Eigenvalue decomposition precoding matrix index selection

Patent metadata

Field	Value
Publication number	US-10879970-B2
Application number	US-202016854168-A
Country	US
Kind code	B2
Filing date	Apr 21, 2020
Priority date	Nov 21, 2018
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

A method and system for selecting precoding matrix index are herein disclosed. The method includes determining a precoder and candidate beams, selecting base beams based on a correlation power between the determined precoder and determined candidate beams, and estimating amplitude coefficients and cophase coefficients by projecting a channel on the selected base beams.

First claim

What is claimed is:

1. A method for selecting precoding matrix index (PMI), comprising:
determining a precoder and candidate beams;
selecting base beams based on a correlation power between the determined precoder and determined candidate beams; and
estimating amplitude coefficients and cophase coefficients by projecting a channel on the selected base beams.

2. The method of claim 1 , wherein the precoder is determined by a reduced dimension singular value decomposition (SVD).

3. The method of claim 2 , wherein the reduced dimension SVD reduces the precoder determination from a 4×4 SVD calculation to a 2×2 SVD calculation.

4. The method of claim 1 , wherein selecting base beams further comprises selecting integer indices.

5. The method of claim 4 , wherein selecting integer indices is based on linear complexity in a multiple input multiple output (MIMO) system.

6. The method of claim 1 , wherein selecting base beams further comprises selecting fractional indices.

7. The method of claim 1 , wherein the estimating the amplitude and cophase coefficients is based on a wide band amplitude scaling factor {circumflex over (p)} r,l,i WB and a per subband amplitude scaling adjustment factor {circumflex over (p)} r,l,i,k SB .

8. The method of claim 1 , wherein the projecting the channel on the selected base beams comprises identifying optimal linear combination coefficients (LCCs).

9. The method of claim 1 , wherein the projecting the channel on the selected base beams comprises projecting the channel on a j-th PMI subband to a space of a beam selection matrix.

10. The method of claim 9 , wherein the projecting the channel on the j-th PMI subband to the space of the beam selection matrix comprises determining optimum precoding vectors.

11. A system for selecting precoding matrix index (PMI), comprising:
a transmitter;
a receiver; and
a processor configured to:
determine a precoder and candidate beams;
select base beams based on a correlation power between the determined precoder and determined candidate beams; and
estimate amplitude coefficients and cophase coefficients by projecting a channel on the selected base beams.

12. The system of claim 11 , wherein the processor is configured to determine the precoder by a reduced dimension singular value decomposition (SVD).

13. The system of claim 12 , wherein the reduced dimension SVD reduces the precoder determination from a 4×4 SVD calculation to a 2×2 SVD calculation.

14. The system of claim 11 , wherein the processor is further configured to select base beams by selecting integer indices.

15. The system of claim 14 , wherein the processor is further configured to select integer indices based on linear complexity in a multiple input multiple output (MIMO) system.

16. The system of claim 11 , wherein the processor is further configured to select base beams by selecting fractional indices.

17. The system of claim 11 , wherein the processor is further configured to estimate the amplitude and cophase coefficients based on a wide band amplitude scaling factor {circumflex over (p)} r,l,i WB and a per subband amplitude scaling adjustment factor {circumflex over (p)} r,l,i,k SB .

18. The system of claim 11 , wherein the projecting the channel on the selected base beams comprises identifying optimal linear combination coefficients (LCCs).

19. The system of claim 11 , wherein the projecting the channel on the selected base beams comprises projecting the channel on a j-th PMI subband to a space of a beam selection matrix.

20. The system of claim 19 , wherein the projecting the channel on the j-th PMI subband to the space of the beam selection matrix comprises determining optimum precoding vector.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Zhan Qi
• Cheng Hongbing
• Song Kee-Bong

Classifications

• H04B7/0695

  using beam selection · CPC title

• H04B7/043

  using best eigenmode, e.g. beam forming or beam steering · CPC title

• H04B7/0456 Primary

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