SIGNAL SEPARATING DEVICE AN SIGNAL SEPARATING METHOD

摘要

Provided is a signal separating device capable of reducing the calculation amount and improving the communication quality. The signal separating device performs signal separation by the MLD method using the QR decomposition. The signal separating device includes: a nearest-neighbor signal point candidate detecting unit (120) which detects a nearest-neighbor signal point which is a signal point on a constellation used on the last stage and at the minimum distance from each of signal points obtained when fixing all the remaining combinations of the signal point candidates decided up to the last stage but one in the MLD; a signal point candidate selecting unit (130) which selects m (m is a natural number not greater than the modulation multi-value number of the reception signal) signal points (in each of the signal points, each target bit of the nearest-neighbor signal point is reversed) on the constellation corresponding to the respective nearest-neighbor signal points; and a distance calculation unit (140) which calculates an amount indicating an Euclid distance from each of the nearest-neighbor signal points and the selected signal points to the reception signal points after subjected to the unitary transform associated with the last stage.