Method for generating downlink beamforming weighting vectors

Details Method for generating downlink beamforming weighting vectors Method for generating downlink beamforming weighting vectors

2008-02-21

2011-10-04

Eng, George (Department: 2617)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C370S344000, C370S383000, C370S260000, C370S210000

Reexamination Certificate

active

08032184

ABSTRACT:
Techniques are provided for generating downlink beamforming weighting vectors by using channel information about one or more uplink sub-channels in a wireless communications network in the case of frequency mismatch between downlink channels and uplink channels for a specific user. The method comprises calculating an average channel covariance matrix of one or more uplink sub-channels assigned to a specific user, dividing a sector of a cell into a plurality of sub-sectors, transforming the average channel covariance matrix into a plurality of average sub-sector channel covariance matrices and obtaining an average uplink beamforming weighting vector group corresponding to the plurality of sub-sectors, selecting direction of arrival (DOA) sub-sectors from the plurality of sub-sectors by using the plurality of average sub-sector channel covariance matrices, and computing a time delay sequence for the DOA sub-sectors, and generating downlink beamforming weighting vectors by using the average uplink beamforming weighting vectors corresponding to the DOA sub-sectors and the information derived from the time delay sequence.

REFERENCES:
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patent: 1515394 (2005-03-01), None
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International Search Report and Written Opinion dated Jun. 26, 2008 in PCT/US08/054547.

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