in this paper, the performance of IEEE 802.Ilb and 802.1 l g Wireless Local Area Networks (WLANs) performance under barrage jamming is evaluated theoretically and using measurements. Single WLAN ad-hoc link performance is measured when receiver station is jammed. W M link vulnerability assessment is based on throughput and Packet Error Rate (PER), which depends on d$-ferent Physical (PHY) layer characteristic. WLAN system is found to be more tolerant to narrow-band jamming than tu wideband-band jamming. In 802.1 I b WLAN, processing gain increases the tolerance to jamming whereus coding and diferent modulations are used to improve the link performance in 802.1 l g WLAN. Measured link throughputs are far from theuretical values, especially when high datu rate modes are used.

In this paper, the performance of a Mobile Ad-hoc Network (MANET) is studied in a military environment. Link level simulations are based on the IEEE 802.11b standard and mobility is modelled using the random waypoint model. The military environment consists of jamming and vegetation. Jamming sources are Unattended Jammer (UAJ) and Unmanned Aerial Vehicle (UA V). The results show that both of the jammers can considerably debitilate the network connectivity.

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