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IEEE 802.11 wireless transmissions suffer from a big security flaw as they are vulnerable to Denial of Service (DoS) attacks which can degrade severely their performance, especially their achieved throughput. One of the most harmful forms of these attacks is the jamming. In this paper, the authors provide an analytical model to study the effect of jamming on WLANs. Hence, they implement a physical layer jamming to show the effect at the MAC layer level (i.e. cross-layer jamming). Different jamming scenarios, with different modulation techniques such as Direct Sequence Spread Spectrum (DSSS) and Orthogonal Frequency Division Multiplexing (OFDM), are distinguished in order to evaluate the most accurately possible the effect of jamming on WLANs performance.
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