WO2015096096A1 - Procédé, dispositif et système de rétroaction de pré-distorsion - Google Patents

Procédé, dispositif et système de rétroaction de pré-distorsion Download PDF

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Publication number
WO2015096096A1
WO2015096096A1 PCT/CN2013/090574 CN2013090574W WO2015096096A1 WO 2015096096 A1 WO2015096096 A1 WO 2015096096A1 CN 2013090574 W CN2013090574 W CN 2013090574W WO 2015096096 A1 WO2015096096 A1 WO 2015096096A1
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Prior art keywords
signal
delay
complex gain
predistortion
values
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PCT/CN2013/090574
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English (en)
Chinese (zh)
Inventor
牟青
周键
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201380003111.1A priority Critical patent/CN103858397B/zh
Priority to PCT/CN2013/090574 priority patent/WO2015096096A1/fr
Publication of WO2015096096A1 publication Critical patent/WO2015096096A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems

Definitions

  • the present invention relates to the field of communications, and in particular, to a predistortion feedback method, apparatus, and system.
  • Pre-distortion technology (Pr ed i s t o r t i on , PD) is a widely used linearization technique for RF power amplifiers. Due to its simple principle, this technology has been widely used.
  • the principle of predistortion technology is to obtain the predistortion signal through the inverse model of the power amplifier before sending the original signal to the power amplifier, and then send the predistortion signal to the power amplifier to make the output signal of the power amplifier and the original signal. Maintain good consistency and eliminate linear and nonlinear distortion produced by the power amplifier.
  • the prior art method is to couple a feedback signal at the output of the power amplifier to model the power amplifier inverse model. Since the operating state of the power amplifier changes over time, the prior art uses an analog-to-digital converter to sample the feedback signal and then use it to estimate the predistortion parameters to obtain a predistortion signal.
  • the bandwidth of the analog-to-digital converter needs to be much larger than the original signal bandwidth.
  • the number of samples of the analog-to-digital converter needs to be high to ensure that the dynamic range can be collected into the nonlinear distortion component of the signal outputted from the output of the power amplifier, that is, the intermodulation distortion component.
  • the existing pre-distortion technology requires a high degree of analog-to-digital converter and increases the cost of the pre-distortion technique.
  • the signal bandwidth is increasing, and the analog-to-digital converter is limited by power consumption, cost and license (that is, the number of bits of the analog-to-digital converter and the data throughput capacity are large to some extent, Constrained by conditions such as export control in developed countries, it is difficult for predistortion technology to continue to develop toward greater bandwidth and lower power.
  • the invention provides a predistortion feedback method, device and system, which can reduce pre-missing The bandwidth of the analog-to-digital converter in the real device, which in turn reduces the cost of the predistortion technique.
  • an embodiment of the present invention provides a predistortion feedback method, including: acquiring an original signal from a baseband;
  • the preset delay is used to obtain a value of a delay and a complex gain required to process the original signal, including:
  • the using a preset policy acquiring a delay and a complex time required for processing the original signal
  • the value of the gain including:
  • the values of the delay and the complex gain are determined according to the first data overflow ratio within a range of values of the preset delay and complex gain.
  • the first data overflow ratio is a value of a saturated sample point obtained by sampling the error signal by a total value.
  • the value of the sample point, wherein the saturated sample point is a signal in which the signal bit width in the total sample point is greater than or equal to the width of the predistorter.
  • the ratio is determined, and the values of the delay and the complex gain are determined, including:
  • the statistical feature of the error signal includes a second data overflow ratio or the predistorter converts the error signal The signal power after the digital signal is generated, and the second data overflow ratio is a period of the second preset time period, and the data overflow ratio of the sample points obtained by the predistorter after the error signal is sampled.
  • Performing delay and complex gain processing on the original signal according to the values of the delay and the complex gain including:
  • Subtracting the analog signal from the downconverted feedback signal to obtain an error signal including:
  • an embodiment of the present invention provides a predistortion feedback method, including: receiving an error signal sent by a predistortion feedback device and a value of a delay and a complex gain, where the error signal is an analog signal of the predistortion feedback device Obtaining from the down-converted feedback signal, the analog signal is obtained by the pre-distortion feedback device acquiring the original signal from the baseband, and using a preset strategy, acquiring the required information for processing the original signal a value of a delay and a complex gain, and performing delay and complex gain processing on the original signal according to the values of the delay and the complex gain, and converting the original signal subjected to the delay and the complex gain processing;
  • a predistortion signal is generated based on the values of the delay and complex gain and the error signal.
  • the generating the predistortion signal according to the value of the delay and the complex gain and the error signal specifically:
  • the digital signal is solved according to the values of the delay and the complex gain to generate the predistortion signal.
  • the pre-distorted signal is a zero-frequency signal.
  • an embodiment of the present invention provides a predistortion feedback apparatus, including: an acquiring unit, configured to acquire an original signal from a baseband, and use a preset strategy to obtain a delay and a complex gain required for processing the original signal.
  • a delay complex gain unit configured to perform delay and complex gain processing on the original signal according to the values of the delay and the complex gain
  • a conversion unit configured to convert the original signal processed by the delay and the complex gain into an analog signal
  • a calculating unit configured to subtract the analog signal from the down-converted feedback signal to obtain an error signal
  • a transmitting unit configured to transmit the values of the delay and the complex gain to the predistorter, and transmit the error signal to an analog to digital converter in the predistorter, so that the predistorter is The values of the delay and complex gain and the error signal generate a predistortion signal.
  • the acquiring unit is specifically configured to acquire an original signal from a baseband, and obtain a preset value of the delay and the complex gain.
  • the acquiring unit is specifically configured to acquire an original signal from a baseband, and calculate, by using the first preset time period, the predistorter to The first data overflow ratio of the sample points obtained by the error signal is determined, and the values of the delay and the complex gain are determined according to the first data overflow ratio within a range of values of the preset delay and the complex gain.
  • the first data overflow ratio is a value of a saturated sample point obtained by sampling the error signal by a value of a total sample point, wherein the saturated sample point is in the total sample point
  • the signal bit width is greater than or equal to the signal width of the predistorter.
  • the determining the delay according to the first data overflow ratio And the value of the complex gain including: if the first data overflow ratio is within a preset value range, determining the values of the delay and the complex gain according to the statistical characteristics of the error signal.
  • the statistical feature of the error signal includes a second data overflow ratio or the predistorter converts the error signal The signal power after the digital signal is generated, and the second data overflow ratio is a period of the second preset time period, and the data overflow ratio of the sample obtained by the predistorter after the error signal is sampled.
  • the delay complex gain unit is specifically configured to perform an integer delay or a fractional delay on the original signal according to the values of the delay and the complex gain, and perform amplitude gain and phase gain on the original signal.
  • the calculating unit is specifically configured to subtract the analog signal from the feedback signal in an analog domain, and cancel a linear component of the feedback signal to obtain the error signal.
  • an embodiment of the present invention provides a predistorter, including:
  • a receiving unit configured to receive an error signal sent by the predistortion feedback device and a value of a delay and a complex gain, where the error signal is obtained by subtracting the analog signal from the downconverted feedback signal by the predistortion feedback device
  • the analog signal is obtained by the predistortion feedback device from the baseband, and the original strategy is used to acquire and process the original signal.
  • the signal is converted;
  • a generating unit configured to generate a predistortion signal according to the values of the delay and the complex gain and the error signal.
  • the predistorter further includes:
  • a conversion unit configured to convert the error signal into a digital signal
  • the generating unit is specifically configured to solve the digital signal according to the values of the delay and the complex gain to generate the predistortion signal.
