Abstract

Physical layer security (PLS), which is based on information-theoretic principles of message confidentiality, has attracted considerable attention in recent years. This paper provides a comprehensive survey of using channel feedback (CF) to enhance the quality of PLS of various communication models. To be specific, the survey starts from the secret key-based CF scheme and its variations for the wiretap channel (WTC) and other communication models. Then, for the WTC and its generalized models, an improved feedback scheme and its variations are respectively introduced, where the improved scheme combines the secret key-based CF scheme with the Wyner-Ziv scheme for source coding with side information. It has been shown that these improved schemes perform better than the original secret key-based schemes for several cases. Next, the Schalkwijk-Kailath (SK) feedback scheme and its variations are introduced, which are optimal for the Gaussian WTC and its variations. Finally, the already existing CF schemes are summarized and the future challenges of using CF to enhance PLS are discussed.

中文翻译：

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通过渠道反馈提高物理层安全性：一项调查

摘要

基于消息机密性的信息理论原理的物理层安全性（PLS）近年来引起了相当大的关注。本文对使用信道反馈（CF）来增强各种通信模型的PLS的质量进行了全面的调查。具体而言，调查从基于秘密密钥的CF方案及其对窃听通道（WTC）和其他通信模型的变化开始。然后，对于WTC及其广义模型，分别介绍了一种改进的反馈方案及其变体，其中，该改进方案将基于秘密密钥的CF方案与Wyner-Ziv方案相结合，用于带有辅助信息的源编码。已经表明，在某些情况下，这些改进的方案比基于原始密钥的方案具有更好的性能。下一个，介绍了Schalkwijk-Kailath（SK）反馈方案及其变体，这对于高斯WTC及其变体是最佳的。最后，总结了已经存在的CF方案，并讨论了使用CF增强PLS的未来挑战。