Equalising Structure And Method With Maximum Likelihood Detection

摘要

The present invention relates to an equalising structure ( 10 ) and method for a receiving device of a wireless communication system, in which two or more information signals are transmitted in parallel from one or more transmitters, wherein for the information signals transmit information is modulated onto carrier signals according to a modulation scheme, whereby all possible data symbols are represented as constellation points in the signal constellation of the modulation scheme and whereby the equalizing structure ( 10 ) performs, for each information signal, a maximum likelihood detection in order to determine a constellation point with a minimum Euclidean distance to a received signal vector as a most likely received signal vector by searching over the whole set of possible transmit signals, S_m, the equalising structure ( 10 ) comprises means ( 11 ) for detecting channel estimation information in the information signals and means. ( 31 ) for calculating the product of channel matrix, H,_n, and transmit signal vector, s_m, based on the channel estimation information detected by the detecting means ( 11 ), wherein the calculating means ( 31 ) calculates the product of channel matrix, H_m, and transmit signal vector, s,_n, in at, least two steps, wherein in the first step a partial product of channel matrix, H_m, and transmit signal vector, s_m, based on at least one or a part of the channel estimation information detected by the detecting means ( 11 ) is calculated. The reference signals used for channel estimation are sent from the different transmitter antennas with time offset from each other.