A NOVEL PAPR REDUCTION WITH TRELLIS SHAPING FOR NC-OFDM IN COGNITIVE RADIO  

作　　者：Shao Fei Yu Yong Zhang Shijie Sun Dechun 

机构地区：[1]The School of Telecommunications Engineering, Xidian University, Xi＇ an 710071, China [2]Institute of Communications Engineering, PLA University of Science and Technology, Nanjing 210007, China [3]School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China

出　　处：《Journal of Electronics(China)》2009年第3期296-302,共7页电子科学学刊（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No.60832008);National Basic Research Program of China (973 Program, No.2009CB320403)

摘　　要：In this paper, trellis shaping is applied to reducing the Peak-to-Average Power Ratio(PAPR) of NC-OFDM signals due to the fact that the total number of active subcarriers and their locations might change continuously in a dynamic spectrum access network.A new branch metric of trellis shaping is proposed which reduces the PAPR of OFDM signals through minimizing the variance of the power by VA decoder.The overall performance considerably depends on the type of signal mapping, and therefore a new type of 64QAM mapping method is designed.Simulation results show that this scheme significantly reduces the PAPR.Finally, a significant phenomenon is demonstrated that the PAPR of NC-OFDM signals in which the deactivated carriers is distributed in the Bernoulli distribution has better performance than that of OFDM signals.In this paper, trellis shaping is applied to reducing the Peak-to-Average Power Ratio （PAPR） of NC-OFDM signals due to the fact that the total number of active subcarriers and their locations might change continuously in a dynamic spectrum access network. A new branch metric of trellis shaping is proposed which reduces the PAPR of OFDM signals through minimizing the variance of the power by VA decoder. The overall performance considerably depends on the type of signal mapping, and therefore a new type of 64QAM mapping method is designed. Simulation results show that this scheme significantly reduces the PAPR. Finally, a significant phenomenon is demonstrated that the PAPR of NC-OFDM signals in which the deactivated carriers is distributed in the Bernoulli distribution has better performance than that of OFDM signals.

关 键 词：Peak-to-Average Power Ratio （PAPR） NC-OFDM Trellis shaping Cognitive radio 

分 类 号：TN911.3[电子电信—通信与信息系统] TN929.5[电子电信—信息与通信工程]