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Artificial Noise Injection and Its Power Loading Methods for Secure Space-Time Line Coded Systems

1
School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06974, Korea
2
School of Electronics and Information Engineering, Korea Aerospace University, Gyeonggi-do 10540, Korea
3
Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea
*
Author to whom correspondence should be addressed.
Entropy 2019, 21(5), 515; https://doi.org/10.3390/e21050515
Received: 4 May 2019 / Revised: 16 May 2019 / Accepted: 20 May 2019 / Published: 22 May 2019
(This article belongs to the Section Information Theory, Probability and Statistics)
In this paper, we consider a 2 × 2 space-time line coded (STLC) system having two-transmit and two-receive antennas. To improve the secrecy rate of the STLC system, in which an illegitimate receiver eavesdrops the information delivered from the STLC transmitter to the STLC receiver, we propose an artificial noise (AN) injection method. By exploiting the STLC structure, a novel AN for the STLC is designed and its optimal power loading factor is derived. Numerical results verify that the proposed secure STLC systems with the designed AN injection and the power control method can significantly improve the secrecy rate compared to the conventional STLC systems. It is observed that the proposed method is more effective if there is a significant gap between the main-channel and the eavesdropper-channel gains. View Full-Text
Keywords: space-time line code; physical layer security; secrecy rate; artificial noise; power control space-time line code; physical layer security; secrecy rate; artificial noise; power control
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Joung, J.; Choi, J.; Jung, B.C.; Yu, S. Artificial Noise Injection and Its Power Loading Methods for Secure Space-Time Line Coded Systems. Entropy 2019, 21, 515.

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