Patent ID: 8705443

Claim:
A method for transmitter operations, the method comprising: transmitting a pilot signal; receiving channel information feedback from a set of K communications devices served by a transmitter, where K is a non-negative integer value and K≧2, wherein the channel information feedback from a communications device comprises partial information for a communications channel between the transmitter and the communications device; selecting M communications devices out of the set of K communications devices in accordance with the channel information feedback, where M is a non-negative integer value and M≧K; computing a precoder for each of the M selected communications devices in accordance with the channel information feedback, wherein computing a precoder for each of the M selected communications devices comprises selecting one of the M selected communications devices and computing a precoder for the selected communications device by maximizing {circumflex over (V)} i10 P i1 , where {circumflex over (V)} i10 is a joint null space of [V 21 , . . . , V M1 ], and P i1 is a power allocation matrix; and simultaneously transmitting information to the M selected communications devices, wherein the information transmitted to each communications device in the M selected communications devices is precoded using a computed precoder associated with the communications device.