Adaptive Beamforming Design for mmWave RIS-Aided Joint Localization and Communication
Paper i proceeding, 2020

The concept of reconfigurable intelligent surface (RIS) has been proposed to change the propagation of electromagnetic waves, e.g., reflection, diffraction, and refraction. To accomplish this goal, the phase values of the discrete RIS units need to be optimized. In this paper, we consider RIS-aided millimeter-wave (mmWave) multiple-input multiple-output (MIMO) systems for both accurate positioning and high data-rate transmission. We propose an adaptive phase shifter design based on hierarchical codebooks and feedback from the mobile station (MS). The benefit of the scheme lies in that the RIS does not require deployment of any active sensors and baseband processing units. During the update process of phase shifters, the combining vector at the MS is sequentially refined. Simulation results show the performance improvement of the proposed algorithm over the random phase design scheme, in terms of both positioning accuracy and data rate. Moreover, the performance converges to that of the exhaustive search scheme even in the low signal-to-noise ratio regime.

mmWave MIMO

hierarchical codebook

reconfigurable intelligent surface

Analog beamforming



Jiguang He

Oulun Yliopisto

Henk Wymeersch

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Tachporn Sanguanpuak

Oulun Yliopisto

Olli Silven

Oulun Yliopisto

Markku Juntti

Chalmers, Elektroteknik

2020 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2020 - Proceedings


2020 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2020
Seoul, South Korea,

Multidimensionell signalbehandling med frekvenskammar

Vetenskapsrådet (VR) (2018-03701), 2018-12-01 -- 2021-12-31.




Annan elektroteknik och elektronik



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