Equalising structure and method with maximum likelihood detection

An equalizing method for equalizing signals transmitted and received in a wireless communication system, in which two or more information signals are transmitted in parallel from one or more transmitters to one or more receivers, wherein for the information signal transmit information is modulated onto carrier signals according to a modulation scheme by a modulator, whereby all possible data symbols are represented as constellation points in a signal constellation of the modulation scheme, and whereby the equalizing structure performs, for each information signal, a maximum likelihood detection 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 a whole set of possible transmitted signals, the equalizing method comprising:

• detecting channel estimation information in the information signals by a channel estimator;
• and
• calculating a product of channel matrix and transmit signal vector by a calculating means based on the channel estimation information detected by the channel estimator,
• wherein the product of channel matrix and transmit signal vector is calculated, wherein a partial product of channel matrix and transmit signal vector based on at least one or a part of the channel estimation information detected is calculated.

A system of transmitting and receiving, in which two or more information signals are transmitted in parallel, 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 a signal constellation of the modulation scheme, and whereby the equalizing structure performs, for each information signal, a maximum likelihood detection 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 a whole set of possible transmitted signals, a receiving device of the system comprising:

• a channel estimator for detecting channel estimation information in the information signals;
• and
• calculating means for calculating a product of channel matrix and transmit signal vector based on the channel estimation information detected by the channel estimator,
• wherein the calculating means calculates the product of channel matrix and transmit signal vector, wherein a partial product of channel matrix and transmit signal vector based on at least one or a part of the channel estimation information detected by said channel estimator is calculated.

An equalizing structure 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 the transmit information is modulated onto carrier signals according to a modulation scheme, wherein all possible data symbols are represented as constellation points in a signal constellation of the modulation scheme and wherein the equalizing structure performs, for each information signal, a maximum likelihood detection to determine a constellation point having a minimum Euclidean distance to a received signal vector as a most likely received signal vector by searching over a whole set of possible transmitted signals, the equalizing structure comprising:

• a channel estimator that detects channel estimation information in the information signals;
• and
• a calculator that calculates a product of channel matrix and transmit signal vector based on the channel estimation information detected by the channel estimator,
• wherein the calculator calculates the product of channel matrix and transmit signal vector wherein a partial product of channel matrix and transmit signal vector based on at least one or a part of the channel estimation information detected by the channel estimator is calculated.