Immune Evolutionary Algorithm to Reduce PAPR of OFDM Signals Using PTS Technique

Partial transmit sequences (PTS) is a distortionless phase optimization technique that significantly improves peak-to-average power ratio (PAPR) performance with a small amount of redundancy for orthogonal frequency division multiplexing (OFDM) systems. However, the computational complexity in conventional PTS increases exponentially with the number of subblocks. In this paper, a novel global parallel algorithm, combining the immune and versatile evolutionary mechanism, is proposed for PTS technique to reduce computational complexity and improve PAPR performance. The proposed scheme restrains the degenerate phenomenon effectively during the evolutionary process, thus making the fitness of population increase steadily. The simulation results show that the proposed scheme achieves significant PAPR reduction while maintaining low complexity.