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Sensors 2016, 16(11), 1908; doi:10.3390/s16111908

Secure Multiuser Communications in Wireless Sensor Networks with TAS and Cooperative Jamming

1,†
,
1,†
,
1,†
,
2,†
,
1,†,* and 1,†
1
College of Communications Engineering, PLA University of Science and Technology, No. 2 Biaoying, Qinhuai District, Nanjing 210007, China
2
Research School of Engineering, Australian National University, Canberra, ACT 2601, Australia
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editors: Ignacio Bravo, Esther Palomar, Alfredo Gardel and José Luis Lázaro
Received: 5 September 2016 / Revised: 1 November 2016 / Accepted: 8 November 2016 / Published: 12 November 2016
(This article belongs to the Special Issue Trusted and Secure Wireless Sensor Network Designs and Deployments)
View Full-Text   |   Download PDF [498 KB, uploaded 18 November 2016]   |  

Abstract

In this paper, we investigate the secure transmission in wireless sensor networks (WSNs) consisting of one multiple-antenna base station (BS), multiple single-antenna legitimate users, one single-antenna eavesdropper and one multiple-antenna cooperative jammer. In an effort to reduce the scheduling complexity and extend the battery lifetime of the sensor nodes, the switch-and-stay combining (SSC) scheduling scheme is exploited over the sensor nodes. Meanwhile, transmit antenna selection (TAS) is employed at the BS and cooperative jamming (CJ) is adopted at the jammer node, aiming at achieving a satisfactory secrecy performance. Moreover, depending on whether the jammer node has the global channel state information (CSI) of both the legitimate channel and the eavesdropper’s channel, it explores a zero-forcing beamforming (ZFB) scheme or a null-space artificial noise (NAN) scheme to confound the eavesdropper while avoiding the interference to the legitimate user. Building on this, we propose two novel hybrid secure transmission schemes, termed TAS-SSC-ZFB and TAS-SSC-NAN, for WSNs. We then derive the exact closed-form expressions for the secrecy outage probability and the effective secrecy throughput of both schemes to characterize the secrecy performance. Using these closed-form expressions, we further determine the optimal switching threshold and obtain the optimal power allocation factor between the BS and jammer node for both schemes to minimize the secrecy outage probability, while the optimal secrecy rate is decided to maximize the effective secrecy throughput for both schemes. Numerical results are provided to verify the theoretical analysis and illustrate the impact of key system parameters on the secrecy performance. View Full-Text
Keywords: wireless sensor networks; physical layer security; multiuser scheduling; transmit antenna selection; cooperative jamming; secrecy outage probability; effective secrecy throughput wireless sensor networks; physical layer security; multiuser scheduling; transmit antenna selection; cooperative jamming; secrecy outage probability; effective secrecy throughput
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yang, M.; Zhang, B.; Huang, Y.; Yang, N.; Guo, D.; Gao, B. Secure Multiuser Communications in Wireless Sensor Networks with TAS and Cooperative Jamming. Sensors 2016, 16, 1908.

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