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Method and device for enhancing power of signal in wireless communication … — Samsung Electronics Co., Ltd. (US11626909B2)

Samsung Electronics Co., Ltd. · Google Patents

Google Patents · Patents · License: Open Access

ltd.samsungelectronicsco.

patent, google patents, intellectual property, US11626909B2, Samsung Electronics Co., Ltd., Sarvendranath RIMALAPUDI, en, 2023

ABSTRACT

Abstract

A method for enhancing receiving signal power at a receiver is provided. The method includes estimating a channel gain by transmitting a pilot signal to the receiver through each antenna from a plurality of antennas of a transmitter and an IRS, determining an antenna selection metric based on the channel gain in transmitting the pilot signal to the receiver through each antenna of the transmitter and the IRS, identifying an antenna from the plurality of antennas that causes to provide the largest antenna selection metric, determining a reflection coefficient for each reflector of the IRS based on the identified antenna, configuring the reflectors of the IRS with the reflection coefficient, and transmitting the signal to the receiver through the identified antenna and the configured reflectors.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation application of International application No. PCT/KR2021/014249, filed on Oct. 14, 2021, which is based on and claims the benefit of an Indian provisional patent application number 202041044904, filed on Oct. 15, 2020 in the Indian Patent Office, and of an Indian Complete patent application number 202041044904, filed on Sep. 30, 2021 in the Indian Patent Office, the disclosure of each of which is incorporated by reference herein in its entirety.

FIELD OF INVENTION

The disclosure relates to a wireless communication system. More particularly, the disclosure relates to a method and a device for enhancing power of a signal in the wireless communication system using an intelligent reflecting surface (IRS).

BACKGROUND

Considering the development of wireless communication from generation to generation, the technologies have been developed mainly for services targeting humans, such as voice calls, multimedia services, and data services. Following the commercialization of 5G (5th-generation) communication systems, it is expected that the number of connected devices will exponentially grow. Increasingly, these will be connected to communication networks. Examples of connected things may include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machines, and factory equipment. Mobile devices are expected to evolve in various form-factors, such as augmented reality glasses, virtual reality headsets, and hologram devices. In order to provide various services by connecting hundreds of billions of devices and things in the 6G (6th-generation) era, there have been ongoing efforts to develop improved 6G communication systems. For these reasons, 6G communication systems are referred to as beyond-5G systems.

The 6G communication systems, which are expected to be commercialized around 2030, will have a peak data rate of tera (1,000 giga)-level bps and a radio latency less than 100 Î¼sec, and thus will be 50 times as fast as 5G communication systems and have the 1/10 radio latency thereof.

In order to accomplish such a high data rate and an ultra-low latency, it has been considered to implement the 6G communication systems in a terahertz band (for example, 95 GHz to 3THz bands). It is expected that, due to severer path loss and atmospheric absorption in the terahertz bands than those in mmWave bands introduced in 5G, technologies capable of securing the signal transmission distance (that is, coverage) will become more crucial. It is necessary to develop, as major technologies for securing the coverage, radio frequency (RF) elements, antennas, novel waveforms having a better coverage than orthogonal frequency division multiplexing (OFDM), beamforming and massive multiple input multiple output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, and multiantenna transmission technologies such as large-scale antennas. In addition, there has been ongoing discussion on new technologies for improving the coverage of terahertz-band signals, such as metamaterial-based lenses and antennas, orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS).

Moreover, in order to improve the spectral efficiency and the overall network performances, the following technologies have been developed for the 6G communication systems: a full-duplex technology for enabling an uplink transmission and a downlink transmission to simultaneously use the same frequency resource at the same time; a network technology for utilizing satellites, high-altitude platform stations (HAPS), and the like in an integrated manner; an improved network structure for supporting mobile base stations and the like and enabling network operation optimization and automation and the like; a dynamic spectrum sharing technology via collison avoidance based on a prediction of spectrum usage; an use of artificial intelligence (AI) in wireless communication for improvement of overall network operation by utilizing AI from a designing phase for developing 6G and internalizing end-to-end AI support functions; and a next-generation distributed computing technology for overcoming the limit of UE computing ability through reachable super-high-performance communication and computing resources (such as mobile edge computing (MEC), clouds, and the like) over the network. In addition, through designing new protocols to be used in the 6G communication systems, developing mecahnisms for implementing a hardware-based security environment and safe use of data, and developing technologies for maintaining privacy, attempts to strengthen the connectivity between devices, optimize the network, promote softwarization of network entities, and increase the openness of wireless communications are continuing.

It is expected that research and development of the 6G communication systems in hyper-connectivity, including person to machine (P2M) as well as machine to machine (M2M), will allow the next hyper-connected experience. Particularly, it is expected that services such as truly immersive extended reality (XR), high-fidelity mobile hologram, and digital replica could be provided through the 6G communication systems. In addition, services such as remote surgery for security and reliability enhancement, industrial automation, and emergency response will be provided through the 6G communication systems such that the technologies could be applied in various fields such as industry, medical care, automobiles, and home appliances.

An intelligent reflecting surface (IRS) is being envisioned as an energy efficient device for assisting 6th generation (6G) wireless communication systems in delivering a signal from a transmitter to a receiver. The IRS is also called as a reconfigurable intelligent surface (RIS). The IRS doesn't contain active components like radio frequency (RF) chains (e.g., amplifiers, mixers, filters, signal converters, or the like) that consume electric power. Hence, energy consumption of the IRS is very low. The IRS is a digitally-controlled meta surface with many low-cost passive reflectors, such as phase shifters and printed dipoles that reflect the signal transmitted from the transmitter towards the receiver for improving power of the signal receiving at the receiver at low cost. However, while reflecting the signal towards the receiver, the IRS indices an amplitude/phase shift to the signal, where the amplitude/phase shift can be controlled by an IRS controller. The IRS reflectors enable passive beamforming of the signal receives from the transmitter to improve the power of the signal receiving at the receiver. Similar to the IRS, transmit antenna selection (AS) is a traditional technology that improves energy and cost-efficiency by reducing lot of RF chains at the transmitter. According to the transmit AS, the transmitter selects a subset of antennas of the transmitter and connects them to available RF chains of the transmitter, which are smaller in number than antennas of the transmitter. The transmit AS achieves full diversity with fewer RF chains.

