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Double-Directional Channel Characterization of Truck-to-Truck Communication in Urban Environment

This paper reports the first truck-to-truck (T2T) wireless channel measurement conducted at 5.9GHz with multiple antennas at both transmitter and receiver. We present directional analysis of a sample route in downtown Los Angeles, CA USA, where two trucks drive towards each other. Measurements are performed with a self-built real-time MIMO channel sounder and evaluated with RiMAX, a high resolution parameter estimation algorithm, providing time-of-arrival, directional of departure, directional of arrival and Doppler shift for discrete multipath components as well as diffuse multipath scattering. Compared to vehicular channels for passenger cars, our measurements show that the metallic trailer, which is higher than the installed antennas, acts as a strong reflector in line-of-sight (LOS) condition and increases the average received power and angular spread. The extra power attenuation however can be as high as 35dB after two trucks pass each other and the trailers obstruct the LOS.