This paper presents a design scheme of wire-line telephone system using self-interference(SI)cancellation technology in co-frequency co-time full-duplex(CCFD)system to realize absolute secure communication at the phys...This paper presents a design scheme of wire-line telephone system using self-interference(SI)cancellation technology in co-frequency co-time full-duplex(CCFD)system to realize absolute secure communication at the physical layer.This scheme can hide the target signal by skillfully releasing the high-power artificial noise to the whole link at the receiving node,and then make use of the receiver’s knowledge of the SI signal to achieve high dB SI cancellation with the help of analog domain SI cancellation technology in CCFD domain,so that the signal-to-noise ratio(SNR)received by the eavesdropper at any position of the link is far lower than that of the legitimate receiver,so as to realize the absolutely secure communication in the sense of Wyner principle.This paper not only puts forward the specific design scheme of absolutely secure communication telephone,but also analyzes the calculation of security capacity under different eavesdropping positions,different SI cancellation capability and different system parameters according to Shannon theory.展开更多
架空接触线的位置是否合理直接影响受电弓-接触线的接触工况,关系到受流稳定、磨耗以及列车供电与行驶安全,需要定期对其进行测量与调整。为了进一步提高柔性架空接触线识别方法的准确性,提出了一种基于线激光扫描技术的接触线测量方法...架空接触线的位置是否合理直接影响受电弓-接触线的接触工况,关系到受流稳定、磨耗以及列车供电与行驶安全,需要定期对其进行测量与调整。为了进一步提高柔性架空接触线识别方法的准确性,提出了一种基于线激光扫描技术的接触线测量方法,用于获取接触线的导高、拉出值、磨耗深度。该方法利用面阵相机采集线激光在接触线表面的反射光斑图像并进行位置解算,然而吊弦等附属装置会导致图像中容易夹杂异常光斑干扰目标提取,导致测量数据失真。为了解决该问题,提出鲸鱼算法优化支持向量机算法(whales optimization algorithm and support vector machine,WOA-SVM)对线激光图像进行识别与粗定位,以锁定正常的接触线光斑区域,实现对架空接触线的位置测量。实验证明,WOA-SVM算法在接触线连通域识别中具有高可靠性,其准确度为99.86%,特异性为95.65%,可有效抑制异常光斑干扰,满足实际工程应用需求。展开更多
基金Supported by the Natural Science Foundation of Hubei Province(2019CFB593)the National Natural Science Foundation of China(61961016)+1 种基金Ph.D.Research Start-up Foundation of Hubei Minzu University(MY2018B08)Graduate Education Innovation Plan of Hubei Minzu University(DC2000000119)。
文摘This paper presents a design scheme of wire-line telephone system using self-interference(SI)cancellation technology in co-frequency co-time full-duplex(CCFD)system to realize absolute secure communication at the physical layer.This scheme can hide the target signal by skillfully releasing the high-power artificial noise to the whole link at the receiving node,and then make use of the receiver’s knowledge of the SI signal to achieve high dB SI cancellation with the help of analog domain SI cancellation technology in CCFD domain,so that the signal-to-noise ratio(SNR)received by the eavesdropper at any position of the link is far lower than that of the legitimate receiver,so as to realize the absolutely secure communication in the sense of Wyner principle.This paper not only puts forward the specific design scheme of absolutely secure communication telephone,but also analyzes the calculation of security capacity under different eavesdropping positions,different SI cancellation capability and different system parameters according to Shannon theory.
文摘架空接触线的位置是否合理直接影响受电弓-接触线的接触工况,关系到受流稳定、磨耗以及列车供电与行驶安全,需要定期对其进行测量与调整。为了进一步提高柔性架空接触线识别方法的准确性,提出了一种基于线激光扫描技术的接触线测量方法,用于获取接触线的导高、拉出值、磨耗深度。该方法利用面阵相机采集线激光在接触线表面的反射光斑图像并进行位置解算,然而吊弦等附属装置会导致图像中容易夹杂异常光斑干扰目标提取,导致测量数据失真。为了解决该问题,提出鲸鱼算法优化支持向量机算法(whales optimization algorithm and support vector machine,WOA-SVM)对线激光图像进行识别与粗定位,以锁定正常的接触线光斑区域,实现对架空接触线的位置测量。实验证明,WOA-SVM算法在接触线连通域识别中具有高可靠性,其准确度为99.86%,特异性为95.65%,可有效抑制异常光斑干扰,满足实际工程应用需求。
