LIU Jun, WANG Jingjing, LIU Weixin, WANG Qunyang, WANG Mengyuan. A Novel Cooperative Physical Layer Security Scheme for Satellite Downlinks[J]. Chinese Journal of Electronics, 2018, 27(4): 860-865. doi: 10.1049/cje.2018.05.016
Citation: LIU Jun, WANG Jingjing, LIU Weixin, WANG Qunyang, WANG Mengyuan. A Novel Cooperative Physical Layer Security Scheme for Satellite Downlinks[J]. Chinese Journal of Electronics, 2018, 27(4): 860-865. doi: 10.1049/cje.2018.05.016

A Novel Cooperative Physical Layer Security Scheme for Satellite Downlinks

doi: 10.1049/cje.2018.05.016
Funds:  This work is supported by the National Natural Science Foundation of China (No.61671141, No.61501038, No.61401079), Special Fundamental Research Fund for Central Universities (N120404003), and China Aerospace Science and Technology Corporation Satellite Application Research Institute Innovation Fund (No.2014-CXJJ-TX-11).
  • Received Date: 2016-03-15
  • Rev Recd Date: 2016-05-11
  • Publish Date: 2018-07-10
  • 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.
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