PAPR Reduction of OFDM Signals Using Modified Partial Transmit Sequences

Partial transmit sequences (PTS) is an effective technique to reduce the peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing signals. However, the conventional partial transmit sequence (PTS) technique requires an exhaustive searching over all the combinations of the given phase factors, which results in the computational complexity increases exponentially with the number of the sub-blocks, so it is difficult to achieve in practical system. This paper proposed a novel scheme which searches the combination of phase factor by means of a modified neighborhood search method. Simulation results show that this scheme can greatly reduce the complexity with a little degradation of system's performance.