  • the pre-distorted signal is a zero-frequency signal.
  • an embodiment of the present invention provides a predistortion feedback apparatus, including: a digital filter, configured to acquire an original signal from a baseband, and use a preset strategy to obtain a delay and a complex gain required for processing the original signal. a value, according to the value of the delay and the complex gain, performing delay and complex gain processing on the original signal, transmitting the original signal subjected to the delay and complex gain processing to the digital-to-analog converter, and The value of the delay and complex gain is transmitted to the predistorter;
  • the digital-to-analog converter is configured to receive the original signal of the delayed and complex gain processing from the digital filter, convert the original signal processed by the delay and complex gain into an analog signal, and Transmitting the analog signal to an analog subtractor;
  • the analog subtracter is configured to receive the analog signal from the digital-to-analog converter, subtract the analog signal from a down-converted feedback signal to obtain an error signal, and transmit the error signal to the a predistorter for causing the predistorter to generate a predistortion signal based on the values of the delay and complex gain and the error signal.
  • the determining, by using the preset policy, the value of the delay and the complex gain required to process the original signal includes:
  • the determining, by using the preset policy, the value of the delay and the complex gain required to process the original signal specifically:
  • Counting by using the first preset time as a period, a first data overflow ratio of the sample points obtained by the predistorter to the error signal, within a preset delay and a range of complex gains, according to the The first data overflow ratio is determined, and the values of the delay and the complex gain are determined.
  • the first data overflow ratio is a value of a saturated sample point obtained by sampling the error signal by a total value.
  • the value of the sample point, wherein the saturated sample point is a signal in which the signal bit width in the total sample point is greater than or equal to the width of the predistorter.
  • the determining, according to the first data overflow ratio, determining the delay and The value of the complex gain specifically includes:
  • the statistical feature of the error signal includes a second data overflow ratio or the predistorter converts the error signal The signal power after the digital signal is generated, and the second data overflow ratio is a period of the second preset time period, and the data overflow ratio of the sample points obtained by the predistorter after the error signal is sampled.
  • the subtracting the analog signal from the down-converted feedback signal to obtain an error signal includes:
  • an embodiment of the present invention provides a predistorter, including:
  • an analog-to-digital converter configured to receive an error signal sent by the pre-distortion feedback device, wherein the error signal is obtained by subtracting the analog signal from the down-converted feedback signal by the pre-distortion feedback device;
  • a processor configured to receive a value of a delay and a complex gain from the predistortion feedback device, generate a predistortion signal according to the value of the delay and the complex gain, and the error signal; the analog signal is the pre
  • the distortion feedback device acquires the original signal from the baseband, obtains the values of the delay and the complex gain required to process the original signal, and pairs the original signal according to the values of the delay and the complex gain. After performing the delay and complex gain processing, the original signals subjected to the delay and complex gain processing are converted.
  • the analog-to-digital converter is further configured to convert the error signal into a digital signal
  • the generating the predistortion signal according to the value of the delay and the complex gain and the error signal specifically: calculating, according to the values of the delay and the complex gain, the digital signal to generate The predistortion signal.
  • the pre-distorted signal is a zero-frequency signal.
  • a seventh aspect of the present invention provides a predistorter, including:
  • a transceiver module configured to acquire an original signal from a baseband, and send the original signal to an upconversion
  • the transceiver module is further configured to receive a digital signal from an analog to digital converter, where the digital signal is obtained by converting, by the analog to digital converter, an error signal from a predistortion feedback device, where the error signal is
  • the predistortion feedback device subtracts the analog signal from the downconverted feedback signal, wherein the analog signal is obtained by the predistortion feedback device from the baseband, and the original signal is used to acquire and process the original signal. a value of the delay and the complex gain required by the signal, and after the delay and complex gain processing of the original signal according to the values of the delay and the complex gain, the original signal processed by the delay and the complex gain Converted out;
  • a processing module configured to receive a value of a delay and a complex gain sent by the predistortion feedback device, and generate a predistortion signal according to the value of the delay and the complex gain and the digital signal.
  • an embodiment of the present invention provides a predistortion feedback system, including: a predistortion feedback device having any of the above features, and a predistorter having any of the above features connected to the predistortion feedback device.
  • the predistortion feedback method, apparatus or system provided by the embodiment of the present invention eliminates the linear component of the feedback signal, and the nonlinear component of the feedback signal only occupies a small proportion of the signal power of the feedback signal, thus making the low number of bits
  • the analog-to-digital converter can realize the signal sampling.
  • the low-bandwidth analog-to-digital converter can also achieve signal sampling, which reduces the cost of the pre-distortion technology.
  • FIG. 1 is a schematic flowchart of a predistortion feedback method according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of another predistortion feedback method according to an embodiment of the present invention.
  • FIG. 3 is a predistortion feedback method according to an embodiment of the present invention.
  • 4 is a schematic flow chart 4 of another predistortion feedback method according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart diagram of another predistortion feedback method according to an embodiment of the present invention. Fives;
  • FIG. 6 is a schematic structural diagram of a predistortion device according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of a predistorter according to an embodiment of the present invention
  • FIG. 8 is another predistorter according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of another predistortion feedback device according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram 3 of another predistorter according to an embodiment of the present invention;
  • FIG. FIG. 1 is a schematic structural diagram of another predistorter according to an embodiment of the present invention;
  • FIG. 1 is a schematic structural diagram of a predistortion feedback system according to an embodiment of the present invention;
  • FIG. 14 is a schematic structural diagram 2 of another predistortion feedback system according to an embodiment of the present invention.
  • An embodiment of the present invention provides a predistortion feedback method, which is a method for predistortion feedback device side. As shown in FIG. 1, the method includes:
  • the S 1 0 K predistortion feedback device acquires the original signal from the baseband.
  • Pre-distortion technology refers to the pre-distortion signal obtained by the inverse model of the power amplifier before being sent to the power amplifier, and then sent to the power amplifier, so that the output signal of the power amplifier maintains good consistency with the original signal, eliminating the power amplifier.
  • the resulting signal is linear and nonlinearly distorted.
  • the predistortion feedback device obtains the original signal from the baseband, and subtracts the processed original signal from the downconverted feedback signal to cancel out the linear portion of the feedback signal.
  • the error signal is obtained, so that the low-order analog-to-digital converter can achieve the error signal.
  • Baseband refers to the frequency band (frequency bandwidth) inherent in the original electrical signal from the source (information source, also called the transmitting terminal) that is not modulated (spectral shifting and transforming), also called the fundamental frequency band.
  • the predistortion feedback device uses a preset strategy to obtain a value of a delay and a complex gain required to process the original signal.
  • the predistortion feedback device uses a preset strategy, and the values of the delay and the complex gain required to process the original signal include at least the following three implementation manners.
  • the predistortion feedback device acquires the values of the delay and the complex gain set in advance.
  • the value of the preset delay and complex gain may be the value of the preset delay and the complex gain obtained according to prior knowledge, injected small training signal or other estimation methods.
  • the predistortion feedback device counts, according to the first preset time period, a first data overflow ratio of the sample points obtained by the predistorter to the error signal; the predistortion feedback device has a preset delay And determining, in the range of values of the complex gain, the values of the delay and the complex gain according to the first data overflow ratio.
  • the preset value of the preset delay and the complex gain may be obtained by floating the preset value by using the preset value of the delay and the complex gain, for example, preset.
