High-Speed and Uninterrupted Communication for High-Speed Trains by Ultrafast WDM Fiber–Wireless Backhaul System

Dat, Pham Tien; Kanno, Atsushi; Inagaki, Keizo; Rottenberg, François; Yamamoto, Naokatsu; Kawanishi, Tetsuya

doi:10.1109/jlt.2018.2885548

Cited by 25 publications

(18 citation statements)

References 30 publications

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“…Previously, we demonstrated and confirmed that RoF technology in the MMW band [9] can be implemented using IEEE802.11ad packets [10]. The mechanism of RCSs is based on the use of MMW-RoF technology [4,8,11] to provide distributed prediction-based train tracking and information transferring capability that ensures hand-over-free access to provide the backhaul for in-car passenger Wi-Fi service while monitoring and diagnosing train and railway conditions [12,13,14,15]. In such a system, a central station predicts train location information and switches the optical route radio stations located at 1-km intervals along the train track.…”

Section: Introductionmentioning

confidence: 80%

High-stability, high-signal-quality radio-over-fiber system for IEEE802.11ad packet transmission based on optical single-sideband modulation in W-band

Fujiwara

Kanno

Tokita

2021

IEICE Electron. Express

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To address the communication needs of high-speed trains such as bullet trains, which require high-speed millimeter-wave wireless links, we developed a high-stability radio-over-fiber system to transmit IEEE802.11ad packets using optical single-sideband (SSB) modulation. The system comprises an optical SSB modulator with automatic bias control and a low-distortion millimeter-wave amplifier stage and is capable of generating and transmitting IEEE802.11ad packets with 16-QAM modulation under an error vector magnitude of 5.8% at frequency of 97.57 GHz over a 45.5-km-long single-mode fiber.

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Section: Introductionmentioning

confidence: 80%

High-stability, high-signal-quality radio-over-fiber system for IEEE802.11ad packet transmission based on optical single-sideband modulation in W-band

Fujiwara

Kanno

Tokita

2021

IEICE Electron. Express

Self Cite

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“…We can optimize the deployment scenario by connecting multiple RRUs to a signal Baseband Unit (BBU) to improve the coverage, reduce the dropped calls and the number of HOs [96]. It is good to plan the overlapping coverage between the neighboring cells so that enough time will be available for MRs that reduces the HOF rates effectively [97].…”

Section: B Handover Management In High-speed Scenariosmentioning

confidence: 99%

A Survey on Handover Management: From LTE to NR

2019

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To satisfy the high data demands in future cellular networks, an ultra-densification approach is introduced to shrink the coverage of base station (BS) and improve the frequency reuse. The gain in capacity is expected but at the expense of increased interference, frequent handovers (HOs), increased HO failure (HOF) rates, increased HO delays, increase in ping pong rate, high energy consumption, increased overheads due to frequent HO, high packet losses and bad user experience mostly in high-speed user equipment (UE) scenarios. This paper presents the general concepts of radio access mobility in cellular networks with possible challenges and current research focus. In this article, we provide an overview of HO management in longterm evolution (LTE) and 5G new radio (NR) to highlight the main differences in basic HO scenarios. A detailed literature survey on radio access mobility in LTE, heterogeneous networks (HetNets) and NR is provided. In addition, this paper suggests HO management challenges and enhancing techniques with a discussion on the key points that need to be considered in formulating an efficient HO scheme. INDEX TERMS Radio access mobility, cell selection, handover, LTE, 5G, NR, mobility enhancers. Ph.D. degree in electrical engineering with Aalto University, Finland. He has more than two years, from 2013 to 2015, of professional experience as an RF Planning and Optimization Executive at Wi-Tribe Pakistan Ltd. (Ooredoo Group). During his stay at KFUPM, he was associated with the King Abdullah University of Science and Technology (KAUST), Saudi Arabia, as a Visiting Student and a KFUPM-KAUST Joint Research Initiative. He has been a Researcher with the Helsinki Research Center, Huawei Technologies Finland Oy, since February 2018. His current research interest includes energy-efficient mobility for small-cell overlaid cellular networks. He received the Gold Medal Award for obtaining the first position in the B.Sc. degree. XAVIER GELABERT received the M.Sc. degree in electrical engineering from the KTH Royal Institute of Technology, Stockholm, in 2003, and the joint B.Sc. and M.Sc. degrees in telecom engineering and the Ph.D. degree (Hons.

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“…Through a matrix element expansion of (3), a generic solution was discovered. A desired ESV (termed a d ), in conjunction with its associated γ j s values were derived and presented in (4) and 5, respectively. To explain, the phase delay factor D in (4) was introduced to accommodate a casual signal condition because the conjugate operation incurred a positive slope in the phase frequency curve.…”

Section: Active Load Impedance and Its Dependence On An Esvmentioning

confidence: 99%

mm-Wave Waveguide Traveling-Wave Power Combiner Design Using an Equivalent Circuit Model

et al. 2019

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The waveguide traveling-wave power combiner (WTWPC) falls into the category of asymmetrical non-isolated power combiners, and, therefore, the active load modulation occurring within the combiner was investigated. Proper manipulation of active load modulation gave rise to a two-step design method for the combiner. The first step formulated the specifications of the combiner in terms of active load impedance at its input ports, which determined the objective scattering parameters of the combiner, as well as the desired coherent excitation signals. The second step established a versatile equivalent circuit model to provide a mapping relation between the scattering parameters and the physical dimensions of the combiner. The proposed equivalent circuit method not only offered a close-to-reality description of the existing type of traveling-wave power combiners but also broke new ground for combiner variants that accommodate the more general driving amplifiers. A Q-band quasi-planar traveling-wave waveguide spatial combined amplifier was built to demonstrate the proposed method. The measured P −1dB bandwidth of the prototype was 6 GHz (33-39 GHz). INDEX TERMS Equivalent circuit, load modulation, traveling wave, mm-wave power amplifier, rectangular waveguide, waveguide probe, waveguide iris window.

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High-Speed and Uninterrupted Communication for High-Speed Trains by Ultrafast WDM Fiber–Wireless Backhaul System

Cited by 25 publications

References 30 publications

High-stability, high-signal-quality radio-over-fiber system for IEEE802.11ad packet transmission based on optical single-sideband modulation in W-band

High-stability, high-signal-quality radio-over-fiber system for IEEE802.11ad packet transmission based on optical single-sideband modulation in W-band

A Survey on Handover Management: From LTE to NR

mm-Wave Waveguide Traveling-Wave Power Combiner Design Using an Equivalent Circuit Model

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