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US 9,544,031 B2Granted
Method of variable rate single user and multi user MIMO feedback for mobile communications system
AssigneesZte Corporation, ZTE (USA) Inc.
InventorsDavid Huo, Shupeng Li, Yifei Yuan
Life of this patent
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Abstract
A spatial channel state information (CSI) feedback technique is incorporated into multiple-input multiple-output mobile communications technologies. User equipment (UE) channel conditions are measured and, based on the measurements, codebook subsets are selected to which indices are assigned and fed back to a base station.
Claims16
A method to generate feedback in a multiple-input multiple-output (MIMO) system which comprises:
- performing at least one measurement of a channel condition;
- selecting a subset of a codebook based on the at least one measurement, the subset comprising a plurality of codewords and a plurality of indices;
- selecting one of the plurality of codewords based on a certain criterion and assigning one of the plurality of indices to the one of the plurality of codewords, wherein the one of the plurality of indices is assigned so a distance between a quantized composite spatial channel state information (CSI) and a floating-point composite spatial CSI minimized;
- and
- transmitting a feedback signal comprising the one of the plurality of indices.
2 more elements
A system to generate feedback in a multiple-input multiple-output (MIMO) system which comprises:
- a first circuit to perform at least one measurement of a channel condition;
- a second circuit to select a subset of a codebook based on the at least one measurement, the subset comprising a plurality of codewords and a plurality of indices;
- a third circuit to select one of the plurality of codewords based on a certain criterion and to assign one of the plurality of indices to the one of the plurality of codewords, wherein the one of the plurality of indices is assigned so a distance between a quantized composite spatial channel state information (CSI) and a floating-point composite spatial CSI minimized, and
- a transmitter to transmit a feedback signal comprising the one of the plurality of indices.
1 more element
Dependencies are inferred from the claim text.