An Improved PLCT for Adaptive Companding in PAPR Reduction

Abstract

The most popular technique used for high data rate services in 4G scenario is MIMO - OFDM. This paper proposes a novel adaptive companding method for Peak to Average Power Ratio reduction in IEEE 802.16 standards used in 4G wireless mobile communications with Orthogonal Space Time Block Coded MIMO-OFDM systems. This is obtained by fixing compander parameters independently for statistically unrelated symbols in OFDM waveform and according to the features of input symbols. The bit error rate performance analysis of the proposed system under Rayleigh fading MIMO channel conditions has also been presented. Simulation results showed that the proposed method performs better for a given PAPR preset value and observed a slight improvement in the BER performance over fixed compander.