Vehicle-to-vehicle communications in mixed passenger-freight convoys : [final report].
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2016-09-01
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Abstract:Vehicle convoys (platoons) hold a promise for significant efficiency improvements of freight and
passenger transportation through better system integration. Through the use of advanced driver
assistance, vehicles in a convoy can keep shorter distances from each other, thus decreasing energy
consumption and traffic jams. However, reliable and low-latency communications are a vital
prerequisite for such systems.
The standard for Vehicle-to-Vehicle (V2V) wireless communications is IEEE 802.11p, and
its performance for communication between passenger cars has been widely explored. However,
there are hardly any results about the performance of such systems when both trucks and passenger
cars are present. In order to remedy this situation, we first perform in the framework of this project
extensive measurement campaigns of the propagation channel between cars and trucks, and between
cars whose connection is blocked by trucks. These scenarios are clearly of great importance
for mixed-traffic convoys, yet have not yet been explored or measured in the open literature. For
that purpose, we constructed antenna arrays in order to characterize the double directional characteristics
of the underlying propagation channel, as well as a wideband and directional channel
sounder with high precision synchronization based on software defined radio platforms. The measured
data are then used as the inputs of a IEEE 802.11p communication system simulator, which
tells us not only the probability of successful communication between vehicles but also helps to
analyze robust methods such as multi-hop to resolve the situations where direct communications
are not successful. Its outputs constitute an important input for the design of convoy policies,
enhanced automated driver assistance, and even self-driving cars.
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