New Ground-to-Train High-Speed Free-Space Optical Communication System with Fast Handover Mechanism

Haruyama, Shinichiro; Urabe, Hideki; Shogenji, Tomohiro; Ishikawa, Satoshi; Hiruta, Masato; Teraoka, Fumio; Arita, Tetsuya; Matsubara, Hiroshi; Nakagawa, Shingo

doi:10.1364/ofc.2011.owx4

Cited by 22 publications

(6 citation statements)

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“…However, it has good performance for unmanned vehicles with no weight restrictions [ 108 , 109 , 110 , 111 , 112 , 113 ]. In the OWC system of railway, the ATP mirror-based mechanism is more commonly used, and the primary problem to be solved is the vibration caused by the train during high-speed operation [ 114 , 115 , 116 , 117 , 118 ]. In [ 119 ], the ATP mechanism of micro-electromechanical systems-based and retroreflector-based that was used in UAVs is introduced in detail.…”

Section: Unmanned Aerial Vehicles (Uav) Ground Terminal Optical Wimentioning

confidence: 99%

Frontier Progress of Unmanned Aerial Vehicles Optical Wireless Technologies

Ding

Mei

Chih‐Lin

et al. 2020

Sensors

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With the continuous maturity of unmanned aerial vehicles (UAV) in materials, communications, and other related technologies, the UAV industry has developed rapidly in recent years. In order to cope with the diversified emerging business forms, the explosive growth of the scale of data traffic, number of terminal connections, high reliability, low-latency, and high transmission rate provided by the fifth generation (5G) network will inject new vitality into the development of the UAVs industry. In this paper, optical wireless technology is introduced into the UAV platform, combining theory with practical applications. We explain many research advances and key technologies in the four aspects of “air, space, earth, and sea” to achieve a strong and broadband communication link. This discussion focuses on link modeling, parameter optimization, experimental testing, and the status quo of UAVs in different application scenarios with optical wireless link configurations. At the same time, based on the current situation of UAV optical wireless technology, the technical problems and the research direction in the future are also discussed.

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Section: Unmanned Aerial Vehicles (Uav) Ground Terminal Optical Wimentioning

confidence: 99%

Frontier Progress of Unmanned Aerial Vehicles Optical Wireless Technologies

Ding

Mei

Chih‐Lin

et al. 2020

Sensors

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“…It consisted of multiple FSO transceivers base stations that are 100m apart. It was able to achieve 566Mbps average data rate, with 5% packet loss ratio [5].…”

Section: Fso Applications and Possibilitiesmentioning

confidence: 99%

FSO G2T communications in tropical climate: An overview

Mabrouk

Abdullah

2017

AIP Conference Proceedings

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Abstract.As the demand for high-speed broadband data access on trains increases, so does the interest in finding solutions to satisfy this demand. This paper aims to provide an overview of Free Space Optical (FSO) Link for Ground-to-Train Communication(G2T). It focuses on tropical climate, with illustrations of the technology Challenges, and opportunities. Railway communication challenges are discussed with recent research work. Additionally, FSO G2T modeling techniques for various track configurations are briefly discussed and summarized.

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“…The third example is a Japanese research group, which reported the feasibility of applying free space optic communication technology to fast moving trains. The group recorded a very high data rate of 566 Mbps at a speed of 130 km/h [7]. However, this communication system has yet to be commercialized.…”

Section: Introductionmentioning

confidence: 99%

Mobile Hotspot Network System for High-Speed Railway Communications Using Millimeter Waves

Choi¹,

Chung²,

Kim³

et al. 2016

ETRI Journal

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We propose a millimeter wave (MMW)-based mobile hotspot network (MHN) system for application in high-speed railways that is capable of supporting a peak backhaul link throughput of 1 Gbps per train at 400 km/h. The MHN system can be implemented in subways and high-speed trains to support passengers with smart devices and provide access to the Internet. The proposed system can overcome the inherent high path loss in MMW through system designs and high antenna gains. We present a simulation of the system performance that shows that a fixed beamforming strategy can provide high signal-tointerference-plus-noise-ratio similar to those of an adaptive beamforming strategy, with the exception of 15% of the train path in which the network can use link adaptation with low-order modulation formats or trigger a handover to maintain the connection. We also demonstrate the feasibility of the MHN system using a test bed deployed in Seoul subway line 8. The backhaul link throughput varies instantaneously between 200 Mbps and 500 Mbps depending on the SNR variations while the train is running. During the field trial, the smartphones used could make connections through offloading. Keywords: Millimeter waves, MHN, Railway communication, Doppler shift, High-speed scenarios, 5G.Manuscript received Apr. 15, 2016; revised July 11, 2016; accepted July 20, 2016 I. IntroductionMobile data traffic has been increasing along with the increased usage of smartphones and the evolution of various networks. Cisco has published a white paper that reported that mobile data traffic has grown 4,000-fold over the past ten years, reaching 3.7 exabytes per month as of 2015 [1]. Due to the ubiquity of handheld devices, there is demand for mobile data not only at home and work, but also on buses and trains. Smartphone users are able to connect to the Internet through cellular networks or utilize offloading, if available. Offloading occurs at the user or device level when users are switched from cellular connections to Wi-Fi or small-cell access connections. The white paper [1] disclosed that mobile offloading exceeded cellular traffic in 2015 for the first time. To be specific, 51% of the total amount of mobile data traffic was offloaded onto fixed networks through Wi-Fi or femtocells in 2015. When we consider these statistics, we envision that more and more of the smart devices connected to mobile hotspots, for example, on buses and subway/high-speed trains, will be connected to networks, and a good portion of such traffic will be offloaded through Wi-Fi.Dual-layer, two-tier, or hierarchical two-hop networks are all terms used to describe offloading-related architectures [2], [3]. Offloading can be applied in vehicles using mobile relays that are deployed in the topology. Vehicles, such as subways and high-speed trains, can be viewed as mobile hotspots that have a large number of users at the same location. The smartphones and tablets of users can connect to a network through Wi-Fi access points (APs) inside a train car. To connect to public land mobil...

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New Ground-to-Train High-Speed Free-Space Optical Communication System with Fast Handover Mechanism

Cited by 22 publications

References 0 publications

Frontier Progress of Unmanned Aerial Vehicles Optical Wireless Technologies

Frontier Progress of Unmanned Aerial Vehicles Optical Wireless Technologies

FSO G2T communications in tropical climate: An overview

Mobile Hotspot Network System for High-Speed Railway Communications Using Millimeter Waves

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