WO2017015888A1 - Procédé et dispositif pour réduire le rapport valeur de crête sur valeur moyenne (par) - Google Patents

Procédé et dispositif pour réduire le rapport valeur de crête sur valeur moyenne (par) Download PDF

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Publication number
WO2017015888A1
WO2017015888A1 PCT/CN2015/085388 CN2015085388W WO2017015888A1 WO 2017015888 A1 WO2017015888 A1 WO 2017015888A1 CN 2015085388 W CN2015085388 W CN 2015085388W WO 2017015888 A1 WO2017015888 A1 WO 2017015888A1
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Prior art keywords
time domain
peak
signal
data signal
domain data
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English (en)
Chinese (zh)
Inventor
孙方林
潘众
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2015/085388 priority Critical patent/WO2017015888A1/fr
Priority to CN201580076783.4A priority patent/CN107251502B/zh
Publication of WO2017015888A1 publication Critical patent/WO2017015888A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a method and apparatus for reducing a peak-to-average ratio.
  • the peak-to-average ratio (Pan-to-Average Ratio), referred to as the peak-to-average ratio, is a measurement parameter for the waveform, which is equal to the ratio of the maximum power value of the time domain data signal divided by the average power value. .
  • the maximum value of PAR also increases, which places high demands on the linear range of the front end power amplifier of the transmitting end.
  • the amplifier is linear as long as the instantaneous energy value or amplitude value of the signal is less than the maximum output value of the power amplifier; nonlinear distortion occurs once the instantaneous energy value or amplitude value of the signal exceeds the maximum output value.
  • the method of suppressing PAR is more reserved by the reserved subcarrier method (Tone Reservation, English abbreviation TR).
  • the reserved subcarrier method is implemented by selecting some subcarriers for transmitting data among the “in-band” N subcarriers, and the remaining other subcarriers are referred to as reserved subcarriers.
  • the PAR of the output signal can be reduced by inserting a preset frequency domain base signal for peak cancellation onto the reserved subcarrier.
  • the reserved subcarriers used for peak cancellation cannot transmit data, and are only used to cancel the signal peaks superimposed by other subcarriers.
  • the PAR suppression performance of the TR is closely related to the number of reserved subcarriers, and the reserved subcarriers used for peak cancellation cannot transmit data. Therefore, the reserved subcarriers result in a decrease in the data rate and performance of the system.
  • the technical problem to be solved by the present invention is to provide a method and apparatus for reducing the peak-to-average ratio, which can reduce the data rate and performance of the system when the PAR is reduced.
  • the present invention provides a method for reducing a peak-to-average ratio, comprising: searching for a peak of a time domain data signal; and if at least one peak of the peak of the searched time domain data signal exceeds a preset threshold, And then canceling, by the pre-generated time domain base signal, the at least one peak of the time domain data signal to reduce a peak value of the time domain data signal, wherein the time domain based signal is used for reservation A time domain signal generated by a carrier, the predetermined carrier being an outband carrier and/or an inband carrier.
  • Step of canceling the at least one peak value of the time domain data signal to reduce a peak value of the time domain data signal comprising: if present in a peak of the searched time domain data signal And shifting a peak of the pre-generated time domain base signal to a peak position corresponding to the at least one peak peak of the time domain data signal, or the time domain, when the at least one peak value exceeds a preset threshold A peak of the data signal is shifted to a peak position corresponding to the at least one peak peak of the pre-generated time domain based signal; the time domain based signal is linearly scaled to linearly scale the time domain base
  • the signal is used as a cancellation signal; the at least one peak value of the time domain data signal is cancelled by the cancellation signal to reduce a peak value of the time domain data signal.
  • a second possible implementation manner of the first aspect after the step of canceling a peak of the time domain data signal by using the cancellation signal to reduce a peak value of the time domain data signal, Including: if the peak value of the time domain data signal after the cancellation exceeds the preset threshold, linearly scaling the time domain base signal again, and again linearly scaling the time domain base signal as Offsetting the signal; using the re-cancellation signal to cancel the at least one peak of the time domain data signal again to reduce the peak value of the time domain data signal again.
