Patent ID: 6873651

Claim:
A method for communicating signals between a first communication device and a second communication device using radio frequency (RF) communication techniques, comprising: a. at the first communication device: i. generating a transmit filter vector for processing a signal to be transmitted from the first communication device via a plurality of antennas of the first communication device to the second communication device, the transmit filter vector comprised of a plurality of transmit filter sub-vectors defining one or more complex weights associated with a transmit tapped-delay line filter, each transmit filter sub-vector associated with a corresponding one of the plurality of antennas of the first communication device and having a length corresponding to the number taps of the associated transmit tapped-delay line filter; and ii. applying the transmit filter vector to a signal to be transmitted from the first communication device to the second communication device; b. at the second communication device: i. generating a receive filter matrix from a signal received by one or more antennas of the second communication device from the first communication device, the receive filter matrix comprised of one or more sub-matrices each being a convolution matrix derived from a receive filter sub-vector, wherein each receive filter sub-vector defines one or more complex weights associated with a receive tapped-delay line filter for a corresponding one of the one or more antennas of the second communication device; ii. computing a principal eigenvector of a product of the receive filter matrix and a Hermitian of the receive filter matrix, the principal eigenvector comprised of one or more sub-vectors each having a length corresponding to a number of taps of a transmit tapped-delay line filter associated with a corresponding one of the one or more antennas of the second communication device; iii. deriving from the one or more sub-vectors of the principal eigenvector one or more transmit filter sub-vectors that form a transmit filter vector, each transmit filter sub-vector associated with a corresponding one of the one or more antennas of the second communication device and defining one or more complex weights associated with the transmit tapped-delay line filter for a corresponding one of the one or more antennas of the second communication device; and iv. applying the transmit filter vector at the second communication device to a signal to be transmitted from the second communication device to the first communication device.