Codebook construction
AssigneeNEC Corporation
InventorsNarayan Prasad, Guosen Yue, Mohammad Khojastepour, Sampath Rangarajan
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Abstract
A method implemented in a base station used in a wireless communications system is disclosed. The method comprises having 1-layer, 2-layer, 3-layer, and 4-layer codebooks for 4 transmit antenna (4TX) transmission, each codebook including a plurality of precoding matrices, (precoding data with one of the plurality of precoding matrices, and transmitting, to a user equipment, the precoded data, wherein each of the 1-layer and 2-layer codebooks comprises a first codebook and a second codebook, and wherein each precoding matrix in the first codebook comprises a first index and a second index. Other apparatuses, systems, and methods also are disclosed.
Claims15
A method implemented in a user equipment used in a wireless communications system, the method comprising:
- receiving, from four transmit antennas of a base station having 1-layer, 2-layer, 3-layer, and 4-layer codebooks for 4 transmit antenna (4TX) transmission, each codebook including a plurality of precoding matrices, precoded data with one of the plurality of precoding matrices;
- and
- decoding, according to the one of the plurality of precoding matrices, the precoded data,
- wherein the 1-layer codebook comprises a first 1-layer codebook and a second 1-layer codebook each of which includes a plurality of 4×1 precoding matrices, and the 2-layer codebook comprises a first 2-layer codebook and a second 2-layer codebook each of which includes a plurality of 4×2 precoding matrices, and
- wherein each precoding matrix in the first 1-layer and 2-layer codebooks comprises a first index and a second index.
A base station having 1-layer, 2-layer, 3-layer, and 4-layer codebooks for four transmit antenna (4TX) transmission, each codebook including a plurality of precoding matrices used in a wireless communications system, the base station comprising:
- a precoder configured to precode data for decoding according to one of the plurality of precoding matrices;
- and
- a transmitter configured to transmit, to a user equipment, the precoded data,
- wherein the 1-layer codebook comprises a first 1-layer codebook and a second 1-layer codebook each of which includes a plurality of 4×1 precoding matrices, and the 2-layer codebook comprises a first 2-layer codebook and a second 2-layer codebook each of which includes a plurality of 4×2 precoding matrices, and
- wherein each precoding matrix in the first 1-layer and 2-layer codebooks comprises a first index and a second index.
A user equipment used in a wireless communications system, the user equipment comprising:
- a receiver configured to receive, from a base station having 1-layer, 2-layer, 3-layer, and 4-layer codebooks for 4 transmission antenna (4TX) transmission, each codebook, including a plurality of precoding matrices, precoded data;
- and
- a decoder configured to decode the precoded data according to the one of the plurality of precoding matrices,
- wherein the 1-layer codebook comprises a first 1-layer codebook and a second 1-layer codebook each of which includes a plurality of 4×1 precoding matrices, and the 2-layer codebook comprises a first 2-layer codebook and a second 2-layer codebook each of which includes a plurality of 4×2 precoding matrices, and
- wherein each precoding matrix in the first 1-layer and 2-layer codebooks comprises a first index and a second index.
Dependencies are inferred from the claim text.