Patent ID: 7233634
Filing Date: 2007-06-19
Classification: H04L

Abstract:
1. A method of maximum likelihood decoding for detecting signals transmitted over a Multiple-Input-Multiple-Output (MIMO) channel of a communication system in which there are N co-channel transmit antennas and M co-channel receive antennas where N and M are integers, comprising the steps of: receiving a signal at the M co-channel receive antennas and plotting a corresponding received signal point (y) in an M-dimensional output signal space; mapping the received signal point to a corresponding noise corrupted transmit signal point (τ) in an N-dimensional input signal space; considering an array of possible transmit signal points in the input signal space, limiting a candidate set of the array of possible transmit signal points to those located inside an orthotope centered on the noise corrupted transmit signal point derived from the received signal, which orthotope has sides parallel to the axes of the input signal space; and processing the limited candidate set of possible transmit signal points to determine a detected received signal point.