Receiver parametric covariance estimation for precoded MIMO transmissions

摘要

A model-based technique for estimating signal impairments that can accommodate various transmitted signal configurations, including closed-loop transmit diversity signals and pre-coded MIMO signals, is disclosed. In an exemplary method, an impairment model is constructed for a received composite information signal comprising at least a first data stream transmitted from first and second antennas according to a first antenna weighting vector. The impairment model includes one or more model terms scaled by corresponding scaling parameters, wherein the model terms capture propagation channel effects and are independent of the first antenna weighting vector, and wherein the scaling parameters capture effects of the first antenna weighting vector. A parametric estimate of the impairment covariance is calculated using the impairment model.

主权项

1. A method implemented in a wireless receiver of estimating impairment covariance associated with a received composite information signal comprising at least a first data stream transmitted from first and second antennas according to a first antenna weighting vector, the method comprising:
generating first and second propagation channel estimates in the wireless receiver based on the received composite signal; constructing an impairment model including one or more model terms scaled by corresponding scaling parameters, wherein:
a first impairment model term in the impairment model is a function of the first propagation channel estimates corresponding to the first antenna;a second impairment model term in the impairment model is a function of the second propagation channel estimates corresponding to the second antenna;a third impairment model term in the impairment model is a function of both the first and second propagation channel estimates;each of the first, second, and third impairment model terms are independent of the first antenna weighting vector; and the scaling parameters capture effects of the first antenna weighting vector; and computing a parametric estimate of the impairment covariance using the impairment model and the generated propagation channel estimates.