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Particle filtering based channel estimation in OFDM power line communication

The Journal of China Universities of Posts and Telecommunications 2014年第5期21卷 24-30,42页

作者： ZHANG Pei-ling ZHANG Hong-xin LIU Hong-da ZHANG Yu-jing HE Peng-fei PANG Xue-li School of Telecommunication Engineering Beijing University of Posts and Telecommunications School of Electrical Engineering and Automation Henan Polytechnic University Beijing Key Laboratory of Work Safety Intelligent Monitoring Beijing University of Posts and Telecommunications School of Opto-electronic Information Science and Technology Yantai University Nanyang Information Engineering School

Particle filtering （PF） algorithm has the powerful potential for coping with difficult non-linear and non-Gaussian problems. Aiming at non-linear, non-Gaussian and time-varying characteristics of power line channel, a time-varying channel estimation scheme combined PF algorithm with decision feedback method is proposed. In the proposed scheme, firstly the indoor power line channel is measured using the pseudo-noise （PN） correlation method, and a first-order dynamic autoregressive （AR） model is set up to describe the measured channel, then, the channel states are estimated dynamically from the received signals by exploiting the proposed scheme. Meanwhile, due to the complex noise distribution of power line channel, the performance of channel estimation based on the proposed scheme under the Middleton class A impulsive noise environment is analyzed. Comparisons are made with the channel estimation scheme respectively based on least square （LS）, Kalman filtering （KF） and the proposed algorithm. Simulation indicates that PF algorithm dealing with this power line channel estimation difficult non-linear and non-Gaussian problems performance is superior to those of LS and KF respectively, so the proposed scheme achieves higher estimation accuracy. Therefore, it is confirmed that PF algorithm has its own unique advantage for power line channel estimation.

关键词： power line communication (PLC) orthogonal frequency division multiplexing (OFDM) channel estimation PF KF

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Design and analysis of a structure-based microstrip bandpass filter

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The Journal of China Universities of Posts and Telecommunications 2014年第4期21卷 64-67,95页

作者： YUAN Dong-ming ZHAO Shu-wen ZHANG Hong-xin HE Peng-fei School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing Key Laboratory of Work Safety Intelligent Monitoring Beijing University of Posts and Telecommunications

A structure-based microstrip passband filter with the center frequency of 2.6 GHz was put forward by using double-mode resonator based on defected ground structure （DGS） technology. A double-mode coupling resonator combined with DGS structure was used to achieve the resonance frequency and the filter size. CST microwave studio was used to optimize the attenuation performance to get the filter parameters. A structure-based passband filter was fabricated. Simulation is consistent with the measurement. Performance shows that the proposed filter could be suitable for the time division-long term devolution （TD-LTE） microwave systems at 2.6 GHz.

关键词： passband filter double-mode resonator DGS structure

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Electromagnetic side-channel attack based on PSO directed acyclic graph SVM

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The Journal of China Universities of Posts and Telecommunications 2015年第5期22卷 10-15页

作者： Li Duan Zhang Hongxin Li Qiang Zhao Xinjie He Pengfei School of Electronic Engineering Beijing University of Posts and Telecommunications School of Electrical Engineering and Automation Henan Polytechnic University Institute of North Electronic Equipment School of Opto-electronic Information Science and Technology Yantai University

Machine learning has a powerful potential for performing the template attack(TA) of cryptographic device. To improve the accuracy and time consuming of electromagnetic template attack(ETA), a multi-class directed acyclic graph support vector machine(DAGSVM) method is proposed to predict the Hamming weight of the key. The method needs to generate K(K ? 1)/2 binary support vector machine(SVM) classifiers and realizes the K-class prediction using a rooted binary directed acyclic graph(DAG) testing model. Further, particle swarm optimization(PSO) is used for optimal selection of DAGSVM model parameters to improve the performance of DAGSVM. By exploiting the electromagnetic emanations captured while a chip was implementing the RC4 algorithm in software, the computation complexity and performance of several multi-class machine learning methods, such as DAGSVM, one-versus-one(OVO)SVM, one-versus-all(OVA)SVM, Probabilistic neural networks(PNN), K-means clustering and fuzzy neural network(FNN) are investigated. In the same scenario, the highest classification accuracy of Hamming weight for the key reached 100%, 95.33%, 85%, 74%, 49.67% and 38% for DAGSVM, OVOSVM, OVASVM, PNN, K-means and FNN, respectively. The experiment results demonstrate the proposed model performs higher predictive accuracy and faster convergence speed.

