联合星座扩展的预留子载波O FDM信号峰均比抑制算法

doi:10.11959/j.issn.1000-436x.2016065

摘要/Abstract

摘要：

针对现有预留子载波TR 技术对无线OFDM信号峰均比（PAPR）抑制性能效率低，且难以同时兼顾峰均比抑制、误码率（BER）性能损失及带外频谱分量扩展的问题，提出一种联合智能梯度映射主动星座扩展ACE的预留子载波峰均比抑制ACE-TR算法，能以较低的复杂度同时对信号峰均比和接收端误码率性能进行联合优化，并在迭代过程中消除因限幅处理所导致的信号带外频谱分量再生；特别是，由于在优化迭代过程中可以对迭代参数进行自适应调整，能够有效提高算法的适用灵活性。对算法进行了全面深入的理论分析，推导了其可获得的PAPR 抑制增益理论界和接收信号误码率性能理论值。理论分析与仿真表明，ACE-TR 算法能以更快的收敛速度产生所需的削峰信号，并同时获得优异的峰均比抑制、误码率及带外功率谱性能。

关键词: 正交频分复用, 峰均比, 预留子载波, 主动星座扩展

Abstract:

To overcome the drawbacks of existing tone reservation(TR) techniques,an efficient TR algorithm combined with active constellation extension (ACE-TR) was proposed for reducing the peak-to-average power ratio (PAPR) of or-thogonal frequency division multiplexing (OFDM) signal.By means of a specially designed iterative procedure and a joint optimization approach for PAPR and bit-error-rate (BER) performances,ACE-TR was able to obtain both an im-proved BER and minimized out-of-band interference while reducing the PAPR effectively.A comprehensive theoretical analysis was presented,and some important results including the bounds of achievable PAPR gain,BER bound,and maximum iteration number were derived.Specifically,by adaptively adjusting the iterative parameters in the optimization approach,more trade-off flexibility between PAPR reduction and BER performance can be offered to satisfy various de-sign requirements.Simulations demonstrate that ACE-TR can dramatically decrease the number of required it ions to reach the desired PAPR with low computation complexity.In addition,the transmitted OFDM symbols using the pro-posed ACE-TR have less in-band distortion and lower out-of-band spectral regrowth than traditional TR algorithms.

Key words: orthogonal frequency division multiplexing, peak-to-average power ration, tone reservation, active constella-tion extension

刘芳,王勇. 联合星座扩展的预留子载波O FDM信号峰均比抑制算法[J]. 通信学报, 2016, 37(3): 175-181.

Fang LIU,Yong WANG. Tone reservation technique combined with active constellation extension for PAPR reduction of OFDM signal[J]. Journal on Communications, 2016, 37(3): 175-181.

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参考文献 15

[1]	WANG T H , YANG C , WU G , et al. OFDM and its wireless applica-tion:A survey[J]. IEEE Trans Vehicular Technology, 2009,58(4): 1673-1694.
[2]	RAHMATALLAH Y , MOHAN S . Peak-to-average power ratio reduc-tion in OFDM systems:a survey and taxonomy[J]. IEEE Commun Surveys＆ Tutorials, 2013,58(4): 1673-1694.
[3]	WANG Y , LUO Z . Optimized iterative clipping and filtering for PAPR reduction of OFDM signals[J]. IEEE Trans Commun, 2010,59(1): 33-37.
[4]	KOU Y J , LU W S , ANTONIOU A . A new peak-to-average pow-er-ratio reduction algorithm for OFDM systems via constel ation ex-tension[J]. IEEE Trans Wireless Commun, 2007,6(5): 1823-1832.
[5]	BAE K , ANDREWS J G , POWERS E J . Adaptive active constellation extension algorithm for peak-to-average ratio reduction in OFDM[J]. IEEE Commun Letters, 2010,14(1): 39-41.
[6]	KRONGOLD B S , JONES D L . An active-set approach for OFDM PAR reduction via tone reservation[J]. IEEE Trans Signal Processing, 2004,52(2): 495-509.
[7]	WANG L , TELLAMBURA C . Analysis of clipping noise and tone-reservation algorithms for peak reduction in OFDM systems[J]. IEEE Trans Vehicular Technology, 2008,57(3): 1675-1684.
[8]	PARK K , PARK I C . Low-complexity tone reservation for PAPR reduction in OFDM communication systems[J]. IEEE Trans Very Large Scale Integration (VLSI) Systems, 2012,20(10): 1919-1923.
[9]	TELLADO-MOURELO J . Peak to average power reduction for mul-ticarrier modulation[D]. Stanford University, 1999.
[10]	LI H , JIANG T , ZHOU Y . An improved tone reservation scheme w h fast convergence for PAPR reduction in OFDM systems[J]. IEEE Trans Broadcasting, 2011,57(4): 902-906.
[11]	COMBETTES P L . Convex set theoretic image recovery by xtrapo-lated iterations of parallel subgradient projections[J]. IEEE Trans Image Processing, 1997,6(4): 493-506.
[12]	KRONGOLD B S , JONES D L . PAR reduction in OFDM via active constellation extension[J]. IEEE Trans Broadcasting, 49(3): 258-268.
[13]	WANG Y , WANG L H , GE J H . An efficient nonlinear companding transform for reducing PAPR of OFDM signals[J]. IEEE T ns Broadcasting, 2012,58(4): 677-684.
[14]	BANELLI P , CACOPARDI S . Theoretical analysis and performance of OFDM signals in nonlinear AWGN channels[J]. IEEE Trans Commun, 2000,48(3): 430-441.
[15]	ETSI EN 300 744 v1.4.1,Digital video broadcasting:framing struc-ture,channel coding,and modulation for digital terrestrial televi-sion[S]. 2001.