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International Journal of Control and Automation 2014年第12期7卷 239-246页

作者： Shen, Jian Tan, Haowen Wang, Yang Ji, Sai Wang, Jin Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing China Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing China School of Computer and Software Nanjing University of Information Science and Technology Nanjing China

RFID authentication on large numbers of tags or tag groups has attracted many researchers' attention as an extension of initial one-or-two-tags scenarios. Due to demands of RFID application in supply chain, various proofs are proposed in the purpose of solving existing problems of grouping tags identification. However, it is proved that verifiers in these proofs are not aware of abnormal relating devices instantly, which may cause both security and technical risks and lie heavy upon identification of the problematic tags and readers. In this paper, we propose an enhanced grouping proof for multiple RFID readers and tag groups, according to which the verifier is able to cope with multiple readers and tag groups simultaneously and know the detailed status of the problematic tags. In addition, privacy protection is provided by offering mutual authentication between the readers and tags. Moreover, it is hard for the malicious tags to pass the verification in the proposed proof. © 2014 SERSC.

关键词： Supply chains

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Homotopic mapping solitary traveling wave solutions for the disturbed BKK mechanism physical model

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Chinese Physics B 2014年第9期23卷 54-59页

作者：周先春石兰芳韩祥临莫嘉琪 College of Electronic and Information Engineering Nanjing University of Information Science and Technology Jiangsu Technology and Engineering Center for Meteorological Sensor Network Nanjing University of Information Science and Technology Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science and Technology College of Mathematics and Statistics Nanjing University of information Science and Technology Department of Mathematics Huzhou Teachers College Department of Mathematics Anhui Normal University

Using the trial equation method, a Broer-Kau-Kupershmidt （BKK） mechanism physical model is obtained, and the exact and approximate solitary traveling wave solutions are found. As an example, it is pointed out that t... 详细信息

关键词： nonlinear solitary traveling wave

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Compact and Tunable Mid-IR Light Source Based on a Dual-Wavelength Fiber Laser

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Chinese Physics Letters 2013年第11期30卷 106-108页

作者： CHANG Jian-Hua WANG Ting-Ting ZHANG Chuang GE Yi-Xian TAO Zai-Hong Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science&TechnologyNanjing 210044 Jiangsu Technology&Engineering Center of Meteorological Sensor Network Nanjing University of Information Science&TechnologyNanjing 210044

A compact,tunable mid-IR difference-frequency generation(DFG)light source based on a dual-wavelength fiber laser and a 5mol%MgO-doped periodically poled lithium niobate(MgO:PPLN)crystal is developed and *** output power of 233μW is achieved with a conversion efficiency of 0.1%/*** mid-IR wavelength can be tuned between 3308 nm and 3314 nm by changing the temperature of a pair of fiber Bragg grating(FBG)taking as cavity mirrors in the dual-wavelength fiber laser from 26.5°C to 106.5°C.

关键词： fiber tunable Dual

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Internal and external optical feedback effect in fiber linear lasers

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Journal of networks 2013年第9期8卷 1990-1996页

作者： Zhou, Junping Xia, Jingming Ge, Yixian Chernoff, Eric Jiangsu Key Laboratory of Meteorological Observation and Information Processing Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing China Hangzhou International School Hangzhou China

In this paper, models of internal and external optical feedback effect in fiber linear lasers have been presented. The effects of optical feedback could be equivalent to the variation of laser cavity loss, and the output expressions of two models are deduced. According to the simulation results, the optical feedback system in fiber linear lasers has the same phase sensitivity as the traditional self-mixing effect in semiconductor lasers. The experimental results show a good agreement with the simulated results. Comparing the output of internal structure with that of external structure, we can conclude that the internal optical feedback system can get higher output gain and stripe depth, which reveals that the internal feedback structure has better sensing characteristics. © 2013 ACADEMY PUBLISHER.

关键词： Fiber lasers

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Sparsity-Based Direct Location Estimation Based on Two-step Dictionary Learning

Sparsity-Based Direct Location Estimation Based on Two-step ...

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The 9th International Conference on Wireless Communications,networking and Mobile Computing(WICOM 2013)

作者： Tingting Wang Wei Ke Gang Liu The Jiangsu Engineering Center of Meteorological Sensor Network Technology Nanjing University of Information Science and Technology The Jiangsu Key Laboratory on Optoelectronic Technology School of Physics and TechnologyNanjing Norm University Key Laboratory of Disaster Reduction and Emergency Response Engineering of the Ministry of Civil Affairs

This paper proposes an adaptive sparsity-based direct position determination (DPD) appoach to locate multiple targets in the case of time-varying channels. The novel feature of this method is to dynamically adjust both the overcomplete basis and the sparse solution based on a two-step dictionary learning (DL) framework. The method first performs supervised offline DL by using the quadratic programming approach, and then the dictionary is continuously updated in an incremental fashion to adapt to the time-varying channel during the online stage. Furthermore, the method does not need the number of emitters a prior. Simulation results demonstrate the performance of the proposed algorithm on the location estimation accuracy.

