System and methods for reducing uplink resources to provide channel performance feedback for adjustment of downlink MIMO channel data rates

摘要

Systems and methods for improving the performance of a MIMO wireless communication system by reducing the amount of uplink resources that are needed to provide channel performance feedback for the adjustment of data rates on the downlink MIMO channels. In one embodiment, a method comprises encoding each of a set of data streams according to corresponding data rates, permuting the data streams on a set of MIMO channels according to a full permutation of combinations, transmitting the permuted data streams, receiving the permuted data streams, decoding and determining an SNR for each of the data streams, computing a condensed SNR metric for the set of data streams, providing the condensed metric as feedback, determining a set of individual SNR metrics for the data streams based on the condensed SNR metric, and adjusting the data rates at which the data streams are encoded based on the individual SNR metrics.

主权项

1. A method for wireless communications, comprising:
receiving a first plurality of permuted data streams over a plurality of channels; inversely permuting the first plurality of permuted data streams; determining a quality metric for each data stream of the first plurality of permuted data streams based on different blocks of data for each data stream being permuted and transmitted over different ones of a plurality of antennas; determining a condensed quality metric based on the quality metrics for each data stream of the first plurality of permuted data streams, wherein the condensed quality metric is condensed with respect to a combination of the quality metrics for each data stream and comprises a reference quality metric and at least one delta quality metric indicative of quality metrics for the first plurality of permuted data streams; transmitting the condensed quality metric; and receiving at least one data stream of a second plurality of permuted data streams over the plurality of channels at a data rate that is based on the condensed quality metric.