Optical-Interference Mitigation in Visible Light Communication for Intelligent Transport Systems Applications

Irfan, Muhammad; Habib, Usman; Muhammad, Fazal; Ali, Farman; Alwadie, Abdullah; Ullah, Shakir; Głowacz, Adam; Głowacz, W.

doi:10.3390/en13195064

Cited by 8 publications

(4 citation statements)

References 40 publications

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“…Another very effective solution is represented by the use of optical filters [33][34][35]. Optical filters allow the passage of the desired wavelengths while attenuating other wavelengths.…”

Section: Enhancing the Optical Noise Resilience And Compatibility Wit...mentioning

confidence: 99%

Driving toward Connectivity: Vehicular Visible Light Communications Receiver with Adaptive Field of View for Enhanced Noise Resilience and Mobility

Căilean,

Avătămăniței,

Beguni

2024

Sensors

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Wireless communication represents the basis for the next generation of vehicle safety systems, whereas visible light communication (VLC) is one of the most suitable technologies for this purpose. In this context, this work introduces a novel VLC receiver architecture that integrates a field-of-view (FoV) adaptation mechanism in accordance with the optical noise generated by the sun. In order to demonstrate the benefits of this concept, a VLC prototype was experimentally tested in an infrastructure-to-vehicle (I2V) VLC configuration, which uses an LED traffic light as the transmitter. At the receiver side, an automatic FoV adaptation mechanism was designed based on a mechanical iris placed in front of a photodetector. Adjustments were made based on the values recorded by a multi-angle light sensor, built with an array of IR photodiodes covering an elevation from 0° to 30° and an azimuth from −30° to 30°. Depending on the incidence of solar light, the mechanical iris can adjust the FoV from ±1° to ±22°, taking into account both the light irradiance and the sun’s position relative to the VLC receiver. For experimental testing, two identical VLC receivers were used: one with an automatic FoV adjustment, and the other with a ±22° fixed FoV. The test results performed at a distance of 50 m, in the presence of solar irradiance reaching up to 67,000 µW/cm2, showed that the receiver with a fixed FoV saturated and lost the communication link most of the time, whereas the receiver with an adjustable FoV maintained an active link throughout the entire period, with a bit error rate (BER) of less than 10−7.

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Section: Enhancing the Optical Noise Resilience And Compatibility Wit...mentioning

confidence: 99%

Driving toward Connectivity: Vehicular Visible Light Communications Receiver with Adaptive Field of View for Enhanced Noise Resilience and Mobility

Căilean,

Avătămăniței,

Beguni

2024

Sensors

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“…For these reasons, it is highly desirable to provide a VLC receiver stage with dedicated filter units to reduce the effects of environmental noise and to recover a sufficient signal-to-noise (SNR) value. A very common approach is to employ a bandpass optical filter mounted in front of a photodiode (PD), allowing only certain wavelengths to be collected by the PD [ 11 , 12 ]. Such a technique is also employed to increase the VLC bandwidth when white LEDs are used [ 13 ], by rejecting the slow yellow-converted spectral component of the LED, typically featuring a few-MHz bandwidths [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, the performance of the receiver is evaluated only through simulations, and there are no implementations in realistic systems. In [ 11 ], the authors proposed and simulated an analytical model for MISO based VLC system, showing that the performance of the system improves significantly in the presence of environmentally induced optical interference, achieving a forward error correction threshold.…”

Section: Introductionmentioning

confidence: 99%

Strong Noise Rejection in VLC Links under Realistic Conditions through a Real-Time SDR Front-End

Umair

Meucci

Catani

2023

Sensors

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One of the main challenges in the deployment of visible light communication (VLC) in realistic application fields, such as intelligent transportation systems (ITSs), is represented by the presence of large background noise levels on top of the optical signal carrying the digital information. A versatile and effective digital filtering technique is, hence, crucial to face such an issue in an effective way. In this paper, we present an extensive experimental evaluation of a complete VLC system, embedding a software-defined-radio (SDR)-based digital signal processing (DSP) filter stage, which is tested either indoors, in the presence of strong artificial 100-Hz stray illumination, and outdoors, under direct sunlight. The system employs low-power automotive LED lamps, and it is tested for baud rates up to 1 Mbaud. We experimentally demonstrate that the use of the DSP technique improves 10× the performance of the VLC receiver over the original system without the filtering stage, reporting a very effective rejection of both 100-Hz and solar noise background. Indoors, the noise margin in the presence of strong 100-Hz noise is increased by up to 40 dB, whilst in the outdoor configuration, the system is capable of maintaining error-free communication in direct sunlight conditions, up to 7.5 m, improving the distance by a factor of 1.6 compared to the case without filtering. We believe that the proposed system is a very effective solution for the suppression of various types of noise effects in a large set of VLC applications.

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“…The distribution of received power and signal-to-noise ratio (SNR) with intersymbol interference (ISI) of directed light is presented [14]. The bit error rate (BER) and outage performance of LOS VLC system is simulated for random orientation of the receiver in [15].…”

Section: Introductionmentioning

confidence: 99%

Performance metrics for vehicular visible light communication systems

et al. 2022

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Vehicular Visible Light communication (VVLC) presents a new paradigm for providing vehicle connectivity, increasing road safety, and achieving autonomous driving. It can be chosen as an alternative solution to radio frequency-based inter-vehicle communication systems and/or as a complementary solution to ensure redundancy. Nevertheless, there are still significant challenges in incorporating visible light communication systems into vehicular networks. The main purpose of this paper is to provide an outline of the performance metrics of a VVLC system. Furthermore, the study is performed based on a vehicle-to-vehicle dynamic model close to reality, considering the effect of geometrical changes in the LOS path and the variation of the inter-vehicular distance. The analysis of the proposed system is discussed in terms of Signal to noise (SNR), Field of view (FOV), mobility, and average capacity.

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Optical-Interference Mitigation in Visible Light Communication for Intelligent Transport Systems Applications

Cited by 8 publications

References 40 publications

Driving toward Connectivity: Vehicular Visible Light Communications Receiver with Adaptive Field of View for Enhanced Noise Resilience and Mobility

Driving toward Connectivity: Vehicular Visible Light Communications Receiver with Adaptive Field of View for Enhanced Noise Resilience and Mobility

Strong Noise Rejection in VLC Links under Realistic Conditions through a Real-Time SDR Front-End

Performance metrics for vehicular visible light communication systems

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