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International Conference on Communication technology (ICCT)

作者： Meng Zhang Zhiqun Li Sensor Network Technology Research Center South East University Wuxi China Engineering Research Center of RF-ICs and RFIC-Systems Ministry of Education Nanjing China Southeast University Nanjing Jiangsu CN

ISBN: (纸本)9781612843063

This paper provides a low power low noise differential amplifier designed for Wireless sensor network (WSN) in TSMC 0.18 μm RF CMOS process. It should work well centered at 2.44 GHz frequency and the forward gain is variable with highest gain at 12 dB to lowest gain at -2 dB by 2 dB steps. In this paper, a two-stage cascade common-gate (CG) topology and two external inductor choke coils are used to achieve input matching of LNA under low power consumption, and a differential inductor has been designed as the load to achieve reasonable gain and reduce chip area simultaneously. It has been simulated and verified by means of Cadence Spectre. The NF (Noise Figure) at high gain (12.5 dB) is 3.9 dB, the input referenced 1dB compression point (IP1dB) is about -1 dBm at lowest gain mode. The LNA consumes about 1.5 mA current from 1.8 V power supply.

关键词： Inductors Gain Integrated circuit modeling Wireless sensor networks Impedance matching Noise Topology

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A low power consumption, low phase noise, and wide tuning range LC VCO with ACC

A low power consumption, low phase noise, and wide tuning ra...

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International Conference on Communication technology (ICCT)

作者： Xiaodong Qi Zhiqun Li Sensor Network Technology Research Center South East University Wuxi China Engineering Research Center of RF-ICs & RF-Systems Ministry of Education Nanjing China Southeast University Nanjing Jiangsu CN

ISBN: (纸本)9781612843070

A 4.8GHz LC voltage controlled oscillator (VCO) for WSN Applications is designed based on TSMC 0.18 μm RF CMOS process. The VCO adopts complementary differential negative resistance structure with switch resistor biasing which achieves good phase noise performance and realizing low power consumption. The 3-bit switch capacitor array provides wide tuning range and the 6-bit switch resistors array provides varied biasing current by auto current calibration (ACC) circuit. With a 1.8V supply voltage, the post-simulated result achieves 27.7% tuning range that can compensate the frequency deviation due to process corners. The post simulated phase noise is -119dBc/Hz@1MHz at frequency of 2.44GHz. The operating current of the VCO core is from 0.4mA to 3.3mA. Finally, the chip size of the VCO core is 0.3mm 2 and the whole chip size is 0.8×1.2mm 2 with testing buffer and pads.

关键词： Voltage-controlled oscillators Phase noise Tuning Power demand Switches Arrays

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0.5 V 4.8 GHz CMOS LC VCO for WSN application

Jiefangjun Ligong Daxue Xuebao/Journal of PLA University of ...

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Jiefangjun Ligong Daxue Xuebao/Journal of PLA University of Science and technology (Natural Science Edition) 2012年第6期13卷 611-614页

作者： Li, Zhi-Qun Zhao, Sheng Institute of RF and OE-ICs Southeast University Nanjing 210096 China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Southeast University Nanjing 210096 China Jiangsu Provincial Key Laboratory of Sensor Network Technology Wuxi 214135 China

A 0.5 V 4.8 GHz CMOS LC VCO for WSN application was designed. The VCO uses traditional differential negative-resistance structure. With a switched capacitor array, VCO achieves a large tuning range. Thanks to the combination of voltage-boosting circuit, VCO can have a control voltage larger than the supply voltage. Several technologies like width-length-ratio-adjusting of the transistors were used to optimize phase noise performance. The VCO uses 0.13 μm CMOS technology. The proposed VCO achieves a phase noise less than -115 dBc/Hz@1 MHz, and -121.2 dBc/Hz at most and consumes about 2.6 mA core current at 0.5 voltage supply. The performance of VCO meets the requirement of the design target.

关键词： Phase noise

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A feature selection algorithm based on Hoeffding inequality and mutual information

International Journal of Signal Processing, Image Processing...

