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2012 5th Global Symposium on Millimeter-Waves, GSMM 2012

作者： Chen, Wan Fu, Jiahui Hua, Jun Chen, Meiliang Dep. of Electronics and Communication Engineering Harbin Institute of Technology 92 Xidazhi St. Harbin China Science and Technology on Communication Information Security Control Laboratory 3288 Zhongshanxi St. Jiaxing Zhejiang Province China

ISBN: (纸本)9781467313032

In this paper, a novel approach is presented to calculate the lumped parameters of right/left-handed Structures. By this method, the equivalent circuit can be extracted, and the left/right handed features can be certified. Furthermore, the propagation constant of periodic structures can fit well with simulation and measurement. © 2012 IEEE.

关键词： Equivalent circuits

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A novel left-handed circularly polarized votage-controlled leaky wave antenna

A novel left-handed circularly polarized votage-controlled l...

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2012 5th Global Symposium on Millimeter-Waves, GSMM 2012

ISBN: (纸本)9781467313032

In this literature, a novel left-handed circularly polarized voltage-controlled leaky wave antenna is presented with a scanning range of 0° to -37° with a perfect axial ratio at the most time below 2 dB. The structure depends on CRLH (Composite Right/Left Handed) transmission line with a cross finger coupled line added, which gives additional performance on the farfield axial ratio. Also the principle of the structure is discussed and an equivalent circuit is presented for further study. © 2012 IEEE.

关键词： Equivalent circuits

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A study of EM scattering characteristics of complex conduct target based on the physical optics method of plane cell

A study of EM scattering characteristics of complex conduct ...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Wenhua Ye Huan Li Zhensen Wu Science Technology on Communication Iinformation Security Control Laboratory Jiaxing Zhejiang China No.36 Research Institute 0f CETC Jiaxing Zhejiang China School of Science Xidian University China

ISBN: (纸本)9781467317993

In this paper, the PO(physical optics) method is used to study the electromagnetic scattering properties of the complex electrically large conduct target. The target is modelled by software 3DS MAX and divided into triangle plane cells after imported into software FEKO, and then extract the point and plane information. The numerical results are in good agreement with results of FEKO by considering self and mutual shading of the target which illuminating the effectiveness of this method in calculating the complex electrically large conduct target.

关键词： Numerical models Electromagnetic scattering Physical optics Vectors Missiles Optical surface waves

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Poster abstract: Direct multi-hop time synchronization with constructive interference

Poster abstract: Direct multi-hop time synchronization with ...

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International Symposium on information Processing in Sensor Networks (IPSN)

作者： Yin Wang Gaofeng Pan Zhiyu Huang MOE Key Lab for Information System Security TNLIST Tsinghua University Science and technology on communication information security control laboratory Chinese Academy of Sciences

ISBN: (纸本)9781479964703

Multi-hop time synchronization in wireless sensor networks (WSNs) is often time-consuming and error-prone due to random time-stamp delays for MAC layer access and unstable clocks of intermediate nodes. Constructive interference (CI), a recently discovered physical layer phenomenon, allows multiple nodes transmit and forward an identical packet simultaneously. By leveraging CI, we propose direct multihop (DMH) time synchronization by directly utilizing the time-stamps from the sink node instead of intermediate n-odes, which avoids the error caused by the unstable clock of intermediate nodes. DMH doesn't need decode the flooding time synchronization beacons. Moreover, DMH explores the linear regression technique in CI based time synchronization to counterbalance the clock drifts due to clock skews.

关键词： Synchronization Clocks Protocols Accuracy Interference Wireless sensor networks Relays

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A design of Rotman lens for phase antenna array

A design of Rotman lens for phase antenna array

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Wan Chen Jiahui Fu Qun Wu Jun Hua Department of Electronics and Communication Engineering Harbin Institute of Technology Harbin Heilongjiang China Science and Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang China

In this work, a wide banded planar multi-input/output port Rotman lens for phase array antennas is investigated by simulation. The Rotman lens consists of lens and delay lines. With essential parameters, the outline of the lens is calculated by Matlab, in this way we can design a Rotman lens with certain functions, also the model is constructed by simulation software with the data imported from Matlab. The lens consists of the lens and the delay line. A useful segmented design of the delay line is applied to improve the transmission efficiency. A principle for dumpy port design is raised to improve the output characteristics. By this way, the magnitude error of different frequency is limited within 3 dB and below 5 dB when the port is changed. The lens offers a phase shift from -70 degree to +70 degree with a changeable step.

