Threshold-based piecewise companding transform for PAPR reduction in OFDM systems  

作　　者：LIU Shu-hua LI Yong-zhao ZHANG Hai-lin LIU Ying-ting 

机构地区：[1]Sate Key Laboratory of Integrated Service Network 119#, Xidian University [2]Information and Communication Company of Gansu Electric Power Corporation

出　　处：《The Journal of China Universities of Posts and Telecommunications》2013年第2期1-6,18,共7页中国邮电高校学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(61072069);the Fundamental Research Funds for the Central Universities(72105242);the 111 Project(B08038)

摘　　要：Piecewise companding transform is a flexible and efficient way to solve the high peak-to-average power ratio （PAPR） problem for orthogonal frequency division multiplexing （OFDM） systems. A novel threshold-based piecewise companding transform is proposed in this paper. Based on the statistical characteristics of amplitudes, OFDM signals are classified into three groups （i.e., small, average and large signals）. Different from conventional approaches, two dedicated designed thresholds are set to amplify the small signals and compress the large signals, respectively. Simulation results verify the improvement in PAPR reduction of the proposed scheme. Moreover, a lower bit error rate （BER） performance loss can be obtained by introducing the iterative detection with a moderate increase in complexity.Piecewise companding transform is a flexible and efficient way to solve the high peak-to-average power ratio （PAPR） problem for orthogonal frequency division multiplexing （OFDM） systems. A novel threshold-based piecewise companding transform is proposed in this paper. Based on the statistical characteristics of amplitudes, OFDM signals are classified into three groups （i.e., small, average and large signals）. Different from conventional approaches, two dedicated designed thresholds are set to amplify the small signals and compress the large signals, respectively. Simulation results verify the improvement in PAPR reduction of the proposed scheme. Moreover, a lower bit error rate （BER） performance loss can be obtained by introducing the iterative detection with a moderate increase in complexity.

关 键 词：OFDM PAPR companding transform iterative detection 

分 类 号：TN919.3[电子电信—通信与信息系统]