  • the method further includes: transmitting the offset time domain data signal to a power amplifier; and receiving the offset time domain data from the power amplifier a signal; compensating or filtering the offset time domain data signal from the power amplifier to cancel or reduce energy associated with the time domain based signal.
  • the in-band carrier when the predetermined carrier is an in-band carrier, the in-band carrier simultaneously carries a frequency domain data signal and a frequency domain base signal for peak cancellation.
  • the peak value of the time domain data signal is an absolute amplitude value or an energy value.
  • the present invention provides an apparatus for reducing a peak-to-average ratio, the apparatus comprising: a search module and a cancellation module; the search module is configured to search for a peak of a time domain data signal; and the cancellation module is configured to search When at least one peak of the peak of the time domain data signal exceeds a preset threshold, canceling the at least one peak of the time domain data signal according to a pre-generated time domain base signal to reduce the A peak of a time domain data signal, wherein the time domain based signal is a time domain signal generated using a predetermined carrier, the predetermined carrier being an outband carrier and/or an inband carrier.
  • the cancellation module includes: a shifting unit, a scaling unit, and a canceling unit; the shifting unit is configured to search for a peak of the time domain data signal The wave of the pre-generated time domain based signal is present when at least one wave peak exceeds a preset threshold Shifting a peak to a peak position corresponding to the at least one peak-to-peak peak of the time domain data signal, or shifting a peak of the time domain data signal to the at least one of the pre-generated time domain based signal a peak position corresponding to the peak wave peak; the scaling unit is configured to linearly scale the time domain base signal, and use the linearly scaled time domain base signal as a cancellation signal; the canceling unit is configured to utilize the offset The signal cancels the at least one peak of the time domain data signal to reduce a peak value of the time domain data signal.
  • the scaling unit is further configured to: when the peak value of the offset time domain data signal exceeds the preset threshold, the time domain base signal Performing linear scaling again, using the time-domain-based signal that is linearly scaled again as a cancellation signal; the canceling unit is further configured to perform, by using the re-cancellation signal, the at least one peak value of the time domain data signal The cancellation process is again cancelled to again reduce the peak value of the time domain data signal.
  • the device further includes: a sending module, a receiving module, and a compensation or filtering module; the sending module is configured to send the canceled time domain data signal to the power
  • the receiving module is configured to receive the offset time domain data signal from the power amplifier; the compensation or filtering module is configured to perform the canceled time domain data signal from the power amplifier A compensation or filtering operation to cancel or reduce the energy associated with the time domain based signal.
  • the in-band carrier when the predetermined carrier is an in-band carrier, the in-band carrier simultaneously carries a frequency domain data signal and a frequency domain base signal for peak cancellation.
  • the peak value of the time domain data signal is an absolute amplitude value or an energy value.
  • the present invention provides another apparatus for reducing a peak-to-average ratio, the apparatus comprising: a searcher, a processor, a memory coupled to the processor; the memory for storing a preset threshold; the searching The device is configured to search for a peak of the time domain data signal, and store the searched peak of the time domain data signal in the memory; the processor is configured to invoke a peak of the time domain data signal stored in the memory Determining a threshold and a pre-generated time domain base signal, and determining whether at least one peak value in the peak of the time domain data signal exceeds a preset threshold, and exists in a peak of the searched time domain data signal When the at least one peak value exceeds the preset threshold, the at least one peak of the time domain data signal is cancelled according to the pre-generated time domain base signal to reduce the peak value of the time domain data signal, where
  • the time domain based signal is a time domain signal generated using a predetermined carrier, the predetermined carrier being an outband carrier and/or an inband carrier.
  • the processor is specifically configured to: when the at least one peak of the peak of the searched time domain data signal exceeds a preset threshold, the pre-generated The peak of the time domain based signal is shifted to a peak position corresponding to the at least one peak peak of the time domain data signal, or the peak of the time domain data signal is shifted to the pre-generated time domain basis a peak position corresponding to the at least one peak peak of the signal; linearly scaling the time domain based signal, using the linearly scaled time domain based signal as a cancellation signal; using the cancellation signal to the time domain The at least one peak of the data signal is cancelled to reduce the peak value of the time domain data signal.