关键词： directed acyclic graph support vector machine(DAGS

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Dual-band-stop filters with unsymmetrical T-shape DGS resonators

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The Journal of China Universities of Posts and Telecommunications 2013年第4期20卷 112-115页

作者： ZHANG Jin-ling ZHANG Hong-xin LU Ying-hua ZHANG Li-kun School of Telecommunication Engineering Beijing University of Posts and Telecommunications Translation Department

A kind of dual-band-stop filter with an unsymmetrical T-shape defected ground structure （DGS） is proposed. The filter has two band gap centers at 4.9 GHz and 7.35 GHz, respectively, where the two centre frequencies are just the second and third harmonics 2.45 GHz. The filters with high band-stop performance and wideband spurious suppression can be achieved by cascading miniaturized unsymmetrical T-shape DGS. The attenuation of three-cascaded T-shape DGS filter is 30.77 dB at 4.9 GHz and 17.96 dB at 7.35 GHz respectively. The above experimental results are in good agreement with the simulation results, especially for the third harmonic.

关键词： DGS band-stop filter dual-resonant characteristics unsymmetrical T-shape

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A PHEMT Based Wideband LNA for Wireless Applications

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China Communications 2015年第10期12卷 108-116页

作者： Muhammad Saad Khan ZHANG Hongxin HE Pengfei Sulman Shahzad Rahat Ullah School of Electronic Engineering Beijing University of Posts and Telecommunications(BUPT) Electrical Engineering Department University College of Engineering & TechnologyBahauddin Zakariya University Institute of Science and Technology for Opto-electronic Information Yantai University State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

This work is about the development of a super low noise amplifier with minimum power consumption and high gain for several wireless *** amplifier operates at frequency bands of 0.9-2.4 GHz and can be used in many applications like Wireless local area network(WLAN),WiFi,Bluetooth,ZigBee and Global System for mobile communications(GSM).This new design can be employed for the IEEE 802.15.4 standard in industrial,scientific and medical(ISM) *** enhancement mode pseudomorphic high electron mobility transistor PHEMT is used here due to its high linearity,better performance and less noisy *** common source inductive degeneration method is employed here to enhance the gain of *** amplifier produces a gain of more than 17 dB and noise figure of about 0.5 *** lower values of S11 and S22 reflect the accuracy of impedance matching network placed at the input and output sides of *** Advance Design System(ADS) is used for the design and simulation *** the layout of design is developed on the FR4 substrate.

关键词： low noise amplifier phemt advanced design system wireless local area network global positioning system

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Tri-band bandpass filter based on coupled stepped impedance resonators

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The Journal of China Universities of Posts and Telecommunications 2015年第6期22卷 57-60页

作者： Zhang Xudong Zhang Hongxin He Pengfei School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing Key Laboratory of Work Safety Intelligent Monitoring Beijing University of Posts and Telecommunications School of Opto-Electronic Information Science and Technology Yantai University

A novel tri-band bandpass filter （BPF） is proposed by using cross-coupled stepped impedance resonators （SIRs）, which can operate at 2.4 GHz, 3.5 GHz and 5.25 GHz respectively. In engineering application, it is suitable for wireless local area network （WLAN） and worldwide interoperability for microwave access （WiMAX）. In addition, the passband of this filter can be easily controlled by changing the electrical parameters of the resonators. So it is helpful to the selection of passband in engineering applications. For in-depth analysis, the equivalent circuit of the filter is also proposed. At last, it shows that the measured results agree well with the simulated results. The insertion loss of the filter within each passband is less than 1.9 dB, meanwhile two transmission zeros are obtained which can be able to meet the engineering requirements.

关键词： tri-band bandpass filter microstrip stepped impedance resonator cross-coupled

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电磁泄露信息的采集与预处理

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电波科学学报 2015年第5期30卷 1004-1008页

作者：甘罕张洪欣张帆赵新杰贺鹏飞北京邮电大学电子工程学院北京100876 安全生产智能监控北京市重点实验室(北京邮电大学) 北京100876 浙江大学信息与电子工程学院杭州310027 北方电子设备研究所北京100191 烟台大学光电信息技术学院烟台264005

在对电磁差分能量分析攻击的研究中,电磁泄露曲线的对齐处理是攻击成功的关键.在迹线对齐处理时,以相位相关性为基础进行了改进,采用泰勒级数展开的方法得到了迹线的偏移量.针对对齐后的数据进行了极大值提取,实现了电磁泄露曲线的降维... 详细信息

在对电磁差分能量分析攻击的研究中,电磁泄露曲线的对齐处理是攻击成功的关键.在迹线对齐处理时,以相位相关性为基础进行了改进,采用泰勒级数展开的方法得到了迹线的偏移量.针对对齐后的数据进行了极大值提取,实现了电磁泄露曲线的降维处理,降低了攻击的复杂度.提出了一种采用欧式距离对对齐效果进行分析的判据.试验结果表明,在一定维数范围内未对齐的欧式距离波动程度较大,而对齐后的欧式距离波动较小.可通过判断欧式距离的波动程度确定曲线是否对齐.

