Cluster-Based Multi-Carrier Hybrid Beamforming for Massive Device Terahertz Communications

Yuan, Hang; Yang, Nan; Ding, Xuhui; Han, Chong; Yang, Kai; An, Jianping

doi:10.1109/tcomm.2022.3155777

Cited by 19 publications

(6 citation statements)

References 47 publications

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“…It is noted that supporting simultaneous transmission towards multiple users using an LoS channel at very high frequencies is possible, if antenna spacing is much larger than the wavelength of signals. Trigger by this, the spatial degree of freedom (DoF) of THzCom systems needs to be derived as a function of dominant factors, including the number of radio frequency (RF) chains at the AP and the number of THz propagation paths in the environment [5]. Then, this function can be extended to incorporate other performance limiting factors, e.g., the angular spreads of channels, number and resolution of phase shifters, space between adjacent antennas, number and layout of APs, and number and properties of blockages.…”

Section: Wireless Data Center Military Networkmentioning

confidence: 99%

“…These subbands are used to provide ultra-high data rate transmission towards multiple users, ideally not causing interference to each other. Despite that recent studies have examined the benefit of THz spectrum allocation for massive connectivity, e.g., [5], there are several pressing challenges. On one hand, the huge spectrum spanning multiple THz TWs needs to be allocated among all the users in a THzCom system.…”

Section: Massive Connectivity In Thz Communicationsmentioning

confidence: 99%

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Terahertz Communications for Massive Connectivity and Security in 6G and Beyond Era

Yang¹,

Shafie²

2024

IEEE Commun. Mag.

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Terahertz (THz) communications (THzCom) has experienced a meteoric rise of interest, due to its benefits for ultra-high data rate transmission in the sixth generation (6G) and beyond era. Despite so, the research on exploring the potential of THzCom for other performance targets anticipated by 6G, including massive connectivity and security, is still in its infancy. In this article, we start with briefly describing the unique peculiarities of THz channels, and then discuss theoretical frameworks to facilitate the analysis and design of THz transmission for achieving massive connectivity and security. Then we discuss promising spectrum management strategies, including the exploration of multiple THz transmission windows and frequency reuse with multiplexing and signal processing, to substantially increase the number of supported users and identify to-be-tackled challenges. We further present important research directions based on the principles of physical layer security, such as new spectrum allocation policies and beamforming algorithms, to fight against eavesdropping in THzCom systems, ushering in secure THzCom systems.

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Section: Wireless Data Center Military Networkmentioning

confidence: 99%

Section: Massive Connectivity In Thz Communicationsmentioning

confidence: 99%

Terahertz Communications for Massive Connectivity and Security in 6G and Beyond Era

Yang¹,

Shafie²

2024

IEEE Commun. Mag.

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“…where f m is the m-th subcarrier frequency, c 0 is speed of light, r k,l represents the distance from the k-th user to the array origin and k abs (f m ) is the SD medium absorption coefficient [4,32,33]. Furthermore,…”

Section: A Thz Channel Modelmentioning

confidence: 99%

Near-Field Terahertz Communications: Model-Based and Model-Free Channel Estimation

Elbir¹,

Shi²,

Papazafeiropoulos³

et al. 2023

Preprint

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Terahertz (THz) band is expected to be one of the key enabling technologies of the sixth generation (6G) wireless networks because of its abundant available bandwidth and very narrow beam width. Due to high frequency operations, electrically small array apertures are employed, and the signal wavefront becomes spherical in the near-field. Therefore, near-field signal model should be considered for channel acquisition in THz systems. Unlike prior works which mostly ignore the impact of near-field beam-split (NB) and consider either narrowband scenario or far-field models, this paper introduces both a modelbased and a model-free techniques for wideband THz channel estimation in the presence of NB. The model-based approach is based on orthogonal matching pursuit (OMP) algorithm, for which we design an NB-aware dictionary. The key idea is to exploit the angular and range deviations due to the NB. We then employ the OMP algorithm, which accounts for the deviations thereby ipso facto mitigating the effect of NB. We further introduce a federated learning (FL)-based approach as a model-free solution for channel estimation in a multi-user scenario to achieve reduced complexity and training overhead.Through numerical simulations, we demonstrate the effectiveness of the proposed channel estimation techniques for wideband THz systems in comparison with the existing state-of-the-art techniques.

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“…By Lemma 1, we have (44) as claimed, provided that θ (κ+1) = θ (κ) . As the first booster, we use (28) to obtain the following approximated minorant of the objective function in (47) RHS of (47…”

Section: A Approximation Optimizationmentioning

confidence: 99%

Low-Resolution Hybrid Beamforming in Millimeter-Wave Multi-User Systems

Tuan

Dutkiewicz

et al. 2023

IEEE Trans. Veh. Technol.

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A new hybrid amalgam of analog and baseband digital beamforming is conceived for millimeter-wave (mmWave) multi-user networks. The base station is equipped with a largescale antenna-array, which however relies on a limited number of radio frequency chains for mitigating the severe path-loss of mmWave band transmission. Each user is also equipped with a multi-antenna array. The analog beamformer's weight-resolution is set low for the sake of power efficient implementation. The hybrid beamformer design relies on the novel optimization criterion of directly maximizing the geometric means of users' rates, which is shown to result in fair rate-distributions for the users without imposing a minimum user-rate constraint. Furthermore, new computationally efficient algorithms are developed, which are purely based on closed-form low-complexity expressions. Hence these low-complexity solutions are eminently suitable for largescale mmWave arrays. Numerical examples are provided for demonstrating their efficiency.

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Cluster-Based Multi-Carrier Hybrid Beamforming for Massive Device Terahertz Communications

Cited by 19 publications

References 47 publications

Terahertz Communications for Massive Connectivity and Security in 6G and Beyond Era

Terahertz Communications for Massive Connectivity and Security in 6G and Beyond Era

Near-Field Terahertz Communications: Model-Based and Model-Free Channel Estimation

Low-Resolution Hybrid Beamforming in Millimeter-Wave Multi-User Systems

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