4TX CODEBOOK ENHANCEMENT IN LTE

Japanese Patent JP2022160541

A

To provide a method for feeding back channel state information (CSI) in a wireless communication system.SOLUTION: In a method of deriving a precoding matrix indicator (PMI) from matrix multiplication of two matrices from a first codebook W1 and a second codebook W2, W1 includes at least a first precoding matrix PMI1 constructed with a first group of adjacent Discrete Fourier Transform (DFT) vectors or W1 includes at least a second precoding matrix PMI2 constructed with a second group of uniformly distributed non-adjacent DFT vectors. Alternatively, W1 includes at least PMI1 and PMI2, PMI1 is constructed with the first group of adjacent DFT vectors, and PMI2 is constructed with the second group of uniformly distributed non-adjacent DFT vectors.SELECTED DRAWING: Figure 6

Eco Ongosanushi
Lanhua Cheng
Ralph Bendlin

JP2022121298A

October 19, 2022

July 29, 2022

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Texas Instruments Incorporated

H04B7/0456

US20120269290A1	2012-10-25
US20120219042A1	2012-08-30

FUJITSU: "Proposal for 4Tx enhanced Codebook[online]", 3GPP TSG-RAN WG1#72B R1-131797, JPN6023026583, 2 May 2013 (2013-05-02), ISSN: 0005100653
TEXAS INSTRUMENTS: "4Tx codebook enhancement in Rel.12[online]", 3GPP TSG-RAN WG1#72 R1-130825, JPN6023026584, 9 March 2013 (2013-03-09), ISSN: 0005100654
NOKIA, NOKIA SIEMENS NETWORKS: "On 4-Tx feedback[online]", 3GPP TSG-RAN WG1#62 R1-104446, JPN6023026582, 17 August 2010 (2010-08-17), ISSN: 0005100655

Hitoshi Sato
Kyozo Katayose

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