一种降低OFDM系统峰均比的改进算法

摘要

SLM（Selected Mapping） is an effective algorithm for reducing peak-to-average power ratio（PAPR） of OFDM system without distortion.To reduce PAPR of OFDM system,a method for reducing PAPR based on SLM combined with counter-balance technology is proposed.This method uses improved SLM scheme to optimize the performance of PAPR in multi-carries system,then a group of sampling signals are used as reference signals to reduce PAPR.The principles of SLM and peak cancellation are analyzed.The simulation results shows that the PAPR performance of this method has lower PAPR with lower complexity and bit error rate compared with the original SLM.%选择映射（SLM）技术是一种无失真降低正交频分复用（OFDM）系统信号峰均比的方法,为更好地降低正交频分复用系统的峰均比,文中提出了一种基于SLM级联抵消技术降低PAPR的优化算法。该算法首先利用改进的SLM算法,对系统PAPR特性进行优化,然后利用抽样信号作为参考函数,实现对系统峰均比的有效降低。通过分析SLM级联峰值抵消的原理和算法,仿真结果表明,该方法可以在较小计算量和误码率的条件下,获得比原有SLM技术更低的PAPR。