Randomized Control of Wireless Temporal Coherence via Reconfigurable Intelligent Surface

Autor:	de Souza, João Henrique Inacio, Croisfelt, Victor, Saggese, Fabio, Abrão, Taufik, Popovski, Petar
Rok vydání:	2023
Předmět:	Computer Science - Information Theory Electrical Engineering and Systems Science - Signal Processing
Druh dokumentu:	Working Paper
Popis:	A reconfigurable intelligent surface (RIS) can shape the wireless propagation channel by inducing controlled phase shift variations to the impinging signals. Multiple works have considered the use of RIS by time-varying configurations of reflection coefficients. In this work we use the RIS to control the channel coherence time and introduce a generalized discrete-time-varying channel model for RIS-aided systems. We characterize the temporal variation of channel correlation by assuming that a configuration of RIS' elements changes at every time step. The analysis converges to a randomized framework to control the channel coherence time by setting the number of RIS' elements and their phase shifts. The main result is a framework for a flexible block-fading model, where the number of samples within a coherence block can be dynamically adapted. Comment: 6 pages, 4 figures, conference paper
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2302.00074 Zobrazit plný text záznamu View this record from Arxiv