降低OFDM系统峰均功率比的方法  

Peak-to-average power ratio reduction method for OFDM systems

作　　者：周猛[1] 凃国 周建明[2] 

机构地区：[1]中国科学院研究生院信息科学与工程学院,北京100049 [2]中国移动通信集团公司,北京100032

出　　处：《通信学报》2008年第7期124-128,134,共6页Journal on Communications

基　　金：国家自然科学基金资助项目(60496310)~~

摘　　要：针对正交频分复用系统,提出了一种复杂度较低的降低峰均功率比的方法。该方法首先实施时域过采样,再采用功率归一化和限幅,最后对限幅后的信号进行低通滤波。此外,从信噪比和信号噪声失真比等角度分析了限幅对过采样OFDM信号的影响。仿真结果表明,与传统的限幅滤波方法对比,该方法能有效抑制滤波后系统峰均功率比的回升。A low complexity peak-to-average power ratio （PAPR） reduction method was proposed for orthogonal frequency division multiplexing （OFDM） systems. Firstly time-domain oversampling is performed, and then power normalization is adopted which is followed by clipping. Finally, the output clipped signals are filtered by a low-pass filter. In addition, effects of clipping on over sampled OFDM signals in terms of signal-to-noise ratio and signal-to-noise-plus-distortion, etc were analyzed. Simulation results demonstrate that, compared with traditional clipping technique, the proposed method can effectively reduce the PAPR re-growth after filtering.

关 键 词：正交频分复用 峰均功率比 限幅 

分 类 号：TN929.53[电子电信—通信与信息系统]