关键词：泰勒级数差分能量分析相位相关性欧式距离

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基于回声状态网络的功耗曲线特征提取

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电波科学学报 2014年第6期29卷 1127-1132页

作者：李静张洪欣甘罕石松贺鹏飞北京邮电大学电子工程学院北京100876 中国信息安全测评中心北京100085 安全生产智能监控北京市重点实验室(北京邮电大学) 北京100876 山东省烟台大学光电信息技术学院山东烟台264005

在模板(Template Attacks,TA)攻击的研究中,如何利用功耗曲线信息,合理选择有效点,增强匹配效果是改进模板攻击的一个重要方向.文中分析了目前有关功耗曲线主要特征提取方法的优缺点,并提出了一种基于回声状态网络(Echo State Network,E... 详细信息

在模板(Template Attacks,TA)攻击的研究中,如何利用功耗曲线信息,合理选择有效点,增强匹配效果是改进模板攻击的一个重要方向.文中分析了目前有关功耗曲线主要特征提取方法的优缺点,并提出了一种基于回声状态网络(Echo State Network,ESN)的功耗曲线特征提取方法.该方法针对ESN分类方法中的储备池参数选择问题,以时间预测序列精度为标准,采用网格法进行参数空间的优化搜索,并利用神经网络以数据样本形式作为定量知识自行处理的能力,对粗略对齐下的功耗曲线的特征提取能力进行了测试和评估.实验结果表明,基于ESN功耗曲线特征提取方法在功耗曲线数量相同条件下,通过合理选择内核参数,能够降低模板攻击对功耗曲线预处理技术的依赖,提高正确密钥的分类精度.

关键词：回声状态网络有效点选取模板攻击 LED

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基于能耗旁路泄露的密码芯片模板攻击算法研究

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电波科学学报 2015年第5期30卷 987-992页

作者：张洪欣李静张帆甘罕贺鹏飞北京邮电大学电子工程学院北京100876 安全生产智能监控北京市重点实验室(北京邮电大学) 北京100876 中国信息安全测评中心北京100085 浙江大学信息与电子工程学院杭州310027 山东省烟台大学光电信息技术学院烟台264005

为解决模板攻击对先验知识要求较为苛刻的问题,基于聚类的半监督式模板攻击方法,研究了能耗泄露曲线特征点的选择,提出了基于皮尔逊相关系数和主成分分析(Principal Component Analysis,PCA)方法对旁路泄露进行特征提取的方法.在聚类过... 详细信息

为解决模板攻击对先验知识要求较为苛刻的问题,基于聚类的半监督式模板攻击方法,研究了能耗泄露曲线特征点的选择,提出了基于皮尔逊相关系数和主成分分析(Principal Component Analysis,PCA)方法对旁路泄露进行特征提取的方法.在聚类过程中,通过少量的有标号的信息来辅助并引导聚类过程对无标号数据的聚类处理,放宽了模板攻击的假设条件.以轻量级分组密码(Light Encryption Device,LED)算法旁路泄露为例,通过实验研究了特征选取等因素对密钥恢复的影响,并分析了能量迹中的数据依赖性.研究结果表明:与常规半监督式模板攻击方法相比,所采用的特征提取方法可以有效降低异常数据和噪声的干扰,提高先验信息的利用率及密钥恢复成功率.

关键词：密码芯片旁路泄露特征提取系统安全

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基于缺陷地结构的小型化双频带带通滤波器

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电波科学学报 2016年第2期31卷 363-367页

作者：张洪欣张旭东贺鹏飞北京邮电大学电子工程学院北京100876 安全生产智能监控北京市重点实验室(北京邮电大学) 北京100876 烟台大学光电信息技术学院烟台264005

提出了一种新型的基于缺陷地结构的双频带带通微带滤波器.缺陷地结构采用双模开口谐振环形式,并使用不同组合方式的双模开口谐振环产生两个通带.滤波器的两个工作中心频率分别为3.5GHz和5.8GHz,其中第一个频带涵盖了所有全球微波互联接... 详细信息

提出了一种新型的基于缺陷地结构的双频带带通微带滤波器.缺陷地结构采用双模开口谐振环形式,并使用不同组合方式的双模开口谐振环产生两个通带.滤波器的两个工作中心频率分别为3.5GHz和5.8GHz,其中第一个频带涵盖了所有全球微波互联接入的应用频段,第二个频带可以应用于雷达设备.为了进一步证实这款滤波器的性能,基于Roggers RT5880板材制作了滤波器实物,整体滤波器的大小仅为20mm×20mm,测量数据和仿真结果吻合较好,并且有两个传输零点,可以满足工程上的需要.

关键词：缺陷地结构小型化双模开口谐振环微带带通滤波器

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