Govindwad, Shraddha Vijay and Kumar, Abhinav
(2019)
Developing and demonstrating Visible Light Communication system for Smart Transportation.
Masters thesis, Indian institute of technology Hyderabad.
Abstract
Smart Transportation System (STS) is a basic requirement of smart cities. In STS for vehicle to vehicle and vehicle to infrastructure communication a dynamic communication system is required with fast locking and ability to handle continuously changing channel conditions. Due to localised nature and unlicensed frequency band Visible Light Communication (VLC) can be a good alternative for STS. In this thesis we performed hardware experiments on VLC link for distance of 16m and got zero bit error rate and distance of 23m with BER less than 0.02. We have experimented for data rate of 2KHz. We have experimentally calculated the rise time and fall time of LED driver and receiver photo diode. The bottolneck in increasing data rate in outdoor VLC is LED driver. We proposed an algorithm for fast locking of devices with automated threshold decision. It is suitable for continuously changing channel conditions and rapid handoffs occurring in vehicular environment. The proposed algorithm is compatible with IEEE standard for VLC.
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