A novel anti-jamming method in wireless sensor networks: Using artificial noise to actively interfere the intelligent jammer

In wireless sensor networks, the shared wireless medium and the broadcast nature make the network vulnerable to intelligent jamming attacks. Such attacks are launched timely by eavesdropping on packets being sent across the network. They can severely affect the network capacity to execute its preset functions. In order to address this issue, we propose a novel anti-jamming method which uses the jammer location as the prerequisite to restore the communication links. The proposed method is based on using the artificial noise generated by the synergistic sensor nodes to degrade the wiretap channel of jammer. The feasibility of our method is theoretically proved with the possible network and jammer model. We also provide a simplified scheme to estimate some unknown parameters which are important for practical application. Extensive experiments are conducted in MATLAB to evaluate the effectiveness and performance of our method. The experimental results suggest that the proposed method can make the jammer unable to correctly decode the received packets because of the low Signal-to-Noise Ratio, and significantly restore the communication links by increasing the Packet Send Ratio (PSR)/Packet Delivery Ratio (PDR) at the transmitter/receiver side.