Patent ID: 7236538

Claim:
A method of transmit antenna weight tracking in a communication system, wherein the communication system includes a transmitter and a receiver, wherein the transmitter includes a plurality of antennae, and wherein the communication system is capable of communicating utilizing a transmit adaptive antenna weighting technique, the method comprising: a) determining a channel autocorrelation matrix estimate of a forward channel gain vector, including calculating a reverse channel autocorrelation matrix estimate; and b) determining a transmitter antenna weight vector based on feedback from the receiver and the channel autocorrelation matrix estimate determined in the act (a), including subacts of i) determining a perturbation vector autocorrelation matrix based on the channel autocorrelation matrix estimate determined in the act (a), including calculating the perturbation vector autocorrelation matrix R v from a forward channel autocorrelation matrix R f estimate and a reverse channel autocorrelation matrix R r estimate according to the following equation: R v = 2 ⁢ ( a f ⁢ R ^ f  R ^ f  + a r ⁢ R ^ r  R ^ r  + ( 1 - a f - a r ) ⁢ I ) ; where a f and a r are algorithm parameters, wherein 0≦a f ≦1, 0≦a r ≦1, and 0≦(a f +a r )≦1; ii) generating a perturbation vector having an autocorrelation given by the autocorrelation matrix determined in act (i); iii) utilizing the perturbation vector from act (ii) in a waveform transmitted from the transmitter; and iv) utilizing a measurement of the waveform transmitted from the transmitter from act (iii) at the receiver to generate feedback.