Spatial Interference Detection for Mobile Visible Light Communication

Guler, Ali Ugur; Braud, Tristan; Hui, Pan

doi:10.1109/percom.2018.8444591

Cited by 6 publications

(7 citation statements)

References 23 publications

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“…DevLoc by analyzing the effect of overlapping light patterns from different light bulbs whether we are able to separate and identify the different signals. We will adopt the algorithm in [20] which uses orthogonal codes to detect and isolate adjacent light sources, e.g., light markers for object identification.…”

Section: A Properties Of Vlc Physical Channelmentioning

confidence: 99%

DevLoc: Seamless Device Association using Light Bulb Networks for Indoor IoT Environments

Haus

Ott

Ding

2020

2020 IEEE/ACM Fifth International Conference on Internet-of-Things Design and Implementation (IoTDI)

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For indoor IoT environments, spontaneous device associations are of particular interest where users establish a connection in an ad-hoc manner to enable serendipitous interaction. For instance, between a user's personal device and devices the user encounters in the surrounding environment. Our system for device grouping named DevLoc takes advantage of ubiquitous light sources around us to perform continuous device grouping based on the similarity of light signals. To control the spatial granularity of user's proximity, we provide a configuration framework to manage the lighting infrastructure through customized visible light communication. We support two modes of device associations to achieve a binding between different entities: device-to-device and device-to-area allowing either proximity-based or location-based services. Our device grouping includes several methods where in general the machine learning based signal similarity performs best compared to distance and correlation metrics.

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Section: A Properties Of Vlc Physical Channelmentioning

confidence: 99%

DevLoc: Seamless Device Association using Light Bulb Networks for Indoor IoT Environments

Haus

Ott

Ding

2020

2020 IEEE/ACM Fifth International Conference on Internet-of-Things Design and Implementation (IoTDI)

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“…The evaluation includes two test parameters, the sampling interval at the receiver and the Morse time base unit at the sender, both of which affect the throughput and error rate. In detail, at the receiver we use a sampling interval (µs) in the range of [5,10,15,20,25,30 Fig. 7 presents the results for throughput and error rate.…”

Section: A Micro-benchmarks Of Localvlc System Performancementioning

confidence: 99%

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mentioning

confidence: 99%

“…At the sender side, we analyze the Morse time base unit which means the time period of one dot, in other words the smallest time base unit to encode the to be transmitted data. Due to different ignition times of the omnidirectional and directional LEDs, we use a different set of time periods for the Morse time base unit (µs):[5,10,20, 50, 100, 150] for the omnidirectional and [100, 110, 120, 130, 140, 150] for the directional LED. In case of the omnidirectional LED,Fig.…”

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confidence: 99%

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LocalVLC: Augmenting Smart IoT Services with Practical Visible Light Communication

Haus

Ding

Ott

2019

2019 IEEE 20th International Symposium on "A World of Wireless, Mobile and Multimedia Networks" (WoWMoM)

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case for smart homes changing the light color to indicate a successful user authorization.However, in spite of those distinct advantages, many VLC designs focus mainly on the communication performance and novel functionality [3]- [10]. This results in a dilemma for deploying VLC in practice because existing solutions either entail high energy overhead or exhibit unpleasant visual experiences due to the perceptible light flickering effects for end users [11]. The light flickering effect greatly limits the deployment and applicable scenarios of VLC (e.g., to be used as a regular light source for indoor). In light of this challenge, the DarkLight design [11] tackles the problem sphere by emitting extremely-low luminance of light pulses, which makes the lighting device appear as a unnoticeable "dark" bulb. Although DarkLight addressed the flickering issue through an unconventional design, their solution provides a shorter communication range (1.3 m) and cannot replace existing regular light sources compared to our custom light bulb. Specifically, a dedicated DarkLight bulb should be installed besides normal LED lamps where DarkLight services are needed which causes light pollution by overlapping light signals for illumination and communication.This leads to the fundamental question of adopting VLC: how to achieve a practically deployable VLC with low cost and power footprint? Given that common VLC modulation schemes can hardly keep light pulses imperceptible and hence causing light flickering effects [11], we tackle the usability challenge for VLC by proposing a holistic system solution named LocalVLC. In its core, LocalVLC introduces a Morsecode inspired modulation scheme that can operate on off-theshelf LEDs with low energy overhead. We have implemented and evaluated a full-fledged system prototype based on Lo-calVLC design. In practical settings, our LocalVLC prototype can support up to 10 meters of range and attain reasonable throughput (up to 1.4 Kbps) with low error rate and energy consumption. Compared to the widely adopted Manchester encoding, LocalVLC yields 8x improvement on both throughput and energy consumption. Our design can effectively overcome the light flickering effect by encoding data into high frequency light pulses but does not require extra processing hardware such as FPGA or micro-controller. As inspired by but different from DarkLight, LocalVLC can be deployed as standard light source to overcome the light pollution problem by replacing existing lighting. The unique features of VLC can benefit many Abstract-Visible Light Communication (VLC) emerges as a communication technology for Internet of Things (IoT) services with appealing benefits n ot p resent i n e xisting r adio-based communication. However, current VLC designs commonly require dedicated LED lights to emit modulated light beams which entail high energy overhead and unpleasant visual experiences due to the perceptible light blinking effects for end users. This greatly limits the deployment and applicable scenarios of VLC. In this pap...

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“…In particular, the optimal preamble length of the synchronization message is computed by modeling the correct length selection as a multi-arm bandit. In [2] authors consider the issue of overlapping light sources and how is possible to recover the signals. In particular, they propose a physical protocol layer for identifying interference regions and isolate them from the transmission.…”

Section: Introductionmentioning

confidence: 99%

On the Interference Immunity of Visible Light Communication (VLC)

Costanzo

Loscrì

Deniau

et al. 2020

GLOBECOM 2020 - 2020 IEEE Global Communications Conference

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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).

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Spatial Interference Detection for Mobile Visible Light Communication

Cited by 6 publications

References 23 publications

DevLoc: Seamless Device Association using Light Bulb Networks for Indoor IoT Environments

DevLoc: Seamless Device Association using Light Bulb Networks for Indoor IoT Environments

LocalVLC: Augmenting Smart IoT Services with Practical Visible Light Communication

On the Interference Immunity of Visible Light Communication (VLC)

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