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WO2007009361A1 - Procédé et système empêchant tout rapport de puissance pic/moyenne dans un système de multiplexage à division de fréquence orthogonale - Google Patents

Procédé et système empêchant tout rapport de puissance pic/moyenne dans un système de multiplexage à division de fréquence orthogonale Download PDF

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Publication number
WO2007009361A1
WO2007009361A1 PCT/CN2006/001683 CN2006001683W WO2007009361A1 WO 2007009361 A1 WO2007009361 A1 WO 2007009361A1 CN 2006001683 W CN2006001683 W CN 2006001683W WO 2007009361 A1 WO2007009361 A1 WO 2007009361A1
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WO
WIPO (PCT)
Prior art keywords
data
peak
suppressing
idft
module
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Ceased
Application number
PCT/CN2006/001683
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English (en)
Chinese (zh)
Inventor
Guoxin Zhang
Huiming Chen
Bo Hong
Tengfei Zhao
Xin'an Wang
Gaofa Xiao
Yi Wang
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of WO2007009361A1 publication Critical patent/WO2007009361A1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/2623—Reduction thereof by clipping
    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70706—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with means for reducing the peak-to-average power ratio

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and system for suppressing peak power of a signal and reducing a peak-to-peak ratio in an orthogonal frequency division multiplexing communication system. . Background technique
  • Orthogonal Frequency Division Multiplexing is a modulation method with high channel utilization. It has good anti-fading performance and can realize parallel transmission of data. With the rapid development of digital signal processing technology and With the widespread use of large-scale integrated circuits, OFDM has received increasing attention, especially in the field of high-speed digital communications.
  • a plurality of carriers having a synchronization relationship in frequency are used to modulate a signal. Since the envelope values of the carriers are statistically independent, the ratio of the peak value to the average power ratio of the superimposed signals increases as the number of carriers increases. The value of the Peak-to-Average power ratio (PAPR) is large. Therefore, the dynamic range of the modulated signal is quite large, which requires the power amplifier in the system to have a high linear dynamic range to avoid spectral spread and nonlinear distortion of the transmitted signal. At the same time, the subsequent D/A converter is required to have a large conversion bandwidth, which increases the cost and implementation difficulty of the system.
  • PAPR Peak-to-Average power ratio
  • the method of block coding the input data of OFDM can reduce the independence of the signals of the multiplexer, thereby reducing the probability of superposition of the peak-to-peak value of the signal, thereby reducing the PAPR; or using a partial transmission sequence to reduce the superposition time.
  • the number of signals, thereby reducing the PAPR there is also a way to select the mapping, that is, through mapping, to generate all possible combinations of the streams, and then select a combination scheme, so that the PAPR of the signals superimposed by the IFFT transform The smallest.
  • this type of method requires a large amount of computation.
  • the other type is to process the signal after the OFDM multiplexer.
  • the most direct and effective way is to limit the analog signal.
  • clipping is a nonlinear process that causes severe in-band and out-of-band noise, which reduces the bit error rate performance and spectral efficiency of the overall system.
  • An existing method of processing a signal after an OFDM multiplexer is: Ochiai, H., Imai, H. Performance analysis of deliberately clipped OFDM signals (Communication, IEEE Transactions on , Volume: 50 , Issue: 1 , Jan. 2002 Pages: 89 101 )
  • a method of reducing the PAPR by oversampling and limiting filtering The structure is shown in Figure 1.
  • the input signal is filled with zeros at the end of the signal, and then the discrete Fourier transform of the JN point is performed.
  • IDFT Inverse Discrete Fourier Transform
  • J is an oversampling factor
  • DFT discrete Fourier transform
  • the Fourier Transform module performs a J-point DFT transform. After the data is restored, the out-of-band noise is removed and N data is converted into an N-point IDFT transform, and the PAPR of the output data is improved.
  • An object of the present invention is to provide a peak-to-average ratio suppression method and system for limiting filtering which can greatly improve the PAPR value of a signal.
  • a method for suppressing a peak-to-average ratio in an orthogonal frequency division multiplexing system includes: The input data is oversampled and subjected to discrete Fourier transform IDFT transform; the oversampled and IDFT transformed data is amplified by nl times and subjected to clipping; the sliced data is subjected to discrete Fourier transform DFT transform, and the strip is removed External noise; IDFT transform is performed on the data after removing the out-of-band noise, and is sorted and output.
  • the data after removing the out-of-band noise is performed on the signal in the output module.
  • magnification nl and the reduction factor n3 are equal.
  • the data is amplified by n2 times before the data is output.
  • the limiting operation in the limiting is performed according to the following steps:
  • a preferred range of the maximum value of the signal amplitude of 4 nax is 60 to 80.
  • a system for suppressing a peak-to-peak ratio in an orthogonal frequency division multiplexing system comprising the following sequenced data processing modules:
  • An oversampling module oversampling the input data and performing an inverse discrete Fourier transform IDFT
  • the limiting module amplifies the transformed oversampled data by nl times and performs clipping; the denoising module performs discrete Fourier transform DFT transform on the data after clipping to remove out-of-band noise;
  • the output module performs IDFT transformation on the data after the out-of-band noise is removed, and performs processing and output.
  • the denoising module reduces the data after removing the out-of-band noise by n3 times and then supplies the data to the output module; or
  • the output module performs IDFT conversion on the signal from the output module for the data from the denoising module. Reduced by n3 times before.
  • magnification nl and the reduction factor are equal.
  • the output module amplifies the data by n2 times and outputs the data.
  • the limiting module performs limiting operation by the following steps:
  • the preferred range of the maximum value ax of the limiting signal amplitude of the limiting module is 60 to 80.
