3-D Hybrid Beamforming for Terahertz Broadband Communication System With Beam Squint

Wu, Yezeng; Song, Guochao; Liu, Hui; Xiao, Lixia; Jiang, Tao

doi:10.1109/tbc.2022.3205214

Cited by 18 publications

(14 citation statements)

References 43 publications

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“…In this section, we introduce the proposed two 3D hybrid beamforming architectures for the ultra massive MIMO THz system based on UPA in Ref. [36], two‐tier TTD is used to eliminate the beam squint. Besides, We also give several potential research directions and future research plans.…”

Section: D Hybrid Beamforming For Thz Communication With Beam Squintmentioning

confidence: 99%

“…Therefore, although the hybrid beamforming methods based on TTD can perfectly solve the beam squint effect and obtain the performance approaching the optimal full digital precoding without restriction, there are also many inherent defects and problems of TTD in practical applications, such as its high insertion loss, which reaches −20 dB at the 30 GHz frequency band [34,35] . In addition, the hardware cost and delay limitation of TTD still need to be considered.…”

Section: Ttd Based Architecturementioning

confidence: 99%

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Hybrid Beamforming for Terahertz Wireless Communications with Beam Squint: A Survey

Xiao

LIU

et al. 2022

Chinese J of Electronics

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Benefiting from the ultra‐wide bandwidth, terahertz (THz) communication is considered one of the core technologies of the 6G mobile communication. However, high path loss is a severe issue for THz band, which needs to be solved by the ultra‐massive multiple‐input multiple‐output (MIMO) technology. For the sake of reducing the hardware cost and power comsumption, the hybrid beamforming technology is required, which has been adopted in the 5G communication. In the hybrid beamforming for the THz wideband system, the enormous antenna and ultra‐wide bandwidth cause the spatial‐ and frequency‐wideband effect, resulting in acute beam squint. Eliminating beam squint is the key to the engineering realization of ultra massive MIMO for the THz band. To circumvent this issue, this paper presents a comprehensive overview of the hybrid beamforming technology including the channel model, the traditional phase shifter based and the true time delay based architectures, the 3D hybrid beamforming for the uniform planar array. Finally, multiple significant open issues and potential challenges are pointed out and elaborated.

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Section: D Hybrid Beamforming For Thz Communication With Beam Squintmentioning

confidence: 99%

Section: Ttd Based Architecturementioning

confidence: 99%

Hybrid Beamforming for Terahertz Wireless Communications with Beam Squint: A Survey

Xiao

LIU

et al. 2022

Chinese J of Electronics

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“…Specifically, an optimization theory for the phases of RIS based on mean channel covariance matrix (MCCM) was advocated [8], but it is inefficient for THz transmissions. [9] alleviated the beam squint by grouping RIS elements and equipping subsurfaces with true time delay (TTD) units, which is designed for active RIS and will incur additional insertion loss, hardware cost and power consumption [10]. In this letter, we concentrate on the phase shifter-based passive RIS and precoder.…”

Section: Introductionmentioning

confidence: 99%

Deep Learning-Based Hybrid Precoding for RIS-Aided Broadband Terahertz Communication Systems in the Face of Beam Squint

Yuan,

Xiao,

et al. 2024

IEEE Wireless Commun. Lett.

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In this letter, we design a wideband hybrid reconfigurable intelligent surface network (WHRIS-Net) based on deep learning for reconfigurable intelligent surface (RIS)-assisted terahertz massive multiple-input multiple-output systems with beam squint. Firstly, the mean channel covariance matrices (MCCMs) from the base station to the RIS and from the RIS to the user are used as the inputs of WHRIS-Net. Then, a Phase-Net is applied to calculate the frequency-independent analog precoder and the phases of RIS elements. Finally, a Digital-Net designs the frequency-dependent digital precoder utilizing the MCCMs and the outputs of Phase-Net. Numerical simulations validate the effectiveness of the WHRIS-Net in terms of the sum rate and demonstrate its promising performance gain despite reduced average running time and feedback overhead.

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“…However, directly applying beamforming for sensing requires a lot of beam sweeping time as did in existing ISAC or the conventional Radar systems [31], [32]. Meanwhile, it has been shown in [22] and [33] that for a Terahertz communications system, the phenomenon of beam squint would appear, in which the beamforming from different subcarriers would point to different directions, making the energy of part subcarriers deviate from the desired target direction.…”

Section: Sensing Oriented Beamforming With Controllable Beam Squintmentioning

confidence: 99%

“…To deal with this harmful beam divergence problem, the traditional solutions adopt the true time delay lines (TTDs) to re-concentrate all subcarriers into one direction [33]. Nevertheless, one can actually take advantage of the beam squint effect to cover a wide area within one single OFDM symbol.…”

Section: B Utilizing the Beam Squint For Sensingmentioning

confidence: 99%

Engineering Mathematics Course in Department of Electrical Engineering at Southern University

Luo¹,

Bhattacharya²

2008 GSW Proceedings

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Engineering Mathematics Course at Electrical Engineering Department of Southern University is a fundamental core engineering course. This core course is taught in a way that shows how the engineering problems in the real world are related to the mathematic problems and how to solve these related engineering problems by adopting different mathematical tools, which is one of the greatest strengths of SU's EE curriculum-and having emphasis on fundamentals about how they apply to real-world problems. There always are very many types of mathematical topics to be covered in this course, and some of them overlap with other classes, such as Laplace Transform, Fourier series and transforms, etc. The main concern in this paper is how to set the materials for whole EE curriculum in engineering mathematics area, which covers most of useful engineering mathematics tools, and at the same time, reduces the overlaps with other EE classes. In other words, in our proposed Engineering Mathematics Course (ENGR 340), we will emphasize some mathematical methods only offered in the E-math course, and cut or reduce the materials which will be taught at other courses to increase students learning efficiency. In this paper, proposed E-math course teaching materials will be given, and some discussion will be provided.

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3-D Hybrid Beamforming for Terahertz Broadband Communication System With Beam Squint

Cited by 18 publications

References 43 publications

Hybrid Beamforming for Terahertz Wireless Communications with Beam Squint: A Survey

Hybrid Beamforming for Terahertz Wireless Communications with Beam Squint: A Survey

Deep Learning-Based Hybrid Precoding for RIS-Aided Broadband Terahertz Communication Systems in the Face of Beam Squint

Engineering Mathematics Course in Department of Electrical Engineering at Southern University

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