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International Journal of Signal Processing, Image Processing and Pattern Recognition 2015年第11期8卷 433-444页

作者： Yin, Chunyong Feng, Lu Ma, Luyu Yin, Zhichao Wang, Jin School of Computer and Software Jiangsu Key Laboratory of Meteorological Observation and Information Processing Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing China Nanjing No.1 Middle School Nanjing China

With the rapid development of the Internet, the application of data mining in the Internet is becoming more and more extensive. However, the data source’s complex feature redundancy leads that data mining process becomes very inefficient and complex. So feature selection research is essential to make data mining more efficient and simple. In this paper, we propose a new way to measure the correlation degree of internal features of dataset which is a mutation of mutual information. Additionally we also introduce Hoeffding inequality as constraint of constructing algorithm. During the experiments, we use C4.5 classification algorithm as test algorithm and compare HSF with BIF(feature selection algorithm based on mutual information). Experiments results show that HSF performances better than BIF[1] in TP and FP rate, what’s more the feature subset obtained by HSF can significantly improve the TP, FP and memory usage of C4.5 classification algorithm. © 2015 SERSC.

关键词： Feature Selection

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A study of agricultural meteorological monitoring system based on wireless sensor networks

International Journal of Multimedia and Ubiquitous Engineeri...

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International Journal of Multimedia and Ubiquitous engineering 2014年第7期9卷 15-26页

作者： Ma, Li Yan, Jingzhou Yan, Shuangshuang Wang, Baowei Liao, Kuo Wang, Jin Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and Technology Nanjing 210044 China Ningde Meteorological Bureau Ningde 352100 China

In order to keep the sustainable development of agricultural industry, monitoring the four basic essential elements' changes, which are temperature, humidity, light intensity, carbon dioxide, and applying the corresponding solution is really necessary. An agriculture meteorological monitoring system with ZigBee wireless sensor networks (WSNs)and wireless communication technology is designed in this paper. sensor nodes are distributed in the measurement area and form a self-organizing network. The sink collects information which transmitted from sensor nodes and then, sends the information to the server. Server will summarize the information, then taking analysis and processing. At the end, the server will give some corresponding warningand forecast. The cost of this system is low and could improve the accuracy and timeliness in agricultural meteorological monitoring. © 2014 SERSC.

关键词： Zigbee

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LQR Control Method based on Improved Antlion Algorithm

LQR Control Method based on Improved Antlion Algorithm

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第42届中国控制会议

作者： Zhe Sun Zhi Wen Lei Xu Guangfu Gong Xiangpeng Xie Zhixin Sun Post Big Data Technology and Application Engineering Research Center of Jiangsu Province Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications

In the face of the increasing demand of crane transportation speed and stability,an improved Ant-lion algorithm is proposed in this *** the original basis,the quasi-reverse learning method is used to improve the stability of the algorithm and make the initial data distributed ***,an elite ant-lion growth mechanism is introduced to accelerate the convergence speed of the simulation and improve the simulation ***,the proposed algorithm is verified in the double pendulum system of crane based on LQR controller,and the feasibility and effectiveness of the proposed algorithm are proved by experiments.

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A copyright protection method for wireless sensor networks based on digital watermarking

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International Journal of Hybrid Information technology 2015年第6期8卷 257-268页

作者： Wang, Baowei Su, Jianwei Zhang, Youdong Wang, Biqiang Shen, Jian Ding, Qun Sun, Xingming School of Computer and software Nanjing University of Information Science and Technology Nanjing210044 China Jiangsu Engineering Center of Network Monitoring Nanjing210044 China Department of Computer Engineering Huaiyin Institute of Technology Huaian223003 China Hubei Meteorological Service Center Wuhan430074 China

Wireless sensor networks are composed of numerous sensor nodes in the monitored area, which have been well applied in various practical areas. In these applications, data security from sensors has been threatened. Thereby in this paper, a digital watermarking based copyright protection method is proposed with regard to data security in wireless sensor networks. According to the particular characteristics of collecting data, the embedding capacity can be expanded using this method of manipulating both LSB and MSRB 4. bits of the data field. The data-related information is embedded as the digital watermarking into the data to be forwarded. When the base station receives the data, we use a lookup Table to improve the speed of data parsing. In order to achieve and verify the copyright protection on WSNs, both theoretical analysis and experimental results have demonstrated that the method can effectively detect the data reliability. In addition, we also generate two-dimensional code based on the test results, thereby facilitating the user's copyright authentication. © 2015 SERSC.

