Joint distributed beamforming and jamming schemes in decode-and-forward relay networks for physical layer secrecy

Abstract

In this paper, we propose joint cooperative beamforming and jamming schemes in decode-and-forward (DF) relay networks for physical layer secrecy. In DF relay networks, only the relays decoding the message from the source correctly have to join in the forwarding phase and the relays with decoding error are not utilized sufficiently. Taking this property into consideration, we let the relays decoding successfully transmit information signals and the relays decoding in error transmit jamming signal to improve the secrecy capacity of system. For this purpose, we design a bi-level optimization algorithm to search the optimal beamforming vector and jamming vector for the relays via the semi-definite relaxation (SDR). In addition, for balancing the cost of system and secrecy performance, we also study some suboptimal schemes to improve information secrecy. Finally, the simulation results show that the optimal scheme outperforms all other simulated schemes and the suboptimal schemes achieve good tradeoff between secrecy performance and computational complexity.

A Comprehensive Survey on Cooperative Relaying and Jamming Strategies for Physical Layer Security

“…[255] --Proposed an adaptive cooperative relaying and jamming secure transmission scheme to protect the confidential messages where the legitimate receiver adopts the energy detection method to detect the jamming-aided eavesdropper's action and a cooperative node aid the secure transmission through cooperative relaying under jamming attack under eavesdropping attack. [256] --Proposed a bi-level optimization algorithm for deriving the optimal jamming and beamforming vector. [257] -Proposed a scheme for jointly optimizing the bandwidth and time in DF relaying while satisfying the secrecy requirements through jamming.…”