integrated sensing and communications (ISAC); Stacked intelligent metasurfaces (SIM); wave-based beamforming; Array signal processing; Downlink; Hardware; Integrated sensing; Integrated sensing and communication; Metasurface; Radars antennas; Radiofrequencies; Stacked intelligent metasurface; Wave-based beamforming; Control and Systems Engineering; Electrical and Electronic Engineering; Metasurfaces; Radio frequency; Radar antennas
Abstract :
[en] Stacked intelligent metasurfaces (SIM) have recently emerged as a promising technology, which can realize transmit precoding in the wave domain. In this letter, we investigate a SIM-aided integrated sensing and communications system, in which SIM is capable of generating a desired beam pattern for simultaneously communicating with multiple downlink users and detecting a radar target. Specifically, we formulate an optimization problem of maximizing the spectrum efficiency, while satisfying the power constraint of the desired direction. This requires jointly designing the phase shifts of the SIM and the power allocation at the base station. By incorporating the sensing power constraint into the objective functions as a penalty term, we further simplify the optimization problem and solve it by customizing an efficient gradient ascent algorithm. Finally, extensive numerical results demonstrate the effectiveness of the proposed wave-domain precoder for automatically mitigating the inter-user interference and generating a desired beampattern for the sensing task, as multiple separate data streams transmit through the SIM.
Disciplines :
Computer science
Author, co-author :
Niu, Haoxian ; University of Electronic Science and Technology of China, National Key Laboratory on Blind Signal Processing, School of Information and Communication Engineering, Chengdu, China
An, Jiancheng ; Nanyang Technological University, School of Electrical and Electronics Engineering, Tampines, Singapore
Papazafeiropoulos, Anastasios ; University of Hertfordshire, Communications and Intelligent Systems Research Group, Hatfield, United Kingdom ; University of Luxembourg, SnT, Esch-sur-Alzette, Luxembourg
Gan, Lu ; University of Electronic Science and Technology of China, National Key Laboratory on Blind Signal Processing, School of Information and Communication Engineering, Chengdu, China ; Yibin Institute, University of Electronic Science and Technology of China, Yibin, China
CHATZINOTAS, Symeon ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Debbah, Merouane ; Khalifa University of Science and Technology, KU 6G Research Center, Abu Dhabi, United Arab Emirates
External co-authors :
yes
Language :
English
Title :
Stacked Intelligent Metasurfaces for Integrated Sensing and Communications
Publication date :
22 August 2024
Journal title :
IEEE Wireless Communications Letters
ISSN :
2162-2337
eISSN :
2162-2345
Publisher :
Institute of Electrical and Electronics Engineers Inc.
This work was partially supported by Sichuan Science and Technology Program under Grant 2023YFSY0008 and 2023YFG0291. H. Niu and L. Gan are with the national key laboratory on blind signal processing, School of Information and Communication Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, Sichuan, 611731, China. L. Gan is also with the Yibin Institute of UESTC, Yibin 644000, China (e-mail: haoxian niu@163.com; ganlu@uestc.edu.cn). J. An is with the School of Electrical and Electronics Engineering, Nanyang Technological University, Singapore 639798 (e-mail: jiancheng an@163.com). A. Papazafeiropoulos is with the Communications and Intelligent Systems Research Group, University of Hertfordshire, Hatfield AL10 9AB, U. K., and with SnT at the University of Luxembourg, Luxembourg (e-mail: tapapazaf@gmail.com). S. Chatzinotas is with the SnT at the University of Luxembourg, Luxembourg (e-mail: symeon.chatzinotas@uni.lu). M. Debbah is with KU 6G Research Center, Khalifa University of Science and Technology, Abu Dhabi 127788, UAE (e-mail: merouane.debbah@ku.ac.ae).
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