  • the processor is further configured to: when the peak value of the offset time domain data signal exceeds the preset threshold, the time domain base signal Performing linear scaling again, using the time domain base signal that is linearly scaled again as a cancellation signal; using the re-cancellation signal to cancel the at least one peak value of the time domain data signal again to reduce again The peak value of the time domain data signal.
  • the device further includes: a transmitter and a receiver; the transmitter is configured to send the offset time domain data signal to a power amplifier; Receiving the offsetted time domain data signal from the power amplifier; the processor is further configured to compensate or filter the offset time domain data signal from the power amplifier to cancel or The energy associated with the time domain based signal is reduced.
  • the in-band carrier when the predetermined carrier is an in-band carrier, the in-band carrier simultaneously carries a frequency domain data signal and a frequency domain base signal for peak cancellation.
  • the peak value of the time domain data signal is an absolute amplitude value or an energy value.
  • the present invention searches for a peak in the time domain data signal; if at least one peak in the peak of the time domain data signal exceeds a preset threshold, according to the pre-generated The time domain based signal cancels the at least one peak of the time domain data signal to reduce a peak value of the time domain data signal, wherein the time domain based signal is a time domain signal generated using a predetermined carrier, and the predetermined carrier is a band External carrier and / or in-band carrier. Since the time domain based signal is a time domain signal generated using a predetermined carrier, the predetermined carrier, whether it is an outband carrier or an inband carrier, does not reduce the number of carriers transmitting the data signal. In this way, the PAR can be reduced without affecting The data rate and performance of the system.
  • FIG. 1 is a schematic diagram of a connection relationship of a DSL system in the prior art
  • FIG. 2 is a schematic diagram of input and output characteristic curves of a nonlinear power amplifier
  • FIG. 3 is a flow chart of an embodiment of a method for reducing a peak-to-average ratio of the present invention
  • Figure 4 is a block diagram of a DSL transmission link system
  • FIG. 5 is a schematic diagram of a CCDF curve of a complementary cumulative distribution function of each module corresponding to PAR in a DSL transmission link;
  • FIG. 6 is a flow chart of another embodiment of a method for reducing a peak-to-average ratio of the present invention.
  • FIG. 7 is a flow chart of still another embodiment of a method for reducing a peak-to-average ratio of the present invention.
  • FIG. 8 is a flow chart of still another embodiment of a method for reducing a peak-to-average ratio of the present invention.
  • Figure 9 is a schematic block diagram of a specific embodiment of the method of the present invention.
  • FIG. 10 is a schematic diagram showing changes of corresponding frequency domain signals and time domain signals of FIG. 9;
  • Figure 11 is a schematic block diagram of another specific embodiment of the method of the present invention.
  • FIG. 12 is a schematic diagram showing changes of corresponding frequency domain signals and time domain signals of FIG. 11;
  • FIG. 13 is a schematic structural view of an embodiment of a device for reducing a peak-to-average ratio according to the present invention.
  • FIG. 14 is a schematic structural view of another embodiment of a device for reducing a peak-to-average ratio according to the present invention.
  • FIG. 15 is a schematic structural view of still another embodiment of the apparatus for reducing a peak-to-average ratio according to the present invention.
  • Figure 16 is a schematic view showing the structure of a device for reducing the peak-to-average ratio of the present invention.
  • Figure 17 is a schematic view showing the structure of another physical device of the apparatus for reducing the peak-to-average ratio of the present invention.
  • DSL technology is a high-speed transmission technology for data transmission through a telephone line, that is, Unshielded Twist Pair (UTP), including Asymmetrical Digital Subscriber Line (ADSL).
  • High-speed digital subscriber line Very-high-bit-rate Digital Subscriber Line, VDSL
  • Very high-speed digital subscriber line 2 VDSL2
  • single-line high-speed digital subscribers Single-pair High-bit-rate Digital Subscriber Line (English abbreviation SHDSL).
