[en] We consider a multi-user multiple-input single-
output (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 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 ascend 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%
Disciplines :
Computer science
Author, co-author :
Nguyen, Nhan T.
Nguyen, V.-Dinh
Wu, Qingqing
Tölli, Antti
Chatzinotas, Symeon ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Juntti, Markku
External co-authors :
yes
Language :
English
Title :
Hybrid Active-Passive Reconfigurable Intelligent Surface-Assisted Multi-User MISO Systems
Publication date :
04 July 2022
Event name :
2022 IEEE 23rd International Workshop on Signal Processing Advances in Wireless Communication (SPAWC)
