Date Added: Sep 2012
WiMAX is wireless Interoperability for microwave access has emerged as a promising solution for transmission of higher data rates for fixed and mobile applications. IEEE 802.16d and e are the standards proposed by WiMAX group for fixed and mobile. As the wireless channel have so many limitation Such as multipath, Doppler spread, delay spread and Line Of Sight (LOS)/Non Line Of Sight (NLOS) components. To attain higher data rates the multi carrier system with Multiple Input and Multiple Output (MIMO) is incorporated in the WiMAX. The Orthogonal Frequency Division Multiplexing (OFDM) is a multi carrier technique used with the WiMAX systems.