RF and Optical Hybrid LEO Communication System for Non-Terrestrial Network

Eishima, Takashi; Inoue, Soichiro; Yonemoto, A.; Sudo, Jumpei; Hosonuma, Takayuki; Nakasuka, Shinichi; Shirane, Atsushi; Tomura, Takashi; Okada, Kei; Kiyohara, Kosuke

doi:10.1109/icsos53063.2022.9749737

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…As an unprecedented technological challenge, it is worth highlighting that CubeSOTA aims to demonstrate the most efficient optical transmission to date from a CubeSat, with a beam divergence several times narrower than previous experiments owing to the use of the FX's 9 cm telescope. Lastly, under the NICT's B5G Function Realization Program [30], a version adapted for LEO constellation is being designed based on the FX terminal with the goal of integration and deployment within the Axelspace's Earth observation satellite constellation [31]. The plan includes implementing five lasercom terminals per 100 kg class satellite (two for intraplane ISL, two for interplane ISL, and one for LEO-ground or LEO-user) in a Walker constellation of 20 orbital planes and 20 satellites per plane (see Figure 20).…”

Section: Terminals' Validation and Demonstration Plansmentioning

confidence: 99%

Miniaturized Multi-Platform Free-Space Laser-Communication Terminals for Beyond-5G Networks and Space Applications

Carrasco-Casado,

Shiratama,

Kolev

et al. 2024

Photonics

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Beyond-5G (B5G) technology plays a pivotal role in the next generation of communication infrastructure to support the future Society 5.0, a concept introduced in the 5th Basic Plan for Science and Technology by the Japanese Cabinet to define the long-term growth strategy for reconciling economic development with the resolution of social issues through the promotion of science and technologies. Free-space laser communication is a key element in boosting the data transmission capabilities required for B5G applications. The NICT will complete in 2024 the first fully functional prototypes of a series of miniaturized laser-communication terminals for multiple platforms. These terminals are designed to adapt to a wide range of requirements to address scenarios where laser communications can offer a competitive, enhanced solution compared to existing technologies. This paper provides an overview of these terminals’ capabilities and the plans for their functional validation, as well as preliminary data from the first full-system tests. A number of innovations integrated into the terminals are introduced, such as the manufacture of the smallest miniaturized EDFA with integrated HPA and LNA and full space qualification to date, the first-ever integration of a beam-divergence control system in a practical communication terminal, the development of the most compact Tbit/s-class modem prototype documented in the literature, and the smallest gimbal design integrated in a lasercom terminal. Furthermore, this paper outlines the mid-term plans for demonstration in the most significant realistic scenarios, emphasizing the use of High-Altitude Platform Stations (HAPSs) and ultra-small satellites.

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Section: Terminals' Validation and Demonstration Plansmentioning

confidence: 99%

Miniaturized Multi-Platform Free-Space Laser-Communication Terminals for Beyond-5G Networks and Space Applications

Carrasco-Casado,

Shiratama,

Kolev

et al. 2024

Photonics

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“…The path-loss in the THz band is very sensitive to humidity and transmitter-to-receiver distance [128,129]. To circumvent this, non-LoS communication is desired; however, in the case of THz, non-LoS communication is limited to the surface material and second order reflections [130,131]. The deployment of highly directed dynamic massive MIMO antennas is a possible solution.…”

Section: Smart Citiesmentioning

confidence: 99%

Low Altitude Satellite Constellation for Futuristic Aerial-Ground Communications

Sabuj¹,

Alam²,

Haider³

et al. 2023

Computer Modeling in Engineering &Amp; Sciences

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This paper discusses the significance and prospects of low altitude small satellite aerial vehicles to ensure smooth aerial-ground communications for next-generation broadband networks. To achieve the generic goals of fifthgeneration and beyond wireless networks, the existing aerial network architecture needs to be revisited. The detailed architecture of low altitude aerial networks and the challenges in resource management have been illustrated in this paper. Moreover, we have studied the coordination between promising communication technologies and low altitude aerial networks to provide robust network coverage. We talk about the techniques that can ensure userfriendly control and monitoring of the low altitude aerial networks to bring forth wireless broadband connectivity to a new dimension. In the end, we highlight the future research directions of aerial-ground communications in terms of access technologies, machine learning, compressed sensing, and quantum communications.

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