  • the method and system for suppressing the peak-to-peak ratio in the orthogonal frequency division multiplexing system amplifies the data before the limiting operation on the input data, the parameter is nl; after the JN point DFT transform After that, the data is restored, and the parameter is l/nl, so that the average power is increased, so that the data bit width is more effectively utilized and the bit error rate is reduced; the peak value in the limiter is the value set by the simulation, and the limit is limited.
  • the range of magnitude is the component (real and imaginary), and the balance is chosen between the bit error rate and the PAPR suppression effect.
  • Figure 1 is a schematic block diagram of the sample-like limiting filter
  • FIG. 3 is a functional block diagram of an embodiment in accordance with the present invention.
  • the invention provides an achievable method and system for suppressing the peak-to-level ratio based on oversampling and limiting filtering.
  • the basic idea is: for each transform unit, the input signal is filled with zeros to obtain JN data, and then JN is performed.
  • the discrete Fourier transform IDFT transform of the point J is the oversampling factor
  • the output data is amplified according to the simulation result by a certain multiple
  • the amplification factor is nl
  • the output data is directly sent to the discrete Fourier transform DFT module for JN point DFT transformation, and the output data is removed from the out-of-band noise, then reduced to N data, then N-point IDFT transform, and then amplified by n2 times.
  • the PAPR of the data is significantly improved over the original PAPR.
  • Oversampling module Oversampling the input data and performing JN point IDFT transformation
  • the sampling points are independent of each other, and it is easy to introduce the statistical characteristics of the signal PAPR at this time.
  • the theoretical formula has become the theoretical basis of many PAPR suppression methods. The results show that when the discrete signal is restored to continuous signal by D/A, PAPR rebound phenomenon occurs, especially the discrete signal obtained by Nyquist sampling frequency, PAPR rebound is the most serious. Therefore, the effect of PAPR suppression using the sputum-like signal will be more obvious.
  • some 0 information (that is, too) is added to the original data stream, and 0 information can be added between each adjacent valid data, or after the data is concentrated, and the ID point of the J point is performed.
  • Transform The following is an example of adding 0 information after the data is concentrated.
  • the transmitted signal After sampling, modulation, and phase shifting, the transmitted signal becomes:
  • Limiter module Performs a clipping operation after amplifying the oversampled data after the transformation. As mentioned earlier, if you directly limit the data, you will find that to obtain a lower PAPR, the utilization of the bit width is lower, and most of the transformed data is destroyed due to the small clipping value. Conventional receiving circuits will generate severe errors, so the data needs to be processed accordingly.
  • the data is amplified to increase the average power, so that the limit value can be appropriately increased to obtain a better PAPR suppression effect.
  • the limiting object is the output value. Department and imaginary department.
  • Amplifying the signal after the JN point IDFT by nl times can increase the Pin value of the signal, thereby reducing the clipping rate ⁇ value, thereby effectively reducing the PAPR value. Therefore, from the viewpoint of lowering the PAPR value, it is desirable that the larger the value of nl, the better.
  • the principle of A max value selection is to ensure that most of the data will not be lost after the limiting operation, which is beneficial to the correct transmission of data, so it is desirable that the value of nl is as small as possible. Based on the above factors, it can be seen that the selection of nl values is contradictory, so in practical applications, a compromise solution is needed.
  • Denoising module After the clipped data is subjected to J-point DFT transform, the out-of-band noise is removed, and then the multiple is reduced by n3 times, and more preferably, n3 is equal to nl.
  • the general PAPL limiting filtering method is a nonlinear process that introduces severe out-of-band noise, which reduces the bit error rate performance and spectral efficiency of the overall system.
  • the J-point data sequence that produces distortion is:
  • the sequence of length N after the original data is distorted is:
  • Output module Perform OFDM modulation (N-point IDFT) on the data and appropriately amplify the output data, and sort the IDFT-transformed data and output it in the port matching format.
  • N-point IDFT OFDM modulation
  • the sequence uses the N-point IDFT for ordinary OFDM modulation and then amplifies the n2 output.
  • the purpose of multiplying the final output data by a factor ⁇ 2 is to ensure maximum utilization of the data range.
  • the technical solutions of the present invention are further described below by way of specific embodiments.
  • the embodiment is a wireless local area network 802.11a protocol system to which the present invention is applied, which uses a 64QAM modulation scheme.
  • the data bit width is 8 bits
  • the over-sampling factor J 2
  • the effect of the method provided by the present invention is measured by a curve of a probability that the peak-to-peak ratio exceeds a certain threshold z (CCDF)-PAPR value.
  • CCDF threshold z
  • the fourth group of parameters is suppressed.
  • PAPR has the best effect, but its bit error rate is high and cannot be recovered.
  • the first group's PAPR suppression effect is worse than the third group, the received 64QAM constellation effect is significantly better than the third group. Therefore, the first group of parameters is used as Preferred parameter combinations. The simulation results are shown in Figure 4.
  • each processing unit becomes 64 data.
  • the data is OFDM-modulated (N-point IDFT) and appropriately amplified, and the IDFT-converted data is collated and output in a port-matching format.
  • Each 64 data from which the out-of-band noise is removed is subjected to 64-point IDFT conversion, and the data is output after being amplified by 4 times.
  • the system peak-to-peak ratio of the PAPR-free process is about lldb, and the PAPR is reduced to about 7 db after the above method, as shown in Fig. 4, which is a simulation effect according to the present invention.
  • the ordinate is the probability that the peak-to-level ratio exceeds a certain threshold z (CCDF), and the abscissa is the PAPR value.
  • CCDF threshold z
  • the present invention can effectively suppress PAPR, and the receiving circuit does not require specific requirements and is easy to implement.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Noise Elimination (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

