Channel estimation and equalization in OFDM receiver for WiMAX with Rayleigh distribution

Abstract

WiMAX is a broadband wireless access technology supports fixed and mobility services. WiMAX physical layer is based on OFDM/OFDMA technologies. This paper analyzes the Rayleigh fade distribution with various modulating frequencies (fm) by varying number of frequency samples. Least square (LS) and Linear Minimum Mean Square Error (LMMSE) channel estimators are compared in terms of BER, SNR and MSE (Mean Square Error) by varying channel length. Blind Channel equalization is analyzed with CMA (Constant Modulus Algorithm) and LMS (Least Minimum Square) algorithms in terms of convergence rate by varying the smoothening length of the channel. The results proved that without channel estimation BER is almost constant for all modulation schemes.