Forward channel variation detection in a wireless communication system

摘要

A method in a wireless communication system having a forward channel corresponding to transmissions from a first device to a second device, and a reverse channel corresponding to transmissions from the second device to the first device, includes initiating, at the first device, a first update of a steering matrix. The steering matrix is used to beamform transmissions on the forward channel. The method also includes monitoring, at the first device, a plurality of reverse channel estimates corresponding to the reverse channel, determining, at the first device, a metric indicative of a rate of change in the reverse channel based on the plurality of reverse channel estimates, and initiating, at the first device, a second update of the steering matrix based on a comparison between (i) the metric indicative of the rate of change in the reverse channel and (ii) a threshold.

主权项

1. A method in a wireless communication system having a forward channel corresponding to transmissions from a first device to a second device, and a reverse channel corresponding to transmissions from the second device to the first device, the method comprising:
initiating, at the first device, a first update of a steering matrix, wherein the steering matrix is used to beamform transmissions on the forward channel; determining, at the first device, (i) a first plurality of reverse channel estimates corresponding to (a) the reverse channel and (b) a first time, and (ii) a second plurality of reverse channel estimates corresponding to (a) a second time later than the first time and (b) the reverse channel; estimating, at the first device, a time domain correlation based on the first plurality of reverse channel estimates and the second plurality of reverse channel estimates; and initiating, at the first device, a second update of the steering matrix based on a comparison between (i) the time domain correlation and (ii) a threshold.