基于CSI直接调制的物理层数据安全传输方案

Physical Layer Data Secure Transmission Based on Direct CSI Modulation Scheme

无线物理层安全技术是当前信息安全领域的一个研究热点,采用无线收发两端信道状态信息(Channel State Information,CSI)的互易性来生成对称的密钥,对传输数据进行加密。为了解决CSI量化过程中带来的安全性能损失,提出了一种基于CSI直接调制的物理层数据安全传输方案。该方案将从接收信号中获取的CSI信息直接调制在发送数据信号的星座图上,并对发送信号的星座图进行扰动,在接收端利用互易的CSI信息对接收信号的星座图进行反扰动,以实现数据的安全通信。采用两台通用软件无线电外设搭建实验环境,验证了方法的有效性。实验表明,在相同通信条件下,该方案可减少5%的误码率,更加适用于无线信道的数据安全传输。

Wireless physical layer security technology is a hot research spot in the field of information security.It uses the interoperability of CSI(Channel State Information)at the wireless receiving and sending ends to generate a symmetric key and encrypt the data to be transmitted.In order to solve the security performance loss caused during the CSI quantification process,this paper proposes a physical layer data security transmission scheme based on CSI direct modulation.In this scheme,the CSI information obtained from the received signal is directly modulated on the constellation diagram of the transmitted data signal,and the constellation diagram of the transmitted signal is perturbed,then at the receiving end,the constellation diagram of the received signal is inverse-erperturbed by using the reciprocal CSI information to realize the safe communication of the data.This paper uses two USRPs to build experimental environments to verify the effectiveness of the scheme.Experiments indicate that under the same communication conditions,the proposed scheme can reduce the code error rate by 5%,and is more suitable for secure data transmission in wireless channels.