Signal detection in multiple-input-multiple-output communication system

A method of detecting signals in a MIMO communication system, the method comprising:

• receiving symbols coded into pairs using a space-time code;
• estimating a channel matrix that identifies the response between multiple transmit and receive antennas in the MIMO communication system;
• performing a plurality of QR factorization on the channel matrix to obtain a plurality of Q and R matrices;
• determining a receive vector corresponding to a plurality of transmitted symbols received by the multiple receive antennas;
• performing a plurality of transformations of the receive vector based upon the plurality of Q matrices;
• estimating a value of at least two received symbols for each of the plurality of transformations to determine at least two estimated symbols;
• removing a contribution of the estimated symbols from the receive vector to determine a revised received vector for each of the transformations;
• and
• estimating a value of at least two additional received symbols for each of the plurality of transformations to determine at least two additional estimated symbols.

A method of detecting signals transmitted from multiple transmit antennas generated from symbol pairs that are space-time coded in a receiver having multiple receive antennas, the method comprising:

• determining a channel matrix that identifies the response between the multiple transmit and receive antennas;
• transforming the channel matrix to a virtual channel;
• performing partial spatial filtering based upon the virtual channel on received signals;
• performing space-time decoding on the received signals;
• making decision estimates of symbols represented by at least one of the received signals;
• and
• performing interference cancellation using the at least one estimated symbol.

A method of detecting signals transmitted from multiple transmit antennas generated from symbol pairs that are space-time coded in a receiver having multiple receive antennas, the method comprising:

• determining a channel matrix that identifies the response between the multiple transmit and receive antennas;
• transforming the channel matrix to a virtual channel;
• performing partial spatial filtering based upon the virtual channel on received signals;
• performing space-time decoding on the received signals;
• making decision estimates of pairs of symbols received through receive antennas having the maximum distance between them;
• and
• performing interference cancellation using the at least one estimated symbol;
• and
• the distance between their respective antennas is maximized.