Time variation in vehicle-to-vehicle visible light communication channels

Chen, Ailing; Wu, Hao-Ping; Wei, Yu-Lin; Tsai, Hsin-Mu

doi:10.1109/vnc.2016.7835926

Cited by 31 publications

(26 citation statements)

References 7 publications

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“…The subcarriers are modulated at frequencies from 200 kHz to 400 kHz using binary PSK (BPSK) and generated with a digital-to-analog converter (DAC) at a sampling rate of 200 kHz. As the median of 90% coherence time of the V2V-VLC channel on the freeway is about 0.2 s [12], the packet duration is set to be 0.2 s, corresponding to 40 symbols carrying 400 bits per packet. In addition, each OFDM symbol is repeated 50 times which, as shown in [9], enhances the decoding power, and thus, the range of operation.…”

Section: A Multiple Carrier Modulation Ofdmmentioning

confidence: 99%

Comparison of OFDM and OOK modulations for vehicle-to-vehicle visible light communication in real-world driving scenarios

2019

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Visible light communication (VLC) is seen as an interesting technology to complement the IEEE 802.11p-based systems commonly used for vehicle-to-vehicle (V2V) communication. However, the reliability of such a V2V-VLC link in real-world driving scenario had not been demonstrated up to very recently. The results obtained, at that time with orthogonal frequency division multiplexing (OFDM) at 2 kbps, are complemented in this paper with additional results using on-off keying (OOK) at 100 kbps. The overall performances of this second modulation are rather close to those of OFDM. The packet reception rate (PRR) remains more than 90% over a service area of 30 m lengthwise and the link is not affected by multipath propagation. Error-free transmission is even demonstrated over 60 m using repetition coding, at the cost of a reduced data rate of 10 kbps. However, it is shown that OFDM is able to cope with the narrow-band interferences generated by outdoor lighting such as LED signs whereas the OOK link is completely jammed. Despite its simplicity and good overall performances, OOK is thus not as robust as OFDM to the variety of situations experienced in real-world driving scenario.

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Section: A Multiple Carrier Modulation Ofdmmentioning

confidence: 99%

Comparison of OFDM and OOK modulations for vehicle-to-vehicle visible light communication in real-world driving scenarios

2019

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“…As modern vehicles are tending to use LED headlights (Jong-Ho et al 2013;Uysal 2015) and LED taillights, this provides a range of automotive VLC-V2V opportunities (Kim et al 2014;Siddiqi et al 2016). As the transmission channel has time-variant properties and greatly depends on weather and visibility conditions Chen et al (2016), there are many studies available where the VLC-V2V channel is modeled (Uysal 2015;Alsalami et al 2019;Eldeeb et al 2019;Karbalayghareh et al 2020;Lee et al 2012). There are also studies on the specific impact of some dedicated weather conditions (e.g.…”

Section: Introductionmentioning

confidence: 99%

Common-mode noise filtering with space-divided differential 2x2 VLC for V2V applications

2021

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Vehicle-to-Vehicle (V2V) Communication is one of the most promising application opportunities of Visible Light Communication (VLC). This paper suggests a novel transmission technique for VLC-V2V applications, called 2x2 Differential Transmission (2x2 DT). This transmission method exhibits excellent common-mode optical noise rejection performance. This beneficiary property is presented first with simulation results and later with real-life urban traffic measurement as well. After the promising simulation results, a demonstrational automotive-grade VLC-V2V link is presented and investigated for evaluation purposes. The link does not contain electrical filters, optical filters nor optical lenses, hence link costs are kept low and versatility is preserved. With our proposed 2x2 differential solution, both the transmission quality and common-mode optical noise rejection performance is outstanding. Due to the increased sensitivity of the differential VLC transmission regarding crosstalk between channels, a method is suggested for crosstalk reduction for high-quality differential transmission.

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“…First, thanks to the inherent line-of-sight optical propagation property, there is limited interference even in a dense communication network [38]. Second, VLC exhibits a very slowly varying channel in outdoor and mobile environments, and hence offers better reliability than the RF-based communication in these scenarios [12].…”

Section: Introductionmentioning

confidence: 99%

RayTrack

Shen

Tsai

2021

Proceedings of the 19th Annual International Conference on Mobile Systems, Applications, and Services

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Connected autonomous vehicles have boosted a high demand on communication throughput in order to timely share the information collected by in-car sensors (e.g., LiDAR). While visible light communication (VLC) has shown its capability to offer Gigabit-level throughput for applications with high demand for data rate, most are performed indoors and the throughput of outdoor VLC drops to a few Mbps. To fill this performance gap, this paper presents RayTrack, an interference-free outdoor mobile VLC system. The key idea of RayTrack is to use a small but real-time adjustable FOV according to the transmitter location, which can effectively repel interference from the environment and from other transmitters and boost the system throughput. The idea also realizes virtual point-to-point links, and eliminates the need of link access control. To be able to minimize the transmitter detection time to only 20 ms, RayTrack leverages a high-compression-ratio compressive sensing scheme, incorporating a dual-photodiode architecture, optimized measurement matrix and Gaussian-based basis to increase sparsity. Real-world driving experiments show that RayTrack is able to achieve a data rate of 607.9 kbps with over 90% detection accuracy and lower than 15% bit error rate at 35 m, with 70 -100 km/hr driving speed. To the best of our knowledge, this is the first working outdoor VLC system which can offer such range, throughput and error performance while accommodating freeway mobility. CCS CONCEPTS• Networks → Mobile networks; • Hardware → Signal processing systems.

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Time variation in vehicle-to-vehicle visible light communication channels

Cited by 31 publications

References 7 publications

Comparison of OFDM and OOK modulations for vehicle-to-vehicle visible light communication in real-world driving scenarios

Comparison of OFDM and OOK modulations for vehicle-to-vehicle visible light communication in real-world driving scenarios

Common-mode noise filtering with space-divided differential 2x2 VLC for V2V applications

RayTrack

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