Performance Analysis of a Dual Terahertz/Ka Band Communication System for Satellite Mega-Constellations

Alqaraghuli, Ali J.; Abdellatif, Hussam; Jornet, Josep Miquel

doi:10.1109/wowmom51794.2021.00058

Cited by 16 publications

(7 citation statements)

References 7 publications

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“…A similar observation is made from Fig. 3(b) for a practical range of antenna inequality, L, in the order of 20-30 8 . As expected, the available bandwidth reduces as L increases.…”

Section: B Non-stationary Thz Links In the Far Fieldsupporting

confidence: 81%

“…The widest bandwidth constrained by ( 10) can be achieved when (9) has just one root, so D 1 = x 1 = x 2 . We now recall (8)…”

Section: A General Case and The Limit For A Stationary Thz Linkmentioning

confidence: 99%

“…With the feasibility of stationary (sub-)THz communications thus proven, the research focus shifts to exploring mobile (sub-)THz links as a candidate solution for sixth-generation (6G) networks. Such broadband mobile THz links may be used for bandwidth-hungry extended reality (XR) services [5], joint communications and sensing [6], airborne networks [7], and CubeSat mega constellations [8], among others.…”

Section: Introductionmentioning

confidence: 99%

“…A typical range of an indoor small cell varies from 0.5 m to 25 m (M = 50) and for an outdoor microcell -in between 5 m and 200 m (M = 40) 8. The THz-AP antenna is in the order of up to dozens of cm 2 , while the size of the THz-UE antenna is not exceeding a few mm 2 9.…”

mentioning

confidence: 99%

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Mobile near-field terahertz communications for 6G and 7G networks: Research challenges

2023

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Following the current development of the wireless technology landscape, and with respect to the constant growth in user demands, it is inevitable that next-generation mobile wireless networks will use new frequency bands located in the sub-terahertz and terahertz (THz) spectrum to complement the existing microwave and millimeter wave (mmWave) channels. The feasibility of point-to-point stationary THz communication links has already been experimentally demonstrated. To build upon this breakthrough, one of the pressing research targets is making THz communication systems truly mobile. Achieving this target is especially complicated because mobile THz wireless systems (including WLANs and even cellular access) will often operate in the near-field due to the very large (even though physically small) electrical size of the high-gain antenna systems required for making high-rate communication links feasible at such frequencies. This perspective article presents several key prospective research challenges envisioned on the way to designing efficient mobile near-field THz wireless access as a part of 6G and 7G wireless landscapes.

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“…A similar observation is made from Fig. 3(b) for a practical range of antenna inequality, L, in the order of 20-30 8 . As expected, the available bandwidth reduces as L increases.…”

Section: B Non-stationary Thz Links In the Far Fieldsupporting

confidence: 81%

“…The widest bandwidth constrained by ( 10) can be achieved when (9) has just one root, so D 1 = x 1 = x 2 . We now recall (8)…”

Section: A General Case and The Limit For A Stationary Thz Linkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Mobile near-field terahertz communications for 6G and 7G networks: Research challenges

2023

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“…We also consider the case in which the ground station antenna points toward the sky with a positive tilt θ g . This is a typical representative of 6G non-terrestrial use cases, such as satellite-assisted cellular networks [69], the space Internet [70], and drones and Unmanned Aerial Vehicle (UAV) aerial networks [71], [72]. Figure 12 reports the received power at the satellite for P tx,g = 18.6 dBW and G sat = 20 dBi, and the antenna on the ground tilted by θ g = 30 degrees and θ g = 60 degrees.…”

Section: Link Budget and Rfi Analysismentioning

confidence: 99%

Coexistence and Spectrum Sharing Above 100 GHz

Polese¹,

Cantos-Roman²,

Singh³

et al. 2021

Preprint

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The electromagnetic spectrum plays a fundamental role for the development of the digital society. It enables wireless communications (either between humans or machines) and sensing (for example for Earth exploration, radio astronomy, imaging, and radars, among others). While each of these uses benefits from a larger bandwidth, the spectrum is a finite resource. This introduces competing interests among the different stakeholders of the spectrum, which have led-so far-to rigid policies and spectrum allocations. Recently, the spectrum crunch in the sub-6 GHz bands has prompted communication technologies to move to higher carrier frequencies, where future 6G wireless networks can exploit theoretically very large bandwidths. However, the spectrum above 100 GHz features several narrow, yet numerous sub-bands that are exclusively allocated for passive sensing applications, e.g., for climate and weather monitoring. This prevents the allocation of large contiguous bands to active users of the spectrum, either being communications (which need tens of gigahertz of bandwidth to target terabit-per-second links) or radars. This paper explores how spectrum policy and spectrum technologies can evolve to enable sharing among different stakeholders in the above 100 GHz spectrum, without introducing harmful interference or disrupting either security applications or fundamental science exploration. This portion of the spectrum presents new opportunities to design spectrum sharing schemes, based on novel antenna designs, directional ultra-highrate communications, and active/passive user coordination. The paper provides a tutorial on current regulations above 100 GHz, and highlights how sharing is central to allowing each stakeholder to make the most out of this spectrum. It then defines-through detailed simulations based on standard International Telecommunications Union (ITU) channel and antenna models-scenarios in which active users may introduce harmful interference to passive sensing. Based on this evaluation, it reviews a number of promising techniques that can enable active/passive sharing above 100 GHz. The critical review and tutorial on policy and technologies of this paper have the potential to kickstart future research and regulations that promote safe coexistence between active and passive users above 100 GHz, further benefiting the development of digital technologies and scientific exploration.

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