  • the delay and complex gain values are 5, and the preset value of the up and down float is 2, and the obtained preset delay and complex gain ranges from 3 to 7; or, the above-mentioned preset delay and complex
  • the value range of the gain may also be a range of values pre-stored in the pre-distortion feedback device, which is not limited in the present invention.
  • the PD (Predistortion) module the PD algorithm module, and the analog to digital converter are collectively referred to as a predistorter, respectively. Not limited, specific units How to perform signal processing between them will be described in detail in the following embodiments.
  • the predistortion feedback device counts, by using the first preset time period, a first data overflow ratio of the sample points obtained by the predistorter to the error signal, that is, the predistortion feedback device is first preset
  • the time is a period
  • the first data overflow ratio of the sample points obtained by the analog-to-digital converter to the error signal is statistically calculated.
  • the first data overflow ratio is a saturated sample obtained by sampling the error signal, and the value of ⁇ is divided by the value of the total sample point, wherein the saturated sample point is a signal in the total sample point A signal having a bit width greater than or equal to the width of the predistorter.
  • the predistortion feedback device performs the above (2), and if the first data overflow ratio is within a preset value range, the predistortion feedback device determines according to the statistical characteristics of the error signal. The values of the delay and complex gain.
  • the predistortion feedback device determines the values of the delay and the complex gain according to the statistical characteristics of the error signal.
  • the statistical characteristic of the error signal includes a second data overflow ratio or a signal power after the predistorter converts the error signal into a digital signal, and the second data overflow ratio is a second preset time The period is used to count the data overflow ratio of the sample points obtained by the predistorter after the error signal is sampled.
  • the predistortion feedback device performs delay and complex gain processing on the original signal according to the values of the delay and the complex gain.
  • the predistortion feedback device performs delay and complex gain processing on the original signal according to the values of the delay and the complex gain, and the method includes: the predistortion feedback device according to the values of the delay and the complex gain,
  • the original signal performs an integer delay or a fractional delay, and performs amplitude gain and phase gain on the original signal.
  • the predistortion feedback device converts the original signal processed by the delay and complex gain into an analog signal.
  • the predistortion feedback device subtracts the analog signal from the downconverted feedback signal to obtain an error signal.
  • the predistortion feedback device subtracts the analog signal from the downconverted feedback signal to obtain an error signal, including: the predistortion feedback device uses the analog signal The feedback signal is subtracted from the analog domain, and the linear component of the feedback signal is eliminated to obtain the error signal.
  • the predistortion feedback device transmits the values of the delay and complex gain to the predistorter, and transmits the error signal to an analog to digital converter in the predistorter to make the pre
  • the distorter generates a predistortion signal based on the values of the delay and complex gain and the error signal.
  • the predistortion feedback device transmits the values of the delay and complex gain obtained through the above steps to the predistorter, and transmits the error signal obtained in the above step to the analog to digital converter in the predistorter And the predistorter generates a predistortion signal according to the values of the delay and the complex gain and the error signal.
  • the error signal is obtained by subtracting the analog signal from the down-converted feedback signal, the linear component of the feedback signal is eliminated, and the nonlinear component of the feedback signal only accounts for a small proportion of the signal power of the feedback signal, thus making the low position
  • the number of analog-to-digital converters can achieve signal sampling. Furthermore, low-bandwidth analog-to-digital converters can also achieve signal sampling, reducing the cost of pre-distortion technology and avoiding the use of existing large-bandwidth PD solutions.
  • the sweep gathers the feedback signal and the synchronization problem of the forward and feedback signals it faces.
  • the reason why the low bandwidth analog-to-digital converter can achieve signal sampling is: Although in principle, the bandwidth requirement of the analog-to-digital converter is much larger than the original The signal bandwidth can collect the distortion information of the complete feedback signal. However, since the analog signal and the feedback signal are basically aligned in the method of the embodiment of the present invention, an analog-to-digital converter similar to the original signal bandwidth can be selected by changing the modulus. The operating frequency of the converter is segmented in frequency to obtain an error signal outside the original signal bandwidth.
  • the operating frequency of the analog-to-digital converter is first aligned with the center frequency of the original signal. After the analog signal and the feedback signal are completely aligned, the operating frequency of the analog-to-digital converter is adjusted in a specific step, and the entire step is gradually covered. The error signal bandwidth and timing back to the center frequency of the original signal to ensure complete alignment of the analog signal with the feedback signal.
  • the predistortion feedback method provided by the embodiment of the present invention will process the original signal
  • the latter analog signal is subtracted from the down-converted feedback signal to obtain an error signal, which eliminates the linear component of the feedback signal, and the nonlinear component of the feedback signal only accounts for a small proportion of the signal power of the feedback signal, thus making the low number of bits
  • the analog-to-digital converter can realize the signal sampling.
  • the low-bandwidth analog-to-digital converter can also achieve signal sampling, which reduces the cost of the pre-distortion technology.
  • the embodiment of the present invention further provides a predistortion feedback method, which is a method on the predistorter side. As shown in FIG. 2, the method includes:
  • the S 2 0 K predistorter receives the error signal sent by the predistortion feedback device and the values of the delay and the complex gain, wherein the error signal is obtained by subtracting the analog signal from the downconverted feedback signal by the predistortion feedback device
  • the analog signal is obtained by the predistortion feedback device acquiring the original signal from the baseband, and using a preset strategy, acquiring the values of the delay and the complex gain required to process the original signal, and according to the time
  • the value of the delay and the complex gain is obtained by performing delay and complex gain processing on the original signal, and converting the original signal subjected to the delay and complex gain processing.
  • the predistortion feedback device uses a preset policy, and the values of the delay and the complex gain required to process the original signal include at least three implementation manners, which are the same as described in the foregoing embodiment, where Let me repeat.
  • the predistorter generates a predistortion signal according to the values of the delay and the complex gain and the error signal.
  • the predistorter generates a predistortion signal according to the value of the delay and the complex gain and the error signal, including: a predistorter converting the error signal into a digital signal; and the predistorter according to the delay And the value of the complex gain, the digital signal is solved to generate the predistortion signal, and the response condition of the PD can be quickly responded to the state of the power amplifier and the change of the input signal.
  • the predistorter receives the error signal sent by the predistortion feedback device and the values of the delay and the complex gain, and generates according to the values of the delay and the complex gain and the error signal.
  • the error signal is The predistortion feedback device subtracts the analog signal from the downconverted feedback signal, wherein the analog signal is that the predistortion feedback device obtains an original signal from the baseband, and uses a preset strategy to acquire and process the And the value of the delay and the complex gain required by the original signal, and performing delay and complex gain processing on the original signal according to the values of the delay and the complex gain, and then processing the delay and the complex gain
  • the original signal is converted.
  • the predistortion feedback device subtracts the original signal processed analog signal from the downconverted feedback signal to obtain an error signal, and eliminates the linear component of the feedback signal, and the nonlinear component of the feedback signal only accounts for feedback.
  • Embodiment 3 A small proportion of the signal power of the signal, so that the low-frequency analog-to-digital converter can achieve signal sampling, and the low-bandwidth analog-to-digital converter can also achieve signal sampling, reducing the cost of the pre-distortion technology.
  • the embodiment of the invention provides a predistortion feedback method. As shown in FIG. 3, the method includes:
  • the S 3 0 K predistorter acquires the original signal from the baseband.
  • Pre-distortion technology refers to the pre-distortion signal obtained by the inverse model of the power amplifier before being sent to the power amplifier, and then sent to the power amplifier, so that the output signal of the power amplifier maintains good consistency with the original signal, eliminating the power amplifier.
