Abstract
Mobile ad hoc networks (MANETs) are dynamic mobile networks that can be formed in the absence of any preexisting communication infrastructure. MANETs are vulnerable to jamming attack due to their salient characteristics. The objective of a jammer is to interfere with legitimate wireless communications, and to degrade the overall QoS of the network. In this paper, we propose a new method to react at jamming attacks. The military has long dealt with jamming by using frequency-hopping spread spectrum communication. Unlike frequency hopping that takes place at the PHY layer, our purpose takes place at the MAC layer.