Advances of terahertz research and terahertz satellite communications

Dong, Shi-Wei; Zhu, Zhongbo; Wang, Ying

doi:10.1109/icecc.2011.6067937

Cited by 11 publications

(5 citation statements)

References 5 publications

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“…Some early studies have explored the possibilities of ISL communications [219], [220], and a capacity analysis in [221] for an ISL was conducted where 100 Gbps were achieved at a relatively short-range communications distance of 1 km operating at 340 GHz and 2.5 Gbps at 100 km inter-satellite distance, with the later requiring a 62 dBi gain antenna, 50 cm aperture area and an output power of 1 W. Nie et al [222], considered the propagation effects present in near-earth and deep-space channels and developed a channel model to investigate diversity techniques used to achieve higher throughput. Their analysis has shown that near-earth channel propagation in the ionosphere does not affect the THz link significantly while for the deep-space channel only major solar activity can cause angular instabilities.…”

Section: ) Hst Communicationsmentioning

confidence: 99%

Terahertz Channel Propagation Phenomena, Measurement Techniques and Modeling for 6G Wireless Communication Applications: a Survey, Open Challenges and Future Research Directions

Serghiou¹,

Khalily²,

Brown³

et al. 2022

Preprint

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The Terahertz (THz) band (0.1-3.0 THz) spans a great portion of the Radio Frequency (RF) spectrum that is mostly unoccupied and unregulated. It is a potential candidate for application in Sixth-Generation (6G) wireless networks as it has the capabilities of satisfying the high data rate and capacity requirements of future wireless communication systems. Profound knowledge of the propagation channel is crucial in communication systems design which nonetheless, is still at its infancy as channel modeling at THz frequencies has been mostly limited to characterizing fixed Point-to-Point (P2P) scenarios up to 300 GHz. Provided the technology matures enough and models adapt to the distinctive characteristics of the THz wave, future wireless communications systems will enable a plethora of new use cases and applications to be realized in addition to delivering higher spectral efficiencies that would ultimately enhance the Quality-of-Service (QoS) to the end user. In this paper, we provide an insight into THz channel propagation characteristics, measurement capabilities and modeling methods along with recommendations that will aid in the development of future models in the THz band. We survey the most recent and important measurement campaigns and modeling efforts found in literature based on the use cases and system requirements identified. Finally, we discuss the challenges and limitations of measurements and modeling at such high frequencies and contemplate the future research outlook toward realizing the 6G vision.

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Section: ) Hst Communicationsmentioning

confidence: 99%

Terahertz Channel Propagation Phenomena, Measurement Techniques and Modeling for 6G Wireless Communication Applications: a Survey, Open Challenges and Future Research Directions

Serghiou¹,

Khalily²,

Brown³

et al. 2022

Preprint

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“…The point-to-point communication can also be utilized in military applications between air to air and ground machines [99], [100]. For many years, space agencies such as NASA and ESA, are developing sensors and instruments for space technology [101], [102], [125], [126]. Using THz link for intra satellite application can be feasible outside the atmospheric region, where the only free space loss is considered.…”

Section: A Applications For Macro Scale Terahertz Networkmentioning

confidence: 99%

MAC Protocols for Terahertz Communication: A Comprehensive Survey

Ghafoor

Boujnah

Rehmani

et al. 2020

IEEE Commun. Surv. Tutorials

107

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Terahertz communication is emerging as a future technology to support Terabits per second link with highlighting features as high throughput and negligible latency. However, the unique features of the Terahertz band such as high path loss, scattering, and reflection pose new challenges and results in short communication distance. The antenna directionality, in turn, is required to enhance the communication distance and to overcome the high path loss. However, these features in combine negate the use of traditional medium access protocols (MAC). Therefore, novel MAC protocol designs are required to fully exploit their potential benefits including efficient channel access, control message exchange, link establishment, mobility management, and line-of-sight blockage mitigation. An in-depth survey of Terahertz MAC protocols is presented in this paper. The paper highlights the key features of the Terahertz band which should be considered while designing an efficient Terahertz MAC protocol, and the decisions which if taken at Terahertz MAC layer can enhance the network performance. Different Terahertz applications at macro and nano scales are highlighted with design requirements for their MAC protocols. The MAC protocol design issues and considerations are highlighted. Further, the existing MAC protocols are also classified based on network topology, channel access mechanisms, and link establishment strategies as Transmitter and Receiver initiated communication. Open challenges and future research directions on Terahertz MAC protocols are also highlighted. Index Terms-Terahertz band, terahertz communication network, terahertz technology, terahertz physical layer, terahertz MAC layer, terahertz channel model, terahertz propagation model, terahertz antenna, terahertz transceivers. I. INTRODUCTION T HE DEMAND for wireless data traffic has increased significantly since the evolution of Internet and Mobile Technology and is projected to exceed Petabytes by 2021 [1].

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“…Terahertz research has expanded recently to more dedicated efforts in extreme-environment systems such as satellite and space-based electronics [95][96][97][98]. For space-based applications terahertz has several advantages over conventional RF communications: (1) higher data rate due to wider channel bandwidth, (2) improved security from narrower beam widths and higher attenuation in the atmosphere, and (3) compact size/volume (e.g., smaller antenna size for same directivity) [99], which may also reduce launching costs. In comparison to laser-based communication systems, terahertz systems can also have a much more reliable link establishment between terrestrial stations and satellites under varying whether conditions [100,101].…”

Section: Space-based Terahertz Systemsmentioning

confidence: 99%

A Perspective on Terahertz Next-Generation Wireless Communications

et al. 2019

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In the past year, fifth-generation (5G) wireless technology has seen dramatic growth, spurred on by the continuing demand for faster data communications with lower latency. At the same time, many researchers argue that 5G will be inadequate in a short time, given the explosive growth of machine connectivity, such as the Internet-of-Things (IoT). This has prompted many to question what comes after 5G. The obvious answer is sixth-generation (6G), however, the substance of 6G is still very much undefined, leaving much to the imagination in terms of real-world implementation. What is clear, however, is that the next generation will likely involve the use of terahertz frequency (0.1–10 THz) electromagnetic waves. Here, we review recent research in terahertz wireless communications and technology, focusing on three broad topic classes: the terahertz channel, terahertz devices, and space-based terahertz system considerations. In all of these, we describe the nature of the research, the specific challenges involved, and current research findings. We conclude by providing a brief perspective on the path forward.

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Advances of terahertz research and terahertz satellite communications

Cited by 11 publications

References 5 publications

Terahertz Channel Propagation Phenomena, Measurement Techniques and Modeling for 6G Wireless Communication Applications: a Survey, Open Challenges and Future Research Directions

Terahertz Channel Propagation Phenomena, Measurement Techniques and Modeling for 6G Wireless Communication Applications: a Survey, Open Challenges and Future Research Directions

MAC Protocols for Terahertz Communication: A Comprehensive Survey

A Perspective on Terahertz Next-Generation Wireless Communications

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