  • DSL with passband transmission uses Frequency Division Duplexing (FDD) technology to make DSL and the traditional telephone service (Plain Old Telephone Service, English abbreviation POTS) coexist on the same pair of twisted pairs.
  • FDD Frequency Division Duplexing
  • POTS Personal Telephone Service
  • DSL occupies a high frequency band
  • POTS occupies a baseband portion below 4 kHz
  • POTS signals and DSL signals are separated or combined by a splitter/integrator (Splitter).
  • the passband transmission xDSL uses Discrete Multi-Tone (English abbreviated DMT) modulation technology for modulation and demodulation.
  • DSL Access Multiplexer DSL abbreviation in English
  • the client-side xDSL transceiver 120 includes a client-side transceiver unit 121 and a split/consolidator 122.
  • the client-side transceiver unit 121 receives the DSL signal from the computer 110 and amplifies the received signal, and processes the processed signal.
  • the DSL signal is sent to the split/integrator 122; the split/integrator 122 integrates the DSL signal from the client transceiver unit 121 and the POTS signal of the telephone terminal 130; the integrated signal is transmitted through the multi-channel UTP 140.
  • the split/integrator 151 in the end xDSL transceiver 150 receives; the split/integrator 151 separates the received signals and sends the POTS signals to the Public Switched Telephone Network (PSTN) 160.
  • PSTN Public Switched Telephone Network
  • the DSL signal is sent to the central office transceiver unit 152 of the central office xDSL transceiver 150, and the central office transceiver unit 152 amplifies the received signal and sends it to the network management system (Network Management System, NMS). 170.
  • NMS Network Management System
  • VDSL2 is currently the fastest xDSL technology.
  • VDSL2 can provide uplink and downlink symmetry rates of up to 100 Mbps, but it will be affected by far end crosstalk (Far End Cross-Talk, English abbreviated FEXT) and high frequency attenuation of signals. Therefore, it is expected that there may be a relatively large problem in the actual deployment process, and few users can obtain 100 Mbps broadband service.
  • FEXT far end crosstalk
  • FEXT English abbreviated FEXT
  • FDM Frequency Division Multiplexing
  • OFDM Orthogonal Frequency Division Multiplexing
  • the peak-to-average ratio is defined as:
  • x n represents a time domain data signal.
  • FIG. 2 is a schematic diagram of the input and output characteristic curves of the nonlinear power amplifier.
  • the horizontal axis is the input power
  • the vertical axis is the output power
  • P i-AV is the average power of the input signal
  • P i-max is the maximum peak power of the input signal
  • P i-sat is the input saturation point of the power amplifier
  • P o-AV indicates the average power of the output signal
  • P o-max indicates the maximum peak power of the output signal
  • P o-sat indicates the output saturation point of the power amplifier
  • the first two-way arrow indicates the input PAR
  • the second two-way arrow Indicates the output PAR.
  • the double-headed arrow at the 3rd position indicates the input backoff (IBO), the double-headed arrow at the 4th indicates the output backoff (English abbreviated OBO), and the double-headed arrow at the 5th indicates the power.
  • Power backoff (English abbreviation PBO).
  • the nonlinear portion of the power amplifier produces nonlinear distortion for signals with large instantaneous signal power values.
  • the present invention cancels the at least one peak of the time domain data signal according to the pre-generated time domain base signal to reduce the time The peak value of the domain data signal.
  • the time domain based signal is a time domain signal generated using a predetermined carrier
  • the predetermined carrier is an outband carrier and/or an inband carrier, and therefore does not affect the performance of the inband carrier transmitting data signal, nor affects the system data rate and performance. .
  • FIG. 3 is a flowchart of an embodiment of a method for reducing a peak-to-average ratio according to the present invention, including:
  • Step S101 Search for the peak of the time domain data signal.
  • FIG. 4 is a block diagram of a DSL transmission link system.
