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arXiv

Cascaded channel modeling and experimental validation for RIS assisted communication system

作     者:Zhang, Jiwei Zhang, Yuxiang Jiang, Tao Gong, Huiwen Xing, Hongbo Tian, Lei 

作者机构:State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China China Mobile Research Institution Beijing China 

出 版 物:《arXiv》 (arXiv)

年 卷 期:2024年

核心收录:

主  题:Multipath propagation 

摘      要:Reconfigurable Intelligent Surface (RIS) is considered as a promising technology for 6G due to its ability to actively modify the electromagnetic propagation environment. Accurate channel modeling is essential for the design and evaluation of RIS assisted communication systems. Most current research models the RIS channel as a cascade of Tx-RIS and RIS-Rx sub-channels. However, most validation efforts regarding this assumption focus on large-scale path loss. To further explore this, in this paper, we derive and extend a convolution expression of RIS cascaded channel model based on the previously proposed Geometry-based Stochastic Model (GBSM)-based RIS cascaded channels. This model follows the 3GPP standard framework and leverages parameters such as angles, delays, and path powers defined in the GBSM model to more accurately reflect the small-scale characteristics of RIS multipath cascades. To verify the accuracy of this model, we conduct measurements of the Tx-RIS-Rx channel, Tx-RIS, and RIS-Rx sub-channels in a factory environment at 6.9 GHz, using the measured data to demonstrate the model’s validity and applicability in real-world scenarios. Validation with measured data shows that the proposed model accurately describes the characteristics of the RIS cascaded channel in terms of delay, angle, and power in complex multipath environments, providing important references for the design and deployment of RIS systems. Copyright © 2024, The Authors. All rights reserved.

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