US 2008/0291978 A1 · Receiver Parametric Covariance Estimation for Transmit Diversity

Abstract

A parametric form of G-Rake and chip equalization for closed-loop transmit diversity is provided, that accounts for impairment correlation between transmit antennas. In a closed-loop transmit diversity system, the base station transmits a signal from two or more antennas, using one of a predetermined set of relative phase offsets at one of the antennas. The parametric estimation of the impairment or data covariance is performed by summing terms, including a term for each possible phase offset. The terms are weighted by fitting parameters. The fitting parameters are jointly solved by fitting the impairment or data covariance estimate to a measured impairment or data covariance. In another aspect, a measured impairment covariance is formed by exploiting a special relationship between the pilot channels of the different transmit antennas.

Claims32

Dependent claims

A method of processing a received information signal transmitted from at least primary and secondary transmit antennas, the method comprising:

receiving a spread-spectrum information signal transmitted from at least primary and secondary transmit antennas, the second antenna transmitting the signal using one of a plurality of known antenna weights relative to the primary antenna;
computing impairment or data covariance terms corresponding to the plurality of relative antenna weights of the secondary antenna;
measuring an impairment or data covariance associated with the received information signal;
jointly estimating values of fitting parameters in response to the measured impairment or data covariance and the computed impairment or data covariance terms;
and
estimating a received signal impairment or data covariance for the received information signal by applying the estimated values of the fitting parameters to the impairment or data covariance terms.

3 more elements

Dependencies are inferred from the claim text.

Receiver Parametric Covariance Estimation for Transmit Diversity

Life of this patent

Receiver Parametric Covariance Estimation for Transmit Diversity

Life of this patent

Abstract

Claims32