协作通信系统中安全高效的空时网络编码技术研究

项目名称： 协作通信系统中安全高效的空时网络编码技术研究

项目编号： No.61302067

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 高贞贞

作者单位： 西安交通大学

项目金额： 25万元

中文摘要： 由于无线信道的开放性，协作通信系统不仅受到衰落和干扰的影响，还面临着严峻的安全性挑战。因此，研究兼顾系统可靠性、有效性和安全性的协作传输技术具有重要的意义。本课题从空时网络编码的设计入手，研究如何提高系统的传输效率及传输安全性。具体内容包括：1、在不降低协作传输效率的前提下，基于网络编码的思想设计适合异步传输的满分集空时网络编码方案；2、在可靠性的前提下，设计基于空时网络编码的传输协议，模仿全双工传输，提高传输效率；3、在可靠性及不降低传输效率的前提下，利用物理信道设计抗窃听空时网络编码方案，使窃听节点受到人为随机干扰而性能恶化。在完成上述方案设计的基础上，从可靠性、有效性和安全性的折中角度对所提方案的性能进行分析和评估，并讨论信道估计误差等不理想因素对系统性能的影响。本课题对国内协作通信领域的研究在国际上保持领先地位具有积极的意义，并为协作通信技术的实际运用提供有益的参考方案。

中文关键词： 物理层安全；空时编码；空间调制；人工噪声；协作通信

英文摘要： Due to the broadcast nature of wireless medium, cooperative communication systems are not only influenced by fading and interference, but also challenged by security issues. Therefore, it is important to design cooperative transmission schemes which take transmission reliability, efficiency as well as security into consideration. In this proposal, the system performance is improved by the design of space-time network coding, which can improve transmission efficiency and provide security. The proposal includes: 1) based on the idea of network coding, designing full diversity space-time network coding schemes for asynchronous cooperative communications without sacrificing transmission efficiency. 2) under the constraint of reliability, designing space-time network coded protocols to improve transmission efficiency and mimic full-duplex transmissions. 3) under the constraint of transmission reliability and efficiency, designing anti-eavesdropping space-time network coding schemes by exploiting physical channels, which can degrade the eavesdropper's performance by introducing artificial random interference. The performances of the proposed schemes are analyzed and evaluated from the perspective of reliability-efficiency-security tradeoff. The influences of some practical factors such as channel estimation errors are

英文关键词： Physical Layer Security；Space-Time Coding；Spatial Modulation；Artificial Noise；Cooperative Communications