Modulation and Coding Techniques for Inter-Vehicular Communications

Abstract

Direct inter-vehicular communications are presumably more difficult to perform than communications within a cellular network or between a moving vehicle and the roadside, where there is a large fixed infrastructure. It is assumed in this chapter that the mobile channel between the two vehicles is so rapidly variable that it is not possible to measure it in real-time. The authors therefore selected and considered only modulation and coding techniques for which the knowledge of the channel state was not necessary at both the transmitter and the receiver, that is, differential and noncoherent communications. To be realistic, only space-time coding communication systems with two transmit antennas were considered. The authors have purposely avoided too much theoretical development, with the intent of making clear that the implementation of all the techniques mentioned in this chapter, it should not be a too difficult task for the electronic technology of today. Future research directions are also suggested to conclude the chapter.