L’invention concerne un procédé et un système empêchant tout rapport de puissance pic/moyenne dans un système de multiplexage à division de fréquence orthogonale, consistant à prélever un suréchantillon des données saisies et mettre en œuvre une Transformée de Fourier discrète inverse (IDFT) ; à amplifier lesdites données de suréchantillon et les données IDFT, et à prendre une limite d’amplitude ; à prendre la transformée DFT pour les données limitées et à retirer le bruit hors bande ; à prendre la transformée IDFT pour le bruit hors bande retiré des données, avant de les collationner et de les générer. En conséquence, l’invention concerne un système empêchant tout rapport de puissance pic/moyenne. La présente invention peut empêcher tout phénomène PAPP de manière efficace, augmenter la puissance moyenne, mieux utiliser la largeur de bits de données et réduire la fréquence de code d’erreur.
PCT/CN2006/001683 2005-07-15 2006-07-14 Procédé et système empêchant tout rapport de puissance pic/moyenne dans un système de multiplexage à division de fréquence orthogonale Ceased WO2007009361A1 (fr)

Applications Claiming Priority (2)

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CN200510035943.9 2005-07-15
CNB2005100359439A CN100502378C (zh) 2005-07-15 2005-07-15 正交频分复用系统中抑制峰平比的电路和方法

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CN104243379A (zh) * 2013-06-08 2014-12-24 华为技术有限公司 无线通信系统中ofdm信号峰值功率的抑制方法及发射机
US11571531B2 (en) 2005-02-23 2023-02-07 OptiNose Inc. Powder delivery devices

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JP5092580B2 (ja) * 2007-06-26 2012-12-05 ソニー株式会社 デジタル信号処理装置、デジタル信号処理方法及びデジタル信号処理プログラム
JP5010399B2 (ja) * 2007-08-29 2012-08-29 株式会社日立国際電気 直交多重信号のピーク抑圧方法、ピーク抑圧回路、及び送信装置
CN101399792B (zh) * 2007-09-29 2011-05-04 京信通信系统（中国）有限公司 用于降低发射信号峰均比的削峰装置及其方法
WO2010006469A1 (fr) * 2008-07-18 2010-01-21 上海贝尔阿尔卡特股份有限公司 Procédés et dispositifs destinés au traitement de commutation pour des signaux de sous-canaux multiples dans un système sc-fdma
CN101662450B (zh) * 2009-09-17 2012-03-07 京信通信系统（中国）有限公司 查表自适应削峰方法
CN101656704B (zh) * 2009-09-18 2013-02-06 广州杰赛科技股份有限公司 降低ofdm信号峰均比的方法和装置
CN101917378B (zh) * 2010-08-10 2012-08-15 华中科技大学 一种降低ofdm信号峰均功率比的方法
WO2013063440A1 (fr) * 2011-10-27 2013-05-02 Lsi Corporation Processeur vectoriel à ensemble d'instructions comprenant fonction de convolution vectorielle pour filtrage fir
CN102957659B (zh) * 2012-11-14 2014-12-31 西南石油大学 一种降低ofdm系统峰均比的自适应限幅方法
CN103051582B (zh) * 2013-01-08 2015-02-25 西南石油大学 一种低计算复杂度的自适应带内处理约束限幅方法
US9847897B1 (en) * 2016-12-13 2017-12-19 Futurewei Technologies, Inc. System and method for DFT-S-OFDM PAPR reduction

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EP1469649A1 (fr) * 2003-04-17 2004-10-20 University Of Southampton Procèdè et dispositif pour la réduction du rapport entre puissance de crête et puissance moyenne

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US11571531B2 (en) 2005-02-23 2023-02-07 OptiNose Inc. Powder delivery devices
CN104243379A (zh) * 2013-06-08 2014-12-24 华为技术有限公司 无线通信系统中ofdm信号峰值功率的抑制方法及发射机

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CN100502378C (zh) 2009-06-17

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