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Two-Timescale Transmission Design and RIS Optimization for Integrated Localization and Communications | IEEE Journals & Magazine | IEEE Xplore

Two-Timescale Transmission Design and RIS Optimization for Integrated Localization and Communications


Abstract:

Reconfigurable intelligent surfaces (RISs) have tremendous potential to boost communication performance, especially when the line-of-sight (LOS) path between the user equ...Show More

Abstract:

Reconfigurable intelligent surfaces (RISs) have tremendous potential to boost communication performance, especially when the line-of-sight (LOS) path between the user equipment (UE) and base station (BS) is blocked. To control the RIS, channel state information (CSI) is needed, which entails significant pilot overhead. To reduce this overhead and the need for frequent RIS reconfiguration, we propose a novel framework for integrated localization and communications, where RIS configurations are fixed during location coherence intervals, while BS precoders are optimized every channel coherence interval. This framework leverages accurate location information obtained with the aid of several RISs as well as novel RIS optimization and channel estimation methods. Performance in terms of localization accuracy, channel estimation error, and achievable rate demonstrates the effectiveness of the proposed approach.
Published in: IEEE Transactions on Wireless Communications ( Volume: 22, Issue: 12, December 2023)
Page(s): 8587 - 8602
Date of Publication: 11 April 2023

ISSN Information:

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I. Introduction

As the fifth-generation (5G) cellular network is being deployed worldwide, the research community is investigating key technologies towards the sixth-generation (6G), which is expected to be standardized in the late 2020s [1], [2], [3]. Among the key enablers, we count the introduction of reconfigurable intelligent surfaces (RISs), which are large planar arrays of configurable small meta-atoms [4], [5], [6]. Such RISs can be placed on regular surfaces and through their configuration enable the modification of the radio propagation channel far beyond what was previously possible. An important canonical use case is to overcome the line-of-sight (LOS) blockage between a base station (BS) and a user equipment (UE), which is especially relevant in millimeter wave (mmWave) and sub-terahertz (THz) frequency bands (30 GHz - 300 GHz) [6], [7], [8].

References

References is not available for this document.