降低光OFDM系统峰均比的TR-clipping算法  

TR-clipping algorithm for PAPRreduction in O-OFDM system

作　　者：张璇[1] 唐义[1] 黄刚[1] 黄河清[1] 倪国强[1] 

机构地区：[1]北京理工大学光电学院光电成像技术与系统教育部重点实验室,北京100081

出　　处：《光电子．激光》2013年第4期698-703,共6页Journal of Optoelectronics·Laser

基　　金：国家重点基础研究发展(973)计划(2013CB329202);国家高技术研究发展(863)计划(2009AA01Z225);工业技术基础(J312012B002)资助项目

摘　　要：针对光正交频分复用(O-OFDM)系统中峰值平均功率比(PAPR)过高的问题,对传统的预留子载波(TR)方法进行了改进并引入到O-OFDM系统,提出将削波与TR法相结合,以减小削波噪声对信号的影响,同时有效降低信号的PAPR。研究结果表明:本文方法计算复杂度较低,易于实现;通过合理地选取门限A与预留子载波条数W的大小,可以有效抑制削波噪声在信号带内与带外引起的畸变;在误码率BER=10-6的条件下,当削波率γ由7dB降低至2dB时,所需的光信噪比(OSNR)相比削波法降低了0.2～7dB。There exists high peak to average power ratio （PAPR） in optical orthogonal frequency division multiplexing （O-OFDM） system. Traditional tone reservation （TR） method is improved to be adapted to current O-OFDM system. A new method combining of improved TR and clipping is proposed to reduce the influence of clipping noise and decrease the PAPR of OFDM signal at the same time. The proposed method is proved to be with low computational complexity and high technical feasibility. The simulation results show that the in-band noise and out-of-band spectrum are restrained effectively with TR-clipping under a reasonable value of threshold and reserved suhcarriers number of W. For BER= 10-6 ,as dip- ping ratio decreases from 7 dB to 2 dB,the needed OSNR is reduced from 0.2 clB to 7 dB compared with the dipping method.

关 键 词：光正交频分复用(O-OFDM) 峰值平均功率比(PARR) 预留子载波(TR) 削波 

分 类 号：TN929.12[电子电信—通信与信息系统]