A hybrid PAPR reduction technique based on Wavelet & PTS scheme in OFDM system using QPSK modulator

The Wavelet Transform (WT) based Orthogonal Frequency Division multiplexing (OFDM) multicarrier system gains widespread attention because of its better immune attainment to Inter-Carrier Interference (ICI) and InterSymbol Interference (ISI), and provided the higher spectrum efficiency. However, multicarrier system suffers from the shortcoming of high Peak to Average Power Ratio (PAPR), due to this high power amplifier (HPA) works in the non linear region, which causes out of band radiation interference and inter-modulation distortion which will lead to many problems such as lower system performance. In order to eliminate this problem, a hybrid PAPR reduction method based on Wavelet transformation and Partial Transmit Sequence (WAV-PTS) scheme is proposed in this paper. The proposed technique reduces the PAPR significantly and provides better bit error rate of the signal as compared to the conventional PTS scheme.