Characterisation and modelling of artificial light interference in optical wireless communication systems

Abstract-Our previous studies focused on channel simulation and performance evaluation of optical wireless links for medical body sensor networks. This allowed us to increase our expertise in this field and to propose here a full optical wireless bidirectional system named as LiFi communication system for medical monitoring applications. The full duplex bidirectional communication is based on an infrared uplink and visible downlink. The studied scenario considers a patient wearing both an infrared transmitter connected to a medical sensor and a visible light receiver. The infrared receivers and visible light emitters are included in light fixtures at the ceiling. The study relies on channel modelling considering patient body features, locations and movements. Using ray-tracing technique associated to MonteCarlo method, we determine the overall performance in terms of outage probability. We apply our methodology considering various medical sensors and show that it is possible to satisfy the overall quality of service in terms of bit error rate and data rate.

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“…We will consider in this study typical values of around 5100µA for VLC and 200µA for near-infrared wavelengths [18].…”

Section: A Outage Probability Definitionsmentioning

confidence: 99%

Infrared and visible links for medical body sensor networks

Lebas

Sahuguède

Julien-Vergonjanne

et al. 2018

2018 Global LIFI Congress (GLC)

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“…A similar solution was described in Ref. 6, using an equation of optical filter. Here, we used the same idea with the polarizer equations described in Ref.…”

Section: Using a Differential Detector With A Single Polarizermentioning

confidence: 99%

Indoor wireless optical communication systems: effect of ambient noise

et al. 2014

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Abstract. Many techniques using polarizers, differential detectors, and electrical filters are used to overcome the penalty induced by artificial light interference and are analyzed. These techniques are used to reduce noise current or remove it by using an electrical filter or a polarizer or both of them together. We are going to display the effect of noise voltage, flicker voltage of a tungsten lamp, and signal-to-noise ratio (SNR) of the systems by changing each parameter to reach the best solution for reducing the effect of noise on free space optics. This paper will show that the best SNR is obtained with the differential detector with a two orthogonal polarizer system and that the worst one is with the system of a single photodetector.

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“…The average power of this background radiation generates a DC photocurrent in the photodetector, giving rise to shot noise, which is the dominant noise source in a typical diffuse receiver. In addition to contributing to the generation of shot noise, fluorescent lamps also introduce a periodic interference signal in the receiver, which can contain harmonics up to ~50 kHz for lamps driven by the mains frequency [4], and up to ~1 MHz when driven by high frequency electronic ballasts [4,5]. When there is an overlap between the detected electrical spectrum of the fluorescent light interference and the baseband spectrum of the modulated data, the performance of an infrared wireless system will be degraded if nothing is done to combat the interference.…”

Section: Introductionmentioning

confidence: 99%

Baseline-wander effects on systems employing digital pulse-interval modulation

Hayes

Ghassemlooy

Seed

et al. 2000

IEE Proceedings - Optoelectronics

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Fluorescent lamps introduce a periodic interference signal in optical wireless receivers, which has the potential to severely degrade link performance. Usually, electrical high-pass filtering is employed to mitigate the effects of this interference, but this results in baseline wander or intersymbol interference. Digital pulse interval modulation (DPIM) is a modulation technique which has been shown to be suitable for deployment in optical wireless communication systems and this paper examines the effect of baseline wander on systems employing DPIM. A new expression is given for the slot autocorrelation function of DPIM and, from this, the power spectral density is calculated. The error performance of DPIM, as a function of high-pass filter (HPF) cut-on frequency, is compared with the more established techniques of on-off keying using non-return to zero signalling (OOK) and pulse position modulation (PPM), using both numerical analysis and computer simulation.

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Characterisation and modelling of artificial light interference in optical wireless communication systems

Cited by 55 publications

References 5 publications

Infrared and visible links for medical body sensor networks

Infrared and visible links for medical body sensor networks

Indoor wireless optical communication systems: effect of ambient noise

Baseline-wander effects on systems employing digital pulse-interval modulation

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