PAPR reduction using subblock phase weighting (SPW) method in OFDM communication system

This paper deals with the subblock phase weighting (SPW) method to reduce the peak-to-average power ratio (PAPR) in OFDM system. SPW method divides the input block of OFDM signal into many subblocks and lower the peak power by weighting the phase of each subblocks properly. Unlike the conventional PTS and SLM method using many IFFTs, the SPW method can be realized by only one IFFT. In this paper, the PAPR reduction performance is examined when the adjacent, interleaved and random subblock partitioning schemes are used in the SPW system. The random subblock partition scheme has the most effective performance than the other schemes. In the SPW system, more subblocks can effectively reduce the PAPR, but the processing time of iteration is increased. To solve this problem, we propose a new weighting factor combination of the complementary sequence characteristic with threshold technique. OFDM data can be correctly recovered at receiver by the inserted side information of weighting factor in the feed forward type.