Wireless channel measurements, characterization and real-time emulation

Radio communication between vehicles in intelligent traffic systems and connected automated vehicles allows the avoidance of accidents by exchanging position, speed, direction of travel and other sensor data. The verification of the radio systems and vehicle control units is cost-intensive, time-consuming and difficult to repeat. For this reason, the AIT is developing a real-time emulation of the vehicular radio channel, based on a geometry based stochastic model that correctly emulate the non-stationary fading process of the vehicular radio channel.

The vehicle-to-X (V2X) communication channel is subject to a non-stationary time- and frequency selective fading process, i.e. the received field strength varies over time leading to varying frame error rates. The fading process is determined by the environment of the communication link and the position of the transmitter and receiver. For the repeatable test of connected autonomous driving algorithms, we will model the environment with low-complexity geometry based stochastic models. This allows for capturing the non-stationary fading conditions at road intersections represented by Delay- and Doppler dispersion as well as strong attenuation caused by larger object such as trucks or trains.