Several techniques are proposed to collaborate active beamforming (i.e., transmit beamforming) at the transmitter using the transmit AS and the passive beamforming at the IRS for improving the power of the signal receiving at the receiver. While performing active beamforming, the transmitter should monitor changes in a channel between the transmitter and the receiver due to presence of reflections of transmitted signal from the IRS. Further, the IRS with the passive beamforming needs to be configured with reflection coefficients to maximize the power of the signal receiving at the receiver.

In an existing method, a local optimal solution is developed in using an alternating optimization technique to minimize a transmit power at the transmitter. Different optimization techniques are currently existing to maximize the power of the signal receiving at the receiver. A fixed point iteration method is an existing method and a semi-definite relaxation (SDR) based technique that yields an approximate solution. Alternatively, a conjugate-gradient based manifold optimization technique, which converges to a local optimum solution that improves performance compared to the SDR based technique. Furthermore, a branch-and-bound method, that converges to a globally optimal solution, that has the performance of the manifold based method which is close to an optimal performance with lower computational complexity. All these existing methods include assuming a channel state information (CSI) at both the transmitter and the IRS, which is practically challenging to obtain due to passive nature of the IRS reflectors. Moreover, the existing methods are focused on beamforming at the transmitter, which needs multiple RF chains same as a number of antennas for transmission. Thus, it is desired to provide a best solution is needed for maximizing the power of the signal receiving at the receiver by incorporating the antenna subset selection and the passive beamforming.

The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure.

SUMMARY

Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide a method and a device for enhancing power of a signal receiving at a receiver using an IRS. The method improves system performance with low hardware cost at the transmitter by assisting transmit antenna selection (AS) with passive beamforming at the IRS. The system performance is improved by performing optimal antenna subset selection, transmit beamforming at the transmitter and passive beamforming at the IRS to maximize the power of the signal received at the received.

Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.

In accordance with an aspect of the disclosure, a method for enhancing power of a signal receiving at a receiver of a wireless communication system with an IRS is provided. The method includes estimating, by a transmitter of the wireless communication system, a channel gain by transmitting a pilot signal to the receiver through each antenna in a plurality of antennas of the transmitter and the IRS, determining, by the transmitter, an antenna selection metric based on the channel gain in transmitting the pilot signal to the receiver through each antenna in the plurality of antennas of the transmitter and the IRS, identifying, by the transmitter, an antenna from the plurality of antennas that causes to provide the largest antenna selection metric, determining, by the transmitter, a reflection coefficient for each reflector of the IRS based on the identified antenna, configuring, by the transmitter, the reflectors of the IRS with the reflection coefficient, and transmitting, by the transmitter, the signal to the receiver through the identified antenna and the configured reflectors.

In accordance with another aspect of the disclosure, a method for enhancing power of the signal receiving at a receiver of the wireless communication system with the IRS is provided. The method includes estimating, by the receiver, the channel gain by receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS of the wireless communication system, determining, by the receiver, the antenna selection metric based on the channel gain in receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS, identifying, by the receiver, the antenna from the plurality of antennas that causes to provide the largest antenna selection metric, determining, by the receiver, the reflection coefficient for each reflector of the IRS based on the identified antenna, and reporting, by the receiver, the identified antenna, and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

In accordance with another aspect of the disclosure, a method for enhancing power of the signal receiving at a receiver of the wireless communication system with the IRS. The method includes estimating, by the transmitter of the wireless communication system, a first channel gain by transmitting the pilot signal to the receiver through each antenna in the plurality of antennas of the transmitter and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as zero, estimating, by the transmitter, a second channel gain by transmitting the pilot signal to the receiver through each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one, determining, by the transmitter, a difference between the second channel gain and the first channel gain for each antenna, identifying, by the transmitter, the antenna of the plurality of antennas that has a maximum of sum of a magnitude of the first channel gain and a magnitude of the difference between the second channel gain and the first channel gain, determining, by the transmitter, the reflection coefficient for each reflector of the IRS by sending each pilot signal in a set of pilot signals through the identified antenna and the IRS, wherein a number of the pilot signals in the set of pilot signals is equal to a number of the reflectors in the IRS, and transmitting, by the transmitter, the signal to the receiver through the identified antenna and the IRS based on the reflection coefficient.

In accordance with another aspect of the disclosure, a method for enhancing power of the signal receiving at a receiver of the wireless communication system with the IRS is provided. The method includes estimating, by the receiver, the first channel gain by receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS of the wireless communication system, wherein the reflection coefficient for each reflector of the IRS is set as zero, estimating, by the receiver, the second channel gain by receiving the pilot signal from each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one, determining, by the receiver, the difference between the second channel gain and the first channel gain for each antenna, identifying, by the receiver, the antenna of the plurality of antennas that has the maximum of sum of the magnitude of first channel gain and the magnitude of the difference between the second channel gain and the first channel gain, determining, by the receiver, the reflection coefficient for each reflector of the IRS by receiving each pilot signal in the set of pilot signals from the identified antenna and the IRS, wherein the number of the pilot signals in the set of pilot signals is equal to the number of the reflectors in the IRS, and reporting, by the receiver, the identified antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

In accordance with another aspect of the disclosure, a method for enhancing power of the signal receiving at a receiver of the wireless communication system with the IRS is provided. The method includes estimating, by the transmitter of the wireless communication system, the channel gain by transmitting the pilot signal to the receiver through a set of antennas in the plurality of antennas of the transmitter and the IRS, determining, by the transmitter, the antenna selection metric based on the channel gain in transmitting the pilot signal to the receiver through the set of antennas in the plurality of antennas of the transmitter and the IRS, identifying, by the transmitter, the set of antennas from the plurality of antennas that causes to provide the largest antenna selection metric, determining, by the transmitter, the reflection coefficient for each reflector of the IRS based on the set of antennas, configuring, by the transmitter, the reflectors of the IRS with the reflection coefficient, determining, by the transmitter, an optimal beamforming required for transmitting the signal from the set of antennas based on the reflection coefficient and the set of antennas, transmitting, by the transmitter, the signal to the receiver through the configured reflectors and the set of antennas based on the optimal beamforming, estimating, by the receiver, the channel gain by receiving the pilot signal from the set of antennas in the plurality of antennas of the transmitter and the IRS of the wireless communication system, determining, by the receiver, the antenna selection metric based on the channel gain in receiving the pilot signal from t

CROSS-REFERENCE TO RELATED APPLICATION(S)

FIELD OF INVENTION

BACKGROUND

SUMMARY

Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.

