Cooperative-Jamming-Aided Secrecy Enhancement in Wireless Networks With Passive Eavesdroppers

This paper investigates cooperative security in wireless networks, where a source (Alice) intends to transmit a confidential message to a legitimate destination (Bob), with the help of a cooperative jammer (Charlie), coexisting with multiple passive eavesdroppers (Eves). In particular, by assuming k...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2018-03, Vol.67 (3), p.2108-2117
Main Authors: Hu, Lin, Wen, Hong, Wu, Bin, Tang, Jie, Pan, Fei, Liao, Run-Fa
Format: Article
Language:English
Subjects:
Array signal processing
Artificial noise (AN)
Beamforming
Closed-form solutions
Communication channels
cooperative jamming (CJ)
Eavesdropping
Jamming
Mathematical analysis
Optimization
physical layer security
Resource management
secrecy outage probability (SOP)
secrecy rate
secure energy efficiency (EE)
Signal to noise ratio
Statistical analysis
Transmitting antennas
Wireless networks
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Summary:This paper investigates cooperative security in wireless networks, where a source (Alice) intends to transmit a confidential message to a legitimate destination (Bob), with the help of a cooperative jammer (Charlie), coexisting with multiple passive eavesdroppers (Eves). In particular, by assuming knowledge of Bob's perfect channel state information (CSI) but only Eves' statistical CSIs, secrecy beamforming with artificial noise (AN) is utilized for secure transmission, and cooperative jamming (CJ) is explored to further enhance secrecy. We first derive an accurate closed-form expression for the secrecy outage probability (SOP), and establish the condition under which positive secrecy rate is achievable. Then, we provide a secure transmit design for maximizing the SOP constrained secrecy rate. Moreover, based on a strict mathematical analysis, we characterize the impact of the main channel quality and the number of Eves on transmit design and secrecy performance. Specifically, optimal power allocation ratio between the information-bearing signal and the AN signal increases as the main channel quality improves, and decreases with the number of Eves. Numerical results confirm that our design achieves performance improvement in terms of both secrecy rate and secure energy efficiency, as compared to the approach without CJ.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2017.2744660