A Noise Mitigation Approach for VLC Systems (original) (raw)
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On the Interference Immunity of Visible Light Communication (VLC)
GLOBECOM 2020 - 2020 IEEE Global Communications Conference, 2020
Visible Light Communication (VLC) relies on the dual use of existing light infrastructure for wirelessly send data. VLC is regarded as a "green", cost-effective and secure communication technology. Moreover, VLC has been always considered immune to Radio Frequency (RF) waves. The only type of interference that has always been included in the channel model is the optical interference. Nevertheless, all the interference components potentially impacting on the performance of the system should be integrated in the transmitting model in order to improve the performance of the communication system. In this paper, we investigate on the interference and immunity of the VLC systems in respect of frequencies spanning the spectrum up to 1 GHz. We provide a detailed evaluation of the immunity of a VLC system by the means of experiments realized in "controlled" environment, i.e. an anechoic chamber, by considering interference at different power levels. Results are very interesting, since at specific frequency values, the VL transmitted signal results too "interfered" and noisy to be correctly recovered. In order to evaluate the impact of this interference, we have estimated the Bit Error Rate (BER) for different index modulations of Pulse-Position Modulation (mPPM).
Visible Light Communication-An Emerging Wireless Communication Technology
The Visible Light Communication (VLC) is an emerging technology, which provides distinct facilities such as fast data communication, secure data communication, high data rate wireless communication, etc. Instead of radio frequency, VLC uses light, to transfer data. The visible light spectrum is unlicensed and 10,000 times larger than the range of radio frequencies. It can be used as an alternate to the existing radio based wireless communication technologies or in hybrid. Moreover, Integrated VLC resolves issue of load balancing in existing wireless networks. Light Fidelity is a recent technology under VLC, which can be used for wireless communication as it has many advantages such as no electromagnetic interference, low cost and high data rate. This paper emphasizes on the Visible Light Communication technologies and their applications. Moreover, their advantages and limitations are also covered.
Visible Light Communication: A System Perspective—Overview and Challenges
Sensors
Visible light communication (VLC) is a new paradigm that could revolutionise the future of wireless communication. In VLC, information is transmitted through modulating the visible light spectrum (400–700 nm) that is used for illumination. Analytical and experimental work has shown the potential of VLC to provide high-speed data communication with the added advantage of improved energy efficiency and communication security/privacy. VLC is still in the early phase of research. There are fewer review articles published on this topic mostly addressing the physical layer research. Unlike other reviews, this article gives a system prespective of VLC along with the survey on existing literature and potential challenges toward the implementation and integration of VLC.
2018 11th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP)
Indoor visible light communication (VLC) has seen major growth in the last decade, reaching data rates in the Gbps range over 10 m distance. Its main limiting factors however are the low speed of the optoelectronic devices as well as the ambient noise reducing the system performance and reliability. The interference due to the artificial white light sources used for illumination in an indoor environment is one of the major noise sources challenging the performance of the VLC indoor channel. Since these noise sources operate at different frequencies, filtering their DC effect out does not eliminate their effect. This paper practically measures the noise power of the contemporary artificial light sources in an indoor visible light link to characterize their effect. The measurements show that thermal light sources cause a high noise power in a limited bandwidth of a few hundreds of Hz, while gas discharge lamps and dimmed semiconductor light sources have a much wider significant noise spectrum. An interference model to determine the overall noise power due to said sources is then deduced.
Simulation, performance and interference analysis of multi-user visible light communication systems
2017
SIMULATION, PERFORMANCE AND INTERFERENCE ANALYSIS OF MULTI-USER VISIBLE LIGHT COMMUNICATION SYSTEMS by Adel Aldalbahi The emergence of new physical media such as optical wireless, and the ability to aggregate these new media with legacy networks motivate the study of heterogeneous network performance, especially with respect to the design of protocols to best exploit the characteristics of each medium. This study considers Visible Light Communications (VLC), which is expected to coexist with legacy and future radio frequency (RF) media. While most of the research on VLC has been done on optimizing the physical medium, research on higher network layers is only beginning to gain attention, requiring new analyses and tools for performance analysis. The first part of the dissertation concerns with developing a new ns3-based VLC module that can be used to study VLC-RF heterogeneous networks via simulation. The proposed ns3 module is developed based on existing models for intensity modula...
