Advanced switching DE algorithm based PTS companding technique for PAPR reduction in OFDM systems

Abstract

Partial Transmit Sequence (PTS) is an efficient method for diminishing the high Peak to Average Power Ratio (PAPR) for Orthogonal Frequency Division Multiplexing (OFDM) system. However, finding an optimum phase factor among different combinations of phase factors, rigorous searching is required. It ultimately increases the computational complexity. For practical implementation high computational complexity becomes crucial problem when a huge number of subcarriers are used in PTS based PAPR reduction technique for OFDM system. Hence, to reduce computational load an Advanced Switching Differential Evolution (ASDE) algorithm is incorporated in PTS scheme. In the proposed approach an optimized switching DE algorithm enhances computational efficiency. But, the PAPR reduction performance becomes poorer compared to conventional PTS scheme. To further reduce PAPR, two thresholds based $$\mu $$ law companding technique is incorporated along with ASDE PTS for OFDM system. The Matlab simulation revealed that, the proposed scheme performed better PAPR reduction and Bit Error Rate performance with less complexity compared to other relevant techniques.