Miller code usage in Visible Light Communications under the PHY I layer of the IEEE 802.15.7 standard

Cagneau²,

Chassagne³

et al. 2015

IEEE Sensors J.

Self Cite

International audience— This paper presents an easy-to-use sensor aimed for traffic safety applications using visible light communications. A central problem in this area is the design of a suitable sensor able to enhance the conditioning of the signal and to avoid disturbances due to the environmental conditions. The visible light communication sensor proposed in this article addresses these issues and enables a robust communication for short to medium distances. The presentation is focused on hardware aspects and low-level coding techniques. The experimental validation of the proposed sensor has been conducted by analyzing communication performances between a commercial traffic light and the sensor, for distances up to 50 m. The measurements exhibit bit error ratio lower than 10-7 in an outdoor configuration, using two well-known codes (Manchester and Miller) without any error-correcting codes or complex signal processing. The prototype is aimed for automotive applications but other outdoor configurations can also be addressed by slight changes in the system design. Index Terms— infrastructure to vehicle communication, robust sensor, smart lighting systems, vehicle safety applications, visible light communications

Section: B Discussion About the Codingmentioning

confidence: 99%

Section: B Discussion About the Codingmentioning

confidence: 99%

Novel Receiver Sensor for Visible Light Communications in Automotive Applications

Cagneau²,

Chassagne³

et al. 2015

IEEE Sensors J.

Self Cite

“…The microcontroller processes the data to send, transforms it into a binary string, encodes the data, creates the data frame and modulates it. In this case, the VLC prototype is able to work with Direct Sequence Spread Spectrum (DSSS) and On-Off-Keying (OOK) modulations, Sequence Inverse Keying (SIK) [ 21 ], Manchester and Miller [ 65 ] coding techniques and variable data rates between 3 and 200 kb/s. The data frame begins with a synchronization header that informs the VLC receiver that a new data frame will begin, continues with a physical header that provides the VLC receiver with information concerning the selected modulation, coding technique, data rate, and message length, and ends-up with a variable length data field.…”

Section: Description Of the Vehicle-to-vehicle Visible Light Communications Prototypementioning

confidence: 99%

Evaluation of Misalignment Effect in Vehicle-to-Vehicle Visible Light Communications: Experimental Demonstration of a 75 Meters Link

Avatamanitei

Beguni

et al. 2021

Sensors

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The use of visible light communications technology in communication-based vehicle applications is gaining more and more interest as the research community is constantly overcoming challenge after challenge. In this context, this article addresses the issues associated with the use of Visible Light Communications (VLC) technology in Vehicle-to-Vehicle (V2V) communications, while focusing on two crucial issues. On the one hand, it aims to investigate the achievable communication distance in V2V applications while addressing the least favorable case, namely the one when a standard vehicle rear lighting system is used as a VLC emitter. On the other hand, this article investigates another highly unfavorable use case scenario, i.e., the case when two vehicles are located on adjacent lanes, rather than on the same lane. In order to evaluate the compatibility of the VLC technology with the usage in inter-vehicle communication, a VLC prototype is intensively evaluated in outdoor conditions. The experimental results show a record V2V VLC distance of 75 m, while providing a Bit Error Ratio (BER) of 10−7–10−6. The results also show that the VLC technology is able to provide V2V connectivity even in a situation where the vehicles are located on adjacent lanes, without a major impact on the link performances. Nevertheless, this situation generates an initial no-coverage zone, which is determined by the VLC receiver reception angle, whereas in some cases, vehicle misalignment can generate a BER increase that can go up to two orders of magnitude.

“…On the down-side, the Manchester code has the disadvantage of larger bandwidth requirements as compared to other common codes. Accordingly, in addition to the classical Manchester code, the performances of the Miller code [70,71] are also investigated. The Miller code has rather similar advantages as the Manchester code, but it is also bandwidth-efficient.…”

Section: Modulation and Coding Techniquesmentioning

confidence: 99%

Design and Intensive Experimental Evaluation of an Enhanced Visible Light Communication System for Automotive Applications

Avatamanitei

Done

et al. 2020

Sensors

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As the interest toward communication-based vehicle safety applications is increasing, the development of secure wireless communication techniques has become an important research area. In this context, the article addresses issues that are related to the use of the visible light communication (VLC) technology in vehicular applications. Thus, it provides an extensive presentation concerning the main challenges and issues that are associated to vehicular VLC applications and of some of the existing VLC solutions. Moreover, the article presents the aspects related to the design and intensive experimental evaluation of a new automotive VLC system. The experimental evaluation performed in indoor and outdoor conditions shows that the proposed system can achieve communication distances up to 50 m and bit error ratio (BER) lower than 10−6, while being exposed to optical and weather perturbations. This article provides important evidence concerning the snowfall effect on middle to long range outdoor VLC, as the proposed VLC system was also evaluated in snowfall conditions. Accordingly, the experimental evaluation showed that snowfall and heavy gust could increase bit error rate by up to 10,000 times. Even so, this article provides encouraging evidence that VLC systems will soon be able to reliably support V2X communications.