18-09-2017, 04:13 PM
WiMAX is a wireless broadband access technology compatible with fixed and mobility services. The WiMAX physical layer is based on OFDM / OFDMA technologies. This paper analyzes the distribution of Fourier Rays with various modulation frequencies (fm) by varying the number of frequency samples. The minimum quadratic channel (LS) and minimum mean square error (LMMSE) estimators are compared in terms of BER, SNR and MSE (Mean Square Error) by varying the channel length. Blind channel equalization is analyzed using the algorithms CMA (Constant Module Algorithm) and LMS (Minimum Minimum Square) in terms of convergence rate by varying the smoothing length of the channel. The results showed that without BER channel estimation it is almost constant for all modulation schemes.