Secure multiple-input single-output communication – Part I: secrecy rates and switched power allocation

Thang Van Nguyen; Youngmin Jeong; Jin Sam Kwak; Hyundong Shin

Secure multiple-input single-output communication – Part I: secrecy rates and switched power allocation

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Author(s): Thang Van Nguyen ¹ ; Youngmin Jeong ¹ ; Jin Sam Kwak ² ; Hyundong Shin ¹
- Affiliations: 1: Department of Electronics and Radio Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Korea;
  2: WILUS Institute of Standards and Technology, 263-2 Yangjae-dong, Seocho-gu, Seoul 137-894, Korea
Source: Volume 8, Issue 8, 22 May 2014, p. 1217 – 1226
DOI: 10.1049/iet-com.2013.0563 , Print ISSN 1751-8628, Online ISSN 1751-8636

Received 03/07/2013, Accepted 17/09/2013, Revised 31/08/2013, Published 06/03/2014

The use of multiple-antenna arrays has attracted much attention for the physical layer security of wireless systems, where the so-called artificial-noise solution can be applied to enhance the communication confidentiality. In the first part of this study, the authors consider secure communication over a multiple-input single-output Rayleigh-fading channel in the presence of a multiple-antenna eavesdropper – referred to as a multiple-input single-output multiple-eavesdropper (MISOME) wiretap channel. Specifically, secure beamforming with artificial noise is treated when the transmitter has access to full channel state information (CSI) of a legitimate channel but only partial CSI of an eavesdropper channel. First, the optimal power allocation between the information-bearing signal and artificial noise (or simulated interference) is derived to maximise the achievable secrecy rate in the presence of a weak or strong eavesdropper. Then, the first-order optimal power allocation strategy is developed in a switched fashion by selecting the best of weak- and strong-eavesdropper solutions for a general eavesdropping attack, and a closed-form expression is derived for the ergodic secrecy rate achieved by secure beamforming with this switched power allocation in the MISOME wiretap channel. The numerical results show that the switched power allocation is a simple but effective approach that nearly achieves the optimal secrecy rate.

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Secure multiple-input single-output communication – Part I: secrecy rates and switched power allocation

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