Evaluation of adjacent channel interference in single radio vehicular Ad-Hoc networks

VANETS extend the driver´s horizon to decrease traffic accidents by utilizing IEEE 802.11p wireless networks. In high density traffic situations an overloaded communication channel leads to significant packet loss. To overcome this problem multiple channels can be used in IEEE 802.11p. This itself leads to adjacent channel interference and impacts the performance of nearby channels. In this paper we define performance requirements with respect to packet loss and communication range. We show the impact of ACI on simultaneous channel usage by using our multi channel propagation extension for JiST/SWANS. We evaluate the performance on adjacent channels with respect to maximum channel load and variable transmit power. Our results show that the simultaneous usage of nearby channels is an serious issue when no channel access synchronization is applied.