Problem Statement and Motivation

In multihop ad hoc networks, a jammer can drastically disrupt the flow of information by intentionally interfering with links between a subset of nodes. The impact of such attacks can escalate when the jammer is moving. As a countermeasure for such attacks, adaptive beam-forming techniques can be employed for spatial filtering of the jamming signal. Considering a moving jammer, a distributed beam nulling framework is proposed. The framework uses periodic measurements of the RF environment to detect direction of arrival (DoA) of jamming signal and suppresses the signals arriving from the current and predicted locations of the jammer. Also, in the calculation of the nulled region, this framework considers and counters the effects of randomness in the mobility of the jammer, as well as errors in beam nulling and DoA measurements. Survivability of links and connectivity in such scenarios are studied by simulating various node distributions and different mobility patterns of the attacker. Also, the impact of errors in the estimation of DoA and beam-forming on the overall network performance is also examined.



  1. S Bhunia, V Behzadan, P A Regis and S Sengupta, “Adaptive Beam Nulling in Multihop Ad Hoc Networks Against a Jammer in Motion”, To appear in Elsevier Computer Networks. DOI:10.1016/j.comnet.2016.06.030.

  2. S Bhunia and S Sengupta, “Distributed Adaptive Beam Nulling to Mitigate Jamming in 3D UAV Mesh Networks”, to appear in International Conference on Computing, Networking and Communications (ICNC) 2017, Silicon Valley, USA,

  3. S Bhunia, V Behzadan, P A Regis and S Sengupta, “Performance of Adaptive Beam Nulling in Multihop Ad-Hoc networks under Jamming”, IEEE International Symposium on Cyberspace Safety and Security (CSS 2015), New York.