US-12627336-B2 - Electronic device and method for wireless communication, and computer readable storage medium

US12627336B2US 12627336 B2US12627336 B2US 12627336B2US-12627336-B2

Abstract

The present disclosure provides an electronic device and method for wireless communication, and a computer readable storage medium. The electronic device comprises: a processing circuit, configured to estimate a first channel between a network node and an intelligent reflecting surface; pre-code, at least based on the estimated first channel, a plane wave signal sent by the network node, so that a channel model between the network node and a network terminal is equivalent to an orbital angular momentum channel model between the intelligent reflecting surface and the network terminal; and send the pre-coded plane wave signal.

Inventors

Bin SHENG
Li Zhang
Tingting FAN
Chen Sun

Assignees

Sony Group Corporation

Dates

Publication Date: 20260512
Application Date: 20230217
Priority Date: 20220224

Claims (18)

1 . An electronic apparatus for wireless communications, comprising: at least one processor; and at least one memory including computer program code, where the at least one memory and the computer program code are configured, with the at least one processor, to cause the electronic apparatus to: estimate a first channel between a network node and an intelligent reflecting surface; pre-code a plane wave signal transmitted by the network node at least based on the estimated first channel, to cause a channel model between the network node and a network terminal to be equivalent to an orbital angular momentum channel model between the intelligent reflecting surface and the network terminal; and transmit the pre-coded plane wave signal, wherein in a case that there is a light of sight between the network node and the network terminal, the at least one memory and the computer program code are configured, with the at least one processor, to cause the electronic apparatus to estimate a light of sight channel between the network node and the network terminal and perform pre-coding based on the estimated light of sight channel to eliminate an influence of the plane wave signal transmitted through the light of sight, and wherein in a case of said performing the pre-coding using a block diagonalization algorithm, the pre-coding comprises a first pre-coding and a second pre-coding, where the first pre-coding is used to eliminate the influence of the plane wave signal transmitted through the light of sight.
2 . The electronic apparatus according to claim 1 , wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the electronic apparatus to perform the pre-coding using a dirty paper algorithm and the block diagonalization algorithm.
3 . The electronic apparatus according to claim 2 , wherein a pre-coding matrix for the first pre-coding is a Null space of a channel matrix of the estimated light of sight channel.
4 . The electronic apparatus according to claim 1 , wherein the at least one memory and the computer program code are further configured, with the at least one processor, to cause the electronic apparatus to pre-code a pilot signal at least based on the estimated first channel, so that the network terminal determines an effective channel parameter between the intelligent reflecting surface and the network terminal based on reception of the pre-coded pilot signal, wherein the network terminal demodulates data based on the effective channel parameter.
5 . The electronic apparatus according to claim 1 , wherein in the case that there is the light of sight between the network node and the network terminal, the at least one memory and the computer program code are configured, with the at least one processor, to cause the electronic apparatus to pre-code a pilot signal based on the estimated first channel and the estimated light of sight channel, so that the network terminal determines an effective channel parameter between the intelligent reflecting surface and the network terminal based on reception of the pre-coded pilot signal, wherein the network terminal demodulates data based on the effective channel parameter.
6 . The electronic apparatus according to claim 1 , wherein reflection units of the intelligent reflecting surface are configured as a uniform circular array.
7 . The electronic apparatus according to claim 6 , wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the electronic apparatus to set a reflection coefficient matrix of the intelligent reflecting surface to be an identity matrix.
8 . The electronic apparatus according to claim 1 , wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the electronic apparatus to estimate the light of sight channel by: turning off all reflection units of the intelligent reflecting surface; transmitting pilot signals to the network terminal using respective antennas of the network node successively, the network terminal measuring the pilot signals and estimating the light of sight channel based on measurement results; and obtaining the estimated light of sight channel from the network terminal.
9 . The electronic apparatus according to claim 1 , wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the electronic apparatus to estimate the first channel using a dump access point arranged within a range not exceeding a predetermined distance from the intelligent reflecting surface.
10 . The electronic apparatus according to claim 9 , wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the electronic apparatus to estimate the first channel by: controlling the intelligent reflecting surface to turn on a reflection unit and turn off remaining reflection units; controlling the dump access point to transmit a pilot signal to the intelligent reflecting surface; receiving the pilot signal reflected by the intelligent reflecting surface and performing channel estimation; and performing the above mentioned steps for each reflection unit of the intelligent reflecting surface, so as to complete the estimating of the first channel.
11 . The electronic apparatus according to claim 1 , wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the electronic apparatus to estimate the first channel based on virtual full duplex measurement.
