Patent ID: 6952455

Claim:
A method for transmitting signals from a plurality of antennae at a transmitting unit to a receiving unit, the method comprising the steps of: (a) generating a plurality of sinusoidal radio carriers corresponding to each of the plurality of antennae; (b) modulating the plurality of sinusoidal radio carriers with a modulating signal; (c) during a first time period, adjusting amplitude and phase of the plurality of radio carrier signals corresponding to the plurality of antennae according to a magnitude and angle of a corresponding element of a first test weight vector, w test1 , comprised of one complex element for each antenna of the transmitting unit; (d) creating radio waves by transmitting the plurality of radio carrier signals, as adjusted according to the preceding step and as modulated by the modulating signal, from the corresponding plurality of antennae; (e) during a second time period that does not overlap with the first time period, adjusting the amplitude and phase of the plurality of radio carrier signals of a test signal corresponding to the plurality of antennae according to a magnitude and angle of a corresponding element of a second test weight vector, w test2 , comprised of one complex element for each antenna of the transmitting unit, wherein the second test weight vector is different from the first test weight vector; (f) creating radio waves by transmitting the plurality of radio carrier signals, as adjusted according to the preceding step and as modulated by the modulating signal, from the corresponding plurality of antennae; and (g) generating a new weight vector, w new , based upon feedback received from the receiving unit, as an explicit mathematical function of the first and second test weight vectors.