RIS-Assisted ISAC: Precoding and Phase-Shift Optimization for Mono-Static Target Detection

Autor:	Demir, Özlem Tuğfe, Björnson, Emil
Rok vydání:	2024
Předmět:	Electrical Engineering and Systems Science - Signal Processing Computer Science - Emerging Technologies
Druh dokumentu:	Working Paper
Popis:	The reconfigurable intelligent surface (RIS) technology emerges as a highly useful component of the rapidly evolving integrated sensing and communications paradigm, primarily owing to its remarkable signal-to-noise ratio enhancement capabilities. In this paper, our focus is on mono-static target detection while considering the communication requirement of a user equipment. Both sensing and communication benefit from the presence of an RIS, which makes the channels richer and stronger. Diverging from prior research, we comprehensively examine three target echo paths: the direct (static) channel path, the path via the RIS, and a combination of these, each characterized by distinct radar cross sections (RCSs). We take both the line-of-sight (LOS) and the non-line-of-sight (NLOS) paths into account under a clutter for which the distribution is not known, but the low-rank subspace it resides. We derive the generalized likelihood ratio test (GLRT) detector and introduce a novel approach for jointly optimizing the configuration of RIS phase-shifts and precoding. Our simulation results underscore the paramount importance of this combined design in terms of enhancing detection probability. Moreover, it becomes evident that the derived clutter-aware target detection significantly enhances detection performance, especially when the clutter is strong. Comment: 6 pages, 3 figures, accepted to be presented at IEEE GLOBECOM 2024
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2410.06855 Zobrazit plný text záznamu View this record from Arxiv