Terahertz wireless data communication

Akkaş, Mustafa Alper

doi:10.1007/s11276-017-1548-4

Cited by 33 publications

(27 citation statements)

References 27 publications

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“…6 c,d. However, we note that atmospheric attenuation is mainly due to the absorption of water vapor and oxygen in THz domain 16 , and it could be even > 100 dB/km as f is > 0.5 THz 16 , 21 . Although atmospheric attenuation is one important effect in THz communications, we still assume there is no atmospheric attenuation and neglect its effects on the system performance, except for Fig.…”

Section: Methodsmentioning

confidence: 85%

“…Instead of building our own modal to consider the absorption, we directly refer to the value of the absorption loss from Ref. 21 . Namely, we firstly use our multiple phase plate model to simulate the power distribution on each OAM mode.…”

Section: Resultsmentioning

confidence: 99%

“…In Ref. 21 , based on the radiative transfer theory together with the information from the HITRA (HIgh resolution TRANsmission molecular absorption) database, the absorption loss is calculated by adding all the molecule absorption. The total absorption loss can be expressed as , where the frequency-related coefficient is selected as ~ 0.11 dB/m at 0.5 THz 21 , and L is the propagation distance.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, Fig. 6 c,d show the link performance with atmospheric absorption loss, which is selected as ~ 11 dB per 100-m propagation at 0.5 THz 21 . We note that the signal power decreases by > 100 dB when compared with the 1-km link without considering the atmospheric absorption.…”

Section: Resultsmentioning

confidence: 99%

“…There might also be power leaked to neighbouring LG l,p modes with non-zero p values; (ii) We focus on atmospheric turbulence and explore atmospheric attenuation a little bit. Atmospheric dispersion also affects THz communications, leading to different phase delays at different frequencies 21 ; (iii) We assume atmospheric turbulence is time invariant. However, in a practical THz OAM link, many factors including air pressure variation and wind velocity might result in fluctuation of both amplitude and phase of THz beams 25 ; (iv) We focus on link distances of 100 m to 1 km.…”

Section: Discussionmentioning

confidence: 99%

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Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams

Zhao

Zhang

Song

et al. 2021

Sci Rep

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Orbital-angular-momentum (OAM) multiplexing has been utilized to increase the channel capacity in both millimeter-wave and optical domains. Terahertz (THz) wireless communication is attracting increasing attention due to its broadband spectral resources. Thus, it might be valuable to explore the system performance of THz OAM links to further increase the channel capacity. In this paper, we study through simulations the fundamental system-degrading effects when using multiple OAM beams in THz communications links under atmospheric turbulence. We simulate and analyze the effects of divergence, turbulence, limited-size aperture, and misalignment on the signal power and crosstalk of THz OAM links. We find through simulations that the system-degrading effects are different in two scenarios with atmosphere turbulence: (a) when we consider the same strength of phasefront distortion, faster divergence (i.e., lower frequency; smaller beam waist) leads to higher power leakage from the transmitted mode to neighbouring modes; and (b) however, when we consider the same atmospheric turbulence, the divergence effect tends to affect the power leakage much less, and the power leakage increases as the frequency, beam waist, or OAM order increases. Simulation results show that: (i) the crosstalk to the neighbouring mode remains < − 15 dB for a 1-km link under calm weather, when we transmit OAM + 4 at 0.5 THz with a beam waist of 1 m; (ii) for the 3-OAM-multiplexed THz links, the signal-to-interference ratio (SIR) increases by ~ 5–7 dB if the mode spacing increases by 1, and SIR decreases with the multiplexed mode number; and (iii) limited aperture size and misalignment lead to power leakage to other modes under calm weather, while it tends to be unobtrusive under bad weather.

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Section: Methodsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams

Zhao

Zhang

Song

et al. 2021

Sci Rep

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Machine learning for wearable IoT‐based applications: A survey

Al‐Turjman

Baali

2019

Trans Emerging Tel Tech

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This paper gives an overview about applying machine learning (ML) in wearable Wireless Body Area Network (WBAN). It highlights the main challenges and open issues for deploying ML models in such sensitive networks. The WBAN is an emerging technology in the last few years, which attracts lots of interest from the academic and industrial communities. It enables a wide range of IoT‐based applications in medical, lifestyle, sport, and entertainment. WBAN are constrained in many aspects such as those related to power resources, communication capabilities, and computation power. Moreover, these networks generate ample amount of sensory data. To overcome the limitations of these networks and make use of the big data generated, artificial intelligence is the best way to deal with gigantic data and help in automating several aspects of the network and its applications. This survey paper aims at reporting numerous ways ML is used to benefit these networks, the design factors that are considered when implementing the ML algorithms, and the communication technologies used in connecting wearable WBAN in the IoT era. The reported studies are based on real overviewed experiment and extensive simulation results.

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Terahertz Waves in Archaeology

Cacciari

2022

Handbook of Cultural Heritage Analysis

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Terahertz wireless data communication

Cited by 33 publications

References 27 publications

Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams

Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams

Machine learning for wearable IoT‐based applications: A survey

Terahertz Waves in Archaeology

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