12 . The electronic apparatus according to claim 11 , wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the electronic apparatus to estimate the first channel by: turning off all reflection units of the intelligent reflecting surface, transmitting a pilot signal using a first antenna of the network node and receiving the pilot signal using remaining antennas of the network node, to estimate ambient reflection; for each antenna of the network node, controlling the intelligent reflecting surface to turn on respective reflection units successively, transmitting a pilot signal using the antenna of the network node and receiving the pilot signal using the remaining antennas of the network node, to estimate dual-link cascaded channels from the antenna to the remaining antennas via the reflection unit of the intelligent reflecting surface based on the estimated ambient reflection; and estimating the first channel based on all the estimated dual-link cascaded channels.
13 . The electronic apparatus according to claim 1 , wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the electronic apparatus to estimate the first channel based on measurement of device to device communication.
14 . The electronic apparatus according to claim 13 , wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the electronic apparatus estimate the first channel by: controlling the intelligent reflecting surface to successively turn on respective reflection units; a first device transmitting a pilot signal to the intelligent reflecting surface, an antenna of the network node receiving the pilot signal reflected by the reflection unit of the intelligent reflecting surface and estimating a first cascaded channel from the first device to the antenna of the network node via the reflection unit of the intelligent reflecting surface; a second device transmitting a pilot signal to the intelligent reflecting surface, an antenna of the network node receiving the pilot signal reflected by the reflection unit of the intelligent reflecting surface and estimating a second cascaded channel from the second device to the antenna of the network node via the reflection unit of the intelligent reflecting surface; the first device transmitting a pilot signal to the intelligent reflecting surface, the reflected pilot signal being received by the second device, the second device estimating a third cascaded channel from the first device to the second device via the reflection unit of the intelligent reflecting surface, and the processing circuitry obtaining the estimated third cascaded channel from the second device; estimating a channel from the reflection unit of the intelligent reflecting surface to the antenna of the network node based on the first cascaded channel, the second cascaded channel and the third cascaded channel; and obtaining estimation of the first channel based on estimated channels from respective reflection units of the intelligent reflecting surface to respective antennas of the network node.
15 . A method for wireless communications, comprising: estimating a first channel between a network node and an intelligent reflecting surface; pre-coding a plane wave signal transmitted by the network node at least based on the estimated first channel, to cause a channel model between the network node and a network terminal to be equivalent to an orbital angular momentum channel model between the intelligent reflecting surface and the network terminal; and transmitting the pre-coded plane wave signal, wherein said estimating the first channel includes: turning off all reflection units of the intelligent reflecting surface, transmitting a pilot signal using a first antenna of the network node and receiving the pilot signal using remaining antennas of the network node, to estimate ambient reflection, for each antenna of the network node, controlling the intelligent reflecting surface to turn on respective reflection units successively, transmitting a pilot signal using the antenna of the network node and receiving the pilot signal using the remaining antennas of the network node, to estimate dual-link cascaded channels from the antenna to the remaining antennas via the reflection unit of the intelligent reflecting surface based on the estimated ambient reflection, and estimating the first channel based on all the estimated dual-link cascaded channels.
16 . The method for wireless communications according to claim 15 , further comprising, in a case that there is a light of sight between the network node and the network terminal, estimating a light of sight channel between the network node and the network terminal and performing pre-coding based on the estimated light of sight channel to eliminate an influence of the plane wave signal transmitted through the light of sight.
17 . A non-transitory computer-readable storage medium storing computer-executable instructions, which when executed by one or more processors, cause the one or more processors to implement a method for wireless communications comprising: estimating a first channel between a network node and an intelligent reflecting surface; and pre-coding a plane wave signal transmitted by the network node at least based on the estimated first channel, to cause a channel model between the network node and a network terminal to be equivalent to an orbital angular momentum channel model between the intelligent reflecting surface and the network terminal, wherein said estimating the first channel includes: controlling the intelligent reflecting surface to successively turn on respective reflection units, a first device transmitting a pilot signal to the intelligent reflecting surface, an antenna of the network node receiving the pilot signal reflected by the reflection unit of the intelligent reflecting surface and estimating a first cascaded channel from the first device to the antenna of the network node via the reflection unit of the intelligent reflecting surface, a second device transmitting a pilot signal to the intelligent reflecting surface, an antenna of the network node receiving the pilot signal reflected by the reflection unit of the intelligent reflecting surface and estimating a second cascaded channel from the second device to the antenna of the network node via the reflection unit of the intelligent reflecting surface, the first device transmitting a pilot signal to the intelligent reflecting surface, the reflected pilot signal being received by the second device, the second device estimating a third cascaded channel from the first device to the second device via the reflection unit of the intelligent reflecting surface, and the processing circuitry obtaining the estimated third cascaded channel from the second device, estimating a channel from the reflection unit of the intelligent reflecting surface to the antenna of the network node based on the first cascaded channel, the second cascaded channel and the third cascaded channel, and obtaining estimation of the first channel based on estimated channels from respective reflection units of the intelligent reflecting surface to respective antennas of the network node.
