Interference Mitigation Through User Association and Receiver Field of View Optimization in a Multi-User Indoor Hybrid RF/VLC Illuminance-Constrained Network

Abdalla, Iman; Rahaim, Michael; Little, Thomas D. C.

doi:10.1109/access.2020.3045929

Cited by 10 publications

(5 citation statements)

References 33 publications

(33 reference statements)

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“…From this perspective, the current version of the prototype did not address the issues associated with multiple lighting devices. Nevertheless, the indoor VLC literature has widely addressed these issues and it was able to find the proper solutions that allow user mobility, provide the hand-over mechanisms between multiple light sources, and enable multiple-users resource sharing [45][46][47]. Consequently, it can be considered that user movement and the synchronization between multiple lighting devices are not that problematic.…”

Section: Discussion and Future Perspectives Regarding The Use Of The ...mentioning

confidence: 99%

Visible Light Communications-Based Assistance System for the Blind and Visually Impaired: Design, Implementation, and Intensive Experimental Evaluation in a Real-Life Situation

Căilean,

Avătămăniței,

Beguni

et al. 2023

Sensors

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Severe visual impairment and blindness significantly affect a person’s quality of life, leading sometimes to social anxiety. Nevertheless, instead of concentrating on a person’s inability, we could focus on their capacities and on their other senses, which in many cases are more developed. On the other hand, the technical evolution that we are witnessing is able to provide practical means that can reduce the effects that blindness and severe visual impairment have on a person’s life. In this context, this article proposes a novel wearable solution that has the potential to significantly improve blind person’s quality of life by providing personal assistance with the help of Visible Light Communications (VLC) technology. To prevent the wearable device from drawing attention and to not further emphasize the user’s deficiency, the prototype has been integrated into a smart backpack that has multiple functions, from localization to obstacle detection. To demonstrate the viability of the concept, the prototype has been evaluated in a complex scenario where it is used to receive the location of a certain object and to safely travel towards it. The experimental results have: i. confirmed the prototype’s ability to receive data at a Bit-Error Rate (BER) lower than 10−7; ii. established the prototype’s ability to provide support for a 3 m radius around a standard 65 × 65 cm luminaire; iii. demonstrated the concept’s compatibility with light dimming in the 1–99% interval while maintaining the low BER; and, most importantly, iv. proved that the use of the concept can enable a person to obtain information and guidance, enabling safer and faster way of traveling to a certain unknown location. As far as we know, this work is the first one to report the implementation and the experimental evaluation of such a concept.

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Section: Discussion and Future Perspectives Regarding The Use Of The ...mentioning

confidence: 99%

Visible Light Communications-Based Assistance System for the Blind and Visually Impaired: Design, Implementation, and Intensive Experimental Evaluation in a Real-Life Situation

Căilean,

Avătămăniței,

Beguni

et al. 2023

Sensors

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“…The left image represents the tradeoffs in directionality and coverage of various wireless technologies. Generally, the high resolution of directional communications offers the potential for massive gains in area spectral efficiency; however, the reduced instantaneous coverage also implies unique challenges when considering network provisioning for multiple dynamic users [21][22][23]. The right image of Figure 2 depicts the potential alignment of technologies with wireless devices that have various data demand and mobility characteristics.…”

Section: Background and Motivationmentioning

confidence: 99%

Multi-Tier Heterogeneous Beam Management for Future Indoor FSO Networks

2021

Self Cite

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To meet the growing demand for wireless capacity, communications in the Terahertz (THz) and optical bands are being broadly explored. Communications within these bands provide massive bandwidth potential along with highly directional beam steering capabilities. While the available bandwidth offers incredible link capacity, the directionality of these technologies offers an even more significant potential for spatial capacity or area spectral efficiency. However, this directionality also implies a challenge related to the network’s ability to quickly establish a connection. In this paper, we introduce a multi-tier heterogeneous (MTH) beamform management strategy that utilizes various wireless technologies in order to quickly acquire a highly directional indoor free space optical communication (FSO) link. The multi-tier design offers the high resolution of indoor FSO while the millimeter-wave (mmWave) system narrows the FSO search space. By narrowing the search space, the system relaxes the requirements of the FSO network in order to assure a practical search time. This paper introduces the necessary components of the proposed beam management strategy and provides a foundational analysis framework to demonstrate the relative impact of coverage, resolution, and steering velocity across tiers. Furthermore, an optimization analysis is used to define the top tier resolution that minimizes worst-case search time as a function of lower tier resolution and top tier range.

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“…In fact, this brings the advantage of high spatial density in VLC systems compared to radio frequency communication systems. One of the key factors affecting multi-cell VLC systems' performance is the receiver's field of view (FOV) [9]. FOV refers to the angle of visibility between the transmitter and receiver from the receiver's point of view.…”

Section: Introductionmentioning

confidence: 99%

“…The optimization of the receiver's field of view has also been proposed [11]. Using simulation results, it has been shown that communication performance can be improved significantly using a dynamic field-of-view receiver [9,19,20]. For hardware-level implementation, a mechanical iris has been used to dynamically change the receiver's field of view to improve communication performance in dense multi-cell VLC networks [21].…”

Section: Introductionmentioning

confidence: 99%

Interference Mitigation in VLC Systems using a Variable Focus Liquid Lens

Bera,

Karmakar

2024

Photonics

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The field of view (FOV) is an important parameter of a visible light communication (VLC) receiver. A variable FOV can be useful to mitigate interference from neighboring cells in a multi-cell VLC network. The existing works on dynamic FOV VLC receivers have used a mechanical iris to control the receiver’s FOV, making the VLC receiver bulky, slow, and power-consuming. In this article, an electronically controlled variable focus liquid lens is used to vary the FOV of the receiver dynamically. A low-cost microcontroller-based feedback control system controls the effective FOV of the receiver to reject signals from unwanted transmitters, thus maximizing the signal-to-interference plus noise ratio (SINR) of the received signal. Experimental results show that the proposed technique effectively improves SINR performance in a multi-cell VLC network. To the best of the authors’ knowledge, this is the first reported work to utilize an electronically controlled compact liquid lens for designing a dynamic FOV VLC receiver.

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Interference Mitigation Through User Association and Receiver Field of View Optimization in a Multi-User Indoor Hybrid RF/VLC Illuminance-Constrained Network

Cited by 10 publications

References 33 publications

Visible Light Communications-Based Assistance System for the Blind and Visually Impaired: Design, Implementation, and Intensive Experimental Evaluation in a Real-Life Situation

Visible Light Communications-Based Assistance System for the Blind and Visually Impaired: Design, Implementation, and Intensive Experimental Evaluation in a Real-Life Situation

Multi-Tier Heterogeneous Beam Management for Future Indoor FSO Networks

Interference Mitigation in VLC Systems using a Variable Focus Liquid Lens

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