Reduction of PAPR using Modified SLM Technique-Application to OFDM Systems

Orthogonal Frequency Division Multiplexing (OFDM) is an efficient method of data transmission. It is a base for high speed communication systems. The main drawback of OFDM system is that it suffers from high Peak – to – Average Power Ratio (PAPR). Due to high PAPR there is inefficient use of high power amplifier and this could limit transmission efficiency. OFDM consist of large number of independent subcarriers, as a result of which the amplitude of such a signal can have high peak values. In this paper, we introduce a modified SLM technique to reduce PAPR. The simulation results show PAPR can be reduced by applying the proposed scheme. The complexity is also reduced in proposed scheme. The PAPR of original OFDM is near about 10.4dB. By using SLM technique with original OFDM PAPR is reduced nearly about 3.5dB. And by using the modified SLM technique PAPR is reduced nearly about 3.8dB in comparison to original OFDM.