Reference : Hybrid Active-Passive Reconfigurable Intelligent Surface-Assisted Multi-User MISO Systems
Scientific congresses, symposiums and conference proceedings : Poster
Engineering, computing & technology : Computer science
Computational Sciences
Hybrid Active-Passive Reconfigurable Intelligent Surface-Assisted Multi-User MISO Systems
Nguyen, Nhan T. []
Nguyen, V.-Dinh []
Wu, Qingqing []
Tölli, Antti []
Chatzinotas, Symeon mailto [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom >]
Juntti, Markku []
2022 IEEE 23rd International Workshop on Signal Processing Advances in Wireless Communication (SPAWC)
04-06 July 2022
[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%
10.13039/501100002341-Academy of Finland

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