The aim of this paper is to determine the viability of Indoor Optical Wireless Communication System. This paper introduces Visible Light Communication along with its merits, demerits and applications. Then the main characteristics of VLC system are described, around which the project is designed. Multiple Input-Multiple Output (MIMO) technique is used in the project in order to enhance the data rate of transmission. Instead of using a system of only one LED and one APD, which transmits only one bit at a time, a system of 4 LEDs and 4 APDs is introduced, which increases the data rates by 300% from the previous case. We observe the signal, noise, SNR, BER etc. across the room dimension. Finally, in the last chapter we summarize our results on the basis of MATLAB simulations and propose some modifications to this model that can be implemented in future.
Illumination interference reduction system for VLC communications
… and Computers in …, 2009
Abstract-In this work, an illumination interference reduction technique for visible light communications (VLC) is presented. In this kind of systems an optical wireless communication is established using visible light wavelength, therefore optical filtering for interference rejection can not be employed. Instead of the optical filtering a signal processing based solution is proposed. It consists of the equalization of the received signal by a transmission channel inverse filter in order to reduce the effects of the channel in the ...
Study and Validation of Eavesdropping Scenarios over a Visible Light Communication Channel
Sensors (Basel, Switzerland), 2017
The security and privacy provided by Visible Light Communication (VLC) technologies is an area that has been slightly addressed due to the misconception that, since light does not go through solid objects like walls, VLC-based communications cannot be eavesdropped on by outside observers. As an upcoming technology, VLC is expected to be used in multiple environments were, due to radio frequency RF overuse or limitations, RF solutions cannot or should not be employed. In this work, we study the eavesdropping characteristics of a VLC-based communication. To evaluate these concerns, a two-step process was followed. First, several simulations of a standardly used scenario were run. Later on, experimental tests were performed. Following those tests, the results of the simulations and the experimental tests were analyzed. The results of these simulations and tests seemed to indicate that VLC channels can be eavesdropped on without considerable difficulties. Furthermore, the results showed...
Applications, limitations, and improvements in visible light communication systems
2015 International Conference on Connected Vehicles and Expo (ICCVE), 2015
Wireless communication networks using unlicensed frequency band faces certain challenges like unrestrained interfering and bad quality of transmission. To surmount the scarcity of frequency band, a new technique for wireless communication is compulsory to adapt the exponentially rising wireless communication demand. Visible light communication systems (VLCN) offer a replacement to the existing standards of wireless communication, through light from light-emitting diodes (LEDs) as the mean of communication. As LEDs twinkle repeatedly at a high speed such that human eye cannot perceive changes in light intensity, but a perceptive photodiode detect the on-off attitude and can interpret the data implanted within the light. This paper investigates different issues in the existing wireless communication networks, and studies how VLCN can resolve these issues, and proposes design of the VLCN. Moreover, applications, solution to current issues and future improvements are discussed in this paper.
Visible Light Communication Systems Conception and VIDAS
Iete Technical Review, 2008
Visible Light Communication (VLC) using LEDs is emerging as a key technology for a ubiquitous communication system, because LED has the advantages of fast switching, long life expectancy, being less expensive and being visible light that is safe for the human body. The VLC system is expected to undergo rapid progress, inspiring numerous indoor and outdoor applications; however, many technical issues need to be addressed, especially in outdoor environment. In order to provide a better understanding of the research challenges of VLC, this article presents a detailed investigation of the current state-of-art concept. Open research issues such as channel modelling and modulation techniques are also discussed, with the objective of triggering new research interest in this field. The paper also introduces our ongoing development of Wireless USB Interface and the project VIDAS.