This paper studies a convincingly secure transmission framework under an allowable outage probability for practical finite-alphabet inputs, where a full-duplex receiver (Bob) is taken into account to emit the artificial noise for deteriorating the eavesdropper’s decoding performance. We develop a secure-reliable mechanism to take the place of prior secrecy rate (SR) maximization strategy, where a closed form expression is invoked for substituting the non-closed SR expression upon exploiting the multi-exponential decay fitting approach. Hence, the intractable expectation operation over a large number of noise samples is circumvented. Moreover, a pair of critical probabilities of the reliable transmission and secure outage are first analyzed, and then a low-complexity optimization scheme is formulated. Apart from designing the transmission scheme for classically secure networks consisting of a transmitter, Bob and an eavesdropper, we further carry out an investigation on conceiving a secure-reliable strategy against multiple Eves for improving the system’s extensibility. To this end, analytical expressions of both the reliability outage and secrecy outage probabilities for multiple-Eve scenarios are also derived. Furthermore, a pragmatic iterative solution is conceived for addressing the corresponding max-min optimization problem. Finally, the simulation results validate the significance of our considered secure-reliable transmission in terms of the average SR performance attained.

中文翻译：

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具有有限字母输入的全双工接收器的安全可靠传输设计


本文研究了一种在实际有限字母输入的允许中断概率下的令人信服的安全传输框架，其中考虑全双工接收器（Bob）发出人工噪声以恶化窃听者的解码性能。我们开发了一种安全可靠的机制来取代先前的保密率（SR）最大化策略，其中在利用多指数衰减拟合方法时调用闭合形式表达式来替换非闭合SR表达式。因此，避免了对大量噪声样本的棘手期望操作。此外，首先分析了可靠传输和安全中断的一对临界概率，然后制定了低复杂度的优化方案。除了设计由发送器、鲍勃和窃听器组成的经典安全网络的传输方案之外，我们还进一步研究了针对多个 Eve 的安全可靠策略，以提高系统的可扩展性。为此，还导出了多Eve场景的可靠性中断和保密中断概率的解析表达式。此外，还构思了一种实用的迭代解决方案来解决相应的最大-最小优化问题。最后，仿真结果验证了我们考虑的安全可靠传输在获得的平均 SR 性能方面的重要性。