Design A Hybrid Approach To Reduce Papr In Ofdm

Abstract

Due to the advancement in wireless communication, multimedia based applications are growing and these applications require high speed data transmission. OFDM abbreviated as orthogonal frequency division multiplexing provides orthogonal subcarriers as well as uses bandwidth efficiently. OFDM is most preferable technique for signal encoding as compare to other techniques. The advantage of OFDM over other techniques is that it makes effective use of frequency spectrum. OFDM is a robust technique. It is much efficient against multipath fading channels. OFDM consist of guard bands and sub carriers which lead to the less effect of noise and ISI. The disadvantage of OFDM is that it affects the power efficiency due to the occurrence of PAPR. In this paper a new technique is proposed. In this work Companding and filtering is applied to the signals in order to decrease the PAPR and this technique s named as hybridization method to reduce PAPR.  In order to prove the efficiency of the proposed technique results section is also described in this work.