Joint interleaving and selected mapping technique with LCT for PAPR reduction in OFDM signals

One of the major problems that faces any wireless communication system that apply orthogonal frequency division multiplexing (OFDM) is the peak-to-average power ratio (PAPR). In this paper, a joint interleaving and selected mapping (SLM) method is proposed to reduce PAPR in OFDM signals. Then, linear companding transform (LCT) is employed for farther PAPR reduction. Joining interleaving and SLM is accomplished by generating randomly interleaved data streams and multiply it by a random phases sequences (SLM). Then the resultant sequence with lowest PAPR is processed by LCT. Simulations results show that the proposed technique simultaneously decrease bit error rate (BER) over AWGN and reduce PAPR by 4.5dB.