In accordance with another aspect of the disclosure, a method for enhancing power of the signal receiving at a receiver of the wireless communication system with the IRS is provided. The method includes estimating, by the receiver, the channel gain by receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS of the wireless communication system, determining, by the receiver, the antenna selection metric based on the channel gain in receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS, identifying, by the receiver, the antenna from the plurality of antennas that causes to provide the largest antenna selection metric, determining, by the receiver, the reflection coefficient for each reflector of the IRS based on the identified antenna, and reporting, by the receiver, the identified antenna, and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

In accordance with another aspect of the disclosure, a method for enhancing power of the signal receiving at a receiver of the wireless communication system with the IRS is provided. The method includes estimating, by the receiver, the first channel gain by receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS of the wireless communication system, wherein the reflection coefficient for each reflector of the IRS is set as zero, estimating, by the receiver, the second channel gain by receiving the pilot signal from each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one, determining, by the receiver, the difference between the second channel gain and the first channel gain for each antenna, identifying, by the receiver, the antenna of the plurality of antennas that has the maximum of sum of the magnitude of first channel gain and the magnitude of the difference between the second channel gain and the first channel gain, determining, by the receiver, the reflection coefficient for each reflector of the IRS by receiving each pilot signal in the set of pilot signals from the identified antenna and the IRS, wherein the number of the pilot signals in the set of pilot signals is equal to the number of the reflectors in the IRS, and reporting, by the receiver, the identified antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

In accordance with another aspect of the disclosure, a method for enhancing power of the signal receiving at a receiver of the wireless communication system with the IRS is provided. The method includes estimating, by the transmitter of the wireless communication system, the channel gain by transmitting the pilot signal to the receiver through a set of antennas in the plurality of antennas of the transmitter and the IRS, determining, by the transmitter, the antenna selection metric based on the channel gain in transmitting the pilot signal to the receiver through the set of antennas in the plurality of antennas of the transmitter and the IRS, identifying, by the transmitter, the set of antennas from the plurality of antennas that causes to provide the largest antenna selection metric, determining, by the transmitter, the reflection coefficient for each reflector of the IRS based on the set of antennas, configuring, by the transmitter, the reflectors of the IRS with the reflection coefficient, determining, by the transmitter, an optimal beamforming required for transmitting the signal from the set of antennas based on the reflection coefficient and the set of antennas, transmitting, by the transmitter, the signal to the receiver through the configured reflectors and the set of antennas based on the optimal beamforming, estimating, by the receiver, the channel gain by receiving the pilot signal from the set of antennas in the plurality of antennas of the transmitter and the IRS of the wireless communication system, determining, by the receiver, the antenna selection metric based on the channel gain in receiving the pilot signal from the set of antennas in the plurality of antennas of the transmitter and the IRS, identifying, by the receiver, the set of antennas from the plurality of antennas that causes to provide the largest antenna selection metric, determining, by the receiver, the reflection coefficient for each reflector of the IRS based on the identified set of antennas, and reporting, by the receiver, the identified set of antennas and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified set of antennas.

In accordance with another aspect of the disclosure, a method for enhancing power of the signal receiving at a receiver of the wireless communication system with the IRS is provided. The method includes estimating, by the transmitter of the wireless communication system, the first channel gain by transmitting the pilot signal to the receiver through each antenna in the plurality of antennas of the transmitter and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as zero, estimating, by the transmitter, the second channel gain by transmitting the pilot signal to the receiver through each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one, determining, by the transmitter, the difference between the second channel gain and the first channel gain for each antenna, sorting, by the transmitter, each antenna in decreasing order of the difference between the second channel gain and the first channel gain for each antenna, selecting, by the transmitter, top n number of antenna from the sorted antennas as the set of antennas, transmitting, by the transmitter, the pilot signal through the selected set of antennas, determining, by the transmitter, the reflection coefficient for each reflector of the IRS based on the set of antennas, configuring, by the transmitter, the reflectors of the IRS with the reflection coefficient, determining, by the transmitter, the optimal beamforming required for transmitting the signal from the set of antennas based on the reflection coefficient and the set of antennas, and transmitting, by the transmitter, the signal to the receiver through the configured reflectors and the set of antennas based on the optimal beamforming.

In accordance with another aspect of the disclosure, a method for enhancing power of the signal receiving at a receiver of the wireless communication system with the IRS is provided. The method includes estimating, by the receiver, the first channel gain by receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS of the wireless communication system, wherein the reflection coefficient for each reflector of the IRS is set as zero, estimating, by the receiver, the second channel gain by receiving the pilot signal from each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one, determining, by the receiver, the difference between the second channel gain and the first channel gain for each antenna, sorting, by the receiver, each antenna in decreasing order of the difference between the second channel gain and the first channel gain for each antenna, selecting, by the receiver, top n number of antenna from the sorted antennas as the set of antennas, determining, by the receiver, the reflection coefficient for each reflector of the IRS based on the set of antennas and the pilot signal transmitted by the transmitter, And reporting, by the receiver, the selected top n number of antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

In accordance with another aspect of the disclosure, a receiver for enhancing power of the signal receiving from the transmitter and the IRS is provided. The receiver includes a memory, a communicator being equipped with at least one receive antennas and at least one receive radio frequency (RF) chain, and a processing circuitry, coupled with the memory and the communicator. The processing circuitry is configured to estimate the channel gain by receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS, determine the antenna selection metric based on the channel gain in receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS, identify the antenna from the plurality of antennas that causes to provide the largest antenna selection metric, determine the reflection coefficient for each reflector of the IRS based on the identified antenna, and report the identified antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

In accordance with another aspect of the disclosure, a transmitter for enhancing power of the signal receiving at a receiver of the wireless communication system with the IRS is provided. The transmitter includes a memory, a communicator being equipped with a plurality of antennas and a plurality of radio frequency (RF) chains, and a processing circuitry, coupled with the memory and the communicator. The processing circuitry is configured to estimate the first channel gain by transmitting the pilot signal to the receiver through each antenna in the plurality of antennas of the transmitter and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as zero, estimate the second channel gain by transmitting the pilot signal to the receiver through each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one, determine the difference between the second channel gain and the first channel gain for each antenna, identify the antenna of the plurality of antennas that has the maximum of sum of the magnitude of the first channel gain and the magnitude of the difference between the second channel gain and the first channel gain, determine the reflection coefficient for each reflector of the IRS by sending each pilot signal in the set of pilot signals through the identified antenna and the IRS, wherein the number of the pilot signals in the set of pilot signals is equal to the number of the reflectors in the IRS, and transmit the signal to the receiver through the identified antenna and the IRS based on the reflection coefficient.

