Wavelet OFDM-A solution for reliable communication in a frequency selective Rayleigh fading channel

Abstract

Wavelet transform based modulation techniques have been recently proposed in literature, with the motivation of offering more robustness, interference suppression, and providing greater bandwidth efficiency, compared to the Fourier transform based conventional modulation techniques. Wavelet Packet based Orthogonal Frequency Division Multiplexing (WOFDM) technique is a multicarrier modulation technique that has been compared to the conventional OFDM technique in various channel and noise conditions. This paper analyses the performance of WOFDM in a Rayleigh fading wireless communication channel, taking into consideration the Doppler shift in the presence of additive white Gaussian noise. It is shown through bit error rate performance that WOFDM system outperforms the conventional OFDM system with various Doppler shifts, and with interleaving and channel coding the system performance is further enhanced.