关键词: 正交频分复用, 选择性映射, 峰平比

Abstract:

  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.

Key words: OFDM;SLM;PAPR