  • the resulting signal is linear and nonlinearly distorted.
  • the frequency band inherent to the unmodulated original signal sent by the source is referred to as a basic frequency band, which is referred to as a baseband.
  • the predistorter acquires the original signal from the baseband.
  • the predistorter transmits the original signal to the upconversion.
  • the predistorter transmits the original signal to upconversion, and upconverting up-converting the original signal, that is, modulating a center frequency of the original signal to a radio frequency; and the upconverting transmitting the modulated original signal a power amplifier; the downconverting acquires a first feedback signal from an output end of the power amplifier; The first feedback signal is subjected to down-conversion processing, that is, the center frequency of the first feedback signal is modulated from radio frequency to an intermediate frequency to generate a down-converted first feedback signal.
  • the predistortion feedback device acquires the down converted first feedback signal.
  • the analog subtractor of the predistortion feedback device acquires the downconverted first feedback signal.
  • the predistortion feedback device acquires the original signal from the baseband.
  • the predistortion feedback device acquires preset values of the first delay and the complex gain.
  • the value of the preset delay and complex gain may be a value of a delay and a complex gain obtained according to a priori knowledge, a small training signal, or other estimation methods.
  • the method for injecting the small training signal to obtain the values of the delay and the complex gain specifically includes: transmitting, by the baseband, a low-power wideband training signal (ie, a small training signal) to a predistorter, such as a pseudorandom signal, and using the predistorter mode
  • a predistorter such as a pseudorandom signal
  • the feedback signal collected by the digital converter is cross-correlated with the small training signal to obtain a value of delay and complex gain.
  • the predistortion feedback device performs delay and complex gain processing on the original signal according to the values of the first delay and the complex gain.
  • the predistortion feedback device performs delay and complex gain processing on the original signal according to the values of the first delay and the complex gain, and the method includes: the predistortion feedback device according to the first delay and the complex gain
  • the value of the original signal is integer delay or fractional delay, and the original signal is subjected to amplitude gain and phase gain.
  • the raw signal obtained by the predistortion feedback device is:
  • the signal after delay and complex gain processing on the original signal is:
  • a and b are complex coefficients
  • j is an imaginary symbol
  • w and w are angular frequencies
  • t is time
  • amplitude and phase of c correspond to amplitude gain and phase gain, respectively
  • tO is time delay, and to is not necessarily An integer multiple of the interval, so it may contain a fractional part. To is a fractional delay if it contains a fractional part, and an integer delay if it does not contain a fractional part.
  • the predistortion feedback device converts the original signal processed by the delay and the complex gain into the first analog signal. Specifically, the digital-to-analog converter of the predistortion feedback device converts the raw signal subjected to the above-described delay and complex gain processing into a first analog signal.
  • S 301 -S 30 3 and S 3 04 -S 307 there is no time limit between S 301 -S 30 3 and S 3 04 -S 307, that is, S 301 -S 3 03 can be executed first, then S 304 -S 3 07 can be executed, or can be executed first. S 304 - S 307 , S 30 S 3 03 is executed again, or S 30 S 303 and S 3 04 - S 307 are simultaneously executed, and the present invention is not limited.
  • the predistortion feedback device subtracts the first analog signal from the downconverted first feedback signal to obtain a first error signal.
  • the predistortion feedback device subtracts the first analog signal from the downconverted first feedback signal to obtain a first error signal, including: the predistortion feedback device, the first analog signal and the first The feedback signal is subtracted in the analog domain, and the linear component of the first feedback signal is eliminated to obtain the first error signal.
  • linear component of the first feedback signal refers to a component of the first feedback signal that can be linearly represented by the original signal.
  • the predistortion feedback device transmits the values of the first delay and the complex gain and the first error signal to the predistorter.
  • the predistortion feedback device transmits the values of the first delay and the complex gain to the PD module of the predistorter, and the predistortion feedback device transmits the first error signal to the analog to digital converter of the predistorter
  • the predistorter is able to quickly track the delay and gain variations of the feedback signal.
  • the predistorter samples the first error signal, and generates a first predistortion signal according to the values of the first delay and the complex gain and the first error signal after the sampling.
  • the predistorter generates a first predistortion signal according to the values of the first delay and the complex gain and the first error signal after the sampling, and the method includes: converting, by the predistorter, the first error signal after the sample is converted And being a digital signal; the predistorter is configured to solve the digital signal according to the values of the first delay and the complex gain to generate the first predistortion signal.
  • the predistorter still needs to acquire the original signal from the baseband in the process of generating the first predistortion signal according to the first error signal and the values of the first delay and the complex gain.
  • the predistorter performs the first error signal, specifically pre-missing
  • the analog to digital converter of the real device samples the first error signal.
  • the signal sample is the discretization of the signal in time, that is, the instantaneous value is obtained point by point on the analog signal X (t) according to a certain time interval ⁇ t .
  • S311-S 320 is further included:
  • the S31K predistorter transmits the first predistortion signal to upconversion.
  • the predistorter transmits the first predistortion signal to upconversion, and the upconversion performs upconversion processing on the first predistortion signal, that is, the first predistortion signal is modulated to a radio frequency; the upconversion will modulate The first pre-distortion signal is transmitted to the power amplifier; the down-conversion obtains a second feedback signal from the output end of the power amplifier; the down-conversion performs down-conversion processing on the second feedback signal, that is, the second feedback The center frequency of the signal is modulated from radio frequency to intermediate frequency to generate a second feedback signal that is downconverted.
  • the predistortion feedback device acquires the second feedback signal that is down-converted.
  • analog subtractor of the predistortion feedback device acquires the downconverted second feedback signal.
  • the predistortion feedback device acquires the original signal from the baseband.
  • the predistortion feedback device uses a first preset time as a period to count a first data overflow ratio of the sample points obtained by the predistorter to the first error signal.
  • the predistortion feedback device determines the values of the second delay and the complex gain according to the first data overflow ratio within a preset delay and a complex gain range.
  • the predistortion feedback device counts, according to the first preset time period, a first data overflow ratio of the sample points obtained by the predistorter to the second error signal, that is, a predistortion feedback device Taking the first preset time as a period, the first analog data overflow ratio of the sample points obtained by the analog to digital converter to the first error signal in the above S310 is calculated.
  • the first data overflow ratio is a value obtained by dividing a saturated sample point obtained by sampling the first error signal by a value of a total sample point, wherein the saturated sample point is in the total sample point
  • the signal bit width is greater than or equal to the signal width of the predistorter.
  • the predistortion feedback device performs delay and complex gain processing on the original signal according to the values of the second delay and the complex gain, and includes: the predistortion feedback device according to the values of the second delay and the complex gain And performing integer delay or fractional delay on the original signal, and performing amplitude gain and phase gain on the original signal.
  • the predistortion feedback device converts the original signal processed by the delay and the complex gain into a second analog signal.
  • the digital-to-analog converter of the predistortion feedback device converts the raw signal subjected to the above-described delay and complex gain processing into a second analog signal.
  • S310-S312 may be executed first, then S313-S317 may be executed, S313-S317 may be executed first, then S310-S312 may be executed, or at the same time
  • S310-S312 and S313-S317 are executed, and the present invention is not limited.
  • the predistortion feedback device subtracts the second analog signal from the downconverted second feedback signal to obtain a second error signal.
  • the predistortion feedback device subtracts the second analog signal from the downconverted second feedback signal to obtain a second error signal, including: the predistortion feedback device, the second analog signal and the second The feedback signal is subtracted in the analog domain, and the linear component of the second feedback signal is eliminated to obtain the second error signal.
