To Harvest and Jam: A Paradigm of Self-Sustaining Friendly Jammers for Secure AF Relaying
arXiv:1502.07066 · doi:10.1109/TSP.2015.2477800
Abstract
This paper studies the use of multi-antenna harvest-and-jam (HJ) helpers in a multi-antenna amplify-and-forward (AF) relay wiretap channel assuming that the direct link between the source and destination is broken. Our objective is to maximize the secrecy rate at the destination subject to the transmit power constraints of the AF relay and the HJ helpers. In the case of perfect channel state information (CSI), the joint optimization of the artificial noise (AN) covariance matrix for cooperative jamming and the AF beamforming matrix is studied using semi-definite relaxation (SDR) which is tight, while suboptimal solutions are also devised with lower complexity. For the imperfect CSI case, we provide the equivalent reformulation of the worst-case robust optimization to maximize the minimum achievable secrecy rate. Inspired by the optimal solution to the case of perfect CSI, a suboptimal robust scheme is proposed striking a good tradeoff between complexity and performance. Finally, numerical results for various settings are provided to evaluate the proposed schemes.
arXiv comment16 pages (double column), 8 figures, submitted for possible journal publication
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- Accumulate and Jam: Towards Secure Communication via A Wireless-Powered Full-Duplex Jammer
- Wireless Powered Cooperative Jamming for Secrecy Multi-AF Relaying Networks
- Cooperative Strategies for Wireless-Powered Communications: An Overview
- Exploiting Interference for Secrecy Wireless Information and Power Transfer
- Secure SWIPT for Directional Modulation Aided AF Relaying Networks
- Physical Layer Security Jamming: Theoretical Limits and Practical Designs in Wireless Networks
- Power Allocation for Secure SWIPT Systems with Wireless-Powered Cooperative Jamming