THz Seamless Networks for Future Mobile Services

概要

THZ SEAMLESS NETWORKS FOR FUTURE
MOBILE SERVICES
Tetsuya Kawanishi
Faculty of Science and Engineering, Waseda University,
3-4-1 Okubo Shinjuku, Tokyo 166-8555, Japan
THz radio links can offer over 10Gbps high-speed wireless
transmission, where radio spectrum congestion is not yet so
significant in THz bands (0.1-10 THz) [1]. However, even in
THz bands, advanced modulation formats would be required
as well as in conventional millimeter-wave or microwave
bands, to increase spectral efficiency. Spectral efficiency and
transmission capacity of THz communication systems will be
reviewed in this presentation. We will share a survey result
on power consumption of short-distance wireless systems.
Power consumption reduction in radio transmitters is also
very important to reduce operation cost of networks. The
result implies that THz high-speed radio may provide
effective transmission. However, the transmission distance of
THz transmission should be shorter than a few hundred
meters due to attenuation in the air. Thus, we should
construct the THz networks consisting of many THz radiolinks and optical fibers, which are connected by many media
converters. We will discuss issues in such seamless networks.
To offer a real-time THz transmission, the Horizon 2020 EUJapan project ThoR (“TeraHertz end-to-end wireless systems
supporting ultra high data Rate applications”) will develop an
over 100 Gb/s radio transmission system using frequency
band beyond 275 GHz [2]. An ultra-broadband, high linearity
THz transmitter at 300 GHz will be demonstrated by using
photonic local oscillators, multi-functional THz integrated
circuits and traveling-wave tube amplifiers.
1. T. Kawanishi, A. Kanno, and H. S. C. Freire, “Wired and
wireless links to bridge networks: Seamlessly connecting
radio and optical technologies for 5G networks,” IEEE
Microw. Mag., vol. 19, no. 3, pp. 102–111, May 2018.
2. www.ThoRProject.eu
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* This presentation includes research results from works
funded by the MIC/SCOPE #195003004 and JSPS Grants-inAid for Scientific Research Grant Number JP18H01454. The
Thor project is funded by Horizon 2020, the European
Union’s Framework Programme for Research and Innovation,
under grant agreement No. 814523, and by the
Commissioned Research (No. 196) of National Institute of
Information and Communications Technology (NICT), Japan.
This work was also partially supported by Waseda Research
Institute for Science and Engineering. ...