Document Type

Conference Paper

Date of this Version

4-2009

Comments

Suggested Citation:
Pajic, M. and R. Mangharam. “Anti-Jamming for Embedded Wireless Networks”. ACM International Conference on Information Processing in Sensor Networks (IPSN'09). April 2009.

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Abstract

Resilience to electromagnetic jamming and its avoidance are difficult problems. It is often both hard to distinguish malicious jamming from congestion in the broadcast regime and a challenge to conceal the activity patterns of the legitimate communication protocol from the jammer. In the context of energy-constrained wireless sensor networks, nodes are scheduled to maximize the common sleep duration and coordinate communication to extend their battery life. This results in well-defined communication patterns with possibly predictable intervals of activity that are easily detected and jammed by a statistical jammer. We present an anti-jamming protocol for sensor networks which eliminates spatio-temporal patterns of communication while maintaining coordinated and contention-free communication across the network. Our protocol, WisperNet, is time-synchronized and uses coordinated temporal randomization for slot schedules and slot durations at the link layer and adapts routes to avoid jammers in the network layer. Through analysis, simulation and experimentation we demonstrate that WisperNet reduces the efficiency of any statistical jammer to that of a random jammer, which has the lowest censorship-to-link utilization ratio. WisperNet has been implemented on the FireFly sensor network platform.

Keywords

Anti-Jamming, Wireless Networks

 

Date Posted: 16 September 2010

This document has been peer reviewed.