Patent ID: 8130877

Claim:
An apparatus for detecting a signal at a receiver in a multi-antenna system using spatial multiplexing, the apparatus comprising: at least one antenna for receiving a signal; a channel estimator for estimating a channel using the received signal; a detector for determining multiplication values commonly used to determine a Euclidean distance using the received signal and channel information and for detecting a transmitted signal by determining Euclidean distances of one or more candidate symbols using the received signal and the determined multiplication values, wherein the detector comprises: a front-end multiplier for determining the multiplication values commonly used to determine the Euclidean distance using the received signal and the channel information; a distance calculator for determining the Euclidean distances of one or more candidate symbols using the multiplication values acquired at the front-end multiplier and the received signal; a signal detector for selecting a candidate symbol having the shortest Euclidean distance as a signal to detect amongst the Euclidean distances determined at the detector; and a storage for storing the multiplication values determined at the front-end multiplier, wherein the distance calculator determines a Euclidean distance of each candidate symbol using the multiplication values stored in the storage.