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Relaying for IEEE 802.11p at road intersection using a vehicular non-stationary channel model

: Xu, Z.; Bernado, L.; Gan, M.; Hofer, M.; Abbas, T.; Shivaldova, V.; Mahler, K.; Smely, D.; Zemen, T.


Institute of Electrical and Electronics Engineers -IEEE-:
IEEE 6th International Symposium on Wireless Vehicular Communications, WiVeC 2014. Proceedings : Vancouver, Canada, 14-15 September 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-4452-1
ISBN: 978-1-4799-4453-8
6 S.
International Symposium on Wireless Vehicular Communications (WiVeC) <6, 2014, Vancouver>
Fraunhofer HHI ()

Traffic safety at road intersections can be improved by establishing reliable communications between vehicles. For vehicle-to-vehicle communications, this requires information exchange in non line-of-sight (NLOS) conditions due to the obstruction by buildings. In order to overcome the low receive signal-to-noise ratio (SNR) due to NLOS, we consider to place a relay at road intersections to enhance the reliability of communication links. In this paper, we implement a vehicular non-stationary geometry based stochastic channel model for road intersections, which is an extension of an existing highway channel model. The model is verified by comparison with vehicular channel measurements. Using the proposed channel model, we present link level simulation results for IEEE 802.11p relaying at varying transmitter/receiver locations using different channel estimation techniques. The results show that a relay at the intersection is able to greatly extend the reliable communications region. Besides, in the high SNR regime with moderate or high mobility transmitter and receiver, the block type least square channel estimator is the bottleneck that limits the relaying performance. An advanced iterative channel estimator is also simulated, which exhibits robustness against increased vehicle velocities.