Patent ID: 8477880

Claim:
A method for signal detection in a multi-input multi-output communication system receiving signals transmitted through a plurality of transmission antennas by using a plurality of reception antennas, the method comprising: detecting symbol candidate vectors with respect to transmission symbols transmitted through the plurality of transmission antennas on the basis of the signals received through the plurality of reception antennas; calculating Euclidean distances with respect to all the detected symbol candidate vectors; and detecting a vector having a minimum Euclidean distance among the symbol candidate vectors as a final symbol vector for each of the transmission symbols, wherein the detecting of the symbol candidate vectors includes: determining a symbol to be detected at present; and selecting symbol candidates of a predetermined number and detecting the selected symbol candidates as the symbol candidate vectors on the basis of error expected values of the symbol candidates among all transmissible symbol candidates on a constellation with respect to the determined symbol, wherein the error expected values are error expected values for errors generated when a corresponding symbol is mis-determined as a detection target, wherein the determining of the symbol to be detected at present includes: determining the symbol based on a reception filter matrix used to determine a position of the symbol and based on a reordering matrix calculated according to a channel matrix representing channel characteristics between the plurality of reception antennas and the plurality of transmission antennas, and wherein the determining of the symbol based on the reception filter matrix and based on the reordering matrix includes: calculating the reception filter matrix used to determine the position of the symbol and calculating the reordering matrix by applying the calculated reception filter matrix to the channel matrix representing channel characteristics between the plurality of reception antennas and the plurality of transmission antennas; analogizing the reception filter matrix and the reordering matrix for the symbol to be detected at present on the basis of the reception filter matrix and the reordering matrix used at the time of determining the position of a previous symbol detected in a case where the symbol to be detected at present is not a first symbol.