关键词： Dictionary Learning Compressive Sensing Direct Location Time-Varying Channel Quadratic Programming

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Sparsity-Based Direct Location Estimation Based on Two-step Dictionary Learning

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Communications and network 2013年第3期5卷 421-425页

作者： Tingting Wang Wei Ke Gang Liu The Jiangsu Engineering Center of Meteorological Sensor Network Technology Nanjing University of Information Science and Technology Nanjing China The Jiangsu Key Laboratory on Optoelectronic Technology School of Physics and Technology Nanjing Norm University Nanjing China Key Labortory of Disaster Reduction and Emergency Rseponse Engineering of the Ministry of Civil Affairs Beijing Chinaa The Jiangsu Key Laboratory on Optoelectronic Technology School of Physics and Technology Nanjing Norm University Nanjing China The Jiangsu Key Laboratory on Optoelectronic Technology School of Physics and Technology Nanjing Norm University Nanjing China Key Laboratory of Disaster Reduction and Emergency Response Engineering of the Ministry of Civil Affairs Beijing China

关键词： Dictionary Learning Compressive Sensing Direct Location Time-Varying Channel Quadratic Programming

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Adaptive Rake receiver joined with chip equalization for DS-CDMA UWB systems over ISI channels

Adaptive Rake receiver joined with chip equalization for DS-...

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2012 International Workshop on Information and Electronics engineering, IWIEE 2012

作者： Wang, Feng Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing 210044 China

Since there is much larger channel delay spread, there is serious inter-symbol interference (ISI) when ultrawideband (UWB) wireless communication systems work at high data speed. The serious ISI affects the performance of UWB systems seriously. In this paper, a scheme to suppress ISI is developed for direct sequence spread-code division multiple access (DS-CDMA) UWB systems with a high data speed and an adaptive joint chip equalization Rake (AJCE-Rake) receiver is proposed. The proposed AJCE-Rake receiver spreads the number of traditional Rake receiver taps to collect multi-path component and equalize the inter-chip interference simultaneously. Then the soft output of AJCE-Rake receiver is despreaded with the user's spreading code. Finally, the decision is made to recover the transmitted symbol. The simulation results verify that ISI is suppressed effectively and the system performance is improved evidently. © 2011 Published by Elsevier Ltd.

关键词： Code division multiple access

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Adaptive Rake Receiver Joined with Chip Equalization for DS-CDMA UWB Systems over ISI Channels

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Procedia engineering 2012年 29卷 3768-3773页

作者： Feng Wang Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science & Technology Nanjing 210044 China

关键词： UWB ISI Rake receiver MMSE Chip equalization

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UWB autocorrelation receiver based on average differential transmitted reference

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Journal of networks 2012年第11期7卷 1868-1875页

作者： Wang, Feng Ji, Xuande Wang, Yuyan Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing China Department of Electrical Engineering and Automation Luoyang Institute of Science and Technology Luoyang China

There are strong noise components included in the reference signal and the received signal of the ultra- wideband (UWB) differential transmitted reference (DTR) autocorrelation receiver, which impact on the receiver's performance seriously. Therefore this paper proposes a autocorrelation receiver based on average differential transmitted reference (ADTR). This receiver averages the received signals within every frame of the previous symbol period to form the new reference signal. The received signals within each frame of the current symbol interval are also averaged to construct the new received signal, which is correlated with the new reference signal to restore the transmitted symbols. Theoretical analysis and simulation results confirm that BER performance of ADTR autocorrelation receiver is better than the DTR receiver. Compared with DTR receiver, the signal to noise ratio gains of the ADTR receiver are 1.1dB with Ns=3 and 2.1dB with Ns=6 respectively when BER=10-4. © 2012 ACADEMY PUBLISHER.

关键词： Signal to noise ratio

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Wavelet weighted multi-modulus blind equalization algorithm based on fractional lower order statistics

Wavelet weighted multi-modulus blind equalization algorithm ...

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作者： Xu, Fang Guo, Yecai Guo, Jun Nanjing University of Information Science and Technology Nanjing Jiangsu 210044 China Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing Jiangsu 210044 China Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing Jiangsu 210044 China

ISBN: (纸本)9783642259883

When environmental noise keeps to fractional lower order α-stable distribution, the convergence performance of the traditional blind equalization algorithm is unstable. To overcome the deficiency, on the basis of combining weighted multi-modulus blind equalization algorithm (WMMA) with fractional lower order statistics (FLOS), a wavelet weighted multi-modulus blind equalization algorithm based on FLOS is proposed. This proposed algorithm uses FLOS to suppress the α-stable noise, utilizes WMMA to adjust the modulus in the cost function, and uses normalized orthogonal wavelet transform to reduce the autocorrelation of the input signals. The computer simulation indicates that the proposed algorithm is suitable for the equalization of higher order QAM signals. Compared with constant modulus algorithm based on FLOS and WMMA based on FLOS, the convergence performance of this proposed algorithm is superior. © Springer-Verlag Berlin Heidelberg 2011.

关键词： Blind equalization

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