Physical-layer security enhancement via power allocation between pilot and data jamming

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In this paper, we consider the multiple-input single-output (MISO) wiretap channel with a cooperative jammer (CJ). Motivated by the fact that corrupting pilot signals can effectively degrade the channel estimation at the eavesdropper (Eve), we emphasize that the physical-layer security can be enhanced by introducing jamming signals in pilot phase. Therefore, we propose a cooperative jamming scheme which delivers artificial noise (AN) both in pilot and data phases, unlike the conventional schemes that transmit AN only in data phase. More specifically, we optimize the jamming power allocation between pilot phase and data phase, along with designing the beamforming vector at the CJ. Furthermore, considering the limitation of energy budget at the CJ, the energy efficiency of the proposed scheme is investigated based on the circuit power consumption model. Finally, numerical results verify the performance of the proposed scheme, in terms of secrecy rate and energy efficiency.
Publisher
Institute of Electrical and Electronics Engineers Inc.
Issue Date
2017-01-10
Language
English
Citation

14th IEEE Annual Consumer Communications and Networking Conference (CCNC), pp.986 - 991

ISSN
2331-9852
DOI
10.1109/CCNC.2017.7983267
URI
http://hdl.handle.net/10203/227749
Appears in Collection
EE-Conference Papers(학술회의논문)
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