An Optimized Algorithm assisted PTS scheme for PAPR reduction in OFDM Systems

摘要

Partial Transmit Sequence (PTS) is an attractive and pragmatic technique for reduction of Peak to Average Power Ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) system, however it demands an exhaustive search over all possible combinations of allowable phase factors, resulting in larger computational complexity. In this paper the search for optimal phase factor is expressed as a combinatorial optimization problem and is effectively solved using the proposed algorithm assisted PTS method. The proposed algorithm performs a parallel direct search and generates candidates comparable to that of Optimal – PTS (O- PTS) but with reduced search complexity. The simulation performed on a OFDM signal with 1024 sub carriers justifies that the proposed algorithm with reduced computational complexity when compared to O-PTS and achieves significant PAPR reduction performance.