دانلود رایگان مقاله نولینگ پرتو تطبیقی در شبکه ادهوک در برابر فرستنده برای سیگنالهای متراکم در جنبش

Abstract

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. This paper investigates the performance of adaptive beam nulling as a mitigation technique against jamming attacks in multihop ad hoc networks. 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. In comparison with an omnidirectional configuration, results indicate a 57.27% improvement in connectivity under jamming when the proposed framework is applied.

5. Conclusion and future works

This paper proposes a framework for adaptive beam nulling in multihop ad hoc networks as a mitigation technique against a moving jammer. Performance of the proposed framework is studied through physical layer and full-stack network simulations of various network topologies and mobility models of the jammer in both 2-dimensional and 3-dimensional environments. Obtained results indicate that employing this framework leads to significant improvements in survivability of the links and connectivity over the performance of networks with omnidirectional interfaces. Also, to increase the accuracy of the simulated models for practical implementations, effects of varying inherent errors on the performance of a beam nulling ad hoc network is studied.