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Summary form only given: In existing wireless telecommunication systems a user can choose either a high data rate or a high mobility. For various applications it would be desirable to have both at the same time: the freedom to move with a very high velocity without loosing the high data rate. Systems based on orthogonal frequency division multiplexing (OFDM) seem to be suitable to satisfy these conditions. However, the high-speed aspect has to be considered more closely. High-speed links between receivers and transmitters cause varying Doppler, delay and angular spread, which may result in inter-carrier interference (ICI) and inter-symbol interference (ISI). ICI and ISI are both a challenge and a limiting factor for a wireless communication system. Applications for high-speed mobiles are for example on planes, high-speed trains, cars, and so on. Several scenarios for C2C communications are chosen for the simulations and verified by measurements. For cars these are urban and a free way scenarios with buildings or forest environments. For the wave propagation a 3D ray-tracing tool, based on the theory of geometrical optics (GO) and the uniform theory of diffraction (UTD), is used. The model includes modified Fresnel reflection coefficients for the reflection and the diffraction based on the UTD. The propagation channels are characterized by delay spread, Doppler spread and angular spread for different situations. These statistical parameters are compared to measurements. The influence on C2C communications will be demonstrated. Dynamic simulations will be illustrated by movies. The traffic scenarios are real world with multiple lanes, line of sight and non line of sight.