Patent ID: 7864896

Claim:
A receiver for a Spatial Multiplexing (SM) communication system, the receiver comprising: a determiner for performing a Modified Maximum Likelihood (MML) decoding operation in an ascending or descending order of transmit (TX) antennas to estimate a plurality of candidate TX vectors; a distance calculator for calculating a Euclidean distance for each of the candidate TX vectors from the determiner; and a Log Likelihood Ratio (LLR) calculator for calculating LLRs using the Euclidean distances from the distance calculator, wherein when a number of TX antennas is 2, on an assumption that an i th TX symbol transmitted from an i th TX antenna is c m (m=1, 2, . . . , M), the determiner determines a j th TX symbol d j to estimate the candidate TX vectors using d j = Q â¡ ( h j H ï˜… h j ï˜† 2 â¢ ( r - h i â¢ d i ) ) , where h denotes a channel vector, r denotes a receive (RX) vector, and Q( ) denotes a slicing function.