PAPR reduction of coded OFDM system using low complexity PTS

Abstract

For achieving high throughput OFDM (orthogonal frequency division multiplexing) is a good technique for parallel transmission of information at improved rate. Two important areas of concern with OFDM especially in fading environments are less BER (bit error rate) and large value of PAPR. Channel coding combined with OFDM system such as Turbo codes increase the error correction capabilities of the system thus improving BER performance of un-coded OFDM system. High PAPR (peak to average power ratio) increase the circuit complexity and cost of high power amplifier (HPA) used in the system. Partial transmit sequence (PTS) is the good probabilistic scrambling technique which is most preferred for PAPR reduction. In this paper a Turbo coded OFDM scheme with Modified PTS using Riemann sequences and post clipping-filtering is used. The BER efficiency of the coded OFDM system with un-coded OFDM and PAPR efficiency of modified PTS with conventional PTS is compared and excellence of the proposed system in terms of BER and PAPR is justified. For implementation of COFDM system IEEE 802.11a standard is used.