A Novel Cooperative Physical Layer Security Scheme for Satellite Downlinks

作     者：LIU Jun WANG Jingjing LIU Weixin WANG Qunyang WANG Mengyuan 

作者机构：College of Computer Science and Engineering Northeastern University Satellite Information Engineering Research Institute of Beijing 

出 版 物：《Chinese Journal of Electronics》 (电子学报(英文))

年 卷 期：2018年第27卷第4期

页      面：860-865页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 0810[工学-信息与通信工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080402[工学-测试计量技术及仪器] 0804[工学-仪器科学与技术] 081001[工学-通信与信息系统] 

基　　金：supported by the National Natural Science Foundation of China(No.61671141,No.61501038,No.61401079) Special Fundamental Research Fund for Central Universities(N120404003) China Aerospace Science and Technology Corporation Satellite Application Research Institute Innovation Fund(No.2014-CXJJ-TX-11) 

主　　题：Satellite communication Physical layer security Cooperative relay system Artificial noise 

摘      要：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 *** 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 *** 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.