International Journal on Electronics & Communication Technology (IJECT)
Now-a-days, most high-speed wireless communication standards adopt both Multiple-Input-Multiple-Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) operation. This applies to small-scale wireless data networks, such as the 802.11n wireless LAN (Local Area Network) standard, as well as large-scale cellular systems such as WiMAX and Long Term Evolution (LTE) (including its enhanced version LTE-A) that are considered 4G cellular candidates. In a wideband frequency selective fading channel is divided into several independent narrowband flat-fading. In addition to the construction of these sub channels at the transmitter, the receiver hardware is required to independently perform channel processing (estimation and equalization) for each and every one of these sub channels.