Scooter-to-X Radio Frequency and Visible Light Communication
Date Issued
2015
Date
2015
Author(s)
Lin, Hao-Min
Abstract
Investigation of statistics in recent years suggests that in Taiwan scooters contribute to most injuries and deaths in traffic accidents. As their lower sale price, advance safety features that have become standard features in cars cannot be incorporated in them because of the smaller cost margin. Instead of utilizing costly sensors to detect nearby moving objects, one possible solution is to utilize communications between vehicles, including cars and scooters, with which they periodically report their own locations. Neighboring vehicles can then be aware of them and the probability of a collision can be decreased. In this study, 2.4 GHz link measurements were carried out to study the behaviors of the communication links when one or both ends of the link is a scooter. Specifically, the study identifies the best location of the antenna on a scooter and quantifies the attenuation caused by the driver and the passenger of the scooter in different scenarios. A simple model is proposed to determine the attenuation caused by the human body of the driver and the passenger based on relative locations of the transmitting and receiving vehicles. Besides, a new Rolling Shutter Frequency-shift Keying (RS-FSK) modulation for Camera-based Visible Light Communication (CamCom) scheme is proposed to enable the communication ability of the LED light on the vehicle. Enabling this ability helps not only connecting to the neighboring vehicles but also provide visual association to the Scooter-to-X network. Furthermore, the advantage of RS-FSK demodulation scheme is, this scheme can be easily implemented as a smartphone app with its built-in camera. Thus reduced the startup cost of receiver side and boost the initial phase because the penetration rate of smart phone is more than 51% and raising up in Taiwan. Finally, we built a CamCom prototype system which utilized the RS-FSK modulation on the real vehicle then carried a series of link measurements in the both stationary and driving scenarios. The experimental results show that it achieves raw throughput with 180 and 80-140 bits per second in 10 m fixed scenario and 5-12 m real world field experiments, respectively.
Subjects
Vehicular Network
Motorcycle
Shadowing
Visible Light Communications
Camera Communications
Rolling Shutter
Frequency Shift Keying
SDGs
Type
thesis
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