals output by the first amplitude adjusting unit 523 and the second amplitude adjusting unit 527 into a new predistortion signal, and outputs the first pre-distortion signal to the first combination.
  • the predistortion signal generating unit 505 may further include: a seventh-order predistortion signal generating unit 529, and calculating the original seventh-order predistortion according to the signal output by the first frequency converting unit 504 and the original third-order predistortion signal and the original fifth-order predistortion signal signal. Similarly, since the original three-distortion signal, the original fifth-order pre-distortion signal and the original seventh-order pre-distortion signal have a delay mismatch, the original third-order pre-distortion signal and the original fifth-order pre-distortion signal are subjected to delay matching.
  • the delay matching of the original three-distortion signal is implemented by the second delay matching unit 525, and the delay matching of the original fifth-order pre-distorted signal is implemented by the third delay matching unit 530, thereby realizing the delay of the three pre-distorted signals. Matches when.
  • the fifth-order predistortion signal subjected to delay matching is frequency-converted by the third frequency conversion unit 526.
  • the original seventh-order predistortion signal is frequency-converted in the fourth frequency conversion unit 531, and the original frequency is restored and output to the third phase adjustment unit 532.
  • the third phase adjustment unit 532 performs amplitude and phase adjustment on the seventh-order predistortion signal, and the amplitude and phase adjustment control signals are control signals A4 and P3 output by the adaptive processing and control unit 602, wherein A4 is used to control seven
  • the amplitude of the pre-distortion signal, P3 is used to control the phase of the seventh-order predistortion signal.
  • the adjusted predistortion signal is equal in magnitude and opposite in phase to the nonlinear distortion produced by the transmit channel or device, thereby attenuating or eliminating nonlinear distortion produced by the transmit channel or device.
  • the second combining unit 528 synthesizes the predistortion signals output by the first phase adjustment unit 523, the second phase adjustment unit 527, and the third phase adjustment unit 532 into a new predistortion signal, and outputs the same to the first combining unit. 506.
  • the attenuator can be used to adjust the amplitude
  • the phase shifter can adjust the phase
  • the vector modulator can be used to simultaneously adjust the amplitude and phase.
  • this embodiment uses an analog linear operation circuit to generate a predistortion signal. No., does not rely on the baseband I, Q signal, greatly increases the dynamic range of the application and improves the productivity, and can generate third-order, fifth-order and seventh-order predistortion signals relatively independently; and the analog operation circuit realizes the single. Electromagnetic compatibility problems are easy to solve and low in cost. In addition, this embodiment can realize a very wide-band pre-distortion process, such as a bandwidth from hundreds of megabytes to upper G.
  • Fig. 8 is a view showing the configuration of an apparatus for realizing analog predistortion linearization according to another embodiment of the present invention, wherein the same elements as those of Figs. 5 and 7 are denoted by the same reference numerals and the description thereof will be omitted.
  • the phase adjustment of the predistortion signal in the foregoing embodiment is different on the main path of the predistortion signal.
  • the phase adjustment of the predistortion signal is realized on the phase shift of the local oscillation signal.
  • the pre-distortion signal generating unit 505 further includes a first local oscillator phase shifting unit 541, which shifts and amplifies the local oscillator signal, and outputs the signal to the second frequency converting unit 522, where the control signal of the shifting item is The control signal P1 output by the adaptive processing and control unit 602; the second local oscillator phase shifting unit 544 shifts and amplifies the local oscillator signal, and outputs the signal to the third frequency converting unit 526, wherein the control signal of the shifting item is adaptive processing and The control signal P2 output by the control unit 602; the third local oscillator phase shifting unit 546 shifts and amplifies the local oscillator signal, and outputs the signal to the fourth frequency converting unit 531, wherein the control signal of the shifting item is the output of the adaptive processing and control unit 602.
  • the method further includes: a first amplitude adjustment unit 542, performing amplitude adjustment on the frequency-converted third-order predistortion signal, wherein the amplitude adjustment control signal is the control signal A2 output by the adaptive processing and control unit 602; and the second amplitude adjustment unit 545, performing amplitude adjustment on the converted fifth-order predistortion signal, wherein the amplitude adjustment control signal is the control signal A3 output by the adaptive processing and control unit 602; the third amplitude adjustment unit 547, the seventh-order predistortion after the frequency conversion
  • the signal is amplitude adjusted, wherein the amplitude adjusted control signal is the control signal A4 output by the adaptive processing and control unit 602.
  • the same local oscillator signal is used.
  • the phase adjustment of the predistortion signal can be completed on the local oscillator. Since the local oscillator signal is a single tone signal, there is no disadvantage of in-band amplitude, phase, and delay unevenness. Avoid in-band unevenness caused by the phase adjustment unit when the bandwidth is wide, and amplitude variation caused when the phase is adjusted.
  • the present invention can be applied to the reduction and elimination of nonlinear distortion, and the present invention can be employed wherever there is nonlinear distortion. Specifically, the present invention can be applied to the transmission of a mobile communication system. A channel or device that transmits a channel or device, a data transmission system, and a transmission channel or device for optical communication.
  • the present invention has been described in detail with reference to the preferred embodiments of the present invention, but by way of example only, those skilled in the art Examples are replaced and modified. The scope of the invention is defined by the appended claims.

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Abstract

L'invention concerne un procédé permettant de simuler une linéarisation par prédistorsion, consistant : à ajuster l'amplitude du signal d'entrée et à convertir la fréquence à la fréquence intermédiaire ou à la basse fréquence ; à produire un signal de prédistorsion ; à ajouter ledit signal de prédistorsion au signal d'entrée pour les transmettre ensemble, les signaux étant traités afin que leur retard corresponde ; et à détecter la distorsion du signal transmis et à optimiser par adaptation l'amplitude du signal de prédistorsion et le paramètre de phase. L'invention permet d'éliminer le phénomène de non-linéarité produit par le dispositif ou le canal de transmission, car il produit une simulation d'un signal de prédistorsion à exposant 3, 5, 7 ou sensiblement supérieur, et un ajustement par adaptation par la détection de distorsion en sortie. L'invention est facile à produire et à mettre en oeuvre et économique.
PCT/CN2004/001542 2004-12-28 2004-12-28 Procede et equipement permettant de simuler une linearisation par predistorsion WO2006069477A1 (fr)

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CN109217828A (zh) * 2018-11-12 2019-01-15 京信通信系统（中国）有限公司 一种模拟预失真电路及模拟预失真时分对消方法

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CN109217828A (zh) * 2018-11-12 2019-01-15 京信通信系统（中国）有限公司 一种模拟预失真电路及模拟预失真时分对消方法
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