  • the modules on the transmitting side are a mapping module 210, a normalization module 220, an Inverse Fast Fourier Transform (IFFT) 230, a windowing module 240, an interpolation module 250, and a DAC 260, respectively, from left to right.
  • Programming increase Amplifier 270 (Programmable Gain Amplifier, English abbreviation PGA), line driver (also known as line amplifier) 280 (Line driver, English abbreviated LD).
  • the signals processed by the two modules in front of the mapping module 210 and the normalization module 220 are frequency domain data signals, and the IFFT module 230 converts the frequency domain data signals into time domain data signals.
  • FIG. 5 is a schematic diagram of a complementary Cumulative Distribution Function (CCDF) curve of each module in the DSL transmission link.
  • CCDF complementary Cumulative Distribution Function
  • the four curves from left to right, 1, 2, 3, and 4 represent the CCDF curve after IFFT interpolation (1X), the CCDF curve after 2x interpolation (2X), and the CCDF after 4 times interpolation (4X).
  • IIR Infinite Impulse Response
  • the peak of the time domain data signal can be searched. From a practical point of view, it is generally after the IFFT module searches for a peak in the time domain data signal or a peak in the time domain data signal after the interpolation module.
  • Step S102 If at least one peak value of the peak of the searched time domain data signal exceeds a preset threshold, canceling at least one peak value of the time domain data signal according to the pre-generated time domain base signal to reduce The peak value of the time domain data signal, wherein the time domain based signal is a time domain signal generated using a predetermined carrier, the predetermined carrier being an outband carrier and/or an inband carrier.
  • the preset threshold is set according to the actual situation. Generally, the linear range of each device in the system needs to be considered.
  • the preset threshold may be an amplitude value, a power value, or an energy value.
  • the peak value of the time domain data signal is an absolute amplitude value or an energy value.
  • the time domain based signal is a time domain signal generated using a predetermined carrier and is used for peak cancellation, and the time domain based signal is used to cancel at least one peak of the time domain data signal to reduce the peak value of the time domain data signal. That is to say, the peak value of the time domain data signal after cancellation is lower than the peak value before the cancellation.
  • the peak value of the offset time domain data signal decreases, at least one PAR also decreases accordingly.
  • the time domain based signal can be utilized to cancel more than two peaks in the time domain data signal that exceed a preset threshold.
  • the time domain based signal can also be used to offset the time domain data signals that do not exceed the preset threshold, or the offset processing can be performed without the offset processing to maintain the original time domain data. signal.
  • the transmitted data signal is based on a certain frequency range, and the carrier in this frequency range is called an in-band carrier; the carrier outside this frequency range is called an out-of-band carrier. That is to say, the outband carrier is a carrier that is not used for data transmission, and includes a carrier in the opposite direction and a carrier on both ends. Such a carrier cannot carry data information.
  • the predetermined carrier since the time domain based signal is a time domain signal generated using a predetermined carrier, the predetermined carrier, whether it is an outband carrier or an inband carrier, does not reduce the number of carriers transmitting the data signal. In this way, the PAR can be reduced without affecting The data rate and performance of the system.
  • the predetermined carrier when the predetermined carrier is an in-band carrier, the in-band carrier simultaneously carries the frequency domain data signal and the frequency domain base signal for peak cancellation.
  • the embodiment of the present invention searches for a peak in the time domain data signal; if at least one peak value in the peak of the searched time domain data signal exceeds a preset threshold, the time domain data signal is used according to the pre-generated time domain base signal. At least one peak value is cancelled to reduce the peak value of the time domain data signal, wherein the time domain based signal is a time domain signal generated using a predetermined carrier, and the predetermined carrier is an outband carrier and/or an inband carrier. Since the time domain based signal is a time domain signal generated using a predetermined carrier, the predetermined carrier, whether it is an outband carrier or an inband carrier, does not reduce the number of carriers transmitting the data signal. In this way, the PAR can be reduced without affecting The data rate and performance of the system.
