Coded Wavelet Ofdm Based Communication System for Rayleigh Fading Channel

March-April CODED WAVELET OFDM BASED COMMUNICATION SYSTEM FOR RAYLEIGH FADING CHANNEL Tabassum Nawaz Bajwa*, Arsla Khan, Sobia Baig Electrical Engineering Department, COMSATS Institute of Information Technology, Lahore, Pakistan *Corresponding author’s email :{[email protected]} ABSTRACT: Orthogonal frequency division multiplexing (OFDM) technique mitigates the effects of fading channels. However, due to its low spectral efficiency and signal interference it becomes disadvantageous. Therefore, Wavelet based OFDM (WOFDM) system is proposed in literature that offers better spectral efficiency with added robustness against fading and interference suppression. This paper evaluates the performance of the special features of convolutionally coded WOFDM system i-e vanishing moments and wavelet levels with convolutionally coded DFT-OFDM system with varying doppler shifts in time varying frequency selective rayleigh fading channel. The simulation results show that WOFDM outperforms DFT-OFDM system due to its special property of cancelling any possible distortion and aliasing effects through its wavelet filter banks.