Peak-to-average Power Ratio Suppression Based on Multi-stage Optimal Phase (MSOP)-SLM

A multi-stage optimal phase selected mapping method is proposed to reduce the peak-to-average power ratio of OFDM signal. Compared with the conventional SLM, the proposed method can achieve 0.5-dB gain, keeping the computational complexity same.

I. Introduction

Orthogonal frequency division multiplexing (OFDM) system is a multi-carrier and parallel transmission system. Compared with the single-carrier system, the overlapping of the multi-carriers’ information leads to higher peak-to-average power ratio (PAPR) [1]. High PAPR will require higher-linear amplifiers. If the signals’ variation is beyond the linear range of amplifiers, the signals will be distorted by the amplifiers. Thus, the orthogonality between the subcarriers will be destructed [2].