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Topology Adaptation for Robust Ad Hoc Cyberphysical Networks under Puncture-Style Attacks

Tsinghua Science and Technology 2015年第4期20卷 364-375页

作者： Ying Liu wade trappe Department of Electrical and Computer Engineering Rutgers University

Many cyber physical networks will involve ad hoc deployments utilizing peer-to-peer communications. Examples include transportation systems where a group of moving cars communicate in order to avoid collisions, teams of robotic agents that work together in support of disaster recovery, and sensor networks deployed for health-care monitoring, monitoring the operation of a factory plant or to coordinate and actuate mechanisms for energy conservation in a building. These networks may face a variety of threats that puncture their connectivity and, should their performance degrade, the result could be catastrophic. Consider, for example, a vehicular ad hoc network where communication assists collision avoidance. In such a case, degradation could lead to vehicle accidents. Therefore, in order to overcome network performance degradations and the puncture of a network （such as blackhole or jamming） which is under attack, we propose an algorithm called the Fiedler Value Power Adjustment Topology Adaption （FVPATA）. FVPATA aims to dynamically adapt an ad hoc network＇s topology, even if the attacker varies its location and in the case of an interference-style attack by increasing the interference power. The algorithm utilizes the formulation from the graph theory which works with the Fiedler value to guide each node in wireless ad hoc network utilizing power adjustments to enhance the network＇s overall robustness. The advantage of the proposed mechanism is that it is a light-weight approach which is totally distributed, based on topology updates inherent in the Optimized Link State Routing （OLSR） protocol and, hence, it is unnecessary to introduce additional messages. Additionally, an algorithm was developed to resolve problems involving asymmetric links that arise in ad hoc networks by eliminating unnecessary energy consumption of Fiedler nodes. Simulation results using NS3 show that the proposed mechanism successfully decreases the average amount of hops used by 50% and the d

关键词： algebraic connectivity Fiedler value topology adaptation distributed power control ad hoc networks

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Distributed Beamforming Based Wireless Power Transfer:Analysis and Realization

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Tsinghua Science and Technology 2020年第6期25卷 758-775页

作者： Xiaoran Fan Han Ding Yanyong Zhang wade trappe Zhu Han Rich Howard the Wireless Information Network Laboratory(WINLAB) Rutgers UniversityNew BrunswickNJ 08901USA the Department of Computer Science and Technology Xi'an Jiaotong UniversityXi'an 710049China the Department of Computer Science and Technology University of Science and Technology of ChinaHefei 230052China the Department of Electrical and Computer Engineering University of HoustonHoustonTX 77004USA.

This paper presents a new Wireless Power Transfer(WPT)approach by aligning the phases of a group of spatially distributed Radio Frequency(RF)transmitters(TX)at the target receiver(RX)*** approach can transfer energy over tens of meters and even to targets blocked by *** to popular beamforming based WPTs,our approach leads to a drastically different energy density distribution:the energy density at the target receiver is much higher than the energy density at other *** to this unique energy distribution pattern,our approach offers a safer WPT solution,which can be potentially scaled up to ship a higher level of energy over longer ***,we model the energy density distribution and prove that our proposed system can create a high energy peak exactly at the target *** we conduct detailed simulation studies to investigate how the actual energy distribution is impacted by various important system parameters,including number/topology of transmitters,transmitter antenna directionality,the distance between receiver and transmitters,and environmental ***,we build an actual prototype with 17 N210 and 4 B210 Universal Software Radio Peripheral(USRP)nodes,through which we validate the salient features and performance promises of the proposed system.

关键词： Wireless Power Transfer(WPT) distributed beamforming wireless network

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A Physical-Layer Technique to Enhance Authentication for Mobile Terminals

A Physical-Layer Technique to Enhance Authentication for Mob...

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2008 IEEE International Conference on Communications(ICC 2008)

作者： Larry Greenstein Narayan Mandayam wade trappe Wireless Information Network Laboratory （WINLAB） Rutgers University 671 Rt.1 SouthNorth BrunswickNJ 08902

We propose an enhanced physical-layer authentication scheme for multi-carrier wireless systems,where transmission bursts consist of multiple *** specifically,it is based on the spatial variability characteristic of wireless channels,and able to work with moderate terminal *** the authentication of the first frame in each data burst,the legal transmitter uses the saved channel response from the previous burst as the key for authentication of the first frame in the next *** key is obtained either via feedback from the receiver,or using the symmetric channel property of a TDD *** the authentication of the following frames in the burst is performed either by a Neyman-Pearson hypothesis test,or a least-squares adaptive channel *** in a typical indoor building show that the scheme based on the Neyman-Pearson test is more robust against terminal mobility,and is able to detect spoofing attacks efficiently with small system overhead when the terminal moves with a typical pedestrian speed.

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