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工程科学与技术:2016,48(3):142-147
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采用4-WFRFT和人工噪声的变换域通信物理层安全传输
(空军工程大学)
Secure Transmission for TDCS Using 4-WFRFT and Noise Insertion
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投稿时间:2015-06-27    修订日期:2016-02-18
中文摘要: 为了提高变换域通信(TDCS)信号的物理层安全性,提出了一种基于4项加权分数阶傅里叶变换(4-WFRFT)和人工噪声的TDCS信号加密方式。首先利用4-WFRFT代替传统TDCS中的DFT/IDFT,改变了TDCS信号的空间分布,在保持原系统复杂度的同时增加了TDCS信号的抗截获性,在此基础上使用人工噪声进一步增强系统的安全性,最后推导了非法用户理论误码率以及系统保密容量。仿真结果表明,无论是全频谱或是频谱失配情况下,采用当参数 在[0,0.8)或(1.7,4]的范围内时,窃听者误码率始终保持在0.5,无法正确解调发送信号,同时系统保密容量也为正数,有效保证了信息的安全传输。
Abstract:In order to guarantee the physical layer security of the transform domain communication system (TDCS), a security-enhanced scheme based on 4-Weighted-type Fractional Fourier Transform (4-WFRFT) and artificial noise insertion was proposed. Firstly, the 4-WFRFT was applied to TDCS instead of the Discrete Fourier Transform (DFT) and Inverse Discrete Fourier Transform (IDFT), which maintained the system complexity while made the distribution of TDCS signals change in the complex plane. And then the artificial noise is inserted to further enhance the security. The expression of the Bit Error Rate(BER) and the security capacity for eavesdroppper were obtained. Simulation results show that whether with or without spectrum mismatch, the BER for eavesdropper kept 0.5 and the security capacity is positive when in the range of [0, 0.8) or (1.7, 4] in the security-enhanced TDCS. It provides a promising solution to extend the application of TDCS scheme where secure communication is required.
文章编号:201500624     中图分类号:    文献标志码:
基金项目:“Ka频段宽带自适应卫星通信关键技术研究”(61271250)
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WangShu  xss_wang@163.com 
   
   
   
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引用文本:
王舒,达新宇,褚振勇,朱丽莉.采用4-WFRFT和人工噪声的变换域通信物理层安全传输[J].工程科学与技术,2016,48(3):142-147.
WangShu.Secure Transmission for TDCS Using 4-WFRFT and Noise Insertion[J].Advanced Engineering Sciences,2016,48(3):142-147.