  • step S102 further includes:
  • Step S1021 If at least one peak value of the peak of the searched time domain data signal exceeds a preset threshold, shifting a peak of the pre-generated time domain base signal to the at least one peak of the time domain data signal The peak position corresponding to the peak, or shifting the peak of the time domain data signal to a peak position corresponding to the at least one peak peak of the previously generated time domain based signal.
  • Shifting the peak of the pre-generated time domain based signal to the peak position corresponding to the at least one peak peak of the time domain data signal allows the time domain based signal to accurately and effectively cancel the peak of the time domain data signal.
  • Step S1022 linearly scaling the time domain base signal, and using the linearly scaled time domain base signal as Offset the signal.
  • Step S1023 Perform cancellation processing on at least one peak of the time domain data signal by using the cancellation signal to reduce the peak value of the time domain data signal.
  • the size of the time domain base signal it is determined whether the time domain base signal is linearly amplified or linearly reduced. After linearly scaling the time domain base signal, the linearly scaled time domain base is linearly scaled.
  • the signal acts as a cancellation signal, and the cancellation signal is used to cancel at least one peak of the time domain data signal to reduce the peak value of the time domain data signal. It is further explained that steps S1021 to S1023 can perform multiple iteration operations.
  • time domain based signal is linearly amplified or reduced by positive and negative directions, in this way, the calculation is simpler and faster than in the prior art by means of an algorithm.
  • the method may further include:
  • Step S1024 If the peak value of the offset time domain data signal exceeds a preset threshold, the time domain base signal is linearly scaled again, and the linearly scaled time domain base signal is used as the cancellation signal again.
  • Step S1025 Performing again cancellation processing on at least one peak value of the time domain data signal by using the cancel signal again to reduce the peak value of the time domain data signal again.
  • the preset threshold is the maximum value of the linear range of the power amplifier, according to the actual demand, if the peak value of the offset time domain data signal still exceeds the preset threshold, the iterative operation can be continued, and the time domain base signal is linearly scaled again. The at least one peak of the time domain data signal is again cancelled by the linearly scaled again canceled signal until the peak of the cancelled time domain data signal is below a preset threshold.
  • step S102 can also be implemented by some existing algorithms, such as: iterative mode (multiple) peak cancellation, variable step mode peak cancellation, combined mode peak cancellation, multiple Time domain basis signal joint cancellation and other methods are implemented.
  • the method further includes:
  • Step S201 Send the cancelled time domain data signal to the power amplifier.
  • Step S202 Receive the offset time domain data signal from the power amplifier.
  • Step S203 Perform compensation or filtering operation on the offset time domain data signal from the power amplifier to cancel or reduce the energy of the cancellation signal associated with the time domain based signal.
  • Peak cancellation of the signal using a time domain based signal prior to requiring a low PAR power amplifier, and using an additional compensation module or filter after the device to reduce the energy correlation associated with the time domain based signal The impact of the system.
  • High PAR signals require a large linear range of power amplifiers, which increases device cost and device power consumption. By inputting a low PAR signal in such a device and then restoring the original signal, the cost reduction and power consumption can be achieved with little impact on system performance.
  • FIG. 9 is a schematic diagram of a module of a specific embodiment of the method of the present invention
  • FIG. 10 is a schematic diagram of changes of the corresponding frequency domain signal and time domain signal of FIG.
  • the peak search module 340 performs a peak search, and at least one peak in the peak of the domain data signal exceeds the pre-presence.
  • the threshold When the threshold is set, at least one peak of the time domain data signal is cancelled by linear scaling using the time domain based signal 350 generated by the outband carrier, and then the SNR 360, LD 370 is passed, and the time domain based signal is reduced by the filter 380.
  • the PSD is the power spectral density
  • the English is the Power spectral density.
  • the time domain based signal generated by the out-of-band carrier can cancel the time domain data signal well (the highest peak value is reduced in the figure). After the filtering operation, the energy of the time domain base signal is weakened or cancelled (the highest peak in the figure is recovered).
