Joint Optimization for RIS-Assisted Wireless Communications: From Physical and Electromagnetic Perspectives

Cheng, Xin; Lin, Yan; Shi, Weiping; Li, Jiayu; Pan, Cunhua; Shu, Feng; Wu, Yongpeng; Wang, Jiangzhou

doi:10.1109/tcomm.2021.3120721

Cited by 29 publications

(9 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fig. 10 depicts the optimal rotation angle at the RIS as concluded in (23) and (33). Based on the previous introduction, it is clear that a smaller r represents a smaller horizontal distance from the RIS to the Tx-Ant, i.e.…”

Section: A Impact Of the Rotation Angles On The Capacitymentioning

confidence: 87%

“…Note that, due to the symmetry of the CCG with respect to r = R/2, the location (R − r opt , h opt ) can be also adopted as the optimal location. Accordingly, the optimal rotation of the RIS can be calculated according to (33).…”

Section: ) Optimal Location Selectionmentioning

confidence: 99%

“…Please note that for the optimization of the RIS location and effective region, the capacity of each location is based on the optimal rotation as given in (33). Based on Algorithm 1, we obtain the best two locations, including P (0, 0, h min ) and P (0, R, h min ), for maximum capacity.…”

Section: B Impact Of the Ris Location On The Capacitymentioning

confidence: 99%

“…For instance, the study in [11] showed that the effective area of RIS has a significant impact on the SNR, where the effective area is sensitive to its orientation, but the optimal orientation was not revealed. The authors in [32] indicated that the RIS should be deployed vertically to the direction from the base station to RIS for coverage extension, while the authors in [33] suggested that the RIS ought to be optimally oriented to make it in specular reflection state to maximize the received power. However, these analyses are based on the assumption of LOS channel models, which is not universal and is not applicable in scenarios where non-LOS (NLOS) links exist.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

RIS-Aided Wireless Communications: Extra Degrees of Freedom via Rotation and Location Optimization

Cheng¹,

Wei²,

Huang³

et al. 2022

Preprint

View full text Add to dashboard Cite

We consider the extra degree of freedom offered by the rotation of the reconfigurable intelligent surface (RIS) plane and investigate its potential in improving the performance of RIS-assisted wireless communication systems. By considering radiation pattern modeling at all involved nodes, we first derive the composite channel gain and present a closed-form upper bound for the system ergodic capacity over cascade Rician fading channels. Then, we reconstruct the composite channel gain by taking the rotations at the RIS plane, transmit antenna, and receive antenna into account, and extract the optimal rotation angles after investigating their impacts on the capacity. Moreover, we present a location-dependent expression of the ergodic capacity and investigate the RIS deployment strategy, i.e. the joint rotation

show abstract

Section: A Impact Of the Rotation Angles On The Capacitymentioning

confidence: 87%

Section: ) Optimal Location Selectionmentioning

confidence: 99%

Section: B Impact Of the Ris Location On The Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

RIS-Aided Wireless Communications: Extra Degrees of Freedom via Rotation and Location Optimization

Cheng¹,

Wei²,

Huang³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…There have been many papers studying the RIS-aided localization problem in different scenarios. According to the scenarios, these papers can be divided into two categories, namely near-field [10]- [12] and far-field [13]- [15]. Depending on where the RIS is deployed, it can be further classified as being placed on the BS side [1], [16], on the UE side [17], or as a separate reflector [18], [19].…”

Section: Introductionmentioning

confidence: 99%

Joint Localization and Beamforming for Reconfigurable Intelligent Surface Aided 5G mmWave Communication Systems

Yunis¹,

Lyu²,

Yang³

et al. 2022

Preprint

View full text Add to dashboard Cite

Reconfigurable intelligent surface (RIS) is an attractive technology to improve the transmission rate of millimetre-wave (mmWave) communication systems. The previous research on RIS technology mainly focused on improving the transmission rate and security rate of the mmWave communication systems. Since the emergence of RIS technology creates the conditions for generating an intelligent radio environment, it also has potential advantages on improving the localization accuracy of the mmWave communication systems. Deployed on walls and objects, RISs are capable of significantly improving communications and positioning coverage by controlling the multi-path reflection. This paper considers the RIS-aided mmWave localization system and proposes a joint beamforming and localization problem. However, since the objective function depends on the unknown UE's position and instantaneous channel state information (CSI), this beamforming and localization technology based on RIS assistance is challenging. To solve this problem, we propose a new joint localization and beamforming optimization (JLBO) algorithm, and give the proof of its convergence. The simulation results show that the RIS can improve the user localization accuracy of the system and the proposed scheme has a significant performance improvement compared with the traditional schemes.

show abstract

Advancements in IoT system security: a reconfigurable intelligent surfaces and backscatter communication approach

Abideen,

Wahid,

Kamal

et al. 2025

J Supercomput

View full text Add to dashboard Cite

Joint Optimization for RIS-Assisted Wireless Communications: From Physical and Electromagnetic Perspectives

Cited by 29 publications

References 31 publications

RIS-Aided Wireless Communications: Extra Degrees of Freedom via Rotation and Location Optimization

RIS-Aided Wireless Communications: Extra Degrees of Freedom via Rotation and Location Optimization

Joint Localization and Beamforming for Reconfigurable Intelligent Surface Aided 5G mmWave Communication Systems

Advancements in IoT system security: a reconfigurable intelligent surfaces and backscatter communication approach

Contact Info

Product

Resources

About