  • linear component of the second feedback signal refers to a component of the second feedback signal that can be linearly represented by the original signal.
  • the predistortion feedback device transmits the values of the second delay and the complex gain and the second error signal to the predistorter.
  • the predistortion feedback device transmits the values of the second delay and the complex gain to the PD module of the predistorter, and the analog to digital conversion of the predistortion feedback device to transmit the second error signal to the predistorter Device.
  • the predistorter samples the second error signal, and generates a second predistortion signal according to the values of the second delay and the complex gain and the second error signal.
  • the predistorter generates a second predistortion signal according to the values of the second delay and the complex gain and the second error signal after the sampling, and the method includes: the predistorter to The two error signals are converted into digital signals; the predistorter solves the digital signals according to the values of the second delay and the complex gain to generate the second predistortion signals.
  • the predistorter samples the second error signal
  • the analog to digital converter of the pre-distorter specifically samples the second error signal
  • S 32 0 further includes S 32 1 -S 32 9 :
  • the S 32 K predistorter transmits the second predistortion signal to upconversion.
  • the predistorter transmits the second predistortion signal to upconversion, and the upconversion performs upconversion processing on the second predistortion signal, that is, the second predistortion signal is modulated to a radio frequency; the upconversion will modulate The second pre-distortion signal is transmitted to the power amplifier; the down-conversion obtains a third feedback signal from the output end of the power amplifier; the down-conversion performs down-conversion processing on the third feedback signal, that is, the third feedback The center frequency of the signal is modulated from radio frequency to intermediate frequency.
  • the predistortion feedback device acquires a third feedback signal.
  • analog subtractor of the predistortion feedback device acquires the downconverted third feedback signal.
  • the predistortion feedback device acquires the original signal from the baseband.
  • the predistortion feedback device determines the values of the third delay and the complex gain according to the statistical characteristics of the second error signal.
  • the pre-distortion feedback device statistical analog-to-digital converter has the third data overflow ratio obtained by sampling the second error signal in the above S 32 0 within a preset value range, the pre-distortion feedback device is The statistical characteristics of the second error signal are determined, and the values of the third delay and the complex gain are determined.
  • the statistical characteristic of the error signal includes a second data overflow ratio or a signal power after the predistorter converts the error signal into a digital signal.
  • the second data overflow ratio is a pre-distortion feedback device with a second preset time period, and the analog-to-digital converter of the predistorter is counted after the second error signal is sampled.
  • the data overflow ratio of the obtained sample point; the signal power of the predistorter converting the second error signal into a digital signal is the signal power of the output signal of the analog-to-digital converter of the predistorter.
  • the predistortion feedback device performs delay and complex gain processing on the original signal according to the values of the third delay and the complex gain.
  • the predistortion feedback device performs delay and complex gain processing on the original signal according to the values of the third delay and the complex gain, and includes: the predistortion feedback device according to the values of the third delay and the complex gain And performing integer delay or fractional delay on the original signal, and performing amplitude gain and phase gain on the original signal.
  • the predistortion feedback device predistortion feedback device converts the original signal subjected to the delay and complex gain processing into a third analog signal.
  • the digital-to-analog converter of the predistortion feedback device converts the raw signal subjected to the above-described delay and complex gain processing into a third analog signal.
  • S 32 0-S 32 2 and S 32 3-S 326 there is no time limit between S 32 0-S 32 2 and S 32 3-S 326, that is, S 32 0-S 322 can be executed first, then S 32 3-S 326 can be executed, or The S 32 3 -S 326 is executed, the S 32 0-S 322 is executed, or the S 32 3-S 326 and the S 32 0-S 322 are simultaneously performed, and the present invention is not limited.
  • the predistortion feedback device subtracts the third analog signal from the downconverted third feedback signal to obtain a third error signal.
  • the predistortion feedback device subtracts the third analog signal from the down converted third feedback signal to obtain a third error signal, including: the predistortion feedback device, the third analog signal and the third
  • the feedback signal is subtracted in the analog domain, and the linear component of the third feedback signal is eliminated to obtain the third error signal.
  • linear component of the third feedback signal refers to a component of the third feedback signal that can be linearly represented by the original signal.
  • the predistortion feedback device transmits the values of the third delay and the complex gain and the third error signal to the predistorter.
  • the predistortion feedback device transmits the values of the third delay and the complex gain to the PD algorithm module of the predistorter, and the predistortion feedback device sets the third error signal An analog to digital converter that is transmitted to the predistorter.
  • the predistorter generates a predistortion signal according to the values of the third delay and the complex gain and the third error signal.
  • the predistorter generates a third predistortion signal according to the values of the third delay and the complex gain and the third error signal, including: the predistorter converting the third error signal into a digital signal; The predistorter solves the digital signal according to the values of the third delay and the complex gain to generate the third predistortion signal.
  • an error signal is obtained by subtracting the original signal processed analog signal from the downconverted feedback signal, and the linear component of the feedback signal is eliminated, and the feedback signal is The nonlinear component only accounts for a small proportion of the signal power of the feedback signal, so that the low-frequency analog-to-digital converter can realize the signal sampling. Furthermore, the low-bandwidth analog-to-digital converter can also realize the signal sampling and reduce the pre- The cost of distortion technology.
  • the embodiment of the invention provides a predistortion feedback device 1.
  • the method includes: an acquiring unit 60, configured to acquire an original signal from a baseband, and use a preset policy to obtain a value of a delay and a complex gain required to process the original signal;
  • the delay complex gain unit 6 1 is configured to perform delay and complex gain processing on the original signal according to the values of the delay and the complex gain;
  • a converting unit 62 configured to convert the original signal processed by the delay and the complex gain into an analog signal
  • a calculating unit 6 configured to subtract the analog signal from the down-converted feedback signal to obtain an error signal
  • a sending unit 64 configured to transmit the values of the delay and complex gain to a predistorter, and transmit the error signal to an analog to digital converter in the predistorter, so that the predistorter is based on The values of the delay and complex gain and the error signal generate a predistortion signal.
  • the acquiring unit 60 is specifically configured to obtain an original signal from the baseband, to And obtaining the preset values of the delay and the complex gain.
  • the acquiring unit 60 is configured to obtain an original signal from the baseband, and collect, by using a first preset time period, a first sample point obtained by the predistorter to obtain the sample signal.
  • the data overflow ratio determines the values of the delay and the complex gain according to the first data overflow ratio within a range of values of the preset delay and the complex gain.
  • the first data overflow ratio is a value of a saturated sample point obtained by dividing the error signal by a value of a total sample point, wherein the saturated sample point is a signal bit in the total sample point A signal having a width greater than or equal to the width of the predistorter.
  • determining, according to the first data overflow ratio, the values of the delay and the complex gain including:
  • the statistical characteristic of the error signal includes a second data overflow ratio or a signal power after the predistorter converts the error signal into a digital signal, and the second data overflow ratio is a second preset time For the period, the data overflow ratio of the sample obtained by the predistorter after the error signal is sampled is counted.
  • the delay complex gain unit 6 1 is specifically configured to perform integer delay or fractional delay on the original signal according to the values of the delay and the complex gain, and perform amplitude gain on the original signal. And phase gain.
  • the calculating unit 63 is specifically configured to subtract the analog signal from the feedback signal in an analog domain, and cancel a linear component of the feedback signal to obtain the error signal.
  • the acquiring unit uses the preset strategy to obtain the values of the delay and the complex gain, and the calculating unit subtracts the original signal processed analog signal from the down-converted feedback signal.
