A combined PTS & SLM approach with dummy signal insertion for PAPR reduction in OFDM systems

Abstract

A novel combined approach of SLM (Selective Mapping), PTS (Partial Transmit Sequence) and DSI (Dummy Signal Insertion) is proposed to diminish PAPR (Peak to Average Power Ratio) and OBI (Out of Band Interference) in OFDM (Orthogonal Frequency Division Modulation) systems. The efficiency of OFDM decreases while the cost of installing HPA (High Power Amplifier) increases when the PAPR factor is high. A lot of research has been done to minimize this factor. The proposed method reduces the computational complexity by minimizing the number of IFFT (Inverse Fast Fourier Transform) operation to a half and the results show an effective decrement of PAPR by 0.6 - 1.4 dB. It also proved from the simulation results that it has 3.2 - 4 dB lower OBI when compared against the conventional and existing methods.