PAPR reduction technique on wavelet based OFDM system by employing multi-level wavelet transform

Wavelet based OFDM has an upper edge over Fast Fourier transform (FFT) based OFDM in terms of orthogonality and bandwidth usage. Though these qualities are an advantage, the fluctuations in input signal´s envelope cause a hike in Peak to Average Power ratio (PAPR). To tackle this problem we make use of PAPR reduction techniques in wavelet based OFDM. The results are analyzed using clipping, companding, double companding and hybrid techniques. Better results have been found using these techniques compared to simple FFT and wavelet based OFDM.