Detection of Reactive Jamming in DSSS-Based Wireless Networks

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The authors propose a novel approach to detect reactive jammers in Direct Sequence Spread Spectrum (DSSS) wireless networks. The key idea is to use the chip error rate of the first few jamming-free symbols at the DSSS demodulator during the signal synchronization phase of regular packet reception to estimate the probability of successful packet delivery. If the estimated probability is significantly higher than the actual packet delivery ratio, they declare jamming. As a proof of concept, they implement a prototype in a network of three USRP software-defined radios (transmitter, receiver, and jammer) and evaluate the feasibility, responsiveness, and accuracy of their approach in a controlled lab environment.