PAPR Reduction using DWT with Nonlinear Effects of HPA in OFDM system

In wireless communication systems, the design and analysis of an orthogonal frequency division multiplexing (OFDM) system is highly affected by the nonlinear effects of high power amplifier (HPA). The nonlinear effects of HPA reducing the OFDM system performance. OFDM signalling exhibits high peak-to-average power ratio (PAPR) which results in large sensitivity to nonlinear distortion created by the use of HPA at the end of wireless transmitter. In this paper we have investigated the nonlinear distortion effects in an OFDM system and the performance of DWT-OFDM against conventional FFTOFDM in terms of PAPR and BER in the system. Simulation results of the proposed technique shows a prominent reduction of 2.6 dB in PAPR. Keywords— HPA , OFDM and Nonlinear effects , DWT , FFT , PAPR .