Apparatus and method for detecting signal in communication system using multiple antenna

The present invention at least as two or more of the communication system using transmission antenna, and the signal detected in the method, the process of selecting a symbol corresponding to a minimum branch metric value of the symbols of the number corresponding to the modulation scheme and the selected accumulates the process to the process of selecting a symbol corresponding to the minimum of the metric values ​​at the symbol once more the number of antennas transmitting expansion by a small number of determining the candidate symbols, and set the accumulated branch metric value of the candidate symbol as a reference value over the reference value, of removes symbols having a metric value, including the step of selecting a symbol corresponding to the route having the minimum cumulative branch metric value of the selected path is not removed until the last stage as the final received symbols. QRD-M algorithm, the tree seoching, a modulation scheme, a branch metric value,