Orthogonal Frequency Division Multiplexing (OFDM) is an efficient method of data transmission for high speed communication systems. One of the challenging issues for OFDM system is its high Peak-to-Average Power Ratio (PAPR) which causes inefficient use of the High Power Amplifier (HPA) and could limit transmission efficiency. In this paper we analyze the effects of PAPR on HPA and its reduction technique based on GCD matrix In Selected Mapping (SLM) method. Simulation results shows that the

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... phase sequence based SLM method has good performance in PAPR reduction. signal. The new phase sequence based SLM technique has proposed to reduce the PAPR, so that the HPA operates in linear region. OFDM System Model and PAPR Problem In this section, we review the basic OFDM transmitter and PAPR definition. The model considered for the implementation of OFDM transmitter basically consist of the following block.