Hybrid Active-Passive Reconfigurable Intelligent Surface-Assisted Multi-User MISO Systems

被引：29

作者：

Nguyen, Nhan T. ^{[1
]}

V-Dinh Nguyen ^{[2
]}

Wu, Qingqing ^{[3
]}

Tolli, Antti ^{[1
]}

Chatzinotas, Symeon ^{[2
]}

Juntti, Markku ^{[1
]}

机构：

[1] Univ Oulu, Ctr Wireless Commun, POB 4500, FI-90014 Oulu, Finland

[2] Univ Luxembourg, Interdisciplinary Ctr Secur Reliabil & Trust SnT, L-1855 Luxembourg, Luxembourg

[3] Univ Macau, State Key Lab Internet Things Smart City, Macau 999078, Peoples R China

来源：

2022 IEEE 23RD INTERNATIONAL WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATION (SPAWC) | 2022年

基金：

芬兰科学院;

关键词：

Hybrid active-passive RIS; multi-user MISO; RIS semi-passive beamforming; successive convex approximation; RIS;

D O I：

10.1109/SPAWC51304.2022.9833956

中图分类号：

TP301 [理论、方法];

学科分类号：

081202 ;

摘要：

We consider a multi-user multiple-input singleoutput (MISO) communications system which is assisted by a hybrid active-passive reconfigurable intelligent surface (RIS). Unlike conventional passive RISs, hybrid RIS is equipped with a few active elements with the ability to reflect and amplify incident signals to significantly improve the system performance. Towards a fairness-oriented design, we maximize the minimum rate among all users through jointly optimizing the transmit beamforming vectors and RIS reflecting/amplifying coefficients. Combining tools from block coordinate ascent and successive convex approximation, the challenging nonconvex problem is efficiently solved by a low-complexity iterative algorithm. The numerical results show that a hybrid RIS with 4 active elements out of a total of 50 elements with a power budget of -1 dBm offers an improvement of up to 80% to the considered system, while that achieved by a fully passive RIS is only 27%.

引用

页数：5

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