In accordance with another aspect of the disclosure, a receiver for enhancing power of the signal receiving from the transmitter and the IRS is provided. The receiver includes a memory, a communicator being equipped with at least one receive antennas and at least one receive radio frequency (RF) chain, and a processing circuitry, coupled with the memory and the communicator. The processing circuitry is configured to estimate the first channel gain by receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as zero, estimate the second channel gain by receiving the pilot signal from each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one, determine the difference between the second channel gain and the first channel gain for each antenna, identify the antenna of the plurality of antennas that has the maximum of sum of the magnitude of first channel gain and the magnitude of the difference between the second channel gain and the first channel gain, determine the reflection coefficient for each reflector of the IRS by receiving each pilot signal in the set of pilot signals from the identified antenna and the IRS, wherein the number of the pilot signals in the set of pilot signals is equal to the number of the reflectors in the IRS, and report the identified antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

In accordance with another aspect of the disclosure, a transmitter for enhancing power of the signal receiving at a receiver of the wireless communication system with the IRS is provided. The transmitter includes a memory, a communicator being equipped with a plurality of antennas and a plurality of radio frequency (RF) chains, and a processing circuitry, coupled with the memory and the communicator. The processing circuitry is configured to estimate the channel gain by transmitting the pilot signal to the receiver through the set of antennas in the plurality of antennas of the transmitter and the IRS, determine the antenna selection metric based on the channel gain in transmitting the pilot signal to the receiver through the set of antennas in the plurality of antennas of the transmitter and the IRS, identify the set of antennas from the plurality of antennas that causes to provide the largest antenna selection metric, determine the reflection coefficient for each reflector of the IRS based on the set of antennas, configure the reflectors of the IRS with the reflection coefficient, determine an optimal beamforming required for transmitting the signal from the set of antennas based on the reflection coefficient and the set of antennas, and transmit the signal to the receiver through the configured reflectors and the set of antennas based on the optimal beamforming.

In accordance with another aspect of the disclosure, a receiver for enhancing power of the signal receiving from the transmitter and the IRS is provided. The receiver includes a memory, a communicator being equipped with at least one receive antennas and at least one receive radio frequency (RF) chain, and a processing circuitry, coupled with the memory and the communicator. The processing circuitry is configured to estimate the channel gain by receiving the pilot signal from the set of antennas in the plurality of antennas of the transmitter and the IRS, determine the antenna selection metric based on the channel gain in receiving the pilot signal from the set of antennas in the plurality of antennas of the transmitter and the IRS, identify the set of antennas from the plurality of antennas that causes to provide the largest antenna selection metric, determine the reflection coefficient for each reflector of the IRS based on the identified set of antennas, and report the identified set of antennas and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified set of antennas.

In accordance with another aspect of the disclosure, a transmitter for enhancing power of the signal receiving at a receiver of the wireless communication system with the IRS is provided. The transmitter includes a memory, a communicator being equipped with a plurality of antennas and a plurality of radio frequency (RF) chains, and a processing circuitry, coupled with the memory and the communicator. The processing circuitry is configured to estimate the first channel gain by transmitting the pilot signal to the receiver through each antenna in the plurality of antennas of the transmitter and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as zero, estimate the second channel gain by transmitting the pilot signal to the receiver through each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one, determine the difference between the second channel gain and the first channel gain for each antenna, sort each antenna in decreasing order of the difference between the second channel gain and the first channel gain for each antenna, select top n number of antenna from the sorted antennas as the set of antennas, transmit the pilot signal through the selected set of antennas, determine the reflection coefficient for each reflector of the IRS based on the set of antennas, configure the reflectors of the IRS with the reflection coefficient, determine the optimal beamforming required for transmitting the signal from the set of antennas based on the reflection coefficient and the set of antennas, and transmit the signal to the receiver through the configured reflectors and the set of antennas based on the optimal beamforming.

In accordance with another aspect of the disclosure, a receiver for enhancing power of the signal receiving from the transmitter and the IRS is provided. The receiver includes a memory, a communicator being equipped with at least one receive antennas and at least one receive radio frequency (RF) chain, and a processing circuitry, coupled with the memory and the communicator. The processing circuitry is configured to estimate the first channel gain by receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as zero, estimate the second channel gain by receiving the pilot signal from each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one, determine the difference between the second channel gain and the first channel gain for each antenna, sort each antenna in decreasing order of the difference between the second channel gain and the first channel gain for each antenna, select top n number of antenna from the sorted antennas as the set of antennas, determine the reflection coefficient for each reflector of the IRS based on the set of antennas and the pilot signal transmitted by the transmitter, and report the selected top n number of antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

BRIEF DESCRIPTION OF FIGURES

The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a block diagram of a wireless commination system for enhancing power of a signal receiving at a receiver with an intelligent reflecting surface (IRS) according to an embodiment of the disclosure;

FIG. 2 A is a flow diagram illustrating a method for enhancing power of a signal receiving at a receiver with an IRS according to an embodiment of the disclosure;

FIG. 2 B is a flow diagram illustrating a method for enhancing power of a signal receiving at a receiver with an IRS according to an embodiment of the disclosure;

FIG. 2 C is a flow diagram illustrating a method for enhancing power of a signal receiving at a receiver with an IRS according to an embodiment of the disclosure;

FIG. 2 D is a flow diagram illustrating a method for enhancing power of a signal receiving at a receiver with an IRS according to an embodiment of the disclosure;

FIG. 3 A is a flow diagram illustrating a method for enhancing power of a signal receiving at a receiver with an IRS according to an embodiment of the disclosure;

FIG. 3 B is a flow diagram illustrating a method for enhancing power of a signal receiving at a receiver with an IRS according to an embodiment of the disclosure;

FIG. 3 C is a flow diagram illustrating a method for enhancing power of a signal receiving at a receiver with an IRS according to an embodiment of the disclosure;

