Patent ID: 8259855
Filing Date: 2012-09-04
Classification: H04L

Abstract:
1. An equalizing structure for a receiving device of a wireless communication system, in which two or more transmit signals transmitted in parallel from one or more transmitters are received in received signal vectors representing two or more received data streams, the signals comprising information modulated onto carrier signals according to a modulation scheme, wherein all possible transmit signals are represented by candidate constellation values in the signal constellation of the modulation scheme, the structure comprising: a processor configured to calculate an estimate for a constellation value of a received signal based on a product of a pseudo inverse matrix of channel estimation values with the received signal vector and to determine a number of candidate constellation values in the vicinity of the estimated constellation value in the signal constellation; a metric value calculator configured to calculate metric values based on the received signal vectors and the product of the channel estimation values with candidate signal vectors, each candidate signal vector comprising a candidate constellation value for each of the two or more transmit signals, wherein the metric values are calculated for each constellation value of the number of candidate constellation values and the estimated constellation value; and a maximum likelihood detector configured to detect one of the candidate signal vectors having a minimum Euclidean distance to a respective receive signal vector as a most likely transmit signal vector based on the metric values.