Wideband extremely large array antenna system and ofdm-based hybrid beamforming method for hybrid-field interference control of the same

Patent metadata

Field	Value
Publication number	US-2024162962-A1
Application number	US-202318352124-A
Country	US
Kind code	A1
Filing date	Jul 13, 2023
Priority date	Nov 16, 2022
Publication date	May 16, 2024
Grant date	—

Abstract

This disclosure relates to a wideband extremely large array antenna system and an OFDM-based hybrid beamforming for hybrid-field interference control of the same. The wideband extremely large array antenna system for OFDM-based hybrid beamforming of this disclosure may include a transmitter having a plurality of transmit antennas, and a receiver capable of communication with the transmitter and having a plurality of receiving antennas, and the system may be configured to perform a first step for designing a common analog beamforming matrix for all subcarriers between the transmitter and the receiver, and a second step for designing a baseband beamforming matrix for each of the subcarriers.

First claim

1 . An OFDM-based hybrid beamforming method of a wideband extremely large array antenna system, comprising:
designing a common analog beamforming matrix for all subcarriers between a transmitter and a receiver; and designing a baseband beamforming matrix for each of the subcarriers.

2 . The OFDM-based hybrid beamforming method of claim 1 , wherein in the wideband extremely large array antenna system, there is a hybrid-field composed of a near-field and a far-field between the transmitter and the receiver, and
wherein the designing the analog beamforming matrix comprises: acquiring oblique projection matrixes of the near-field and the far-field in channel information of the subcarriers by using arrival angle and departure angle information between the transmitter and the receiver; and designing the analog beamforming matrix by using the oblique projection matrixes.

3 . The OFDM-based hybrid beamforming method of claim 1 , wherein the designing the analog beamforming matrix designs the analog beamforming matrix by extracting dominant eigenvectors through eigenvalue decomposition of virtual analog beamforming matrixes for the subcarriers.

4 . The OFDM-based hybrid beamforming method of claim 2 , wherein the designing the analog beamforming matrix by using the oblique projection matrixes comprises:
acquiring channels of the near-field and the far-field for each of the subcarriers by using the oblique projection matrixes; acquiring individual analog beamforming matrix for each of the subcarriers by accumulating virtual analog beamforming matrixes for each of the subcarriers in response to the channels and applying singular value decomposition; and designing the analog beamforming matrix by extracting dominant eigenvectors through eigenvalue decomposition of individual analog beamforming matrixes of the subcarriers.

5 . The OFDM-based hybrid beamforming method of claim 1 , wherein the designing the analog beamforming matrix extracts many dominant eigenvectors as the number of RF chains.

6 . The OFDM-based hybrid beamforming method of claim 5 , the designing the baseband beamforming matrix designs the baseband beamforming matrix by using the dominant eigenvectors.

7 . The OFDM-based hybrid beamforming method of claim 1 , further comprising, after designing the baseband beamforming matrix, aligning data streams between the transmitter and the receiver through singular value decomposition.

8 . The OFDM-based hybrid beamforming method of claim 1 , wherein the transmitter has a plurality of the transmit antennas, and uses RF chains less than or equal to the number of the transmit antennas, and
the receiver has a plurality of receiving antennas, and uses RF chains less than or equal to the number of the receiving antennas.

9 . A wideband extremely large array antenna system for OFDM-based hybrid beamforming, comprising:
a transmitter having a plurality of transmit antennas; and a receiver capable of communication with the transmitter and having a plurality of receiving antennas, and wherein the system is configured to perform: a first step for designing a common analog beamforming matrix for all subcarriers between the transmitter and the receiver; and a second step for designing a baseband beamforming matrix for each of the subcarriers.

10 . The wideband extremely large array antenna system of claim 9 , wherein in the wideband extremely large array antenna system, there is a hybrid-field composed of a near-field and a far-field between the transmitter and the receiver, and
wherein the first step is configured to: acquire oblique projection matrixes of the near-field and the far-field in channel information of the subcarriers by using arrival angle and departure angle information between the transmitter and the receiver, and design the analog beamforming matrix by using the oblique projection matrixes.

11 . The wideband extremely large array antenna system of claim 9 , wherein the first step is configured to design the analog beamforming matrix by extracting dominant eigenvectors through eigenvalue decomposition of virtual analog beamforming matrixes for the subcarriers.

12 . The wideband extremely large array antenna system of claim 11 , wherein the first step is configured to:
acquire channels of the near-field and the far-field for each of the subcarriers by using the oblique projection matrixes; acquire individual analog beamforming matrix for each of the subcarriers by accumulating virtual analog beamforming matrixes for each of the subcarriers in response to the channels and applying singular value decomposition; and design the analog beamforming matrix by extracting dominant eigenvectors through eigenvalue decomposition of individual analog beamforming matrixes of the subcarriers.

13 . The wideband extremely large array antenna system of claim 9 , wherein the first step is configured to extract many dominant eigenvectors as the number of RF chains.

14 . The wideband extremely large array antenna system of claim 13 , wherein the second step is configured to design the baseband beamforming matrix by using the dominant eigenvectors.

15 . The wideband extremely large array antenna system of claim 9 , wherein the wideband extremely large array antenna system is configured to, after the second step, align data streams between the transmitter and the receiver through singular value decomposition.

16 . The wideband extremely large array antenna system of claim 9 , wherein the transmitter uses RF chains less than or equal to the number of the transmit antennas, and
the receiver uses RF chains less than or equal to the number of the receiving antennas.

17 . A non-transitory computer-readable recording medium in which a computer program is stored for a wideband extremely large array antenna system to execute an OFDM-based hybrid beamforming method, wherein the method comprises:
designing a common analog beamforming matrix for all subcarriers between a transmitter and a receiver; and designing a baseband beamforming matrix for each of the subcarriers.

18 . The non-transitory computer-readable recording medium of claim 17 , wherein in the wideband extremely large array antenna system, there is a hybrid-field composed of a near-field and a far-field between the transmitter and the receiver, and
wherein the designing the analog beamforming matrix comprises: acquiring oblique projection matrixes of the near-field and the far-field in channel information of the subcarriers by using arrival angle and departure angle information between the transmitter and the receiver; and designing the analog beamforming matrix by using the oblique projection matrixes.

19 . The non-transitory computer-readable recording medium of claim 17 , wherein the designing the analog beamforming matrix designs the analog beamforming matrix by extracting dominant eigenvectors through eigenvalue decomposition of virtual analog beamforming matrixes for the subcarriers.

20 . The non-transitory computer-readable recording medium of claim 19 , the designing the analog beamforming matrix by using the oblique projection matrixes comprises:
acquiring channels of the near-field and the far-field for each of the subcarriers by using the oblique projection matrixes; acquiring individual analog beamforming matrix for each of the subcarriers by accumulating virtual analog beamforming matrixes for each of the subcarriers in response to the channels and applying singular value decomposition; and designing the analog beam

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Park Hyuncheol
• Nam Hyunwoo

Classifications

• H04B7/0408

  using two or more beams, i.e. beam diversity · CPC title

• H04B7/0404

  the mobile station comprising multiple antennas, e.g. to provide uplink diversity · CPC title

• H04B7/084

  Equal gain combining, only phase adjustments (antenna beam scanning or forming by phase or amplitude control H01Q3/26, e.g. phased arrays) · CPC title

• H04B7/0682

  using phase diversity (e.g. phase sweeping) · CPC title

• H04B7/0617 Primary

  for beam forming · CPC title