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IEEE International Workshop on Radio-Frequency Integration technology (RFIT)

作者： Zhiqun Li Qinqing Cao Xiaodong Qi Shuangshuang Zheng Jiangsu Provincial Key Laboratory of Sensor Network Technology Southeast University Wuxi China Engineering Research Center of RF-ICs & RF-System Ministry of Education Nanjing China

A fully integrated 5-GHz PLL frequency synthesizer for WSN applications has been designed and implemented in 0.18μm CMOS technology. With automatic current calibration technique (ACC), the VCO could maintain a good performance under a small current consumption of about 0.3mA. Phase switching technique is used in the frequency divider to reduce power consumption. Using a 1.8V supply voltage, the measured power consumption is 12mW and the phase noise is -111.13dBc/Hz at 1MHz offset.

关键词： Frequency synthesizers Voltage-controlled oscillators Wireless sensor networks Power demand Frequency conversion Phase noise Frequency control

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0.5 V 4.8 GHz CMOS LC VCO for WSN application

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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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Design and optimization of CMOS LNA with ESD protection for 2.4 GHz WSN application

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Journal of Semiconductors 2011年第10期32卷 103-112页

作者：李智群陈亮张浩 Institute of RF-& OE-ICs Southeast University RFIC and System Engineering Research Center of Ministry of Education of China Southeast University Research Center of Sensor Network Technology Southeast University

A new optimization method of a source inductive degenerated low noise amplifier（LNA） with electrostatic discharge protection is *** can achieve power-constrained simultaneous noise and input matching. An analysis of the input impedance and the noise parameters is also *** on the developed method,a 2.4 GHz LNA for wireless sensor network application is designed and optimized using 0.18-μm RF CMOS technology. The measured results show that the LNA achieves a noise figure of 1.59 dB,a power gain of 14.12 dB, an input 1 dB compression point of-8 dBm and an input third-order intercept point of 1 *** DC current is 4 mA under a supply of 1.8 V.

关键词： LNA ESD protection noise and input impedance matching CMOS

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Hybrid neural network model application in annual precipitation forecast

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International Journal of u- and e- Service, Science and technology 2012年第4期5卷 21-30页

作者： Ma, Li Li, Xuelian 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

When applied to precipitation forecasting, the mean generating function - optimal subset regression (MGF-OSR) model is limited by its low accuracy and high error, while the back propagation (BP) neural network model has difficulty in learning for matrix selection. This paper proposes a new MGF-OSR-BP model, which uses a MGF to extend original data, an OSR to select the best series as the BP neural network input node and learning matrix, and the resultant data for training. The training procedure determines the number of hidden layers and uses an optimal number of hidden layers for model training. This paper uses the MGF-OSR-BP model to analyze precipitation data from Hangzhou, China, for 53 years, from 1956 to 2008. The 1956-2006 precipitation data are used as the training sample, and the 2007-2008 data are used as the test set data to verify the practicality of the forecast system. A fitting verification is performed using the forecasted data against field measurement data, and the results show that the forecast accuracy is better than that of the MGF-OSR model or the MGF stepwise multiple regression model.

关键词： Backpropagation

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Research on temperature channel calibration of data-acquisition unit of automatic weather station

Research on temperature channel calibration of data-acquisit...

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IEEE 2011 10th International Conference on Electronic Measurement and Instruments, ICEMI 2011

作者： Wu, Xiangjuan Lv, Wenhua Xing, Hongyan Zou, Yingquan Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing 210044 China Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science and Technology Nanjing 210044 China Meteorological Observation Center China Meteorological Administration Beijing 100081 China

ISBN: (纸本)9781424481590

A method of utilizing active resistance network to calibrate the temperature channel of data-acquisition unit is proposed in this paper. This method changes gate-source voltage by micro-controller so as to simulate the resistance. Compares resistance value measured by data-acquisition unit with the simulated resistances to calibrate the performance of the data-acquisition unit. Take DT50 data-acquisition unit in CAWS600 AWS for an example. By software commands, output current and A/D sample duration time of the data-acquisition unit temperature channel are changed to resolve the problem of parameters mismatch, then this data-acquisition unit is calibrated effectively. The experiment result shows this approach provide a reliable means to calibrate AWS data-acquisition unit. © 2011 IEEE.

关键词： Calibration

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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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Weighted Multi-Modulus Blind Equalization Algorithm Based on Momentum Term

Weighted Multi-Modulus Blind Equalization Algorithm Based on...

