Patent ID: 8913513

Claim:
An apparatus for determining cross coupling coefficients in an antenna array having a plurality of antenna elements, the apparatus comprising: a multiplexing block configured to receive data signals to be transmitted via the antenna elements and to output to at least one of the antenna elements a sum signal including a data signal, which is designated for the at least one antenna element, and a linear combination of data signals designated for other antenna elements of the antenna array, each of the data signals in the linear combination being weighted by a respective cross coupling coefficient between the at least one antenna element and an antenna element emitting the each of the data signals; one or more measurement antennas located at positions corresponding to theoretical null points occurring when one or more predetermined sets of data are transmitted via the data signals, the positions being calculated without considering coupling effects of the antenna elements; and a processor configured to receive measurements of a total power received in each of the one or more measurements antennas and the data signals, to adjust the cross coupling coefficients to minimize the total power received by the one or more measurement antennas when the one or more predetermined sets of data are transmitted, and to transmit the adjusted cross coupling coefficients to the multiplexing block.