Performance Analysis of Wavelet and Fourier Transform in OFDM based system in Low Complexity Channel

Orthogonal Frequency Division Multiplexing(OFDM) is a form of multi carrier transmission with lots ofapplications in wireless systems. In this modulation scheme,Fourier transform is used to provide orthogonality amongsubcarriers. Wavelets have lots of advantages in time andfrequency domains. By using the transform, the spectralcontainment of Wavelet-based OFDM is better than Fourier baseon OFDM. In this paper, a comparison has been made betweenperformances of the Fourier transform and wavelets in OFDMbasedsystems in order to improve in high frequency (HF)channel. Simulation results show that wavelet transformsoutperform the Fourier transform in terms of bit error rate(BER) and system efficiency in HF channel.

کلیدواژه ها:

Cyclic Prefix ، Fourier Transform ، Low Complexity Channel ، Orthogonal Frequency Division Multiplexing (OFDM) ، Perfect Reconstruction ، Wavelet Transform