一种降低OFDM系统PAPR的改进SLM技术  

An Improved SLM Technique to Reduce PAPR of OFDM Systems

作　　者：张振川[1] 刘江宁[1] 杨明华[1] 宋俊保[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2008年第7期972-975,共4页Journal of Northeastern University(Natural Science)

基　　金：国家高技术研究发展计划项目(2006AA701428)

摘　　要：选择映射(selected mapping,SLM)技术是一种无失真降低OFDM(orthogonal frequency divisionmultiplexing)信号峰均比PAPR(peak-to-average power ratio)的有效方法.但是普通的SLM技术因为相位序列边带信息的传输而导致了数据传输速率的损失.因此提出了一种改进的SLM技术来降低OFDM信号的PAPR,它把相位序列信息嵌入在编码后的OFDM数据块的检测符号上,避免了系统特意传输边带信息而造成的数据传输速率的损失.Matlab仿真结果表明,所提出的改进SLM技术可以在不过分增加系统复杂性的基础上,获得比普通的SLM技术更好地降低PAPR的性能.SLM（selected mapping） is an effective algorithm to reduce peak-to-average power ratio （PAPR） of OFDM （orthogonal frequency division multiplexing） signal without distortion. But the conventional SLM technique has the disadvantage of the loss of data transmission rate due to the bandside information on phase sequence. An improved SLM technique is therefore put forward to reduce PAPR of OFDM system by way of embedding the information on phase sequence in the check symbols of OFDM data block, so as to avoid the loss of data transmission rate due to intentional bandside information transmission. Matlab simulation results showed that the improved SLM technique is better than the conventional one in reducing PAPR since no undue system complexity will happen.

关 键 词：正交频分复用(OFDM) 峰均功率比(PAPR) 选择映射(SLM) 相位序列 累积分布函数 

分 类 号：TN914.66[电子电信—通信与信息系统]