一种降低OFDM系统PAPR的低复杂度算法

选择映射(SLM)是一种无失真降低OFDM信号峰平比(PAPR)的有效方法,但该方法通过串并转换将一路信号变为U路信号,再对U路信号进行IFFT处理,计算量大,同时也降低了信号传输速率。文中提出了一种改进的随机筛选法方案,该方法在IFFT模块之前就对序列进行选择,根据判决门限选择其中随机性最好的一路信号进行传输。其与SLM法相比,只进行一路信号的IFFT计算,复杂度大幅降低,且提高了信号传输效率,并在较大程度上降低了OFDM信号的峰平比。

A Low Complexity Algorithm for Reducing OFDM System PAPR

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 this scheme needs to dispose of U paths of IFFT,which increases the amount of computation and reduces the signal transmission rate.This article gives an improved algorithm based on SLM,which is called Random Screening SLM (RSSLM).The proposed algorithm fulfills the selection before the FFT modules.On the basis of decision threshold,the scheme only selects the one sequence with the best randomness to transmit to IFFT modules,thus a much lower complexity than that by SLM method.The improved scheme enhances the transmission rate of signal,and greatly decreases the PAPR of OFDM signals.