  • FIG. 11 is substantially the same as FIG. 9, FIG. 10, except that in FIG. 11, the first peak search module is after the IFFT module, and there is no interpolation module; After the DAC and LD, the compensation module reduces the influence of the time domain based signal on the system. The details are not described here. Please refer to the above description.
  • FIG. 13 is a schematic structural diagram of an apparatus for reducing a peak-to-average ratio according to an embodiment of the present invention.
  • the apparatus of this embodiment may perform the steps in the foregoing method.
  • the device includes a search module 101 and a cancellation module 102.
  • the search module 101 is used to search for peaks in the time domain data signal.
  • the canceling module 102 is configured to cancel at least one peak of the time domain data signal according to the pre-generated time domain base signal when the at least one peak of the peak of the searched time domain data signal exceeds a preset threshold, to reduce The peak value of the time domain data signal, wherein the time domain based signal is a time domain signal generated using a predetermined carrier, the predetermined carrier being an outband carrier and/or an inband carrier.
  • the in-band carrier when the predetermined carrier is an in-band carrier, the in-band carrier simultaneously carries the frequency domain data signal and the frequency domain base signal for peak cancellation.
  • the peak value of the time domain data signal is an absolute amplitude value or an energy value.
  • the embodiment of the present invention searches for a peak in the time domain data signal; if at least one peak of the peak of the searched time domain data signal exceeds a preset threshold, the timing is based on the pre-generated time domain base signal At least one peak of the domain data signal is cancelled to reduce the peak value of the time domain data signal, wherein the time domain based signal is a time domain signal generated using a predetermined carrier, and the predetermined carrier is an outband carrier and/or an inband carrier . Since the time domain based signal is a time domain signal generated using a predetermined carrier, the predetermined carrier, whether it is an outband carrier or an inband carrier, does not reduce the number of carriers transmitting the data signal. In this way, the PAR can be reduced without affecting The data rate and performance of the system.
  • the cancellation module 102 includes a shifting unit 1021, a scaling unit 1022, and a cancellation unit 1023.
  • the shifting unit 1021 is configured to shift a peak of the pre-generated time domain base signal to the at least one of the time domain data signals when at least one peak value of the peak of the searched time domain data signal exceeds a preset threshold The peak position corresponding to the peak wave peak or the peak of the time domain data signal is shifted to a peak position corresponding to the at least one peak peak of the previously generated time domain base signal.
  • the time domain based signal can be accurately and efficiently canceled out the peak of the time domain data signal.
  • the scaling unit 1022 is configured to linearly scale the time domain based signal, and use the linearly scaled time domain based signal as a cancellation signal.
  • the canceling unit 1023 is configured to cancel the at least one peak of the time domain data signal by using the cancellation signal to reduce the peak value of the time domain data signal.
  • the scaling unit 1022 is further configured to linearly scale the time domain base signal again when the peak value of the time domain data signal after the cancellation exceeds the preset threshold, and use the time domain base signal that is linearly scaled again as the cancellation signal again.
  • the canceling unit 1023 is further configured to perform a cancel-off processing on the at least one peak of the time-domain data signal by using the cancel-off signal again to reduce the peak value of the time-domain data signal again.
  • the apparatus further includes: a transmitting module 201, a receiving module 202, and a compensation or filtering module 203.
  • the transmitting module 201 is configured to send the offset time domain data signal to the power amplifier.
  • the receiving module 202 is configured to receive the offset time domain data signal from the power amplifier.
  • the compensation or filtering module 203 is operative to compensate or filter the offset time domain data signal from the power amplifier to cancel or reduce the energy associated with the time domain based signal.
  • FIG. 16 is a schematic structural diagram of a device for reducing a peak-to-average ratio according to the present invention.
  • the device in this embodiment may perform the steps in the foregoing method.
  • the apparatus includes a searcher 11, a processor 12, and a memory 13 coupled to the processor 12.
  • the memory 13 is used to store a preset threshold.
  • the searcher 11 is used to search for peaks in the time domain data signal and store the peaks in the searched time domain data signals in the memory 13.
