Performances analysis of vehicle-to-X communication systems

This paper investigates the influence of the inter-carrier interference on a vehicle to infrastructure (V2X) communication system, which has been defined in the IEEE 802.11p standard. The frequency shift due to high speed of cars destroys the orthogonality between subcarriers in OFDM signals and rises the inter-carrier interference (ICI). The main contributions of this paper are proposed analytic formulas and simulation results of the signal to interference power ratio (SIR) by considering the statistical effects of ICI and evaluation of symbol error rate (SER) for several types of fading and Doppler spread in time domain approach. The results show that for the Rayleigh fading model, SIR decreases when the maximum Doppler spread increases. On the other hand, in the Rician channel, SIR depends not only on maximum Doppler spread but also on the angle of arrival (AoA) and Rician factor of the LOS component. Moreover, the simulation result in terms of SER is obtained for different channel models. It shows an excellent agreement between the theoretical calculation of SIR and the simulation results of SER.