Date Added: Apr 2011
Multimedia applications in wireless communication require very high data rate transmissions. To fulfil this demand, several methods have been proposed. Among them, Orthogonal Frequency Division Multiplexing (OFDM) and Multiple-Input Multiple-Output (MIMO) have emerged as two main techniques in the Long Term Evolution (LTE) and the future Fourth-Generation (4G) communications. In MIMO-OFDM systems, a plethora of methods have been developed for getting an accurate estimate of the channel. These methods can be classified into three classes, namely, training-based methods, blind methods and semi-blind methods.