FIG. 3 D is a flow diagram illustrating a method for enhancing power of a signal receiving at a receiver with an IRS according to an embodiment of the disclosure;

FIG. 4 is a schematic diagram illustrating single antenna selection and passive beamforming for delivering the signal to a receiver according to an embodiment of the disclosure;

FIG. 5 A and FIG. 5 B are schematic diagrams illustrating a method of estimation of a direct link channel gain and a reflected link channel gain according to an embodiment of the disclosure;

FIG. 6 is a graphical diagram illustrating plotting of an average symbol error probability (SEP) as a function of a peak transmit power for different numbers of the IRS reflectors according to an embodiment of the disclosure;

FIG. 7 is a graphical diagram illustrating plotting of signal-to-noise ratio (SNR) at a receiver as a function of distance of the receiver from a transmitter for different number of the IRS reflectors according to an embodiment of the disclosure; and

FIG. 8 is a graphical diagram illustrating plotting of an average SEP as the function of a peak transmit power for different numbers of antennas at a transmitter according to an embodiment of the disclosure.

Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF INVENTION

The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various to specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the disclosure is provided for illustration purpose only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.

It is to be understood that the singular forms âa,â âan,â and âtheâ include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to âa component surfaceâ includes reference to one or more of such surfaces.

As is traditional in the field, embodiments may be described and illustrated in terms of blocks which carry out a described function or functions. These blocks, which may be referred to herein as managers, units, modules, hardware components or the like, are physically implemented by analog and/or digital circuits, such as logic gates, integrated circuits, microprocessors, microcontrollers, memory circuits, passive electronic components, active electronic components, optical components, hardwired circuits and the like, and may optionally be driven by firmware. The circuits may, for example, be embodied in one or more semiconductor chips, or on substrate supports, such as printed circuit boards and the like. The circuits constituting a block may be implemented by dedicated hardware, or by a processor (e.g., one or more programmed microprocessors and associated circuitry), or by a combination of dedicated hardware to perform some functions of the block and a processor to perform other functions of the block. Each block of the embodiments may be physically separated into two or more interacting and discrete blocks without departing from the scope of the disclosure. Likewise, the blocks of the embodiments may be physically combined into more complex blocks without departing from the scope of the disclosure.

The accompanying drawings are used to help easily understand various technical features and it should be understood that the embodiments presented herein are not limited by the accompanying drawings. As such, the disclosure should be construed to extend to any alterations, equivalents and substitutes in addition to those which are particularly set out in the accompanying drawings. Although the terms first, second, or the like, may be used herein to describe various elements, these elements should not be limited by these terms. These terms are generally only used to distinguish one element from another.

Notations: Scalars are denoted by lower-case letters. Vectors and matrices are denoted by boldface lower-case and capital letters, respectively. C mÃn denotes the set of all complex valued matrices of size mÃn and j=â{square root over (â1)}|a|, arg(a), and a* denote the absolute value, phase, and conjugate respectively of a complex number a. â¥xâ¥, x â and [x] n denote a 2-norm, conjugate transpose, and nth element of vector x.

Accordingly, the embodiments herein provide a method for enhancing power of a signal receiving at a receiver of a wireless communication system with an IRS. The method includes estimating, by a transmitter of the wireless communication system, a channel gain by transmitting a pilot signal to the receiver through each antenna in a plurality of antennas of the transmitter and the IRS. The method includes determining, by the transmitter, an antenna selection metric based on the channel gain in transmitting the pilot signal to the receiver through each antenna in the plurality of antennas of the transmitter and the IRS. The method includes identifying, by the transmitter, an antenna from the plurality of antennas that causes to provide the largest antenna selection metric. The method includes determining, by the transmitter, a reflection coefficient for each reflector of the IRS based on the identified antenna. The method includes configuring, by the transmitter, the reflectors of the IRS with the reflection coefficient. The method includes transmitting, by the transmitter, the signal to the receiver through the identified antenna and the configured reflectors.

Accordingly, the embodiments herein provide a method for enhancing power of the signal receiving at the receiver of the wireless communication system with the IRS. The method includes estimating, by the receiver, the channel gain by receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS of the wireless communication system. The method includes determining, by the receiver, the antenna selection metric based on the channel gain in receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS. The method includes identifying, by the receiver, the antenna from the plurality of antennas that causes to provide the largest antenna selection metric. The method includes determining, by the receiver, the reflection coefficient for each reflector of the IRS based on the identified antenna. The method includes reporting, by the receiver, the identified antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

Accordingly, the embodiments herein provide the method for enhancing power of the signal receiving at the receiver of the wireless communication system with the IRS. The method includes estimating, by the receiver, the first channel gain by receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS of the wireless communication system, wherein the reflection coefficient for each reflector of the IRS is set as zero. The method includes estimating, by the receiver, the second channel gain by receiving the pilot signal from each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one. The method includes determining, by the receiver, the difference between the second channel gain and the first channel gain for each antenna. The method includes identifying, by the receiver, the antenna of the plurality of antennas that has the maximum of sum of the magnitude of first channel gain and the magnitude of the difference between the second channel gain and the first channel gain. The method includes determining, by the receiver, the reflection coefficient for each reflector of the IRS by receiving each pilot signal in the set of pilot signals from the identified antenna and the IRS, wherein the number of the pilot signals in the set of pilot signals is equal to the number of the reflectors in the IRS. The method includes reporting, by the receiver, the identified antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

Accordingly, the embodiments herein provide a method for enhancing power of the signal receiving at the receiver of the wireless communication system with the IRS. The method includes estimating, by the transmitter of the wireless communication system, the channel gain by transmitting the pilot signal to the receiver through a set of antennas in the plurality of antennas of the transmitter and the IRS. The method includes determining, by the transmitter, the antenna selection metric based on the channel gain in transmitting the pilot signal to the receiver through the set of antennas in the plurality of antennas of the transmitter and the IRS. The method includes identifying, by the transmitter, the set of antennas from the plurality of antennas that causes to provide the largest antenna selection metric. The method includes determining, by the transmitter, the reflection coefficient for each reflector of the IRS based on the set of antennas. The method includes configuring, by the transmitter, the reflectors of the IRS with the reflection coefficient. The method includes determining, by the transmitter, an optimal beamforming required for transmitting the signal from the set of antennas based on the reflection coefficient and the set of antennas. The method includes transmitting, by the transmitter, the signal to the receiver through the configured reflectors and the set of antennas based on the optimal beamforming. The method includes estimating, by the receiver, the channel gain by receiving the pilot signal from the set of antennas in the plurality of antennas of the transmitter and the IRS of the wireless communication system. The method includes determining, by the receiver, the antenna selection metric based on the channel gain in receiving the pilot signal from the set of antennas in the plurality of antennas of the transmitter and the IRS. The method includes identifying, by the receiver, the set of antennas from the plurality of antennas that causes to provide the largest antenna selection metric. The method includes determining, by the receiver, the reflection coefficient for each reflector of the IRS based on the identified set of antennas. The method includes reporting, by the receiver, the identified set of antennas and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified set of antennas.

