Patent ID: 8351455
Filing Date: 2013-01-08
Classification: H04B,H04L,H04W

Abstract:
1. A method for performing zero forcing beamforming at a base station (BS) of a wireless communications system, the method comprising: receiving feedback information from each mobile station (MS) in a first plurality of mobile stations (MSs); selecting a first MS from the first plurality of MSs, wherein the first MS having a largest value of a first metric based on the feedback information received from the first plurality of MSs; broadcasting information related to the first MS to the first plurality of MSs; receiving feedback information from each MS in a second plurality of MSs, wherein the second plurality of MSs is a subset of the first plurality of MSs; selecting a second MS from the second plurality of MSs, wherein the second MS having a largest value of a second metric based on the feedback information received from the second plurality of MSs; and creating a precoding matrix from feedback information from the first MS and the second MS, wherein the first metric comprises where PF 1 max is a first priority factor, SNR j max is a SNR reported by the MS j, α and β are fairness parameters, R j represents an average throughput of MS j and N 1 represents number of MSs in the first plurality of MSs.