A Novel Multiplexing Method for High Data Rate Communication Systems

In order to improve exploitation in guided transport networks, many approaches have been investigated for the development of tools or systems able to provide needed information. Ours laboratories designed an original radar system that allows inter-vehicle communication. This system called CODIREP - communication detection and identification of broken-down trains - is based on the principle of a co-operative radar using a transponder inside targets. It is made of a transmitter/receiver couple, which equips respectively the front and the rear of two successive vehicles. It uses a numerical correlation receiver and has a broad band of about 100MHz which could be exploited to establish high data flow communications. A preliminary prototype was realized using a technical solution to multiplex communication data and localization code. The tests in free space and tunnel show that a range of 800 m in free space and 700 m in tunnel with a location precision of 1.5 m and a data rate of about 1.6 Mbps could be reached. This remains insufficient for some applications that require more resources. With the system, we intend to reach more than 5 Mbps. The aim of this work is to improve this system by proposing another original coding technique developed in order to increase the data flow rate. Simulations will be executed to evaluate the system's performances in terms of data flow, bit error rate (BER), computing time and complexity.