Accordingly, the embodiments herein provide a method for enhancing power of the signal receiving at the receiver of the wireless communication system with the IRS. The method includes estimating, by the transmitter of the wireless communication system, the first channel gain by transmitting the pilot signal to the receiver through each antenna in the plurality of antennas of the transmitter and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as zero. The method includes estimating, by the transmitter, the second channel gain by transmitting the pilot signal to the receiver through each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one. The method includes determining, by the transmitter, the difference between the second channel gain and the first channel gain for each antenna. The method includes sorting, by the transmitter, each antenna in decreasing order of the difference between the second channel gain and the first channel gain for each antenna. The method includes selecting, by the transmitter, top n number of antenna from the sorted antennas as the set of antennas. The method includes transmitting, by the transmitter, the pilot signal through the selected set of antennas. The method includes determining, by the transmitter, the reflection coefficient for each reflector of the IRS based on the set of antennas. The method includes configuring, by the transmitter, the reflectors of the IRS with the reflection coefficient. The method includes determining, by the transmitter, the optimal beamforming required for transmitting the signal from the set of antennas based on the reflection coefficient and the set of antennas. The method includes transmitting, by the transmitter, the signal to the receiver through the configured reflectors and the set of antennas based on the optimal beamforming.

Accordingly, the embodiments herein provide a method for enhancing power of the signal receiving at the receiver of the wireless communication system with the IRS. The method includes estimating, by the receiver, the first channel gain by receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS of the wireless communication system, wherein the reflection coefficient for each reflector of the IRS is set as zero. The method includes estimating, by the receiver, the second channel gain by receiving the pilot signal from each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one. The method includes determining, by the receiver, the difference between the second channel gain and the first channel gain for each antenna. The method includes sorting, by the receiver, each antenna in decreasing order of the difference between the second channel gain and the first channel gain for each antenna. The method includes selecting, by the receiver, top n number of antenna from the sorted antennas as the set of antennas. The method includes determining, by the receiver, the reflection coefficient for each reflector of the IRS based on the set of antennas and the pilot signal transmitted by the transmitter. The method includes reporting, by the receiver, the selected top n number of antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

Accordingly, the embodiments herein provide the transmitter for enhancing power of the signal receiving at the receiver of the wireless communication system with the IRS. The transmitter includes a memory, a communicator being equipped with a plurality of antennas and a plurality of radio frequency (RF) chains, and a processing circuitry, coupled with the memory and the communicator. The processing circuitry is configured for estimating the channel gain by transmitting the pilot signal to the receiver through each antenna in the plurality of antennas of the transmitter and the IRS. The processing circuitry is configured for determining the antenna selection metric based on the channel gain in transmitting the pilot signal to the receiver through each antenna in the plurality of antennas of the transmitter and the IRS. The processing circuitry is configured for identifying the antenna from the plurality of antennas that causes to provide the largest antenna selection metric. The processing circuitry is configured for determining the reflection coefficient for each reflector of the IRS based on the identified antenna. The processing circuitry is configured for configuring the reflectors of the IRS with the reflection coefficient. The processing circuitry is configured for transmitting the signal to the receiver through the identified antenna and the configured reflectors.

Accordingly, the embodiments herein provide the receiver for enhancing power of the signal receiving from the transmitter and the IRS. The receiver includes a memory, a communicator being equipped with at least one receive antennas and at least one receive radio frequency (RF) chain, and a processing circuitry, coupled with the memory and the communicator. The processing circuitry is configured for estimating the channel gain by receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS. The processing circuitry is configured for determining the antenna selection metric based on the channel gain in receiving the pilot signal from each antenna in the plurality of antennas of the transmitter and the IRS. The processing circuitry is configured for identifying the antenna from the plurality of antennas that causes to provide the largest antenna selection metric. The processing circuitry is configured for determining the reflection coefficient for each reflector of the IRS based on the identified antenna. The processing circuitry is configured for reporting the identified antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

Accordingly, the embodiments herein provide the transmitter for enhancing power of the signal receiving at the receiver of the wireless commun

CLAIMS

Claims ( 20 )

The invention claimed is:

1. A method for enhancing power of a signal in a wireless communication system using an intelligent reflecting surface (IRS) comprising reflectors, the method comprising:

estimating, by a transmitter of the wireless communication system, a channel gain by transmitting a pilot signal to a receiver through at least one antenna from a plurality of antennas of the transmitter and the IRS;

determining, by the transmitter, an antenna selection metric based on the channel gain in transmitting the pilot signal to the receiver through the at least one antenna from the plurality of antennas of the transmitter and the IRS;

identifying, by the transmitter, the at least one antenna from the plurality of antennas that causes to provide the largest antenna selection metric;

determining, by the transmitter, a reflection coefficient for each reflector of the IRS based on the identified antenna;

configuring, by the transmitter, the reflectors of the IRS with the reflection coefficient; and

transmitting, by the transmitter, the signal to the receiver through the at least one identified antenna and the configured reflectors.

2. The method of claim 1 , wherein the determining of the antenna selection metric comprises:

estimating, by the transmitter, a first channel gain by transmitting the pilot signal to the receiver through the at least one antenna from the plurality of antennas of the transmitter and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as zero;

estimating, by the transmitter, a second channel gain by transmitting the pilot signal to the receiver through the at least one antenna from the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one;

determining, by the transmitter, a difference between the second channel gain and the first channel gain for the at least one antenna; and

identifying, by the transmitter, the at least one antenna from the plurality of antennas that has a maximum of sum of a magnitude of the first channel gain and a magnitude of the difference between the second channel gain and the first channel gain.

