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Vehicle-to-vehicle communications is essential to create cooperative awareness amongst vehicles, improve roadway safety and roadway capacity, and reduce green house gas emissions. As vehicle density increases, the amount of cooperative awareness messages also increases, which in turn increases the amount of background interference in the wireless channel. Transmission under high degree of background interference reduces the reliability of the packet. Adjusting transmission parameters such as transmission power or backoff mechanism may reduce interference, but they also decrease efficiency of packet transmission. This paper quantifies the tradeoff between transmission efficiency and reliability, and shows how various transmission parameters affect overall system performance under different vehicle densities.
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