Indoor Gigabit optical wireless communications: Challenges and possibilities

Minh, Hoa Le; Ghassemlooy, Zabih; O’Brien, Dominic; Faulkner, Grahame

doi:10.1109/icton.2010.5549136

Cited by 53 publications

(25 citation statements)

References 15 publications

(19 reference statements)

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“…The feed-forward filter is driven by the received signals from the sensor, and the feed-backward filter is driven by decisions on the output of the equalizer, whose weight vector is adjustable to cancel the lSI on the current symbol from past detected symbols [6]. The output of the equalizer can be expressed as (2) i =l…”

Section: Blind Decision Feedback Equalizationmentioning

confidence: 99%

“…At present most lighting systems use the latter method because of simplicity and cost efficiency. Due to the slow temporal response of the phosphor, the typical modulation bandwidth of LED is limited to about IMHz, which is not enough for future in-door communication [2]. Methods such as blue optical filter or RC equalizer expand bandwidth but can't dynamically compensate mUlti-path effect.…”

Section: Introductionmentioning

confidence: 96%

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Visible light communications using blind equalization

Jin

Zhang

et al. 2011

Optical Transmission Systems, Subsystems, and Technologies IX

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White light-emitting diodes (LED s) are becoming widely used in both illumination and communication applications. In this paper, a visible light communication system is described, which employs blind equalization schemes at the receiver. The blind equalization schemes can both improve the data transmission bandwidth significantly and compensate the signal distortion dynamically. Off-line analysis shows the eye-diagram is observably improved at 10 Mb/s operations using 1 MHz bandwidth white-light LED .

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Section: Blind Decision Feedback Equalizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Visible light communications using blind equalization

Jin

Zhang

et al. 2011

Optical Transmission Systems, Subsystems, and Technologies IX

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“…VLC research to date has primarily been focused on achieving increasingly high data rates [6,7]. The spectrally-efficient OFDM constitutes a hot research topic in the field of VLC [8].…”

Section: Introductionmentioning

confidence: 99%

Adaptation of OFDM under visible light communications and illumination constraints

Little

Elgala

2014

2014 48th Asilomar Conference on Signals, Systems and Computers

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Orthogonal frequency division multiplexing (OFDM) is increasingly studied and adopted as a modulation technique for RF and optical communication systems. In this paper, we investigate challenges to the adoption of OFDM for use in lighting systems that support both intensity control and data communication based on the visible light communication (VLC) technology. In particular, we survey the requirements for energy efficiency, intensity control (dimming) and light-emitting diode (LED) driver integration in lighting systems. These requirements are mapped to contemporary and novel OFDM adaptations to show how both the lighting and communications needs can be met in dual-use scenarios while preserving both missions with reasonable performance.

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“…Such data rates could be accommodated by a fiber-to-the-home (FTTH) access network up to the customer premises but distributing this traffic indoors is quite a challenge. Optical wireless links [5] can be envisioned to carry this data traffic up to the user terminals in a reliable and efficient manner.…”

Section: Introductionmentioning

confidence: 99%

Coherent Optical Wireless Systems for High Speed Local Area Networks with Increased Resilience

Margariti

Kamalakis

2014

Proceedings of the 18th Panhellenic Conference on Informatics

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Optical wireless systems constitute an interesting alternative for supporting next generation local area networks with high speed gigabit-per-second connectivity. Their advantages include a vast license-free spectrum, an abundance of transmission bandwidth, limited health side-effects and zero electromagnetic interference with existing legacy radio networks and other devices. On the other hand, coherent detection is being widely considered in fiber-optic communication systems as a means to provide optical gain at the receiver while at the same time achieving increased spectral efficiency and wavelength selectivity. In this paper we propose to make the best of both worlds combining coherent detection and optical wireless. The improved power budget may ensure better coverage conditions, higher data rates and resilience against shadowing and beam obstruction effects. We discuss the factors that may contribute to the performance degradation in such systems such as laser phase noise, etc. We present some basic calculations and attempt to provide a first indication on the influence of these factors.

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Indoor Gigabit optical wireless communications: Challenges and possibilities

Cited by 53 publications

References 15 publications

Visible light communications using blind equalization

Visible light communications using blind equalization

Adaptation of OFDM under visible light communications and illumination constraints

Coherent Optical Wireless Systems for High Speed Local Area Networks with Increased Resilience

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