Impact of beam misalignment on THz wireless systems

Kokkoniemi, Joonas; Boulogeorgos, Alexandros–Apostolos A.; Aminu, Mubarak Umar; Lehtomäki, Janne; Alexiou, Angeliki; Juntti, Markku

doi:10.1016/j.nancom.2020.100302

Cited by 59 publications

(37 citation statements)

References 24 publications

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“…A THz misalignment fading model is proposed in [76] based on the optical receiver's intensity fluctuation derived in [77]. We consider a scenario in which only the Tx antenna experiences 2D shaking, perhaps in a fronthaul scenario where an access point is deployed in roadsides or high buildings [78]. We assume an Rx antenna with a circular effective area, 𝑊 r , of radius γ.…”

Section: F Time-variant Channel Modelmentioning

confidence: 99%

TeraMIMO: A Channel Simulator for Wideband Ultra-Massive MIMO Terahertz Communications

Tarboush

Sarieddeen

Chen

et al. 2021

IEEE Trans. Veh. Technol.

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Following recent advances in terahertz (THz) technology, there is a consensus on the crucial role of THz communications in the next generation of wireless systems. Aiming at catalyzing THz communications research, we propose TeraMIMO, an accurate stochastic MATLAB simulator of statistical THz channels. We simulate ultra-massive multiple-input multipleoutput antenna configurations as critical infrastructure enablers that overcome the limitation in THz communications distances. We consider both line-of-sight and multipath components and propose frequency-and delay-domain implementations for singleand multi-carrier paradigms in both time-invariant and timevariant scenarios. We implement exhaustive molecular absorption computations based on radiative transfer theory alongside alternative sub-THz approximations. We further model THz-specific constraints, including wideband beam split effects, spherical wave propagation, and misalignment fading. We verify TeraMIMO by analogy with measurement-based channel models in the literature and ergodic capacity analysis. We introduce a graphical user interface and a guide for using TeraMIMO in THz channel generation and analyses.

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Section: F Time-variant Channel Modelmentioning

confidence: 99%

TeraMIMO: A Channel Simulator for Wideband Ultra-Massive MIMO Terahertz Communications

Tarboush

Sarieddeen

Chen

et al. 2021

IEEE Trans. Veh. Technol.

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“…The challenge of handling beam misalignment induced by user mobility in THz wireless systems has been addressed in recent articles [7]- [10]. In [7], the impact of beam misalignment on the received signal gain is investigated for different antenna movement models.…”

Section: A Prior Artmentioning

confidence: 99%

Reliable Beam Tracking with Dynamic Beamwidth Adaptation in Terahertz (THz) Communications

Karacora¹,

Chaccour²,

Sezgin³

et al. 2022

Preprint

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THz communication is regarded as one of the potential key enablers for next-generation wireless systems. While THz frequency bands provide abundant bandwidths and extremely high data rates, the operation at THz bands is mandated by short communication ranges and narrow pencil beams, which are highly susceptible to user mobility and beam misalignment as well as channel blockages. This raises the need for novel beam tracking methods that take into account the tradeoff between enhancing the received signal strength by increasing beam directivity, and increasing the coverage probability by widening the beam. To address these challenges, a multi-objective optimization problem is formulated with the goal of jointly maximizing the ergodic rate and minimizing the outage probability subject to transmit power and average overhead constraints. Then, a novel parameterized beamformer with dynamic beamwidth adaptation is proposed. In addition to the precoder, an event-based beam tracking approach is introduced that enables reacting to outages caused by beam misalignment and dynamic blockage while maintaining a low pilot overhead. Simulation results show that our proposed beamforming scheme improves average rate performance and reduces the amount of communication outages caused by beam misalignment.Moreover, the proposed event-triggered channel estimation approach enables low-overhead yet reliable communication.

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“…Nevertheless, the highly-directional antennas are extremely susceptible to the random motion of antennas, which originates in traffic, wind, and so on. As a consequence, it easily causes the problem of antenna alignment, and hence the pointing error is one of the paramount factors influencing the performance of THz wireless communications [21].…”

Section: Misalignment Fadingmentioning

confidence: 99%

“…As stated in the previous work [21,64], the random motion of antennas can be modeled as the Gaussian movement. Furthermore, assuming the elevation and the horizontal sways follow independent identical Gaussian distributions, the radial distance obeys a Rayleigh distribution [60].…”

Section: Misalignment Fadingmentioning

confidence: 99%

“…One issue is that the energy of a THz wave can be easily absorbed by the atmospheric molecules, resulting in absorption peaks at resonant frequencies and making the THz frequency band split into several transmission windows [20]. Usually, high gain antennas are widely needed in THz systems owing to the presence of severe path loss, leading to misalignment fading [21]. Besides, the multipath fading in the THz band is also different from that in the radio/mmWave band [19].…”

Section: Introductionmentioning

confidence: 99%

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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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Impact of beam misalignment on THz wireless systems

Cited by 59 publications

References 24 publications

TeraMIMO: A Channel Simulator for Wideband Ultra-Massive MIMO Terahertz Communications

TeraMIMO: A Channel Simulator for Wideband Ultra-Massive MIMO Terahertz Communications

Reliable Beam Tracking with Dynamic Beamwidth Adaptation in Terahertz (THz) Communications

THz channel modeling: Consolidating the road to THz communications

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