Multi-Antenna Wireless Legitimate Surveillance Systems: Design and Performance Analysis

To improve national security, government agencies have long been committed to enforcing powerful surveillance measures on suspicious individuals or communications. In this paper, we consider a wireless legitimate surveillance system, where a full-duplex multi-antenna legitimate monitor aims to eaves...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2017-07, Vol.16 (7), p.4585-4599
Main Authors: Zhong, Caijun, Jiang, Xin, Qu, Fengzhong, Zhang, Zhaoyang
Format: Article
Language:English
Subjects:
Antennas
Array signal processing
beamformer design
Beamforming
Communications systems
Complexity
Cybersecurity
Design analysis
Design improvements
Eavesdropping
Exact solutions
full-duplex
Government agencies
Jamming
Monitoring
power control
Proactive eavesdropping
Receiving antennas
SISO (control systems)
Surveillance
Surveillance systems
Systems analysis
Wireless communication
Wireless communications
wireless legitimate surveillance
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Summary:To improve national security, government agencies have long been committed to enforcing powerful surveillance measures on suspicious individuals or communications. In this paper, we consider a wireless legitimate surveillance system, where a full-duplex multi-antenna legitimate monitor aims to eavesdrop on a dubious communication link between a suspicious pair via proactive jamming. Assuming that the legitimate monitor can successfully overhear the suspicious information only when its achievable data rate is no smaller than that of the suspicious receiver, the key objective is to maximize the eavesdropping non-outage probability by joint design of the jamming power, receive and transmit beamformers at the legitimate monitor. Depending on the number of receive/transmit antennas implemented, i.e., single-input single-output, single-input multiple-output, multiple-input single-output, and multiple-input multiple-output (MIMO), four different scenarios are investigated. For each scenario, the optimal jamming power is derived in a closed form and efficient algorithms are obtained for the optimal transmit/receive beamforming vectors. Moreover, low-complexity suboptimal beamforming schemes are proposed for the MIMO case. Our analytical findings demonstrate that by exploiting multiple antennas at the legitimate monitor, the eavesdropping non-outage probability can be significantly improved compared with the single-antenna case. In addition, the proposed suboptimal transmit zero-forcing scheme yields similar performance as the optimal scheme.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2017.2700379