Rate selection for eigensteering in a MIMO communication system
First Claim
1. An apparatus comprising:
- a channel processor to receive a first unsteered pilot via a first communication link and to derive a channel estimate for the first communication link based on the first unsteered pilot; and
a controller to receive feedback information indicative of channel quality of a second communication link and to select rates for eigenmodes of the second communication link based on the feedback information and the channel estimate.
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Accused Products
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.
22 Citations
36 Claims
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1. An apparatus comprising:
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a channel processor to receive a first unsteered pilot via a first communication link and to derive a channel estimate for the first communication link based on the first unsteered pilot; and a controller to receive feedback information indicative of channel quality of a second communication link and to select rates for eigenmodes of the second communication link based on the feedback information and the channel estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of performing rate selection, comprising:
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receiving a first unsteered pilot via a first communication link using at least one antenna; receiving feedback information indicative of channel quality of a second communication link; and selecting rates for eigenmodes of the second communication link based on the feedback information and the first unsteered pilot. - View Dependent Claims (16, 17, 18, 19)
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20. A hardware apparatus comprising:
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means for receiving a first unsteered pilot via a first communication link; means for receiving feedback information indicative of channel quality of a second communication link; and means for selecting rates for eigenmodes of the second communication link based on the feedback information and the first unsteered pilot. - View Dependent Claims (21, 22, 23, 24)
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25. A method of performing rate selection in a multiple-input multiple-output (MIMO) communication system, comprising:
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transmitting a first unsteered MIMO pilot via a downlink; receiving a second unsteered MIMO pilot and feedback information via an uplink, wherein the feedback information is indicative of downlink channel quality estimated based on the first unsteered MIMO pilot; and selecting rates for eigenmodes of the downlink based on the feedback information and the second unsteered MIMO pilot. - View Dependent Claims (26)
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27. An apparatus comprising:
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a pilot processor to generate a first unsteered pilot for transmission via a first communication link; a controller to send feedback information indicative of channel quality of a second communication link; and a spatial processor to receive a data transmission on eigenmodes of the second communication link, wherein the data transmission is sent at rates selected based on the first unsteered pilot and the feedback information. - View Dependent Claims (28, 29, 30)
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31. A method of performing rate selection, comprising:
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transmitting a first unsteered pilot via a first communication link; sending feedback information indicative of channel quality of a second communication link; and receiving a data transmission on eigenmodes of the second communication link, wherein the data transmission is sent at rates selected based on the first unsteered pilot and the feedback information. - View Dependent Claims (32, 33)
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34. A hardware apparatus comprising:
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means for transmitting a first unsteered pilot via a first communication link; means for sending feedback information indicative of channel quality of a second communication link; and means for receiving a data transmission on eigenmodes of the second communication link, wherein the data transmission is sent at rates selected based on the first unsteered pilot and the feedback information. - View Dependent Claims (35, 36)
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Specification