FPGA based Realization of PAPR Reduction in OFDM and Optimization using RWBS Algorithm for SDR Application

This paper proposes architecture for SDR (Software Defined Radio) system with OFDM (Orthogonal Frequency Division Multiplexing) Technique. SDR enables runtime reconfiguration of modulation and demodulation (QPSK, 16QAM, 64QAM) inside OFDM in Hardware. The Peak to power Average Ratio is a main design consideration of OFDM, which causes a degradation problem when a power amplifier is used. A combined algorithm commanding technique and then the signal pass through all pass filters. This Reduces the PAPR. The Companding transform is used to reduce the PAPR ratio without affection the parameters of OFDM. A linear Non-symmetrical Companding Transform (LNST) is used which gives better performance than other techniques. Rotating the sequence phase, by using multiple all pass filters. Finally calculate the Peak to Power Average Ratio (PAPR) and select the sequence with minimum PAPR ratio. Then apply an optimization algorithm RWBS (Repeated Weighted Boosting Search). The Implementation of this system can be done by using Partial Reconfigurable FPGA. The Partial Reconfiguration helps to modify the program without affecting the current Running program. Keywords— SDR, OFDM, QAM, PAPR Reduction Algorithms, RWBS, Optimization