  • the processor 12 is configured to call a peak in the time domain data signal stored in the memory 13, a preset threshold, and a pre-generated time domain base signal for peak cancellation, and determine whether at least one of the peaks of the time domain data signal exists.
  • the peak value of the wave exceeds a preset threshold, and when at least one peak of the peak of the searched time domain data signal exceeds a preset threshold, at least one peak of the time domain data signal is cancelled according to the pre-generated time domain base signal,
  • the time domain based signal is a time domain signal generated using a predetermined carrier, the predetermined carrier being an outband carrier and/or an inband carrier.
  • the peak value of the time domain data signal is an absolute amplitude value or an energy value.
  • the embodiment of the present invention searches for a peak in the time domain data signal; if at least one peak value in the peak of the time domain data signal exceeds a preset threshold, at least one wave of the time domain data signal is generated according to the pre-generated time domain base signal
  • the peak performs cancellation processing to reduce the peak value of the time domain data signal, wherein the time domain based signal is a time domain signal generated using a predetermined carrier, and the predetermined carrier is an outband carrier and/or an inband carrier. Since the time domain based signal is a time domain signal generated using a predetermined carrier, the predetermined carrier, whether it is an outband carrier or an inband carrier, does not reduce the number of carriers transmitting the data signal. In this way, the PAR can be reduced without affecting The data rate and performance of the system.
  • the processor 12 is specifically configured to: when the at least one peak value of the peak of the searched time domain data signal exceeds a preset threshold, shift the peak of the pre-generated time domain base signal to the time domain data signal. a peak position corresponding to at least one peak wave peak, or shifting a peak of the time domain data signal to a peak position corresponding to the at least one peak peak of the pre-generated time domain base signal; linearly scaling the time domain base signal, The linearly scaled time domain base signal is used as a cancellation signal; the cancellation signal is used to cancel at least one peak of the time domain data signal to reduce the peak value of the time domain data signal.
  • the processor 12 is further configured to linearly scale the time domain base signal again when the peak value of the offset time domain data signal exceeds a preset threshold, and offset the linearly scaled base time base signal again. Signal; again canceling the signal to cancel at least one peak of the time domain data signal to cancel the peak value of the time domain data signal again.
  • the apparatus further includes: a transmitter 14 and a receiver 15.
  • the transmitter 14 is configured to send the offset time domain data signal to the power amplifier
  • the receiver 15 is configured to receive the offset time domain data signal from the power amplifier
  • the processor 12 is further configured to compensate or filter the offset time domain data signal from the power amplifier Wave operation to cancel or reduce the energy associated with the time domain based signal.
  • the in-band carrier when the predetermined carrier is an in-band carrier, the in-band carrier simultaneously carries the frequency domain data signal and the frequency domain base signal for peak cancellation.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device implementations 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. Combinations can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the 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 which is essential or contributes 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.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods of the various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Amplifiers (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour réduire un rapport valeur de crête sur valeur moyenne (PAR). Le procédé comprend les étapes consistant à : rechercher une crête d'onde d'un signal de données de domaine temporel; si la crête d'onde trouvée du signal de données de domaine temporel présente au moins une valeur de pic d'onde dépassant un seuil prédéfini, effectuer, selon un signal à base de domaine temporel pré-généré, un traitement d'annulation sur ladite au moins une valeur de crête d'onde du signal de données de domaine temporel afin de réduire la valeur de crête d'onde du signal de données de domaine temporel, le signal à base de domaine temporel étant un signal de domaine temporel créé au moyen d'une porteuse prédéterminée, et la porteuse prédéterminée est une porteuse hors-bande et/ou une porteuse intra-bande. L'utilisation du procédé ci-dessus peut réduire un PAR sans affecter un débit de données et les performances d'un système.
PCT/CN2015/085388 2015-07-29 2015-07-29 Procédé et dispositif pour réduire le rapport valeur de crête sur valeur moyenne (par) Ceased WO2017015888A1 (fr)

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CN201580076783.4A CN107251502B (zh) 2015-07-29 2015-07-29 降低峰均比的方法及装置

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