Closed-loop multiple-input-multiple-output scheme for wireless communication based on hierarchical feedback
First Claim
1. A method implementable in a base station having a plurality of antennas, comprising:
- transmitting a plurality of reference signals from the plurality of antennas;
receiving information indicative of at least a first codeword associated with a codebook from at least one user device after transmitting the plurality of reference signals;
precoding at least one symbol using at least the first codeword;
transmitting to the at least one user device the at least one precoded symbol;
receiving feedback from the at least one user device after the at least one user device has received said at least one precoded symbol;
precoding at least one second symbol using at least a second codeword, the second codeword being determined based at least on the feedback and the first codeword; and
transmitting to the at least one user device the at least one precoded second symbol.
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Abstract
The present invention provides methods implemented in a base station having a plurality of antennas and one or more user terminals. One embodiment of the method includes receiving feedback from at least one user in response to transmitting a first frame to said at least one user. The first frame is formed by pre-coding at least one symbol using at least one first code word selected from at least one first code book associated with the at least one user. The method also includes transmitting at least one second frame to the user(s). The second frame(s) are pre-coded using at least one second codeword selected from at least one second codebook. The second codebook(s) determined based on the feedback and the first codeword(s).
12 Citations
38 Claims
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1. A method implementable in a base station having a plurality of antennas, comprising:
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transmitting a plurality of reference signals from the plurality of antennas; receiving information indicative of at least a first codeword associated with a codebook from at least one user device after transmitting the plurality of reference signals; precoding at least one symbol using at least the first codeword; transmitting to the at least one user device the at least one precoded symbol; receiving feedback from the at least one user device after the at least one user device has received said at least one precoded symbol; precoding at least one second symbol using at least a second codeword, the second codeword being determined based at least on the feedback and the first codeword; and transmitting to the at least one user device the at least one precoded second symbol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method implementable in user equipment, comprising:
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receiving a plurality of reference signals from a plurality of antennas associated with a base station; determining at least a first codeword associated with a codebook based on the plurality of reference signals; transmitting information indicative of at least the first codeword towards the base station; receiving at least one symbol that is precoded using at least the first codeword; transmitting feedback from the user equipment after receiving said at least one precoded symbol; and receiving at least one second symbol that is precoded using at least a second codeword, the second codeword being determined based at least on the feedback and the first codeword. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A base station comprising:
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a plurality of antennas configurable to transmit a plurality of reference signals and receive information indicative of at least a first codeword associated with a codebook from at least one user device after transmitting the plurality of reference signals; and a precoder configurable to precode at least one symbol using at least the first codeword, and wherein the plurality of antennas are configurable to transmit to the at least one user device the at least one precoded symbol and receive feedback from the at least one user device after the at least one user device has received said at least one precoded symbol, and wherein the precoder is configurable to precode at least one second symbol using at least a second codeword, the second codeword being determined based at least on the feedback and the first codeword, and wherein the plurality of antennas are configurable to transmit to the at least one user device the at least one precoded second symbol. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An apparatus comprising user equipment configurable to:
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receive a plurality of reference signals from a plurality of antennas associated with a base station; determine at least a first codeword associated with a codebook based on the plurality of reference signals; transmit information indicative of at least the first codeword towards the base station; receive at least one symbol that is precoded using at least the first codeword; transmit feedback from the user equipment after receiving said at least one precoded symbol; and receive at least one second symbol that is precoded using at least a second codeword, the second codeword being determined based at least on the feedback and the first codeword. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
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Specification