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

Autor:	Nguyen, Nhan Thanh, Nguyen, Van-Dinh, Wu, Qingqing, Tolli, Antti, Chatzinotas, Symeon, Juntti, Markku
Rok vydání:	2022
Předmět:	Computer Science - Information Theory Electrical Engineering and Systems Science - Signal Processing
Druh dokumentu:	Working Paper
Popis:	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-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%. Comment: This paper has been submitted to IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) 2022
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2203.07042 Zobrazit plný text záznamu View this record from Arxiv