Andreas Kwoczek

Overview of Vehicle-to-Vehicle Radio Channel Measurements for Collision Avoidance Applications

In this paper we present an overview of a vehicle-to-vehicle radio channel measurement campaign at 5.6GHz. The selected measurement scenarios are based on important safety-related applications. We explain why these scenarios are interesting from the aspect of radio propagation. Further we describe the power-delay profile and the Doppler spectral density of two situations especially suitable for collision avoidance applications: A traffic congestion situation where one car is overtaking another one, and a general line-of-sight obstruction between the transmitter and the receiver car. The evaluations show that in these situations the radio channel is highly influenced by the rich scattering environment. Most important scatterers are traffic signs, trucks, and bridges, whereas other cars do not significantly contribute to the multipath propagation.

Influence of car panorama glass roofs on Car2Car communication (poster)

The Car2Car communication will use a reserved frequency band at 5.9 GHz. One of the key requirements for a Car2Car antenna is that the gain is concentrated in the horizontal plane, which is a problem due to the limited ground plane of a car roof. The influence of roof curvature, roof racks and panorama glass roofs were investigated to quantify them. To the authors knowledge such measurements have not been published yet. Three different antennas were simulated and measured on round ground planes and real car roofs in different configurations. The configuration with a panorama glass roof showed an unexpected high loss of gain in the direction of the glass roof in the range of 15 to 20 dB which result in a drastically reduced communication range to the front direction. This phenomenon is still under investigation.

Vehicle-to-Vehicle Communications

This chapter discusses major results and conclusions from Special Interest Group C bringing together various aspects of mobile to mobile communication from all working groups. Vehicle-to-vehicle co ...

Automotive requirements for future mobile networks

We present future use cases from the field of Advanced Driver Assistance Systems (ADAS) and discuss the imposed requirements on communications systems. The presented use cases show that there exist very strict requirements in terms of data rate, end-to-end latency, and reliability. These requirements cannot be fulfilled by existing technologies. We attempt to emphasize that proper development of beyond 4G solutions will potentially enable a new range of safety and driver assistance services.