DWT based FFT in practical OFDM systems

OFDM is a multi-carrier technique based on a very simple modulation scheme that uses IFFT and FFT at its core for transmission and reception respectively. The performance of the OFDM receiver is significantly affected in the presence of noise in the wireless channel. In this work a receiver that has built-in denoising capacity with little additional computation is proposed. It is based on a DWT based FFT algorithm. Experiments using MATLAB are conducted to verify the feasibility of this denoising algorithm on OFDM signals. The result shows noise suppression thus supports our claim. © 2006 IEEE.