18 . The non-transitory computer-readable storage medium according to claim 17 , wherein the method further comprises, in a case that there is a light of sight between the network node and the network terminal, estimating a light of sight channel between the network node and the network terminal and performing pre-coding based on the estimated light of sight channel to eliminate an influence of the plane wave signal transmitted through the light of sight.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application is based on PCT filing PCT/CN2023/076697, filed on Feb. 17, 2023, which claims priority to Chinese Patent Application No. 202210177126.0, titled “ELECTRONIC DEVICE AND METHOD FOR WIRELESS COMMUNICATION, AND COMPUTER READABLE STORAGE MEDIUM”, filed on Feb. 24, 2022 with the China National Intellectual Property Administration, each are incorporated herein by reference in its entirety. FIELD The present disclosure relates to the technical field of wireless communications, and in particular to orbital angular momentum (OAM) communication technology using a large intelligent reflecting surface (LIS). More particularly, the present disclosure relates to an electronic apparatus and a method for wireless communications, and a computer-readable storage medium. BACKGROUND Electromagnetic waves have both linear momentum and angular momentum. The angular momentum may be decomposed into a spin angular momentum (SAM) and an orbital angular momentum (OAM). The OAM is a result of a change of a phase of a wave relative to an azimuth θ around a propagation axis of the wave. The change results in a spiral phase distribution (Φ=l*θ), where l represents the number of OAM modes and refers to the number of complete phase rotations within one wavelength. Due to orthogonality between OAM modes with different integer mode numbers, mode division multiplexing (MDM) making use of OAM is considered to be applicable to future wireless communications. As an additional degree of freedom, the improvement of spectral efficiency brought by OAM and the potential of OAM in communications attract extensive attentions. The LIS is a completely new revolutionary technology. A large number of low-cost passive reflective components are integrated on a plane to intelligently reconfigure a wireless propagation environment, so as to significantly improve the performance of a wireless communication network. SUMMARY In the following, an overview of the present disclosure is given simply to provide basic understanding to some aspects of the present disclosure. It should be understood that this overview is not an exhaustive overview of the present disclosure. It is not intended to determine a critical part or an important part of the present disclosure, nor to limit the scope of the present disclosure. An object of the overview is only to give some concepts in a simplified manner, which serves as a preface of a more detailed description described later. According to an aspect of the present disclosure, an electronic apparatus for wireless communications is provided. The electronic apparatus includes processing circuitry. The processing circuitry is configured to: estimate a first channel between a network node and an intelligent reflecting surface; pre-code a plane wave signal transmitted by the network node at least based on the estimated first channel, to cause a channel model between the network node and a network terminal to be equivalent to an orbital angular momentum channel model between the intelligent reflecting surface and the network terminal; and transmit the pre-coded plane wave signal. According to another aspect of the present disclosure, a method for wireless communications is provided. The method includes: estimating a first channel between a network node and an intelligent reflecting surface; pre-coding a plane wave signal transmitted by the network node at least based on the estimated first channel, to cause a channel model between the network node and a network terminal to be equivalent to an orbital angular momentum channel model between the intelligent reflecting surface and the network terminal; and transmitting the pre-coded plane wave signal. With the electronic apparatus and the method according to the above aspects of the present disclosure, the plane wave signal is pre-coded based on the estimation of the first channel, which enables to realize the OAM communication between the network terminal supporting OAM communication and the network node not provided with the OAM antenna by means of the LIS. According to other aspects of the present disclosure, there are further provided computer program codes and computer program products for implementing the methods for wireless communications above, and a computer-readable storage medium having recorded thereon the computer program codes for implementing the methods for wireless communications described above. These and other advantages of the present disclosure will be more apparent from the following detailed description of preferred embodiments of the present disclosure in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS To further set forth the above and other advantages and features of the present disclosure, detailed description will be made in the following taken in conjunction with accompanying drawings in which identical or like reference signs designate identical or like components. The