A Measurement Driven Anti-Jamming System for 802.11 Networks
Dense, unmanaged 802.11 deployments tempt saboteurs into launching jamming attacks by injecting malicious interference. Now-a-days, jammers can be portable devices that transmit intermittently at low power in order to conserve energy. In this paper, the authors first conduct extensive experiments on an indoor 802.11 network to assess the ability of two physical layer functions, rate adaptation and power control, in mitigating jamming. In the presence of a jammer they find that: the use of popular rate adaptation algorithms can significantly degrade network performance and, appropriate tuning of the carrier sensing threshold allows a transmitter to send packets even when being jammed and enables a receiver capture the desired signal.