Design of the communication network to be used in smart transportation systems

In this thesis, an intelligent data transmission system based on different wireless technologies is introduced to provide traffic safety control and warning assistance systems for ITS applications. The developed system has been designed to transmit image (jpeg, bmp), audio (mp3), office, pdf files and text messages in vehicular networks. Additionally, the developed system is featuring automatic detection and positioning traffic accidents by the help of GPS and accelerometer.The system proposes facilities that can shorten time to reach medical help. In order to investigate effects of different environments, antennas and vehicle speed on V2V and V2I communications, a set of experiments were performed with omni directional and directional antennas in different environments. Results show that IEEE 802.11b/g standards can be used for transmitting multimedia files in vehicular networks. Results also show that distance, line of sight communication and environmental conditions are the main factors affecting the vehicular network connectivity.