电子学报 ›› 2016, Vol. 44 ›› Issue (2): 268-274.DOI: 10.3969/j.issn.0372-2112.2016.02.004

• 学术论文 • 上一篇    下一篇

基于混合信号的放大转发中继系统的物理层安全传输

杨斌, 王文杰, 殷勤业   

  1. 西安交通大学电子与信息工程学院, 陕西西安 710049
  • 收稿日期:2014-07-07 修回日期:2014-12-20 出版日期:2016-02-25
    • 作者简介:
    • 杨斌 男,1977年出生,西安交通大学电子与信息工程学院博士生,研究方向为物理层安全.E-mail:yabby_yb@hotmail.com;王文杰 男,1971年出生,西安交通大学电子与信息工程学院教授,研究方向为阵列信号处理,传感器网络,物理层安全.E-mail:wjwang@xjtu.edu.cn;殷勤业 男,1950年出生,西安交通大学电子与信息工程学院教授,研究方向为时空谱估计,阵列信号处理.
    • 基金资助:
    • 国家自然科学基金 (No.61172092)

Secure Wireless Communication for AF Relay System with Hybrid Signals

YANG Bin, WANG Wen-jie, YIN Qin-ye   

  1. School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
  • Received:2014-07-07 Revised:2014-12-20 Online:2016-02-25 Published:2016-02-25

摘要:

中继系统可以增强物理层安全算法的系统性能,这种系统一般包含两阶段的通信过程:从信源到中继节点,在从中继节点到目的节点.通常来说,第一阶段的信息传输缺乏保护,如果窃听者距离信源节点比较近的话,系统性能就无法保证了.该文提出了一种基于混合信号的三阶段的传输方法确保整个传输过程中的保密性能,这样,当窃听者接近信源节点的时候,仍可以保证系统的安全性能.这种方法的优化解是一个复杂的非凸优化问题,该文中建议了一种低复杂度的次优解来解决其中的优化问题.理论分析以及方针结果证明,该方法可以有效确保系统的全过程的安全性能.

关键词: 无线通信, 物理层安全, 中继通信

Abstract:

Relay system can improve the secrecy of a wireless communication with physical layer security algorithms.Most of these algorithms include two stages:during the first stage, the source node sends coded messages to the relays, and during the second stage, the relays forward the received messages to the destination node.Usually, there is no protection during the first stage, thus most of the secrecy analysis is based on the assumption that there is no direct channel between the source and the eavesdropper.In a practical system, when the eavesdropper is located near the source, the secrecy rate of all these algorithms is down to zero.In this paper, a novel three-stage algorithm with hybrid signals is proposed, which can offer full protection on a relay system.The algorithm results in a non-convex optimal problem, and a sub-optimal solution with low computational complexity is proposed.The theoretical analysis and simulation results show that the proposed scheme can achieve much better secrecy performance than traditional algorithms when the eavesdropper is near the source node.

Key words: wireless communication, physical layer security, relay network

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