Full Text:   <84>

Summary:  <19>

CLC number: TN92

On-line Access: 2025-01-24

Received: 2024-05-09

Revision Accepted: 2025-01-24

Crosschecked: 2024-10-21

Cited: 0

Clicked: 206

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Zhichao CHENG

https://orcid.org/0009-0000-9415-004X

Boya DI

https://orcid.org/0000-0003-3484-1361

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Frontiers of Information Technology & Electronic Engineering  2024 Vol.25 No.12 P.1664-1678

http://doi.org/10.1631/FITEE.2400372


Hybrid near- and far-field three-stage beam training with beam split for RIS-assisted OFDM communications


Author(s):  Zhichao CHENG, Shupei ZHANG, Shu FU, Boya DI

Affiliation(s):  School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China; more

Corresponding email(s):   chengzhichao@stu.pku.edu.cn, zhangshupei@pku.edu.cn, shufu@cqu.edu.cn, diboya@pku.edu.cn

Key Words:  Near-far field, Beam split, Codebook design, Beam training, Reconfigurable intelligent surfaces


Zhichao CHENG, Shupei ZHANG, Shu FU, Boya DI. Hybrid near- and far-field three-stage beam training with beam split for RIS-assisted OFDM communications[J]. Frontiers of Information Technology & Electronic Engineering, 2024, 25(12): 1664-1678.

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author="Zhichao CHENG, Shupei ZHANG, Shu FU, Boya DI",
journal="Frontiers of Information Technology & Electronic Engineering",
volume="25",
number="12",
pages="1664-1678",
year="2024",
publisher="Zhejiang University Press & Springer",
doi="10.1631/FITEE.2400372"
}

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%T Hybrid near- and far-field three-stage beam training with beam split for RIS-assisted OFDM communications
%A Zhichao CHENG
%A Shupei ZHANG
%A Shu FU
%A Boya DI
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T1 - Hybrid near- and far-field three-stage beam training with beam split for RIS-assisted OFDM communications
A1 - Zhichao CHENG
A1 - Shupei ZHANG
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A1 - Boya DI
J0 - Frontiers of Information Technology & Electronic Engineering
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PB - Zhejiang University Press & Springer
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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, we present a codebook-based three-stage beam training scheme by using 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 adopted 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.

RIS辅助OFDM通信的混合近-远场波束分裂三阶段波束训练

程志超1,张殊培2,付澍3,邸博雅2
1北京大学信息科学技术学院,中国北京市,100871
2北京大学电子学院区域光纤通信网与新型光通信系统国家重点实验室,中国北京市,100871
3重庆大学微电子与通信工程学院,中国重庆市,400044
摘要:随着毫米波通信系统的发展,大规模可重构智能超表面(RIS)作为一种增强信号强度和扩展覆盖范围的潜力技术,受到广泛关注。然而,随着天线规模和带宽的增加,RIS辅助的宽带正交频分复用(OFDM)通信系统在高频段面临着近场范围扩展和波束分裂效应带来的挑战,导致信道状态信息(CSI)的获取更加困难。为应对这些挑战,本文利用波束分裂效应提出一种基于码本的三阶段波束训练方案,从而避免了CSI估计。具体而言,分析了RIS辅助OFDM通信系统中的波束分裂效应,设计了一种波束分裂感知码本。与传统窄带码本相比,该码本使用更少的码字即可覆盖近场和远场。基于此码本,三阶段波束训练机制得以实施,该机制以低时间开销获得最优码字,从而便于后续波束成形。仿真结果表明,在混合近-远场条件下,所提方案在波束训练准确率和数据传输速率方面优于现有基于近场或远场窄带码本的方案。

关键词:近-远场;波束分裂;码本设计;波束训练;可重构智能超表面

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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