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Channel modelling of VVLC system

Intelligent Transportation Systems (ITSs) provide safety, security of the passenger by cooperation and coordination between vehicles and roadside infrastructures. RF based Dedicated Short-Range Communication (DSRC) is used for this purpose which is designed based on IEEE 802.11p standard. Due to the limited frequency range of IEEE 802.11p, it faces significant interference problem and packet delay, specially when a large number of vehicles concentrate in the same vicinity. These problems can be unravelled by new visible light-based wireless communication technology named VLC (Visible Light Communication), as it has a line of sight property and high data transmission capability. To make the communication realistic, we need an effective channel modelling to predict the channel condition. In literature, few channel modelling of the vehicle visible light communication (VVLC) have been proposed based on the radiation pattern of vehicle headlight and some authors have considered surface reflection as a channel modelling parameter. Here, we have proposed a new channel modelling for VVLC where we have considered the relative distance between the vehicles as a function of the channel modelling. To model this, we considered that the headlight of the vehicles follows Lambertian radiation pattern, which transmits data by means of changing the brightness of light. To check the performance of our proposed model, we have derived the expression of average bit error rate (BER) and average signal to noise ratio (SNR) using our proposed model. From the result section, we can observe the significant change of average BER and average SNR in accordance with the variation of the longitudinal distance between transmitter and receiver and half-angle of transmitted LED.