Exploiting Subcarrier Agility to Alleviate Active Jamming Attacks in Wireless Networks


Malicious interference injection or jamming is one among the only ways that to disrupt wireless communications. Prior approaches can alleviate jamming interference to a restricted extent; they're particularly liable to a reactive jammer i.e., a jammer that injects noise upon sensing a legitimate transmission or wideband jamming. In this paper, we leverage the inherent options of OFDM (Orthogonal Frequency Division Multiplexing) to deal with such attacks. Specifically, via in depth experiments, we tend to observe that the jamming signal experiences differing levels of fading across the composite sub-carriers in its transmission bandwidth. Therefore, if the legitimate transmitter were to somehow exploit the relatively unaffected sub-carriers to transmit information to the receiver, it could achieve reasonable throughputs, even within the presence of the active jammer. We design and implement JIMS, a Jamming Interference Mitigation Theme that exploits the above characteristic by overcoming key practical challenges. Via extensive testbed experiments and simulations we show that JIMS achieves a throughput restoration of up to 75 percent in the presence of a lively jammer.

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