关键词： Lenses Arrays Delay lines Mathematical model Antenna arrays MATLAB Equations

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Identification of radio communication source with multi-object optimization

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Yingyong Kexue Xuebao/Journal of Applied sciences 2012年第6期30卷 559-565页

作者： Tang, Zhi-Ling Yang, Xiao-Niu Li, Jian-Dong School of Communication Engineering Xidian University Xi'an 710071 China School of Electronic Engineering and Automation Guilin University of Electronic Technology Guilin 541004 Guangxi Province China Science and Technology on Communication Information Security Control Laboratory Jiaxing 314033 Zhejiang Province China

To identify personality of a radio signal, a new method of multi-object optimization is proposed to solve a system of high order cumulants equations. The power amplifier model is first shown to be equivalent to a multi-input single-output system. A system of equations is derived from the cumulant relation between input and output. The system is solved with multi-object genetic optimization to obtain the features. The system of equations is verified by simulation, and the results of estimation are compared with computed values, showing that the proposed method can extract features from the received signal only with minor errors.

关键词： Radio communication

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A novel miniaturized band-pass frequency selective surface

A novel miniaturized band-pass frequency selective surface

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2012 5th Global Symposium on Millimeter-Waves, GSMM 2012

作者： Li, Wanlu Yang, Guohui Zhang, Tong Wu, Qun Hua, Jun Chen, Meiliang Gu, Xuemai School of Electronics and Information Technology Harbin Institute of Technology Harbin 150001 China Department of Microwave Engineering Key Laboratory No.92 West Dazhi Street Harbin 150001 China Fu Foundation School of Engineering and Applied Science Columbia University 116th Street and Broadway New York NY 10027 United States Science and Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang Province 314033 China

ISBN: (纸本)9781467313032

In this paper, a novel band-pass miniaturized FSS is proposed, in which a unit cell consists of four spiral etched slot lines arranged central-symmetrically on a dielectric substrate, and the spiral elements are placed interlaced so that each element is connected to an adjacent one in another unit cell. Simulation results show the FSS has the dimension of a unit cell only 0.060λx0.060λ, where λ represents the wavelength corresponding to the resonant frequency. And the miniaturization is stable with respect to different polarizations and incident angles. Prototype of the FSS is fabricated and tested. The measured results show very good agreement with simulated ones. © 2012 IEEE.

关键词： Frequency selective surfaces

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Chaos characteristics analysis about transient signals of FH radio with PLL synthesizer

Chaos characteristics analysis about transient signals of FH...

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International Conference on Multimedia and Signal Processing

作者： Song, Chunyun Science and Technology on Communication Information Security Control Laboratory Jiaxing China No.36 Research Institute of CETC Jiaxing China

ISBN: (纸本)9780769543567

Chaos characteristic analysis of the phase-locked loop (PLL) synthesizer has been made in this paper based on the phase model of it, and we conclude the state equation of this model and the condition when the system becomes chaos. Because the parameters of the PLL synthesizer will be changed when the FH radio switch the frequency, the system may turn to be chaos caused by the parameters of it meet the very condition. Some analysis about the transient signals of the frequency-hopping (FH) radio with PLL synthesizer is made in this paper. The fractal dimension of the transient signals is estimated by Cao's method, and the maximal Lyapunov exponent of these signals is positive. The unique double-ring attractor of them is also reproduced through the phase space reconstruction. All the result approve that the output of the FH radio is chaotic when the frequency changing. © 2011 IEEE.

关键词： Phase locked loops

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Novel Frequency Selective Surfaces with compact structure and ultra-wideband response

Novel Frequency Selective Surfaces with compact structure an...

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Wanlu Li Tong Zhang Guohui Yang Qun Wu Jun Hua School of Electronics and Information Engineering Harbin Institute of Technology Harbin China The Fu Foundation School of Engineering and Applied Science Columbia University New York USA Science and Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang Province China

A novel bandstop Frequency Selective Surface (FSS) is presented, in which a unit cell consists of two metallic of spiral strips of different lengths and a dielectric substrate in the middle. Both simulation and measurement are presented to show that the FSS can realize size reduction and ultra-wideband response. By changing the lengths of some outer strips the miniaturization amount and bandwidth can be adjusted. Moreover, all these responses are stable with respect to different incident angles, which make the proposed structure more valuable for practical application.

关键词： USA Councils Strips Horn antennas Ultra wideband technology Wireless LAN

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Bit Stream Oriented Enumeration Tree Pruning Algorithm

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Journal of Shanghai Jiaotong university(science) 2011年第5期16卷 567-570页

作者：邱卫东金凌杨小牛杨红娃 School of Information Security Engineering Shanghai Jiaotong University National Science and Technology on Communication Information Security Control Laboratory No. 36 Institute of China Electronics Technology Group Corporation

Packet analysis is very important in our digital life. But what protocol analyzers can do is limited because they can only process data in determined format. This paper puts forward a solution to decode raw data in an unknown format. It is certain that data can be cut into packets because there are usually characteristic bit sequences in packet headers. The key to solve the problem is how to find out those characteristic sequences. We present an efficient way of bit sequence enumeration. Both Aho-Corasick (AC) algorithm and data mining method are used to reduce the cost of the process.

关键词： pattern matching data mining frequent set frequent sequence association rule

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