RXs Directions based Codebook Solution for Passive RIS Beamforming
Ahmed M. Nor, S. S. Sefati, Octavian Fratu, Simona Halunga

TL;DR
This paper introduces a direction-based codebook scheme for passive RIS beamforming that significantly reduces overhead, power, and time by mapping receiver directions to reflection patterns, with a database updating process for efficient future selections.
Contribution
The proposed D-PBF scheme maps receiver directions to codebook patterns and uses a database to minimize search overhead, offering a novel low-overhead alternative to channel estimation-based methods.
Findings
Achieves comparable effective rate with reduced overhead and power consumption.
Converges over time to eliminate the need for searching.
Requires significantly less time and power than traditional codebook and channel estimation methods.
Abstract
Recently, reconfigurable intelligent surface (RIS) has immensely been deployed to overcome blockage issue and widen coverage for enabling superior performance 6G networks. Mainly, systems use RIS as an assistant to redirect the transmitter (TX) incident signal towards the receiver (RX) by configuring RIS elements amplitudes and phase shifts in a passive beamforming (PBF) process. Channel estimation (CE) based PBF schemes achieve optimal performance, but they need high overhead and time consumption, especially with high number of RIS elements. Codebook (CB) based PBF solutions can be alternatives to overcome these issues by only searching through a limited reflection patterns (RPs) and determining the optimal one based on a predefined metric. However, they consume high power and time relevant to the used CB size. In this work, we propose a direction based PBF (D-PBF) scheme, where we aim…
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Taxonomy
TopicsAdvanced Wireless Communication Technologies · Antenna Design and Analysis · Indoor and Outdoor Localization Technologies
