A reduced complexity subcarrier switching scheme for PAPR reduction in OFDM system

Abstract

High values of Peak to Average Power Ratio or PAPR is a fundamental problem of Orthogonal Frequency Division Multiplexing (OFDM) systems. Literature survey shows that recent research works on PAPR reduction are proposing schemes focusing on IEEE standard based systems. One such technique is the null and data subcarrier switching method- a scheme that can reduce PAPR without any need of side information, causes no distortion and can complement other existing methods. However, the associated computational complexity of this method can be very high. In this paper, we propose a modified technique based on the subcarrier switching method that can reduce computational complexity to a great extent with very little or no loss in the PAPR reduction. In addition, we also present further PAPR reduction capability of our scheme with low computational overhead by making compromise on the no-side information advantage. © 2011 Springer-Verlag.