保障中继网络安全性的低复杂度协作传输技术研究

项目名称： 保障中继网络安全性的低复杂度协作传输技术研究

项目编号： No.61201207

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电子学与信息系统

项目作者： 孙黎

作者单位： 西安交通大学

项目金额： 28万元

中文摘要： 协作中继是未来无线网络的关键技术之一，对优化网络性能具有重要作用。传统的物理层协作中继方案主要着眼于如何提升链路可靠性与传输速率。然而，由于无线信道的开放性，中继网络在安全方面还面临严峻挑战。因此，将网络安全性融入协作协议的设计，研究兼顾有效性、可靠性与安全性的协作传输技术具有重要意义。本课题拟基于物理层安全的视角对无线中继网络进行深入分析，针对窃听者为外部节点和内部节点等两种场景设计保障安全性的低复杂度传输方案。具体的研究内容包括：（1）有效对抗窃听的节点协作策略；（2）增强链路安全性的中继选择策略；（3）安全性约束下的资源分配策略。在完成上述策略设计的基础上，将从信息论的角度对系统性能进行分析和评估，并讨论关键系统参数与系统性能的关系。本项目的研究有助于揭示安全性限制对无线中继网络物理层性能的影响，将为协作中继技术的广泛应用提供重要的理论基础与有益的参考方案。

中文关键词： 协作中继通信；物理层安全；信号设计；喷泉码；中继选择

英文摘要： Cooperative relaying, which is considered as one of the key technologies for future wireless networks, plays an important role in optimizing the network performance. Traditional physical layer (PHY) cooperative relaying stratigies mainly focus on the improvement of the link reliablility and the transmission rate. However, due to the openess of wireless channels, relay networks also face tough security challenges. Therefore, it is of vital significance to integrate the security considerations into the cooperative protocol design and develop the transmission techniques to guarantee the security in addition to the reliability and efficiency. To this end, we intend to do a deep study in wireless relay networks from the PHY-security perspective. Two representative scenarios, i.e., the relay networks with external eavesdroppers and that with internal eavesdroppers, are addressed, and some low-complexity transmission schems with security guarantee are investigated. To be specific, our research includes three parts: (1) the anti-eavesdropping node cooperation schemes; (2) the relay selection schemes with security enhancement; (3) the resource allocation schemes under security constraints. Based on the developed schemes, the system performance will be analyzed and evaluated from the information theoretical point of view.

英文关键词： Cooperative Relaying Communications；Physical Layer Security；Signal Design；Fountain Codes；Relay Selection