Implementation of a low cost short-haul optical wireless link
04 Dec 2009-pp 1-4
TL;DR: This paper demonstrates the implementation of a 100 m optical wireless link capable of supporting 10 Mbps, which is a relatively low data rate considering the main applications of voice and messaging in these regions.
Abstract: There lies a big economical challenge in providing network connectivity to rural regions in the developing world. Most of the existing connectivity technologies incur a high deployment cost that limits their affordability. Optical Wireless Communication provides a low cost solution which can be used for Last Mile Access. This paper demonstrates the implementation of a 100 m optical wireless link capable of supporting 10 Mbps. The total cost of building the link is within 20 USD. The relatively low data rate is chosen considering the main applications of voice and messaging in these regions. The low cost has been achieved by designing our own transmitter and receiver circuits. The components used to build the link have been mentioned in the paper to substantiate the claim of low cost.
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31 Aug 1994TL;DR: The use of infrared radiation as a medium for high-speed short-range wireless digital communication, and several modification formats, including on-off keying (OOK), pulse-position modulation (PPM), and subcarrier modulation, are discussed.
Abstract: The use of infrared radiation as a medium for high-speed short-range wireless digital communication is discussed. Available infrared links and local-area networks are described. Advantages and drawbacks of the infrared medium are compared to those of radio and microwave media. The physical characteristics of infrared channels using intensity modulation with direct detection (IM/DD) are presented including path losses and multipath responses. Natural and artificial ambient infrared noise sources are characterized. Strategies for designs of transmitter and receivers that maximize link signal-to-noise ratio (SNR) are described. Several modification formats are discussed in detail, including on-off keying (OOK) pulse-position modulation (PPM), and subcarrier modulation. The performance of these techniques in the presence of multipath distortion is quantified. Techniques for multiplexing the transmissions of different users are reviewed. The performance of an experimental 50-Mb/s on-off-keyed diffuse infrared link is described.
2,972 citations
Book•
01 Nov 2001
TL;DR: Free Space Optics will begin with the fundamentals of the technology before launching into FSO topologies, deployment issues, applications, and case studies.
Abstract: From the Publisher:
Free Space Optics will begin with the fundamentals of the technology before launching into FSO topologies, deployment issues, applications, and case studies.
482 citations
TL;DR: A broad review of the optical wireless field is presented, from early experiments through to today's high-performance systems, with emphasis on understanding the benefits and limitations of optical wireless.
Abstract: We present a broad review of the optical wireless field, from early experiments through to today's high-performance systems. Emphasis is placed on understanding the benefits and limitations of optical wireless, all of which ultimately define the applications. A variety of systems are examined, each incorporating a different technological solution to suit the particular application.
261 citations
TL;DR: Research designed to improve the performance of free-space optical wireless networks along terrestrial paths is described, including the effects of atmospheric turbulence, obscuration, transmitter and receiver design, and topology control.
Abstract: The worldwide demand for broadband communications is being met in many places by installed single-mode fiber networks. However, there is still a significant "first-mile" problem, which seriously limits the availability of broadband Internet access. Free-space optical wireless communications has emerged as a viable technology for bridging gaps in existing high-data-rate communications networks, and as a temporary backbone for rapidly deployable mobile wireless communication infrastructure. In this article we describe research designed to improve the performance of such networks along terrestrial paths, including the effects of atmospheric turbulence, obscuration, transmitter and receiver design, and topology control.
221 citations
"Implementation of a low cost short-..." refers background in this paper
...Free Space Optical (FSO) communication is also unaffected by electromagnetic interference and radio frequency interference, which increasingly effect radio based communication systems [ 1 ]....
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01 Jul 2007
TL;DR: This contribution presents a review of infrared and visible light optical wireless indoor communications, including basics, state of the art, challenges and prospects, which show potential to achieve both high spatial coverage and high bit rates of more than 100 Mb/s.
Abstract: For future short-range applications, optical wireless communications present a viable and promising supplemental technology to radio wireless systems. This contribution presents a review of infrared and visible light optical wireless indoor communications, including basics, state of the art, challenges and prospects. Advanced approaches based on diversity techniques and adaptive signal processing show potential to achieve both high spatial coverage and high bit rates of more than 100 Mb/s.
112 citations