Patent ID: 8379781

Claim:
An apparatus for adaptively decoding based on a channel variation at a receiver of a communication system capable of supporting an Alamouti mode and a Spatial Multiplexing (SM) mode, the apparatus comprising: a channel variation estimator configured to estimate the channel variation; a channel estimator configured to estimate a channel value of successive channel periods or a channel value of each channel period by comparing the estimated channel variation with a threshold; an Alamouti decoder configured to decode a receive signal using an Alamouti method when the estimated channel variation is less than or equal to the threshold; a Spatial Multiplexing (SM) decoder configured to decode the receive signal using an SM method having a square channel matrix when the estimated channel variation is greater than the threshold; and an input scheduler configured to regulate an input pattern of the receive signal according to a supporting mode of the receiver, provide the regulated signal to the SM decoder, when the receiver supports the Alamouti mode, regulate the input pattern of the receive signal so as to provide signals received via a specified one of a plurality of antennas in a specified number of successive periods to the SM decoder at the same time, and when the receiver supports the SM mode, regulate the input pattern of the receive signal so as to provide signals received via each of the antennas in one period to the SM decoder at the same time when the receiver supports the SM mode.