Data equalisation in a communication receiver wth transmit and receive diversity

A method for performing data equalisation in a communication receiver, the communication receiver forming part of a communication system with transmit and receive diversity, the method including the steps of:

• (a) for each i-th receiver antenna and j-th transmitter antenna, calculating a channel response matrix Hi,j from multi-path channel estimates;
• (b) each i-th receiver antenna, calculating a channel gain matrix Gi from the channel response matrices Hi,j and a scalar noise factor β;
• (c) calculating the middle column c0 of the inverse Gi−1 of the channel gain matrix Gi;
• (d) calculating filter coefficient vectors wi,j from the middle column c0 of the inverse Gi−1 of the channel gain matrix Gi and the Hermitian transpose Hi,jH of the corresponding channel response matrices Hi,j;
• (e) filtering input data ri received at each i-th receiver antenna with the corresponding filter coefficient vectors wi,j;
• (f) despreading the filtered input data from each i-th receiver antenna;
• (g) applying phase compensation to the despread data;
• and
• (h) combining the despread data from all antennas to obtain received equalised data.