Optimal Phase Selection For Pts Using Gpw And Rpw To Reduce Papr In Ofdm Systems

OFDM is a suitable candidate for high data rate trans- mission with forward error correction (FEC) methods over wireless channels and there is a growing need to quickly transmit information wirelessly and accurately. This paper proposes a new peak to average power ratio (PAPR) reduction technique. In wideband system each sub carrier is individually modulated according to chan- nel state information. The proposed measured increases the system throughput while maintaining system perfor- mance under a desired condition. In order to obtain the optimum condition on partial transmit sequence (PTS) for PAPR reduction, a quite large calculation cost is de- manded and thus it is impossible to obtain the optimum PTS in a short time. The PTS technique employs with grouping phase weighting (GPW) and recursive phase weighting (RPW). The proposed reduction method real- izes both the advantages of GPW and RPW at the same time. Simulation results show that proposed method im- proves PAPR in OFDM system with drastic reduction in cost.