Reduction Of PAPR Using HADAMARD SLM In SFBC MIMO- OFDM System

This paper contains the Hadamard Transform in the SLM for the reduction of high peak to average power ratio (PAPR) in MIMOOFDM systems. In this technique, the input sequence is multiplied by a set of phase rotation vectors respectively and then applies the Hadamard Transform to the each resulting sequence based on SFBC. After that perform the Inverse Fast Fourier Transform in order to get the time domain signal. The equivalent SFBC encoding operations in the time domain for generating candidate signal sets is performed, where one with the lowest maximum PAPR is selected for transmission. The proposed method has lower computation complexity and reduces the PAPR. The experimental results shows that the PAPR reduction performance of Hadamard SLM technique and compare with the PIIM, SLM and with the Simplified SLM techniques. Keywords-Multiple-input Multiple output (MIMO); orthogonal frequency division multiplexing (OFDM); peak-to-average power ratio (PAPR) reduction; space frequency block coding (SFBC); Selected mapping (SLM) and Polyphase interleaving and inverse method(PIIM).