  • Error signal eliminating the inverse
  • the linear component of the feedback signal, and the nonlinear component of the feedback signal only accounts for a small proportion of the signal power of the feedback signal, so that the low-frequency analog-to-digital converter can realize the signal sampling, and further, the low-bandwidth analog-to-digital converter Signals can also be achieved, reducing the cost of predistortion techniques.
  • Embodiment 5 Embodiment 5
  • the embodiment of the invention provides a predistorter 2.
  • the method includes: a receiving unit 70, configured to receive an error signal sent by the predistortion feedback device, and a value of a delay and a complex gain, where the error signal is an analog signal sent by the predistortion feedback device And obtaining, by the pre-distortion feedback device, the original signal is obtained from the baseband, and the delay and complex gain required for processing the original signal are obtained by using a preset strategy. a value, and performing delay and complex gain processing on the original signal according to the values of the delay and the complex gain, and converting the original signal subjected to the delay and complex gain processing;
  • the generating unit 7 1 is configured to generate a predistortion signal according to the values of the delay and the complex gain and the error signal.
  • the predistorter 2 further includes:
  • a converting unit 7 configured to convert the error signal into a digital signal
  • the generating unit 7 1 is specifically configured to solve the digital signal according to the values of the delay and the complex gain to generate the predistortion signal.
  • the predistortion signal is a zero frequency signal.
  • the predistorter provided by the embodiment of the present invention subtracts the original signal processed analog signal from the downconverted feedback signal to obtain an error signal, and the linear component of the feedback signal is eliminated, and the nonlinear component of the feedback signal is only It occupies a small proportion of the signal power of the feedback signal, so that the low-frequency analog-to-digital converter can realize the signal sampling. Furthermore, the low-bandwidth analog-to-digital converter can also realize the signal sampling, reducing the pre-distortion technology and the pre-distortion. The cost of the distortor.
  • the embodiment of the invention provides a predistortion feedback device 3.
  • the method includes: a digital filter 90 for obtaining an original signal from a baseband, and using a preset strategy, acquiring a value of a delay and a complex gain required to process the original signal, according to the delay And a value of the complex gain, performing delay and complex gain processing on the original signal, transmitting the original signal subjected to the delay and complex gain processing to the digital-to-analog converter, and transmitting the values of the delay and the complex gain to Predistorter
  • the digital-to-analog converter 9 1 is configured to receive an original signal of the delayed and complex gain processing from the digital filter 90, convert the original signal subjected to the delay and complex gain processing into an analog signal, and The analog signal is transmitted to the analog subtractor 92;
  • the analog subtractor 92 is configured to receive the analog signal from the digital-to-analog converter 9 1 , subtract the analog signal from the down-converted feedback signal to obtain an error signal, and transmit the error signal And the predistorter to cause the predistorter to generate a predistortion signal according to the values of the delay and complex gain and the error signal.
  • the determining, by using the preset policy, the value of the delay and the complex gain required to process the original signal includes:
  • the determining, by using the preset policy, the value of the delay and the complex gain required to process the original signal specifically:
  • Counting by using the first preset time as a period, a first data overflow ratio of the sample points obtained by the predistorter to the error signal, within a preset delay and a range of complex gains, according to the The first data overflow ratio is determined, and the values of the delay and the complex gain are determined.
  • the first data overflow ratio is a value of a saturated sample point obtained by dividing the error signal by a value of a total sample point, wherein the saturated sample point is a signal bit in the total sample point A signal having a width greater than or equal to the width of the predistorter.
  • determining, according to the first data overflow ratio, the delay and The value of the complex gain specifically includes:
  • the statistical characteristic of the error signal includes a second data overflow ratio or a signal power after the predistorter converts the error signal into a digital signal, and the second data overflow ratio is a second preset time For the period, the data overflow ratio of the sample points obtained by the predistorter after the error signal is sampled is counted.
  • the performing delay and complex gain processing on the original signal according to the values of the delay and the complex gain specifically:
  • the subtracting the analog signal from the down-converted feedback signal to obtain an error signal includes:
  • the predistortion feedback device provided by the embodiment of the present invention subtracts the original signal processed analog signal from the downconverted feedback signal to obtain an error signal, and eliminates the linear component of the feedback signal, and the nonlinear component of the feedback signal It only occupies a small proportion of the signal power of the feedback signal, so that the low-frequency analog-to-digital converter can realize the signal sampling. Furthermore, the low-bandwidth analog-to-digital converter can also realize the signal sampling, which reduces the predistortion technology. cost.
  • the embodiment of the invention provides a predistorter 4.
  • the method includes: an analog-to-digital converter 1 0 0 1 , configured to receive an error signal sent by a pre-distortion feedback device, where the error signal is feedback of the pre-distortion feedback device and the down-converted analog signal The signal is subtracted; a processor 1 0 02, configured to receive a value of a delay and a complex gain from the predistortion feedback device, and generate a predistortion signal according to the value of the delay and complex gain and the error signal;
  • the predistortion feedback device acquires an original signal from a baseband, and uses a preset strategy to obtain a value of the delay and a complex gain required to process the original signal, and according to the values of the delay and the complex gain After the original signal is subjected to delay and complex gain processing, the original signal subjected to the delay and complex gain processing is converted.
  • analog to digital converter 1 0 0 1 is further configured to convert the error signal into a digital signal
  • the generating the predistortion signal according to the value of the delay and the complex gain and the error signal specifically: calculating, according to the values of the delay and the complex gain, the digital signal to generate The predistortion signal.
  • the predistortion signal is a zero frequency signal.
  • the analog to digital converter receives the error signal sent by the predistortion feedback device and the values of the delay and the complex gain, where the error signal is the predistortion feedback device and the analog signal and the And obtaining, by the pre-distortion feedback device, the original signal is obtained from the baseband, and the delay and complex gain required for processing the original signal are obtained by using a preset strategy.
  • the processor receives the The delay and complex gain values of the predistortion feedback device generate a predistortion signal based on the values of the delay and complex gain and the error signal. Since the predistortion feedback device subtracts the original signal processed analog signal from the downconverted feedback signal to obtain an error signal, the linear component of the feedback signal is eliminated, and the nonlinear component of the feedback signal only occupies the signal of the feedback signal. A small proportion of power, so that the low-frequency analog-to-digital converter can achieve signal sampling, and then, the low-bandwidth analog-to-digital converter can also achieve signal sampling, reducing the cost of pre-distortion technology.
  • the embodiment of the present invention provides a predistorter 5, as shown in FIG. 11, comprising: a transceiver module 1101, configured to acquire an original signal from a baseband, and send the original signal to an upconversion;
  • the transceiver module 1101 is further configured to receive a digital signal from an analog to digital converter, where the digital signal is obtained by converting an error signal from a predistortion feedback device by the analog to digital converter, where the error signal is
  • the predistortion feedback device subtracts the analog signal from the downconverted feedback signal, wherein the analog signal is that the predistortion feedback device acquires the original signal from the baseband, and uses a preset strategy to acquire and process the The value of the delay and the complex gain required by the original signal, and after the delay and complex gain processing of the original signal according to the values of the delay and the complex gain, the original of the delay and complex gain processing The signal is converted;
  • the processing module 1102 is configured to receive a value of a delay and a complex gain sent by the predistortion feedback device, and generate a pre-shake signal according to the value of the delay and the complex gain and the digital signal.
