Journal of Astronautics ›› 2019, Vol. 40 ›› Issue (12): 1444-1452.doi: 10.3873/j.issn.1000-1328.2019.12.008

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Research on Secure Transmission of Forward Link in Hybrid Satellite Terrestrial Communications Networks

JIN Xin, REN Bao quan, LI Hong jun, GONG Xiang wu, Dong Fei hong   

  1. 1. National Innovation Institute of Defense Technology, Academy of Military Sciences, Beijng 100071, China;
    2. Institute of Systems Engineering, Academy of Military Sciences, Beijing 100141, China;
    3. School of Space Information, Space Engineering University, Beijing 101416, China
  • Received:2018-10-12 Revised:2019-04-02 Online:2019-12-15 Published:2019-12-25

Abstract: For the secrecy problem of eavesdropping link with partly imperfect channel state information (CSI) and imperfect channel state information in the forward link of hybrid satellite-terrestrial communications networks, this paper proposes a secure transmission scheme which considers the signals of the terrestrial base station as a cooperative interference. The optimization target is to maximize the transmission rate of the terrestrial base station node and ensure the QoS of the satellite legitimate terminal, while jamming the satellite potential eavesdropper by using the signals of the terrestrial base station. The secure transmission scheme is transformed into the convex optimization problems by using the semi-definite relaxation principle, respectively solved by the layer-iterative, Gauss randomized, and binary search algorithms. The simulation results show that the proposed schemes can reduce the sensitivity of the networks to the CSI error and improve the networks reliability and security.

Key words: Hybrid satellite-terrestrial communications networks, Secure transmission, Cooperative jamming, Secrecy rate

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