Channel Estimation of FFT-OFDM and DWT-OFDM for Different Fading Channels

Abstract

The Orthogonality frequency division multiplexing (OFDM) is a method of encoding digital data on multiple frequencies. TheOrthogonality allows high spectral efficiency and almost the whole available frequency to be utilized. By comparing the performance of FFT-OFDM and DWT-OFDM for channel noise and fading environment. Channel noise is additive white noise (AWGN) that affects the transmitted signal when passes through the channel. Fading environment is Rayleigh fading and Rician fading. To characterize the performance of FFT and DWT, bit error ratio (BER) is used as a parameter. This technique is more complicated than earlier forms of signals format, it provide some distinct advantages in terms of data transmission, especially where high data rates are needed along with relatively wide bandwidth.