Small-Scale Spatial-Temporal Correlation Modeling for Reconfigurable Intelligent Surfaces

The reconfigurable intelligent surface (RIS) is an emerging promising candidate technology for the sixth-generation wireless networks, where the element spacing is usually of sub-wavelength. Only limited knowledge, however, has been gained about the spatial-temporal correlation behavior among the el...

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Bibliographic Details
Published in:arXiv.org 2021-04
Main Authors: Sun, Shu, Hangsong Yan
Format: Article
Language:English
Subjects:
Angular distribution
Millimeter waves
Reconfigurable intelligent surfaces
Scattering
Wireless communication systems
Wireless networks
Online Access:Get full text
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Summary:The reconfigurable intelligent surface (RIS) is an emerging promising candidate technology for the sixth-generation wireless networks, where the element spacing is usually of sub-wavelength. Only limited knowledge, however, has been gained about the spatial-temporal correlation behavior among the elements in an RIS. In this paper, we investigate the joint spatial-temporal correlation models for an RIS in a wireless communication system. Joint small-scale spatial-temporal correlation functions are provided and analyzed for both ideal isotropic scattering and more practical non-isotropic scattering environments, where the latter is studied by employing an angular distribution derived from real-world millimeter-wave measurements. Analytical and simulation results demonstrate that the joint spatial-temporal correlation can be represented by a four-dimensional sinc function under isotropic scattering, while the correlation is generally stronger with more fluctuation for non-isotropic scattering with various motion directions.
ISSN:2331-8422