Communication device for performing beamforming and operating method thereof

Patent metadata

Field	Value
Publication number	US-11689262-B2
Application number	US-202117539769-A
Country	US
Kind code	B2
Filing date	Dec 1, 2021
Priority date	Dec 3, 2020
Publication date	Jun 27, 2023
Grant date	Jun 27, 2023

Abstract

An operating method of a communication device for providing a beamformed transmission signal to a plurality of terminals may include determining a target transmission vector based on an area restriction condition for each of the plurality of terminals, generating a beam selection matrix for selecting some of a plurality of antennas based on the target transmission vector and a beam selection condition, generating a precoding matrix based on the target transmission vector and the beam selection matrix, and generating a transmission signal based on the beam selection matrix and the precoding matrix.

First claim

What is claimed is:

1. An operating method of a communication device for providing a beamformed transmission signal to a plurality of terminals, the operating method comprising:
determining a target transmission vector based on an area restriction condition, the area restriction condition being defined such that a strength of the beamformed transmission signal with respect to each of the plurality of terminals is amplified based on constructive interference generated from other terminals among the plurality of terminals;
generating a beam selection matrix for selecting a portion of antennas from among a plurality of antennas based on the target transmission vector and a beam selection condition;
generating a precoding matrix based on the target transmission vector and the beam selection matrix; and
generating the beamformed transmission signal based on the beam selection matrix and the precoding matrix.

2. The operating method of claim 1 , further comprising:
obtaining terminal channel information about the plurality of terminals; and
determining a beamforming matrix and a channel matrix based on the terminal channel information.

3. The operating method of claim 1 , wherein the determining of the target transmission vector comprises determining, as the target transmission vector, a candidate transmission vector having a minimum difference between a location on a complex plane of a transmission signal generated based on a candidate transmission vector among candidate transmission vectors according to the area restriction condition and a location of a target point on a complex plane corresponding to each of the plurality of terminals.

4. The operating method of claim 1 , wherein the determining of the target transmission vector comprises:
calculating a first transmission weight based on a first candidate transmission vector among candidate transmission vectors according to the area restriction condition and a first candidate beam selection vector among candidate beam selection vectors according to the beam selection condition; and
determining, as a second candidate transmission vector, a candidate transmission vector having a minimum difference with respect to the first transmission weight among the candidate transmission vectors.

5. The operating method of claim 4 , wherein the determining of the target transmission vector further comprises:
calculating a first beam selection weight based on the second candidate transmission vector and the first candidate beam selection vector; and
determining, as a second candidate beam selection vector, a candidate beam selection vector having a minimum difference with respect to the first beam selection weight among the candidate beam selection vectors.

6. The operating method of claim 5 , wherein the determining of the target transmission vector further comprises, when a vector evaluation value generated based on the second candidate transmission vector and the second candidate beam selection vector is less than or equal to a threshold value, determining the second candidate transmission vector as a loop transmission vector and determining the second candidate beam selection vector as a loop beam selection vector.

7. The operating method of claim 6 , wherein the vector evaluation value is calculated based on a weight parameter and a difference between the loop transmission vector and the loop beam selection vector.

8. The operating method of claim 7 , wherein the determining of the target transmission vector further comprises, by increasing the weight parameter and generating the vector evaluation value, generating the target transmission vector and a target beam selection vector based on the loop transmission vector and the loop beam selection vector.

9. The operating method of claim 1 , wherein the beam selection matrix is a matrix for selecting, as the portion of antennas, antennas activated by a radio frequency (RF) chain circuit from among the plurality of antennas.

10. The operating method of claim 9 , wherein the generating of the beam selection matrix comprises determining elements in a row of a matrix corresponding to the RF chain circuit based on a beam selection weight.

11. The operating method of claim 10 , wherein, in the beam selection matrix, a sum of elements in each row corresponding to the RF chain circuit is equal to a first value, and a sum of elements in remaining rows is equal to a second value.

12. The operating method of claim 11 , wherein elements of a row corresponding to the RF chain circuit have a value having a minimum difference with respect to the beam selection weight.

13. The operating method of claim 1 , wherein the beamformed transmission signal is generated in a unit of a data symbol of the communication device based on the beam selection matrix and the precoding matrix.

14. An operating method of a communication device for providing a beamformed transmission signal to a plurality of terminals, the operating method comprising:
generating a precoding signal by precoding transmission data corresponding to each of the plurality of terminals based on a precoding matrix; and
based on a beam selection matrix for selecting a portion of antennas from among a plurality of antennas, generating a transmission signal corresponding to each of the portion of antennas,
wherein
the transmission signal corresponding to each target terminal is constructively interfered by an interference vector corresponding to another terminal in a transmission signal component and has an amplified strength, and
the transmission signal includes a target terminal vector, which is a transmission signal component corresponding to the target terminal, and the interference vector, and a signal of the target terminal vector is constructively interfered by the interference vector.

15. The operating method of claim 14 , wherein the precoding signal includes a set of vectors corresponding to a number of activated radio frequency (RF) chains.

16. The operating method of claim 14 , wherein the generating of the transmission signal comprises allocating transmission signals corresponding to the portion of antennas to the precoding signal based on the beam selection matrix.

17. The operating method of claim 14 , wherein the generating of the transmission signal comprises:
selecting selection signals corresponding to the portion of antennas based on the beam selection matrix; and
generating the transmission signal based on the selection signals, a beamforming matrix, and a channel matrix according to a channel state of each terminal.

18. A communication device comprising:
a plurality of antennas each configured to output a beamformed transmission signal to a plurality of terminals;
a radio frequency (RF) chain arranged in a number less than a number of the plurality of antennas; and
a processor configured to determine a beam selection matrix and a precoding matrix based on an area restriction condition and a beam selection condition for each of the plurality of terminals, the area restriction condition being defined such that a strength of a transmission signal with respect to each of the plurality of terminals is amplified based on constructive interference generated from another terminal among the plurality of terminals,
wherein the transmission signal is generated by the beam selection matrix and the precoding matrix, the strength of the transmission signal being amplified based on the constructive interference by an interference vector corresponding to the other terminal.

19. The communicat

Assignees

• Samsung Electronics Co Ltd

Inventors

• Choi Yongin
• Kwon Yangsoo
• Kim Joonsung
• Oh Jinwoo
• Kim Mingoo
• Kim Inhyoung
• Jung Youngseok
• Choi Jinwon

Classifications

• H04B7/06952

  Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping · CPC title

• H04B7/0695

  using beam selection · CPC title

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title

• H04B7/0615 Primary

  of weighted versions of same signal · CPC title

• H04B7/0456 Primary

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title