Abstract: Orthogonal frequency division multiplexing (OFDM) also referred to as multi carrier communication systems, become a key technology in current and for future wireless communication systems. Due to OFDMís immunity to many channel imperfections, it is the ideal modulation scheme for many applications which transmit signals in hostile environments. Although, OFDM introduces major disadvantages like Peak to Average Power Ratio (PAPR), sensitivity to frequency offset. The PAPR of the transmitted signal power is large, necessitating power back off, unless PAPR reduction techniques are incorporated to control the resulting nonlinear distortion at the power amplification stage. In this paper the technique of Selected Mapping (SLM) is simulated for OFDM and it is found that using this technique with 16 alternative sub carrier vectors, PAPR is reduced to approximately 4.6 dB. But this scheme requires the transmission of the side information to indicate the used masking pattern. Hence, we should consider the reliability of this side information, which requires the high signaling overhead. So, SLM receiver based on maximum likelihood decoding that operates without side information has been implemented.

Keywords: Orthogonal frequency division multiplexing (OFDM), Peak-to-Average Power Ratio (PAPR), Selected mapping (SLM), Partial transmit sequences (PTS), Power amplifier (PA).