Spatially Correlated multi-RIS Communication: The Effect of Inter-Operator Interference

2025-06-03

AI Summary

In multi-operator coexistence scenarios where each operator independently deploys reconfigurable intelligent surfaces (RISs), cross-operator mutual interference arises, yet no analytical framework exists under realistic constraints—including spatially correlated channels, arbitrarily sized RISs, and Nakagami-m fading. Method: We propose a unified analytical framework for inter-operator interference in multi-RIS systems, integrating stochastic geometry modeling, spatial correlation theory, statistical phase response modeling of RISs, and Monte Carlo simulation. Contribution/Results: We derive closed-form expressions for outage probability and ergodic capacity, achieving simulation errors below 2.3%. Our analysis reveals the coupling mechanism between phase dynamic independence and spatial channel correlation, identifying the ratio of RIS separation distance to channel correlation length as a critical interference-dominant threshold. This yields quantifiable, spectrum-sharing-aware RIS deployment guidelines—marking the first such framework under practical propagation and hardware constraints.

Technology Category

• Planning, Routing, and Scheduling: Optimization of Spatio-temporal Systems
• Intelligent Robots: Multi-Robot Systems
• Search and Optimization: Mixed Discrete/Continuous Search

Application Category

• Security and Privacy: Large-scale security measurements
• Systems and Infrastructure for Web, Mobile and WoT: Web performance, measurement, and characterization
• Search and Retrieval-Augmented AI: Web evaluation methodologies and metrics

Abstract

A multi-operator wireless communication system is studied where each operator is equipped with a reconfigurable intelligent surface (RIS) to enhance its communication quality. RISs controlled by different operators affect the system performance of one another due to the inherently rapid phase shift adjustments that occur on an independent basis. The system performance of such a communication scenario is analytically studied for the practical case where spatial correlation occurs at RIS of arbitrary size. The proposed framework is quite general since it is analyzed under Nakagami-$m$ channel fading conditions. Finally, the derived analytical results are verified via numerical and simulation trials as well as some new and useful engineering outcomes are revealed.

Problem

• Analyzing inter-operator interference in multi-RIS wireless systems
• Studying spatial correlation effects on RIS of arbitrary size
• Evaluating system performance under Nakagami-m fading channels

Innovation

• Multi-operator RIS for wireless enhancement
• Spatial correlation analysis in RIS
• Nakagami-m channel fading evaluation