Multiplex communications – Diagnostic testing – Determination of communication parameters
Reexamination Certificate
2011-01-18
2011-01-18
Juntima, Nittaya (Department: 2462)
Multiplex communications
Diagnostic testing
Determination of communication parameters
C370S338000, C455S101000, C375S227000
Reexamination Certificate
active
07872981
ABSTRACT:
Techniques for selecting rates for data transmission on eigenmodes of a MIMO channel are described. An access point transmits an unsteered MIMO pilot via the downlink. A user terminal estimates the downlink channel quality based on the downlink unsteered MIMO pilot and transmits an unsteered MIMO pilot and feedback information via the uplink. The feedback information is indicative of the downlink channel quality. The access point estimates the uplink channel quality and obtains a channel response matrix based on the uplink unsteered MIMO pilot, decomposes the channel response matrix to obtain eigenvectors and channel gains for the eigenmodes of the downlink, and selects rates for the eigenmodes based on the estimated uplink channel quality, the channel gains for the eigenmodes, and the feedback information. The access point processes data based on the selected rates and transmits steered data and a steered MIMO pilot on the eigenmodes with the eigenvectors.
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International Search Report and Written Opinion—PCT/US06/017962—International Search Authority, US—Aug. 8, 2007.
Abraham Santosh
Meylan Arnaud
Nanda Sanjiv
Juntima Nittaya
Nguyen Thien T.
Qualcomm Incorporated
Qualcomm Patent Group
Yancey, Jr. James Hunt
LandOfFree
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