Gigabit optical wireless communication system for personal area networking

Glushko, B.; Kin, David; Shar, A.

doi:10.3103/s1060992x13020033

Cited by 13 publications

(2 citation statements)

References 10 publications

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“…Although very large bandwidth is available in FSO communication system which operates at IR frequencies, it still holds some issues which limit its use for personal wireless communication like the atmospheric effects on the signal propagation (fog, rain, pollution and dust); high reflection loss; misalignment between transmitter and receiver; and low power link budget due to health safety which limits both transmission range and achievable data rates for FSO communication. It can support up to 10 Gbps of data rate with a proper line of sight (LOS) for Wireless Local Area Network (WLAN) [59]. For non-LOS, much lower data rate has been reported [60].…”

Section: ) Comparison With Mmwave Band Communicationsmentioning

confidence: 99%

MAC Protocols for Terahertz Communication: A Comprehensive Survey

Ghafoor

Boujnah

Rehmani

et al. 2020

IEEE Commun. Surv. Tutorials

111

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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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Section: ) Comparison With Mmwave Band Communicationsmentioning

confidence: 99%

MAC Protocols for Terahertz Communication: A Comprehensive Survey

Ghafoor

Boujnah

Rehmani

et al. 2020

IEEE Commun. Surv. Tutorials

111

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“…[4][5][6][7][8][9] FSO terminal is rigidly attached to some stiff and sturdy structure enough to avoid vibration due to weather or traffic, even though the installation requires labor and time. [10][11][12][13][14] Another drawback of conventional FSO is vulnerability to disturbance to aerial laser transmission. Transmission is interrupted in the moment when any obstacle happens to interfere a line-of-sight of the laser beam.…”

Section: Introductionmentioning

confidence: 99%

Initial alignment method for free space optics laser beam

Shimada

Tashiro

Izumi

et al. 2016

Jpn. J. Appl. Phys.

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The authors have newly proposed and constructed an active free space optics transmission system. It is equipped with a motor driven laser emitting mechanism and positioning photodiodes, and it transmits a collimated thin laser beam and accurately steers the laser beam direction. It is necessary to introduce the laser beam within sensible range of the receiver in advance of laser beam tracking control. This paper studies an estimation method of laser reaching point for initial laser beam alignment. Distributed photodiodes detect laser luminescence at respective position, and the optical axis of laser beam is analytically presumed based on the Gaussian beam optics. Computer simulation evaluates the accuracy of the proposed estimation methods, and results disclose that the methods help us to guide the laser beam to a distant receiver.

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