Inter-RIS Beam Focusing Codebook Design in Cooperative Distributed RIS Systems

TL;DR

This paper proposes a novel cooperative distributed RIS system with an inter-RIS beam focusing codebook, enhancing connectivity and spatial multiplexing by strategically deploying multiple RISs and optimizing phase shifts for precise signal control.

Contribution

It introduces a new inter-RIS beam focusing codebook design that accounts for incidence and reflection angles, enabling flexible and precise signal direction control in distributed RIS systems.

Findings

Enhanced signal power through optimized phase shift design

Improved connectivity and spatial multiplexing in distributed RIS networks

Flexible RIS deployment supporting diverse user scenarios

Abstract

This paper explores distributed Reconfigurable Intelligent Surfaces (RISs) by introducing a cooperative dimension that enhances adaptability and performance. It focuses on strategically deploying multiple RISs to improve connectivity with the Base Station (BS) and among RISs, thereby aiding users in areas with weak BS coverage and enhancing spatial multiplexing gains. Each RIS can function as a primary surface to directly support users or as an intermediary surface to reflect signals to another primary surface. This dual functionality enables flexible responses to changing conditions. We implement an inter-RIS signal focusing design for phase shifts, creating a tailored codebook for precise control over signal direction. This design considers the interplay of incidence and reflection angles to maximize reflected signal power, based on the RIS response function and the physical properties of the RIS elements.