OFDM系统中降低峰均功率比算法的研究  

Research on PAPR Reduction Algorithm for OFDM System

作　　者：扈鹏[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2012年第7期55-58,共4页Radio Engineering

摘　　要：正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统中,峰均功率比(Peak to AveragePower Ratio,PAPR)过高会导致收发器的非线性失真,严重影响系统的性能。传统的部分传输序列(Partial TransmitSequence,PTS)算法能够有效地降低PAPR,然而其计算复杂度随着分块数目增长呈指数增加。在研究PTS的基础上提出了双重迭代PTS算法,该算法利用增加迭代次数,并且每次迭代时选择不同的相位旋转因子集合来优化OFDM系统的峰均比性能。该算法在峰均比性能上优于常规OFDM系统以及普通迭代PTS算法,在降低峰均比性能和计算复杂度之间取得了较好的折衷。A high peak-to-average power ratio （PAPR） is a major shortcoming in OFDM systems,as it causes nonlinearity in the transmitter,degrading the performance of the system significantly. Partial transmit sequences （PTS） is one of the best methods in reducing PAPR,but there is a corresponding exponential increase in complexity. Double iterative PTS scheme is proposed based on the study of original PTS. By utilizing different phase rotation factor set for each iterative stage,the PAPR of OFDM system is improved. Compared with traditional schemes,the proposed scheme has a better performance and can obtain much better tradeoff between performance and complexity.

关 键 词：正交频分复用 部分传输序列 峰均比 累积互补函数 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]