Optical wireless: the story so far

Heatley, David; Wisely, Dave; Neild, I.; Cochrane, Peter

doi:10.1109/35.735881

Cited by 194 publications

(79 citation statements)

References 2 publications

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“…They provide high security, low cost, low power, and high rates due to the unregulated bandwidth [1]. Such links are suitable for 1-2 Gb/s rates over distances in the range of 1-5 km.…”

Section: Introductionmentioning

confidence: 99%

Outage Capacity Optimization for Free-Space Optical Links With Pointing Errors

Farid

Hranilovic

2007

J. Lightwave Technol.

1,288

927

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Abstract-We investigate the performance and design of free-space optical (FSO) communication links over slow fading channels from an information theory perspective. A statistical model for the optical intensity fluctuation at the receiver due to the combined effects of atmospheric turbulence and pointing errors is derived. Unlike earlier work, our model considers the effect of beam width, detector size, and jitter variance explicitly. Expressions for the outage probability are derived for a variety of atmospheric conditions. For given weather and misalignment conditions, the beam width is optimized to maximize the channel capacity subject to outage. Large gains in achievable rate are realized versus using a nominal beam width. In light fog, by optimizing the beam width, the achievable rate is increased by 80% over the nominal beam width at an outage probability of 10 −5 . Well-known error control codes are then applied to the channel and shown to realize much of the achievable gains.Index Terms-Atmospheric turbulence, beam misalignment, free-space optical (FSO) communications, optical channel capacity, outage probability, pointing errors.

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“…They provide high security, low cost, low power, and high rates due to the unregulated bandwidth [1]. Such links are suitable for 1-2 Gb/s rates over distances in the range of 1-5 km.…”

Section: Introductionmentioning

confidence: 99%

Outage Capacity Optimization for Free-Space Optical Links With Pointing Errors

Farid

Hranilovic

2007

J. Lightwave Technol.

1,288

927

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“…Many authors have discussed how VLC and RF systems are complementary technologies [9]. VLC can deliver high capacity to multiple users within a small cell through the use of diffuse and spotlighting coverage while an RF system can produce a much larger cell at lower capacity.…”

Section: Related Workmentioning

confidence: 99%

A hybrid Radio Frequency and broadcast Visible Light Communication system

Rahaim

Vegni

Little

2011

2011 IEEE GLOBECOM Workshops (GC Wkshps)

204

117

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Abstract-Wireless network data consumption is experiencing drastic increases due to growing demands of mobile services and applications. Deployed networks using Radio Frequency (RF) communications are characterized by a shared medium, limited available spectrum and limited ability to scale with increasing demand. Directional communications, including Visible Light Communications (VLC), can limit contention in controlled environments and provide scalability through spatial reuse of the medium. This solution can provide massive aggregate data capacity in indoor scenarios if properly distributed.In this paper we propose an indoor hybrid system that integrates WiFi and VLC luminaries. Our system utilizes (i) broadcast VLC channels to supplement RF communications and (ii) a handover mechanism between WiFi and VLC to dynamically distribute resources and optimize system throughput. This approach offers the bandwidth density benefits of VLC, provides a non-intrusive RF back-channel, maintains compatibility with conventional RF devices, and demonstrates excellent scalability. Analytical and simulation results show improvements in aggregate performance (i.e., throughput and delay) of the hybrid, when compared to either system acting alone.

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“…[11] . 따라서 충분한 세기와 넓은 변 조 대역폭을 제공해 주기 위해 edge emitting LD를 기초로 가시광 송수신기를 제작하였으며 laser source에 적용된 나안보호(eye safety) 규정을 피하 기 위해 광 확산기(optical diffuser)를 레이저 출력 단에 연결하여 빛을 분산시키는 방법을 사용하였다 [12] . …”

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