3. The method of claim 2 ,

wherein the estimating, by the transmitter, the first channel gain by transmitting a pilot signal to the receiver through the at least one antenna from the plurality of antennas of the transmitter and the IRS, and

wherein the reflection coefficient for each reflector of the IRS is set as zero, comprises:

receiving, by the receiver, the pilot signal from the at least one antenna of the plurality of antennas of the transmitter, wherein the IRS is disabled,

determining, by the receiver, a location of the pilot signal based on a time and a frequency of the pilot signal, in response to receiving the pilot signal,

estimating, by the receiver, the first channel gain based on the pilot signal, and

reporting, by the receiver, the first channel gain to the transmitter.

4. The method of claim 2 ,

wherein the estimating, by the transmitter, the second channel gain by transmitting the pilot signal to the receiver through the at least one antenna from the plurality of antennas and the IRS, and

wherein the reflection coefficient for each reflector of the IRS is set as one, comprises:

receiving, by the receiver, the pilot signal from the at least one antenna of the plurality of antennas of the transmitter, wherein the IRS is enabled and the reflection coefficient is set as one,

determining, by the receiver, a location of the pilot signal based on a time and a frequency of the pilot signal, in response to receiving the pilot signal,

estimating, by the receiver, the second channel gain based on the pilot signal, and

reporting, by the receiver, the second channel gain to the transmitter.

5. The method of claim 1 , further comprising:

determining, by the transmitter, an optimal beamforming required for transmitting the signal from the at least one antenna based on the reflection coefficient and the at least one antenna; and

transmitting, by the transmitter, the signal to the receiver through the configured reflectors and the at least one antenna based on the optimal beamforming.

6. The method of claim 1 , wherein the estimating of the channel gain comprises:

receiving, by the receiver, the pilot signal from the at least one antenna of the plurality of antennas of the transmitter, wherein the IRS is disabled;

determining, by the receiver, a location of the pilot signal based on a time and a frequency of the pilot signal, in response to receiving the pilot signal;

estimating, by the receiver, the channel gain based on the pilot signal when the IRS is disabled;

receiving, by the receiver, the pilot signal from the at least one antenna of the plurality of antennas of the transmitter, wherein the IRS is enabled and the reflection coefficient is set as one;

estimating, by the receiver, the channel gain based on the pilot signal when the IRS is enabled; and

reporting, by the receiver, the channel gain estimated while the IRS is disabled and enabled to the transmitter.

7. The method of claim 1 , wherein the reflection coefficient comprises a phase shift (Î¸) and a magnitude of reflection loss (Î²).

8. The method of claim 1 , wherein the estimating of the channel gain comprises:

monitoring, by the transmitter, the channel gain estimated for the at least one antenna at various instant of time;

training, by the transmitter, a machine learning (ML) engine to learn the estimated channel gain; and

predicting, by the transmitter, the channel gain in transmitting the pilot signal to the receiver through the at least one antenna based on the learning using the ML engine.

9. The method of claim 1 , wherein the determining of the reflection coefficient for each reflector of the IRS comprises:

monitoring, by the transmitter, the reflection coefficient determined at various instant of time;

training, by the transmitter, a ML engine to learn the reflection coefficient determined at various instant of time; and

predicting, by the transmitter, the reflection coefficient for each reflector of the IRS based on the learning using the ML engine.

10. A method for enhancing power of a signal in a wireless communication system using an intelligent reflecting surface (IRS) comprising reflectors, the method comprising:

estimating, by a receiver, a channel gain by receiving a pilot signal from at least one antenna of a plurality of antennas of a transmitter and the IRS of the wireless communication system;

determining, by the receiver, an antenna selection metric based on the channel gain in receiving the pilot signal from the at least one antenna of the plurality of antennas of the transmitter and the IRS;

identifying, by the receiver, the at least one antenna from the plurality of antennas that causes to provide the largest antenna selection metric;

determining, by the receiver, a reflection coefficient for each reflector of the IRS based on the at least one identified antenna; and

reporting, by the receiver, the at least one identified antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the at least one identified antenna.

11. The method of claim 10 , wherein the estimating of the channel gain comprises:

receiving, by the receiver, the pilot signal from the at least one antenna of the plurality of antennas of the transmitter, wherein the IRS is disabled;

determining, by the receiver, a location of the pilot signal based on a time and a frequency of the pilot signal;

estimating, by the receiver, the channel gain based on the pilot signal when the IRS is disabled;

receiving, by the receiver, the pilot signal from the at least one antenna of the plurality of antennas of the transmitter, wherein the IRS is enabled and the reflection coefficient is set as one; and

estimating, by the receiver, the channel gain based on the pilot signal when the IRS is enabled.

12. The method of claim 10 , wherein the determining of the antenna selection metric comprises:

estimating, by the receiver, a first channel gain by receiving the pilot signal from the at least one antenna of the plurality of antennas of the transmitter and the IRS of the wireless communication system, wherein the reflection coefficient for each reflector of the IRS is set as zero;

estimating, by the receiver, a second channel gain by receiving the pilot signal from the at least one antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one;

determining, by the receiver, a difference between the second channel gain and the first channel gain for the at least one antenna; and

identifying, by the receiver, the at least one antenna of the plurality of antennas that has a maximum of sum of a magnitude of first channel gain and a magnitude of the difference between the second channel gain and the first channel gain.

13. The method of claim 10 , wherein the estimating of the channel gain comprises:

monitoring, by the receiver, the channel gain estimated for the at least one antenna on various instant of time;

training, by the receiver, a Machine Learning (ML) engine to learn the estimated channel gain; and

predicting, by the receiver, the channel gain in transmitting the pilot signal to the receiver through the at least one antenna based on the learning using the ML engine.

14. The method of claim 10 , wherein the determining of the reflection coefficient for each reflector of the IRS comprises:

monitoring, by the receiver, the reflection coefficient determined at various instant of time;

training, by the receiver, a ML engine to learn the reflection coefficient determined at various instant of time; and

predicting, by the receiver, the reflection coefficient for each reflector of the IRS based on the learning using the ML engine.