  • the predistortion feedback device subtracts the original signal processed analog signal from the downconverted feedback signal to obtain an error signal, the linear component of the feedback signal is eliminated, and the feedback is The nonlinear component of the signal only accounts for a small proportion of the signal power of the feedback signal, so that the low-frequency analog-to-digital converter can realize the signal sampling. Furthermore, the low-bandwidth analog-to-digital converter can also achieve signal sampling and reduce The cost of predistortion technology.
  • FIG. 12 is a structural diagram of another predistorter according to an embodiment of the present invention.
  • the computer system may be a processor-based computer.
  • the predistorter includes at least one processor 1201, a communication bus 1202, a memory 1203, and at least one communication interface 1204.
  • the processor 1201 may be a general-purpose central processing unit (CPU), a microprocessor, and an application-specific integrated circuit.
  • ASIC application-specific integrated circuit
  • the communication bus 1202 can include a path for transmitting information between the components.
  • the communication interface 1204 uses devices such as any transceiver for communicating with other devices or communication networks, such as Ethernet, Radio Access Network (RAN), Wireless Local Area Networks (WLAN), and the like.
  • RAN Radio Access Network
  • WLAN Wireless Local Area Networks
  • the computer system includes one or more memories, which may be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM) or Other types of dynamic storage devices that store information and instructions, may also be Electrically Erasable Programmable Read-Only Memory (EEPR0M), Compact Disc Read-Only Memory (CD-ROM) Or other disc storage, disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), disk storage media or other magnetic storage devices, or can be used to carry or store expectations in the form of instructions or data structures Program code and any other medium that can be accessed by a computer, but is not limited thereto. These memories are connected to the processor via a bus.
  • the memory 1203 is configured to store an application code for executing the solution of the present invention, and the application code for executing the solution of the present invention is stored in a memory and controlled by the processor 1401 for execution.
  • the processor 1201 is configured to execute an application stored in the memory 1203.
  • the original signal Acquiring an original signal from the baseband and transmitting the original signal to upconversion; receiving a digital signal from the analog to digital converter, the digital signal being obtained by converting the error signal from the predistortion feedback device by the analog to digital converter And the error signal is obtained by subtracting the analog signal from the down-converted feedback signal by the pre-distortion feedback device, wherein the analog signal is obtained by the pre-distortion feedback device from the baseband
  • the original signal acquires the values of the delay and the complex gain required to process the original signal, and performs delay and complex gain processing on the original signal according to the values of the delay and the complex gain. After that, the original signal subjected to the delay and complex gain processing is converted;
  • the predistortion feedback device uses a preset policy to obtain a method for processing the values of the delay and the complex gain required for processing the original signal, as described in the foregoing method embodiment, and is not repeated here.
  • the method of interacting the predistorter with the predistortion feedback device may refer to the above method embodiment. It will not be described in detail here.
  • the predistorter provided in this embodiment can make the signal conversion of the low-frequency analog-to-digital converter, and the low-bandwidth analog-to-digital converter can also realize the signal sampling, thereby reducing the cost of the pre-distortion technology.
  • Example ten
  • An embodiment of the present invention provides a predistortion feedback system, including any of the predistortion feedback devices shown in FIG. 6 or FIG. 9, and FIG. 7, 8, 9, 1 or 1 2 connected to the predistortion feedback device. Any of the predistorters shown.
  • a predistortion feedback system includes a PD module 50, a PD algorithm module 5 1 , an analog to digital converter 52 , an analog subtractor 5 3 , and a digital to analog converter 54 . And a digital filter 55.
  • the PD module 50, the PD algorithm module 5 1 , and the analog-to-digital converter 52 constitute a predistorter, and the analog subtractor 5 3 , the digital to analog converter 54 and the digital filter 55 constitute a predistortion feedback device.
  • the digital filter 55 obtains the original signal from the baseband, and after obtaining the value of the delay and the complex gain required to process the original signal, using a preset strategy, according to the values of the delay and the complex gain, The original signal is subjected to delay and complex gain processing, and the digital filter 55 transmits the original signal subjected to the delay and complex gain processing to the digital to analog converter 54, which will undergo the processing of the delay and complex gain processing.
  • the PD module 50 receives the values of the delay and the complex gain.
  • the analog-to-digital converter 52 converts the error signal into a digital signal, and transmits the digital signal to the PD algorithm module 51.
  • the PD algorithm module 51 performs model solution calculation and sends the digital signal to the PD module 50.
  • the PD module 50 solves the error signal according to the values of the delay and the complex gain, and obtains the original signal from the baseband, according to the original signal and the solution.
  • the resulting error signal generates a predistortion signal.
  • the predistortion feedback system provided by the embodiment of the present invention eliminates the linear component of the feedback signal, and the nonlinear component of the feedback signal only accounts for a small proportion of the signal power of the feedback signal, thus making the low-order analog-to-digital converter Signals can be sampled, and low-bandwidth analog-to-digital converters can also achieve signal sampling, reducing the cost of pre-distortion techniques. This also reduces the cost of the entire predistortion feedback system.
  • a predistortion feedback system includes a PD module 50, a PD algorithm module 51, an upconversion 56, a power amplifier 57, a down conversion 58, an analog to digital converter 52, and a analog subtraction method.
  • the PD module 50, the PD algorithm module 51, the up-conversion 56, the power amplifier 57, the down-conversion 58 and the analog-to-digital converter 52 constitute a predistorter, and the analog subtractor 53, the digital-to-analog converter 54 and the digital filter 55 constitute a pre- Distortion feedback device.
  • the working process of each unit in the predistortion feedback system includes three states: a pre-synchronization state, a synchronization state, and a tracking state.
  • the pre-sync state can generally refer to the state of the pre-distortion feedback system just after it was turned on.
  • the PD module 50 obtains the original signal from the baseband to generate a predistortion signal, and the PD module 50 sends the predistortion signal to the upconversion 56, and the upconversion 56 modulates the center frequency of the predistortion signal to the radio frequency,
  • the predistortion signal is supplied to a power amplifier 57 which receives a feedback signal from the output of the power amplifier 57 and modulates the center frequency of the feedback signal to the intermediate frequency, and feeds the feedback signal to the analog subtractor 53.
  • the digital filter 55 acquires the original signal from the baseband, and at this time, since the digital filter 55 cannot obtain the values of the delay and the complex gain from the actual signal, the digital filter 55 acquires the aforementioned time set in advance. a value of the delay and the complex gain, wherein the value of the preset delay and the complex gain may be a value of a delay and a complex gain obtained according to a priori knowledge, a small training signal, or another estimation method, and further, digital filtering
  • the device 55 performs delay and complex gain processing on the original signal according to the values of the delay and the complex gain, and then sends the original signal to the digital-to-analog converter 54, and the digital filter 5 5 sends the value of the delay and the complex gain.
  • the digital-to-analog converter 54 converts the original signal into an analog signal and sends it to the analog subtractor 53.
  • the analog subtractor 5 3 obtains the feedback signal and the analog signal, and subtracts the feedback signal and the analog signal in the analog domain to obtain an error signal, and then sends the error signal to the analog-to-digital converter 52.
  • the analog-to-digital converter 52 converts the error signal into a digital signal
  • the digital signal is sent to the PD algorithm module 5 1 , and at the same time, the analog-to-digital converter 52 2 samples the error signal so that the digital filter 55 cycles sexually count the sample points obtained from the samples.
  • the PD algorithm module 5 1 receives the error signal, performs model solution on the error signal, and sends it to the PD module 50.
  • the PD module 50 calculates the error signal based on the values of the delay and the complex gain, and obtains the original signal from the baseband, and generates a predistortion signal based on the original signal and the error signal obtained by the solution.
