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Hybrid near-field and far-field three-stage beam training with beamsplit for RIS-assistedOFDMcommunications
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Zhichao CHENG, Shupei ZHANG, Shu FU, Boya DI. Hybrid near-field and far-field three-stage beam training with beamsplit for RIS-assistedOFDMcommunications[J]. Frontiers of Information Technology & Electronic Engineering, 1998, -1(-1): .
@article{title="Hybrid near-field and far-field three-stage beam training with beamsplit for RIS-assistedOFDMcommunications",
author="Zhichao CHENG, Shupei ZHANG, Shu FU, Boya DI",
journal="Frontiers of Information Technology & Electronic Engineering",
volume="-1",
number="-1",
pages="",
year="1998",
publisher="Zhejiang University Press & Springer",
doi="10.1631/FITEE.2400372"
}
%0 Journal Article
%T Hybrid near-field and far-field three-stage beam training with beamsplit for RIS-assistedOFDMcommunications
%A Zhichao CHENG
%A Shupei ZHANG
%A Shu FU
%A Boya DI
%J Journal of Zhejiang University SCIENCE C
%V -1
%N -1
%P
%@ 2095-9184
%D 1998
%I Zhejiang University Press & Springer
%DOI 10.1631/FITEE.2400372
TY - JOUR
T1 - Hybrid near-field and far-field three-stage beam training with beamsplit for RIS-assistedOFDMcommunications
A1 - Zhichao CHENG
A1 - Shupei ZHANG
A1 - Shu FU
A1 - Boya DI
J0 - Journal of Zhejiang University Science C
VL - -1
IS - -1
SP -
EP -
%@ 2095-9184
Y1 - 1998
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/FITEE.2400372
Abstract: With the development of millimeter-wave (mmWave) communication systems, large-scale reconfigurable intelligent surfaces (RISs) have gained considerable attention as a promising technology for signal strength enhancement and coverage extension. However, as the antenna scale and bandwidth increase, RIS-assisted wideband orthogonal frequency division multiplexing (OFDM) communication systems face challenges due to the near-field range expansion and the beam split effect over the high-frequency band, complicating the acquisition of channel state information (CSI). To tackle these challenges, in this paper, we present a codebook-based three-stage beam training scheme by utilizing the beam split effect to bypass CSI estimation. Specifically, by analyzing the beam split effect in RIS-assisted OFDM communication systems, we propose a beam-split-aware codebook capable of covering both the near and far fields with fewer codewords compared to conventional narrow-band codebooks. Using such a codebook, a three-stage beam training mechanism is performed to obtain the optimal codeword with low time overhead, thereby facilitating subsequent beamforming. Simulation results demonstrate that the proposed scheme outperforms existing near- and far-field codebook-based schemes in terms of the beam training resolution and sum rate in the hybrid near-far field.
Open peer comments: Debate/Discuss/Question/Opinion
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