A Novel Cooperative Physical Layer Security Scheme for Satellite Downlinks

作者：Liu Jun^*; Wang Jingjing; Liu Weixin; Wang Qunyang; Wang Mengyuan

来源：Chinese Journal of Electronics, 2018, 27(4): 860-865.

DOI：10.1049/cje.2018.05.016

• Satellite communication
• Physical layer security
• Cooperative relay system
• Artificial noise

A physical layer security scheme based on cooperative relays is proposed to address the problem of eavesdropping in satellite downlink which is induced by the broadcasting nature of the shared communication medium and the long distance of the satellite-ground transmissions. By evaluating the outage probability, the relay nodes participating in cooperative communication can be divided into a cooperative forwarding group and a cooperative jamming group. The cooperative jamming group and the cooperative forwarding groups construct a cascaded channel which combined with the random weighting technique improves the quality of transmission on the main channel. The cooperative jamming group uses the main channel null space to transmit artificial noise which does not affect the quality of the main channel, but reduces the eavesdropping channel quality. Simulation results show that the proposed anti-eavesdropping scheme can maximize the quality difference between the main channel and the eavesdropping channels, which thereby may significantly improve the security capacity of satellite downlink systems.

• 出版日期2018-7
• 单位东北大学