Low-Complexity Near-Field Beam Training with DFT Codebook based on Beam Pattern Analysis

Fuente: arXiv
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Main Authors: Wang, Zijun, Kiran, Rama, Tsai, Shawn, Zhang, Rui
Format: Preprint
Published: 2025
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author Wang, Zijun
Kiran, Rama
Tsai, Shawn
Zhang, Rui
author_facet Wang, Zijun
Kiran, Rama
Tsai, Shawn
Zhang, Rui
contents Extremely large antenna arrays (ELAAs) operating in high-frequency bands have spurred the development of near-field communication, driving advancements in beam training design. This paper introduces an efficient near-field beam training method that utilizes the discrete Fourier transform (DFT) codebook traditionally employed for far-field users (FUs). We begin by analyzing the received beam pattern and deriving closed-form expressions for its width and central beam gain as a function of user location. Building on these derived expressions, we propose a beam training method that estimates user distance from the received signal powers using DFT beams, with a computational complexity of O(1). Simulation results confirm the efficacy of our approach, demonstrating its ability to perform low-complexity near-field beam training with high estimation accuracy. Notably, our proposed scheme achieves up to a 1.96 dB SNR gain over exhaustive search methods in multi-user beamforming scenarios.
format Preprint
id arxiv_https___arxiv_org_abs_2503_21954
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Low-Complexity Near-Field Beam Training with DFT Codebook based on Beam Pattern Analysis
Wang, Zijun
Kiran, Rama
Tsai, Shawn
Zhang, Rui
Signal Processing
Extremely large antenna arrays (ELAAs) operating in high-frequency bands have spurred the development of near-field communication, driving advancements in beam training design. This paper introduces an efficient near-field beam training method that utilizes the discrete Fourier transform (DFT) codebook traditionally employed for far-field users (FUs). We begin by analyzing the received beam pattern and deriving closed-form expressions for its width and central beam gain as a function of user location. Building on these derived expressions, we propose a beam training method that estimates user distance from the received signal powers using DFT beams, with a computational complexity of O(1). Simulation results confirm the efficacy of our approach, demonstrating its ability to perform low-complexity near-field beam training with high estimation accuracy. Notably, our proposed scheme achieves up to a 1.96 dB SNR gain over exhaustive search methods in multi-user beamforming scenarios.
title Low-Complexity Near-Field Beam Training with DFT Codebook based on Beam Pattern Analysis
topic Signal Processing
url https://arxiv.org/abs/2503.21954