Proposal of improved PTS method for STBC MIMO-OFDM in the non-linear channel

Partial Transmit Sequences (PTS) seems to be attractive for Peak to Average Power Ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) system, since it obtains better PAPR property by modifying OFDM signals without distortion. Meanwhile it also shows the potential to be utilized in STBC MIMO-OFDM system. The PTS method can reduce the PAPR by controlling the multiplied weighting factor of sub-block both data sub carrier and clusters. The PTS method can improve PAPR reduction performance very well as increasing a number of weighting factors and clusters. However, the number of side information is proportionally increasing as increased number of weighting factors or/and clutters, which are required to inform the side information to the receiver for recovering the original data. In this paper, we propose the new weighting factor technique in the PTS method conjunction with STBC MIMO-OFDM system which can work well and improve both a better PAPR performance and BER performance with keeping the same number of side information when compares with the conventional PTS method. This paper presents various computer simulation results to verify the effectiveness of proposed method in the non-linear channel.