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2011 International Conference on Mechanical engineering and technology(ICMET 2011)

作者： Shijie Guo Fang Xu Wencai Xu Kang Fan College of Physics and Electronic Information Huaibei Normal University Nanjing University of Information Science & Technology Jiangsu Technology and Engineering Center of Meteorological Sensor NetworkJiangsu Key Laboratory of Meteorological Observation and Information Processing

In order to overcome the defects of traditional constant modulus blind equalization algorithm in equalizing higher-order QAM(Quadrature Amplitude Modulation) signals, on the basis of combining the momentum term algorithm and the weighted multi-modulus blind equalization algorithm, Momentum term based Weighted Multi-Modulus blind equalization Algorithm(WMMA) is proposed. In the proposed algorithm, weighted multi-modulus blind equalization algorithm is used to adjust the modulus of the cost function adaptively and momentum term is employed to improve the convergence speed. The simulation results in the underwater acoustic channel show that the proposed algorithm has higher convergence speed and accuracy than Multi-Modulus blind equalization Algorithm(MMA) and Constant Modulus blind equalization Algorithm(CMA).

关键词： blind equalization algorithm,weighted multi-modulus algorithm,momentum term

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A Video Streaming Application Layer Multicast Protocol for WLAN

A Video Streaming Application Layer Multicast Protocol for W...

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The 2011 International Conference on Materials engineering for Advanced Technologies(ICMEAT 2011)

作者： CHENG Yong WEN Lei YANG Ling WANG Wei ZHOU Yong WANG Feng Jiangsu Technology and Engineering Center for Meteorological Sensor Network Nanjing University of Information Science & Technology Computer School Wuhan University Bin Jiang College Nanjing University of Information Science & Technology

The problem solved in this paper is to design a video streaming protocol which is accomplished by the application layer multicast in the WLANThis protocol, WVALM, divides the whole video streaming into small blocks, and achieves the requirement of streaming multicast by multicasting those small blocksThe receiver and the sender use streaming window and retransmit window respectively to coordinate their relationshipThrough experiment test, WVALM achieves the original object and could work well in the wireless environment.

关键词： video streaming,application layer multicast,WLAN,p2p

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A low power programmable gain amplifier with 70-dB control range in CMOS technology

A low power programmable gain amplifier with 70-dB control r...

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2011 IEEE 13th International Conference on Communication technology, ICCT 2011

作者： Zhang, Bingzhao Li, Zhiqun Institute of RF and OE ICs Southeast University Nanjing 210096 China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Nanjing 210096 China Sensor Network Technology Research Center Southeast University Wuxi 214135 China

ISBN: (纸本)9781612843070

This paper presents a low power programmable gain amplifier (PGA) for low intermediate frequency (IF) Zigbee transceiver applications in 0.18-μm CMOS process. The designed PGA uses ac coupling between the stages to avoid the amplification of DC offset. The post-simulations demonstrate the gain of the PGA can be varied linearly from 0 dB to 70 dB with a step size of 2 dB. The PGA can operate even if an input DC offset of 30 mV. The differential output swing is 1.2 Vpp. The simulated 3 dB bandwidth is higher than 15 MHz and the gain error is less than 0.7 dB with capacitive loads of 2 pF. The PGA consumes only 4mW from 1.8 V supply. The chip area is 1.50×0.80 mm2. © 2011 IEEE.

关键词： CMOS integrated circuits

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Design of a low-power high-speed CMOS frequency divider for WSN applications

Design of a low-power high-speed CMOS frequency divider for ...

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2011 IEEE 13th International Conference on Communication technology, ICCT 2011

作者： Sun, Zhenhua Li, Zhiqun Institute of RF- and OE-ICs Southeast University Nanjing 210096 China Engineering Research Center of RF-ICs and RFIC-Systems Ministry of Education Nanjing 210096 China Sensor Network Technology Research Center Southeast University Wuxi 214135 China

ISBN: (纸本)9781612843070

A 5-GHz CMOS programmable frequency divider is presented in this paper, whose modulus can be varied from 2403 to 2480 for 2.4-GHz ZigBee applications. The divider has two blocks, a dual-modulus prescaler (DMP) integrating a frequency halving circuit, and a pulse-swallow counter. In the DMP, an improved phase switching technique is used to reduce the power consumption. Designed in 0.18-μm CMOS process, simulation shows that the divider can operate over a wide range of 1-6.5 GHz, consumes 7.7 mW from a single 1.8 V supply, and occupies a chip area of approximately 0.02 mm2. © 2011 IEEE.

关键词： CMOS integrated circuits

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