  • the pre-synchronization state ends and the pre-distortion feedback system enters the synchronization state.
  • the digital filter 55 counts the sample points obtained by the analog-to-digital converter 52 for the error signal by using the first preset time as a period.
  • First data overflow ratio set in advance Within the range of the delay and the complex gain, the values of the delay and the complex gain are determined according to the first data overflow ratio.
  • the specific process includes: the PD module 50 sends the pre-distortion signal to the up-conversion 5 6 , and the up-conversion 56 modulates the center frequency of the pre-distorted signal to the radio frequency, and then sends it to the power amplifier 5 7 and down-converts 58 from the power amplifier 57 .
  • the output of the feedback signal is obtained, and the center frequency of the feedback signal is modulated to the intermediate frequency, and the feedback signal is sent to the analog subtractor 53.
  • the digital filter 55 obtains the original signal from the baseband, and counts the first data overflow ratio of the sample points obtained by the analog-to-digital converter 52 for the error signal by using the first preset time period. Further, the digital filter 55 determines the values of the delay and the complex gain according to the first data overflow ratio within a range of the preset delay and the complex gain, and the preset delay and the complex gain are taken.
  • the value range can be based on the value of the delay and complex gain determined by the pre-synchronization state, and a suitable range of values selected in the field.
  • the digital filter 55 After determining the values of the delay and the complex gain, the digital filter 55 performs the delay and complex gain processing on the original signal according to the values of the delay and the complex gain, and then sends the original signal to the digital-to-analog converter 54, and at the same time, the digital The filter 55 sends the values of the delay and the complex gain to the PD module 50, and the digital-to-analog converter 54 converts the original signal into an analog signal and sends it to the analog subtractor 53.
  • the analog subtractor 5 3 obtains the feedback signal and the analog signal, and subtracts the feedback signal and the analog signal in the analog domain to obtain an error signal, and then sends the error signal to the analog-to-digital converter 52.
  • the analog-to-digital converter 5 2 converts the error signal into a digital signal, and then sends the digital signal to the PD algorithm module 5 1 , and the analog-to-digital converter 52 2 samples the error signal.
  • the PD algorithm module 5 1 receives the error signal, performs model solution on the error signal, and sends it to the PD module 50.
  • the value of the delay and complex gain of the PD module and the error signal are solved according to the values of the delay and the complex gain, and the original signal is obtained from the baseband, and the pre-form is generated according to the original signal and the error signal obtained by the solution. Distortion signal.
  • the predistortion feedback system switches from the synchronous state to the tracking state.
  • the first data overflow ratio obtained by the digital filter 55 is preset. Within the range of values, the digital filter 55 determines the values of the delay and the complex gain based on the statistical characteristics of the error signal when determining the values of the delay and complex gain.
  • the statistical characteristic of the error signal includes a second data overflow ratio or a signal power after the analog-to-digital converter 52 converts the error signal into a digital signal, and the second data overflow ratio is a second preset.
  • the time is a period, and the data overflow ratio of the sample points obtained by the predistorter after the error signal is sampled is counted.
  • the values of the delay and the complex gain determined by the digital filter 55 are basically accurate. Therefore, the values of the delay and the gain need to be dynamically adjusted within a small range, so the second preset period may be It is a preset period longer than the first preset period.
  • the predistortion feedback system ends the tracking state and transitions to the synchronization state.
  • the bandwidth of the analog-to-digital converter needs to be much larger than the original signal bandwidth to collect the distortion information of the complete feedback signal, since the analog signal and the feedback signal are basically aligned in the tracking state, An analog-to-digital converter similar to the original signal bandwidth can be selected.
  • the error signal outside the original signal bandwidth can be obtained by segmentation on the frequency.
  • the operating frequency of the analog-to-digital converter is first aligned with the center frequency of the original signal, and after the analog signal is fully aligned with the feedback signal, the operating frequency of the analog-to-digital converter is specified.
  • the step adjustment adjusts the entire error signal bandwidth step by step and periodically returns to the original signal center frequency to ensure complete alignment of the cancellation signal and the feedback signal.
  • the linear component in the feedback signal is eliminated, and the nonlinear component of the feedback signal only occupies a small proportion of the signal power of the feedback signal, thus causing a low-order analog-to-digital conversion
  • the signal can be sampled, and the low-bandwidth analog-to-digital converter can also achieve signal sampling and reduce the pre-distortion technique.
  • the cost of surgery This also reduces the cost of the entire predistortion feedback system.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used. Combined or can be integrated into another system, or some features can be ignored, or not executed.
  • the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the units described as separate components may or may not be physically separated, and the components displayed as the units may or may not be physical units, and may be located in one place or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiment of the present embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. , including several instructions All or part of the steps of the method of the various embodiments of the present invention are performed by a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor.
  • the foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program code. .

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

Abstract

La présente invention concerne un procédé, un dispositif et un système de rétroaction de prédistorsion, qui se rapportent au domaine des communications et permettent de réduire la bande passante d'un convertisseur A/N dans un dispositif de prédistorsion et de réduire davantage le coût de la technologie de prédistorsion. Le procédé de rétroaction de prédistorsion selon ce mode de réalisation comprend les étapes suivantes : l'acquisition de signaux d'origine à partir d'une bande de base; l'utilisation d'une stratégie prédéfinie pour acquérir les valeurs de retard de temps et de gain complexe requises pour traiter les signaux d'origine; selon les valeurs de retard de temps et de gain complexe, la mise en œuvre d'un traitement de retard de temps et de gain complexe sur les signaux d'origine; la conversion des signaux d'origine après le traitement de retard de temps et de gain complexe en signaux de simulation; la soustraction des signaux de rétroaction après l'abaissement de fréquence à partir des signaux de simulation pour obtenir des signaux d'erreur; la transmission des valeurs du retard de temps et du gain complexe au dispositif de prédistorsion, et la transmission des signaux d'erreur au convertisseur A/N dans le dispositif de prédistorsion de manière à permettre au dispositif de prédistorsion de générer les signaux de prédistorsion en fonction des valeurs de retard de temps et de gain complexe ainsi que des signaux d'erreur.
PCT/CN2013/090574 2013-12-26 2013-12-26 Procédé, dispositif et système de rétroaction de pré-distorsion WO2015096096A1 (fr)

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CN103858397B (zh) * 2013-12-26 2016-09-28 华为技术有限公司 一种预失真反馈方法、装置及系统
WO2016191993A1 (fr) * 2015-05-30 2016-12-08 华为技术有限公司 Système et procédé de correction de pré-distorsion analogique (apd)
CN105897188B (zh) * 2016-03-29 2019-12-20 上海联影医疗科技有限公司 功率放大器的非线性校正方法及系统
US9813190B1 (en) * 2016-07-01 2017-11-07 Intel IP Corporation Pre-distortion calibration
CN106468560B (zh) * 2016-09-13 2019-05-28 Oppo广东移动通信有限公司 基于计步器消息的数据输出方法及装置
WO2019190515A1 (fr) * 2018-03-29 2019-10-03 Intel IP Corporation Annulation de diaphonie pour boucle de rétroaction de prédistorsion numérique
CN108600129B (zh) * 2018-04-13 2020-01-14 维沃移动通信有限公司 信号处理方法及移动终端
CN112068159B (zh) * 2020-08-25 2024-03-26 西安空间无线电技术研究所 一种导航卫星信号质量在轨优化方法
CN112838995B (zh) * 2020-12-31 2023-02-03 北京新岸线移动多媒体技术有限公司 一种宽带数字预失真方法及数字预失真器

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