关键词： sensor nodes

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Layered Compression Scheme for Efficient Data Collection of sensory Data

Layered Compression Scheme for Efficient Data Collection of ...

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International Conference on Computer Communication and networks

作者： Siguang Chen Shujun Zhang Bin Xu Jing Hu Vijayakumar Varadarajan Jiangsu Engineering Research Center of Communication and Network Technology Nanjing University of Posts and Telecommunications Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China Information Center Jiangsu China Tobacco Industry Co. Ltd. Nanjing China School of Computing Science and Engineering VIT University Chennai India

Although the existing compressed sensing (CS) based spatio-temporal data compression schemes can significantly decrease communication consumption for data collection, they ignore the data correlation among different clusters over spatial dimension. Actually, the discovery and utilization of spatial correlation among different clusters can further increase the compression rate (or improve the recovery effect). In this paper, we propose a layered compression scheme for efficient data collection of sensory data (LCS-EDC). In the proposed scheme, first, we design a multi-layer network architecture to support the exploration of spatio-temporal correlations, especially for exploring the spatial correlation among different clusters. And then, we construct the specific projection methods respectively for exploring the temporal correlation in sensory nodes, spatial correlation (intra-cluster) in cluster heads and spatial correlation (inter-cluster) in processing nodes. Meanwhile, the detailed solving method is developed to recover original data and achieve the approximate data collection in sink node. Finally, simulation results indicate that the proposed layered compression scheme has better recovery performance as compared with traditional clustered compression schemes (i.e., achieving efficient data collection with high quality).

关键词： Compressed sensing data correlation multi-layer architecture data collection recovery error

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Wideband tri-band filter design using stepped-impedance stub resonators

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International Journal of Hybrid Information technology 2013年第5期6卷 249-254页

作者： Cui, Mengmeng Liu, Yun Xue, Shengjun Wang, Jin Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing China School of Applied Meteorological Science Nanjing University of Information Science and Technology Nanjing China College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing China

This letter presents a wideband tri-passband filter in which tri-section stepped-impedance shunt-stubs are used as tri-mode resonators, connected by transmission lines. Developed from the topology of quarter-wavelength stub filters, these filters have much wider passbands compared to many other designs published. The stepped-impedance stubs also contribute transmission zeros between the passbands, thus increasing the isolation. A prototype filter with passbands located at 0.6-1, 1.5-1.8 and 2.2-2.4 GHz is designed by an optimization method. Good agreement between simulation and measurements in respect of low insertion loss and high isolation is demonstrated. © 2013 SERSC.

关键词： Bandpass filters

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Research and development of mobile application for android platform

International Journal of Multimedia and Ubiquitous Engineeri...

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International Journal of Multimedia and Ubiquitous engineering 2014年第4期9卷 187-198页

作者： Ma, Li Gu, Lei Wang, Jin Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China Key Laboratory of Meteorological Disaster Ministry of Education Nanjing University of Information Science and Technology Nanjing 210044 China

Today, as the developing of hardware of mobile is getting better, the performance index is much higher than the actual requirements of the software configuration. Phone's features more depend on software. As the Android operating system is getting more popular, the application based on Android SDK attracts much more attention. But now, some of the Android application interface is too cumbersome, pop-up ads is overmuch and the function is too single, these cause some inconvenience to the users. This article presents the application by eliminating the redundancy. Three kinds of applications are developed base on Java and Android SDK --- Weibo client, video player and audio player. The audio player uses the ContentResolver and Curor to obtain music files and plays the music by using the Service Components to call the Media Player class in the background. The video player uses the Media Player class provided by Android SDK. This class loads the file through URL, realize the multimedia file parsing by calling the Open Core Library, which is at the bottom of Android, through JNI and by calling the Surface Flinger interface to realize the video files' playback. The users' data is collected through the Sina open platform called by Sina client and the data will be returned under the format of JSON by the Sina server. The system uses the OAuth authentication method for user authorization to complete the login process. The specific functions of this system are developed based on Android Weibo SDK. The interfaces of these Android apps are pretty and the operation is smooth. What's more, the cumbersome interface and excessive advertising are eliminated, so that users are able to manipulate these apps more conveniently and smoothly. © 2014 SERSC.

关键词： Android (operating system)

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