基于全双工信源的噪声辅助安全信道
Artificial-Noise-Aided Secure Channel with a Full-duplex Source
摘要：
本文考虑了一种新的安全通信场景，其中全双工发送者（Alan）需要向半双工接收者（Bob）发送机密信息，而沉默的窃听者（Eve）试图窃听机密信息。为了实现Alan和Bob之间的保密通信，提出了一种新的两阶段通信方案：在第一阶段，Alan和Bob同时发送人工噪声（AN）;在第二阶段，Alan将第一阶段接收到的AN与自己的保密信号叠加后发送给Bob。由于混合AN可以降低Eve的SINR（信号与干扰和噪声比），但不影响Bob的SINR，因此可以实现保密容量。我们还推导了该方案的保密容量存在的条件，并分析了在瑞利衰落信道下的保密中断概率。数值结果表明，该方案的保密容量约为无AN时的2倍，而中断概率约为无AN时的5倍。
英文摘要：
This paper consider a new secure communication scene where a full-duplex transmitter (Alan) need to transmit confidential information to a half-duplex receiver (Bob), with a silent eavesdropper (Eve) that tries to eavesdrop the confidential information. For realizing secure communication between Alan and Bob, a novel two phases communication scheme is proposed: in Phase 1, Alan and Bob send artificial noises (AN) simultaneously, while in Phase 2, Alan superimposes the AN received in Phase 1 with its confidential signal and sends the mixed signalto Bob. Since the mixed AN could degrade the SINR (Signal to Interference and Noise Ratio) of Eve, but does not affect the SINR of Bob, a secrecy capacity can be achieved. We also derive the conditions that the secrecy capacity of the proposed scheme exists, and analyze the secrecy outage probability under Rayleigh fading channel. Numerical results show that the secrecy capacity is about two times higher than without AN, even though in the proposed scheme half of the time is used to transmit ANs, and the outage probability is about five times lower than that without AN.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
