Abstract: Orthogonal Frequency Multiplexing (OFDM) has been increasingly used in modern wired and wireless communication systems due to its high data rate, immunity to noise and high frequency spectral efficiency. The major drawback in using OFDM technique is its high Peak to Average Power Ratio (PAPR). Within the existing PAPR reduction techniques, Selective Mapping is most popularly used Technique. In this paper, we discuss various PAPR reduction techniques. And find out that the signal scrambling techniques are having most advantages in terms of no out of band radiations and BER. But these techniques are more complex than others.

(OFDM) is vastly used in every communication system for high data rate transmission. It has several advantages along with one major flaw of Peak-to-Average-Power Ratio (PAPR). In fact, PAPR in OFDM system is the most detrimental aspect which degrades power and spectral spreading [md]. In this paper, we reduce PAPR to 4 dB using a Hybrid method of three different techniques as Huffman, ZCT pre-coding and SLM for 64 sub-carriers using 64 PSK modulation. We obtain simulation results for Huffman and SLM, ZCT and SLM and proposed method. These results illustrate that the proposed scheme significantly outperforms all the other techniques. Keywords-Orthogonal frequency division multiplexing