Modeling And Simulation Research On Vehicle Ad-hoc Network Channel

With the rapid development of society, and the increasing of various vehicles, the problems of road safety have been paid more attention. Vehicle Ad-hoc network based on the communications between vehicles, can make the drivers accurately and timely get driving information of other vehicles, and reduce the traffic accidents.This paper studies the channel characteristic of vehicle Ad-hoc network. According to the characteristics and the basic laws of VANET, and combined with the characteristics of wireless mobile channels, a VANET channel model is established in this paper. We also simulate the performance of the model. All of these provide a theoretical basis to VANET.In this paper, first, we introduce VANET channel briefly. We point out the strengths and weaknesses of communication conditions in VANET, and the analysis of the propagation characteristics of wireless mobile communications. In the process of signal propagation, it experienced path loss and small scale fading. Next, the simulation of path loss model and small scale fading is carried out. Finally, the channel model of VANET is proposed. In this paper, the signal vehicles received is considered as a processed result from the transmitter. It propagates in two kinds of path, visible path and none visible path. No matter in which kind of path, the signal will experience path loss and it is added with Gaussian white noise. The visible path experiences path loss only. But because of the blocking of obstacles and the relative motions between the vehicle, the none visible path also experiences propagation delay and Raleigh fading. In the studies, the research of the Raleigh fading model in the none visible path uses sine summation theorem. We introduce how to pull in path loss and Gaussian white noise, and MATLAB software is used into simulating the channel model.