# US 12,119,917 B2 · System and method for providing channel recovery for angle domain sparse channels

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- Number: US 12,119,917 B2
- Document ID: US12119917B2
- Status: Granted
- Kind: B2
- Application number: 17/989,332
- Filed: 2022-11-17
- Published: 2023-03-16
- Granted: 2024-10-15
- Earliest claimed: 2019-08-27
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Yanru Tang; Hongbing Cheng; Kee-Bong Song
- Web page: https://patentgrep.com/patent/US12119917B2

## CPC

- H04B 7/0695: {using beam selection}
- H04B 7/086: {using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming}
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/0617: {for beam forming}
- H04B: TRANSMISSION

## Abstract

A system and method are provided in which an input including a measurement output of digital channel information is received. The digital channel information includes an estimated digital channel, a beamforming codebook, and quantized angle of arrival (AoA) values. A basis corresponding to one of the quantized AoA values is selected according to a largest projection power of the measurement output. A partial channel is recovered based on the beamforming codebook and the estimated digital channel. An analog channel is recovered based on the partial channel and the basis.

## Claims

### Claim 1

A method comprising:
receiving an input including a measurement output of digital channel information, the digital channel information comprising an estimated digital channel, a beamforming codebook, and quantized angle of arrival (AoA) values;
selecting a basis from a set of bases according to a largest projection power of the measurement output onto the set of bases, wherein each basis in the set of bases corresponds to a respective one of the quantized AoA values;
recovering a partial channel based on the beamforming codebook and the estimated digital channel; and
recovering an analog channel based on the partial channel and the basis.

### Claim 2 (depends on 1)

The method of claim 1, wherein selecting the basis comprises:
determining the set of bases; and
parameterizing each basis in the set of bases by a corresponding quantized AoA value.

### Claim 3 (depends on 2)

The method of claim 2, wherein the basis is selected based on the beamforming codebook and the estimated digital channel.

### Claim 4 (depends on 1)

The method of claim 1, wherein recovering the analog channel is performed utilizing a partial identity codebook or a uniform discrete Fourier transform (DFT) codebook.

### Claim 5

A system comprising:
a memory; and
a processor configured to:
receive an input including a measurement output of digital channel information, the digital channel information comprising an estimated digital channel, a beamforming codebook, and quantized angle of arrival (AoA) values;
select a basis from a set of bases according to a largest projection power of the measurement output onto the set of bases, wherein each basis in the set of bases corresponds to a respective one of the quantized AoA values;
recover a partial channel based on the beamforming codebook and the estimated digital channel; and
recover an analog channel based on the partial channel and the basis.

### Claim 6 (depends on 5)

The system of claim 5, wherein, in selecting the basis, the processor is further configured to:
determine the set of bases; and
parameterize each basis in the set of bases by a corresponding quantized AoA value.

### Claim 7 (depends on 6)

The system of claim 6, wherein the basis is selected based on the beamforming codebook and the estimated digital channel.

### Claim 8 (depends on 5)

The system of claim 5, wherein recovering the analog channel is performed utilizing a partial identity codebook or a uniform discrete Fourier transform (DFT) codebook.

### Claim 9

A non-transitory computer readable storage medium storing instructions that, when executed, cause a processor to:
receive an input including a measurement output of digital channel information, the digital channel information comprising an estimated digital channel, a beamforming codebook, and quantized angle of arrival (AoA) values;
select a basis from a set of bases according to a largest projection power of the measurement output onto the set of bases, wherein each basis in the set of bases corresponds to a respective one of the quantized AoA values;
recover a partial channel based on the beamforming codebook and the estimated digital channel; and
recover an analog channel based on the partial channel and the basis.

### Claim 10 (depends on 9)

The non-transitory computer readable storage medium of claim 9, wherein, in selecting the basis, the instructions further cause the processor to:
determine the set of bases; and
parameterize each basis in the set of bases by a corresponding quantized AoA value.

### Claim 11 (depends on 10)

The non-transitory computer readable storage medium of claim 10, wherein the basis is selected based on the beamforming codebook and the estimated digital channel.

### Claim 12 (depends on 9)

The non-transitory computer readable storage medium of claim 9, wherein recovering the analog channel is performed utilizing a partial identity codebook or a uniform discrete Fourier transform (DFT) codebook.