Reduced complexity parametric covariance estimation for...

Details Reduced complexity parametric covariance estimation for... Reduced complexity parametric covariance estimation for...

2011-06-07

2011-06-07

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S148000

Reexamination Certificate

active

07957485

ABSTRACT:
A model-based technique for estimating impairment covariance associated with a MIMO signal 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 first and second model terms corresponding to the first and second antennas, respectively, but in several embodiments does not include a cross-antenna interference term. In another embodiment, an impairment model for a received MIMO signal is constructed by computing an impairment model term for each antenna and an additional term to account for preceding interference in a single-stream MIMO transmission scenario. The impairment terms are grouped so that only two associated scaling terms are unknown; values for the scaling terms are estimated by fitting the model to measured impairment covariance values.

REFERENCES:
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patent: 2005/0069023 (2005-03-01), Bottomley et al.
patent: 2005/0201447 (2005-09-01), Cairns et al.
patent: 2006/0256843 (2006-11-01), Grant et al.
Jonsson, E. et al. “Receiver Parametric Convariance Estimation for Transmit Diversity.” Co-pending U.S. Appl. No. 11/751,109, filed May 21, 2007.
Bottomley, G. E. et al. “A Generalized RAKE Receiver for Interference Suppression.” IEEE Journal on Selected Areas in Communications, vol. 18, No. 8, Aug. 2000, pp. 1536-1545.
Fulghum, T. L. et al. “Method and Apparatus for Determining Combining Weights for MIMO Receievers.” Co-pending U.S. Appl. No. 11/613,677, filed Dec. 20, 2006.

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