A Holistic Investigation of Terahertz Propagation and Channel Modeling toward Vertical Heterogeneous Networks

Tekbıyık, Kürşat; Ekti, Ali Rıza; Kurt, Güneş Karabulut; Görçin, Ali; Yanıkömeroğlu, Halim

doi:10.1109/mcom.001.2000302

Cited by 51 publications

(36 citation statements)

References 12 publications

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“…THz communication is celebrated to be one of the emerging technologies for B5G wireless communications thanks to the abundance of unexplored available spectrum (0.1 − 10THz) and the potentiality of fulfilling remarkable wireless capacity enhancement [15]- [18]. Recently, THz transmissions have been investigated for UAV communication applications [19], [20].…”

Section: B Thz and Irs Technologiesmentioning

confidence: 99%

“…Furthermore, κ(f c , µ) represents the overall molecular absorption coefficient of THz channels as a function of f c and the volume of the mixing ratio of water vapor µ, describing the relative absorbing area of the molecules in the wireless medium per unit volume. It should be stressed that the main cause of absorption loss in THz frequency ranges is the water vapor molecules that cause a discrete but deterministic loss to the signals in the frequency domain [18], [59].…”

Section: E Channel Modelingmentioning

confidence: 99%

“…Note that more practical channel modelling and system design for THz propagation is yet to be fully understood, and indeed, requires sophisticated site measurement campaigns and dedicated research efforts, which we leave as a future work[18].…”

mentioning

confidence: 99%

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Aerial Intelligent Reflecting Surface Enabled Terahertz Covert Communications in Beyond-5G Internet of Things

Mamaghani¹,

Hong²

2022

Preprint

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<div>Unmanned aerial vehicles (UAVs) are envisioned to be extensively employed for assisting wireless communications in Internet of Things (IoT). </div><div>On the other hand, terahertz (THz) enabled intelligent reflecting surface (IRS) is expected to be one of the core enabling technologies for forthcoming beyond-5G wireless communications that promise a broad range of data-demand applications. In this paper, we propose a UAV-mounted IRS (UIRS) communication system over THz bands for confidential data dissemination from an access point (AP) towards multiple ground user equipments (UEs) in IoT networks. Specifically, the AP intends to send data to the scheduled UE, while unscheduled UEs may behave as potential adversaries. To protect information messages and the privacy of the scheduled UE, we aim to devise an energy-efficient multi-UAV covert communication scheme, where the UIRS is for reliable data transmissions, and an extra UAV is utilized as a cooperative jammer generating artificial noise (AN) to degrade unscheduled UEs detection, improving communication covertness.</div><div>This poses a novel max-min optimization problem in terms of minimum average energy efficiency (mAEE), targetting to improve covert throughput and reduce UAVs' propulsion energy consumption subject to some practical constraints such as covertness which is determined analytically. Since the optimization problem is non-convex, we tackle it via the block successive convex approximation (BSCA) approach to iteratively solve a sequence of approximated convex sub-problems, designing the binary user scheduling, AP's power allocation, maximum AN jamming power, IRS beamforming, and both UAVs' trajectory and velocity planning. Finally, we present a low-complex overall algorithm for system performance enhancement with complexity and convergence analysis. Numerical results are provided to verify our analysis and demonstrate significant outperformance of our design over other existing benchmark schemes.</div>

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Section: B Thz and Irs Technologiesmentioning

confidence: 99%

Section: E Channel Modelingmentioning

confidence: 99%

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Aerial Intelligent Reflecting Surface Enabled Terahertz Covert Communications in Beyond-5G Internet of Things

Mamaghani¹,

Hong²

2022

Preprint

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“…where ζ k [n] = 1 if user k is scheduled at time slot n, and ζ k [n] = 0, otherwise. Further, the transmit powers of the UUR, the BS, and k-th user in time slot n, denoted respectively as 3 It is worth stressing that THz transmissions generally admit various peculiarities such as molecular absorption effect, spectral broadening, frequency selectivity, and so forth [33], [40]. In light of this, to confront the highly frequency selectivity nature in THz band, the total bandwidth of the THz frequencies is generally divided into several sub-bands [41].…”

Section: Ii-b Constraints On User Scheduling Power Uav's Mobilitymentioning

confidence: 99%

Terahertz Meets Untrusted UAV-Relaying: Minimum Secrecy Energy Efficiency Maximization via Trajectory and Communication Co-design

Mamaghani¹,

Hong²

2022

Preprint

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Unmanned aerial vehicles (UAVs) and Terahertz (THz) technology are envisioned to play paramount roles in next-generation wireless communications. In this paper, we present a novel secure UAV-assisted mobile relaying system operating at THz bands for data acquisition from multiple ground user equipments (UEs) towards a destination. We assume that the UAV-mounted relay may act, besides providing relaying services, as a potential eavesdropper called the untrusted UAV-relay (UUR). To safeguard end-to-end communications, we present a secure two-phase transmission strategy with cooperative jamming. Then, we devise an optimization framework in terms of a new measure − secrecy energy efficiency (SEE), defined as the ratio of achievable average secrecy rate to average system power consumption, which enables us to obtain the best possible security level while taking UUR's inherent flight power limitation into account. For the sake of quality of service fairness amongst all the UEs, we aim to maximize the minimum SEE (MSEE) performance via the joint design of key system parameters, including UUR's trajectory and velocity, communication scheduling, and network power allocation. Since the formulated problem is a mixed-integer nonconvex optimization and computationally intractable, we decouple it into four subproblems and propose alternative algorithms to solve it efficiently via greedy/sequential block successive convex approximation and non-linear fractional programming techniques. Numerical results demonstrate significant MSEE performance improvement of our designs compared to other known benchmarks.<br>

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“…Although the misalignment fading induced by highly-directional antennas triggers a drastic decrease of the received power [65], such as up to 13 dB power decrease for 20 • tilts [66], it is still worth of rewarding for THz wireless networks with particular respects.…”

Section: Misalignment Fadingmentioning

confidence: 99%

THz channel modeling: Consolidating the road to THz communications

Liu

Guo

et al. 2021

China Commun.

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For the sake of meeting the demand of data rates at terabit (Tbit) per second scale in future networks, the terahertz (THz) band is widely accepted as one of the potential key enabling technologies for next generation wireless communication systems. With the progressive development of THz devices, regrading THz communications at system level is increasing crucial and captured the interest of plenty of researchers. Within this scope, THz channel modeling serves as an indispensable and fundamental element. By surveying the latest literature findings, this paper reviews the problem of channel modeling in the THz band, with an emphasis on molecular absorption loss, misalignment fading and multipath fading, which are major influence factors in the THz channel modeling. Then, we focus on simulators and experiments in the THz band, after which we give a brief introduction on applications of THz channel models with respects to capacity, security, and sensing as examples. Finally, we discuss some key issues in the future THz channel modeling.

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A Holistic Investigation of Terahertz Propagation and Channel Modeling toward Vertical Heterogeneous Networks

Cited by 51 publications

References 12 publications

Aerial Intelligent Reflecting Surface Enabled Terahertz Covert Communications in Beyond-5G Internet of Things

Aerial Intelligent Reflecting Surface Enabled Terahertz Covert Communications in Beyond-5G Internet of Things

Terahertz Meets Untrusted UAV-Relaying: Minimum Secrecy Energy Efficiency Maximization via Trajectory and Communication Co-design

THz channel modeling: Consolidating the road to THz communications

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