15. A method for enhancing power of a signal in a wireless communication system using an intelligent reflecting surface (IRS) comprising reflectors, the method comprising:

estimating, by a transmitter of the wireless communication system, a first channel gain by transmitting a pilot signal to a receiver through each antenna from a plurality of antennas of the transmitter and the IRS, wherein a reflection coefficient for each reflector of the IRS is set as zero;

estimating, by the transmitter, a second channel gain by transmitting the pilot signal to the receiver through each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one;

determining, by the transmitter, a difference between the second channel gain and the first channel gain for each antenna;

sorting, by the transmitter, each antenna in decreasing order of the difference between the second channel gain and the first channel gain for each antenna;

selecting, by the transmitter, top n number of antenna from the sorted antennas as a set of antennas;

transmitting, by the transmitter, the pilot signal through the selected set of antennas;

determining, by the transmitter, a reflection coefficient for each reflector of the IRS based on the set of antennas;

configuring, by the transmitter, the reflectors of the IRS with the reflection coefficient;

determining, by the transmitter, an optimal beamforming required for transmitting the signal from the set of antennas based on the reflection coefficient and the set of antennas; and

transmitting, by the transmitter, the signal to the receiver through the configured reflectors and the set of antennas based on the optimal beamforming.

16. A method for enhancing power of a signal in a wireless communication system using an intelligent reflecting surface (IRS) comprising reflectors, the method comprising:

estimating, by a receiver, a first channel gain by receiving a pilot signal from each antenna of a plurality of antennas of a transmitter and the IRS of the wireless communication system, wherein a reflection coefficient for each reflector of the IRS is set as zero;

estimating, by the receiver, a second channel gain by receiving the pilot signal from each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one;

determining, by the receiver, a difference between the second channel gain and the first channel gain for each antenna;

sorting, by the receiver, each antenna in decreasing order of the difference between the second channel gain and the first channel gain for each antenna;

selecting, by the receiver, top n number of antenna from the sorted antennas as a set of antennas;

determining, by the receiver, a reflection coefficient for each reflector of the IRS based on the set of antennas and the pilot signal transmitted by the transmitter; and

reporting, by the receiver, the selected top n number of antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

17. A transmitter for enhancing power of a signal in a wireless communication system using an intelligent reflecting surface (IRS) comprising reflectors, the transmitter comprising:

a memory;

a communicator being equipped with a plurality of antennas and a plurality of radio frequency (RF) chains; and

a processing circuitry, coupled with the memory and the communicator, configured to:

estimate a channel gain by transmitting a pilot signal to a receiver through at least one antenna from the plurality of antennas of the transmitter and the IRS,

determine an antenna selection metric based on the channel gain in transmitting the pilot signal to the receiver through the at least one antenna from the plurality of antennas of the transmitter and the IRS,

identify the at least one antenna from the plurality of antennas that causes to provide the largest antenna selection metric,

determine a reflection coefficient for each reflector of the IRS based on the identified antenna,

configure the reflectors of the IRS with the reflection coefficient, and

transmit the signal to the receiver through the at least one identified antenna and the configured reflectors.

18. A receiver for enhancing power of a signal in a wireless communication system using an intelligent reflecting surface (IRS) comprising reflectors, the receiver comprising:

a memory;

a communicator being equipped with at least one receive antennas and at least one receive radio frequency (RF) chain; and

a processing circuitry, coupled with the memory and the communicator, configured to:

estimate a channel gain by receiving a pilot signal from at least one antenna of a plurality of antennas of a transmitter and the IRS of the wireless communication system,

determine an antenna selection metric based on the channel gain in receiving the pilot signal from the at least one antenna of the plurality of antennas of the transmitter and the IRS,

identify the at least one antenna from the plurality of antennas that causes to provide the largest antenna selection metric,

determine a reflection coefficient for each reflector of the IRS based on the at least one identified antenna, and

report the at least one identified antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the at least one identified antenna.

19. A transmitter for enhancing power of a signal in a wireless communication system using an intelligent reflecting surface (IRS) comprising reflectors, the transmitter comprising:

a memory;

a communicator being equipped with a plurality of antennas and a plurality of radio frequency (RF) chains; and

a processing circuitry, coupled with the memory and the communicator, configured to:

estimate a first channel gain by transmitting a pilot signal to a receiver through each antenna from the plurality of antennas of the transmitter and the IRS, wherein a reflection coefficient for each reflector of the IRS is set as zero,

estimate a second channel gain by transmitting the pilot signal to the receiver through each antenna from the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one,

determine a difference between the second channel gain and the first channel gain for each antenna,

sort each antenna in decreasing order of the difference between the second channel gain and the first channel gain for each antenna,

select top n number of antenna from the sorted antennas as a set of antennas,

transmit the pilot signal through the selected set of antennas,

determine a reflection coefficient for each reflector of the IRS based on the set of antennas,

configure the reflectors of the IRS with the reflection coefficient,

determine an optimal beamforming required for transmitting the signal from the set of antennas based on the reflection coefficient and the set of antennas, and

transmit the signal to the receiver through the configured reflectors and the set of antennas based on the optimal beamforming.

20. A receiver for enhancing power of a signal in a wireless communication system using an intelligent reflecting surface (IRS) comprising reflectors, the receiver comprising:

a memory;

a communicator being equipped with at least one receive antennas and at least one receive radio frequency (RF) chain; and

a processing circuitry, coupled with the memory and the communicator, configured to:

estimate a first channel gain by receiving a pilot signal from each antenna of a plurality of antennas of a transmitter and the IRS, wherein a reflection coefficient for each reflector of the IRS is set as zero,

estimate a second channel gain by receiving the pilot signal from each antenna of the plurality of antennas and the IRS, wherein the reflection coefficient for each reflector of the IRS is set as one,

determine a difference between the second channel gain and the first channel gain for each antenna,

sort each antenna in decreasing order of the difference between the second channel gain and the first channel gain for each antenna,

select top n number of antenna from the sorted antennas as a set of antennas,

determine a reflection coefficient for each reflector of the IRS based on the set of antennas and the pilot signal transmitted by the transmitter, and

report the selected top n number of antenna and the reflection coefficient for each reflector to the transmitter for configuring the reflectors of the IRS with the reflection coefficient and enabling the transmitter to transmit the signal through the identified antenna.

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EP4173156A1

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2023-05-03

CN116420318B

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CN116420318A

( en )

2023-07-11

WO2022080896A1

( en )

2022-04-21

US20220123803A1

( en )

2022-04-21

Method and device for enhancing power of signal in wireless communication … — Samsung Electronics Co., Ltd. (US11626909B2)

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