Method and system for utilizing tone grouping with givens rotations to reduce overhead associated with explicit feedback information

摘要

Aspects of a method and system for utilizing tone grouping with Givens rotations to reduce overhead associated with explicit feedback information are presented. In one aspect of the invention, Givens matrices may be utilized to reduce a quantity of information communicated in explicit feedback information via an uplink RF channel. The explicit feedback information may include specifications for a feedback beamforming matrix that may be utilized when transmitting signals via a corresponding downlink RF channel. The feedback beamforming matrix may represent a rotated version of an un-rotated matrix. The Givens matrices may be utilized to apply one or more Givens rotations to un-rotated matrix. The rotated matrix may reduce the quantity of information communicated in the explicit feedback information. The quantity of information communicated in the explicit feedback information may be further reduced by utilizing tone grouping.

主权项

1. A receiving mobile terminal for use in a MIMO communication system, the receiving mobile terminal comprising:
a transceiver for receiving a signal from a transmitting mobile terminal on a downlink RF channel in said MIMO communication system; and a processor for computing a beamforming matrix based on the signal and generating feedback information therefrom, the feedback information including feedback angles representing the beamforming matrix, the feedback angles including at least one angle for each tone group, each said tone group having a tone group size corresponding to a number of frequency carriers of a plurality of frequency carriers on the downlink RF channel included in said tone group; wherein the transceiver further communicates the feedback information to the transmitting mobile terminal on an uplink RF channel.