检索结果-内蒙古大学图书馆

A 0.5 V divider-by-2 design with optimization methods for wireless sensor networks

Journal of Semiconductors 2013年第5期34卷 115-120页

作者：王利丹李智群 Institute of RF- & OE-ICs Southeast University Engineering Research Center of RF-ICs & RF-Systems Ministry of EducationSoutheast University Jiangsu Provincial Key Laboratory of Sensor Network Technology

A 0.5 V static master-slave D flip-flop （DFF） divider-by-2 is implemented with a 0.13 μm 1P8M RF- mixed signal CMOS process. Low-threshold transistors in a deep-N well with forward-body bias technology are used in the circuit. Each of the D-latch with source coupled logic consists of sensing and latching circuits. To increase the maximum operating frequency and decrease power consumption, the latching current is one half of the sensing current. The circuit optimization methods are described in this paper. The measured maximum operating frequency is 6.5 GHz and the minimum input singled-signal amplitude is 0.15 V.

关键词： low-threshold transistors deep-N well forward-body bias low voltage

来源：评论

学校读者我要写书评

暂无评论

Backstepping based adaptive control of magnetic levitation system

引用

2013 International Conference on Energy Research and Power engineering, ERPE 2013

作者： Zhou, Wei Liu, Bao Bin Jiangsu Institute of Economic and Trade Technology China Zhejiang University China Jiangsu Engineering and Technology Center of Circulation Modernization and Sensor Network China

ISBN: (纸本)9783037857588

In view of parameter uncertainty in the magnetic levitation system, the adaptive controller design problem is investigated for the system. Nonlinear adaptive controller based on backstepping is proposed for the design of the actual system with parameter uncertainty. The controller can estimate the uncertainty parameter online so as to improve control accuracy. Theoretical analysis shows that the closed-loop system is stable regardless of parameter uncertainty. Simulation results demonstrate the effectiveness of the presented method. © (2013) Trans Tech Publications Switzerland.

关键词： Backstepping

来源：评论

学校读者我要写书评

暂无评论

A low power quadrature up-conversion mixer for WSN application

引用

High technology Letters 2013年第3期19卷 228-232页

作者：吴晨健 Li Zhiqun Institute of RF-& OE-ICs Southeast University Engineering Research Center of RF-ICs & RF-Systems Ministry of EducationSoutheast University Jiangsu Provincial Key Laboratory of Sensor Network Technology

This paper presents an up-conversion mixer for 2.4GHz wireless sensor networks in 0. 181xm RF complementary metal-oxide semiconductor （CMOS） technology. It is based on a double-balanced Gilbert cell type. With two Gilbert cells it was applied quadrature modulation. Operational ampli- tiers are used in this design to improve the conversion gain under low power consumption. The mixer design is based on 0.18txm RF CMOS process. And the mixer test results indicate that under 1.8V power supply, with input frequency 2.4 - 2.4835GHz, the conversion voltage gain is 1.2 - 2dB. When the output frequency is 2.4GHz, its power gain is -4.46dB, and its input referred 1 dB com- pression point is -11.5dBm and it consumes 1.77mA current.

关键词： mixer low power Gilbert operational amplifier

来源：评论

学校读者我要写书评

暂无评论

A 2 MHz 1 V programmable gain amplifier for WSN application

A 2 MHz 1 V programmable gain amplifier for WSN application

引用

2013 IEEE International Conference on Signal Processing, Communications and Computing, ICSPCC 2013

作者： Chengsi, Yang Zhiqun, Li Institute of RF- and OE-ICs Southeast University Nanjing China Engineering Research Center of RF-ICs and System Ministry of Education Nanjing China Key Laboratory of Sensor Network Technology of Jiangsu Province Wuxi China

ISBN: (纸本)9781479910274

This paper presents a low-voltage and low-power programmable gain amplifier (PGA) for Wireless sensor network (WSN) in 0.18 μm CMOS process. MOSFETs biased to moderate inversion region are applied in order to achieve maximum voltage gain, low device dissipation, and high linearity, simultaneously. The proposed PGA consists of three fixed-gain stages and a variable-gain stage. It works at 2 MHz with a voltage gain range of 0 dB to 70 dB in steps of 2 dB. Postsimulation results show that the -3 dB-bandwidth is higher than 6.6 MHz with capacitive loads of 2 pF. The whole PGA consumes less than 1.26 mW with a 1 V supply. © 2013 IEEE.

关键词： Wireless sensor networks

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

An Energy-Efficient Asynchronous MAC for Bulk-Data Collection in Wireless sensor networks

An Energy-Efficient Asynchronous MAC for Bulk-Data Collectio...

引用

International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC

作者： Fulong Jiang Hao Liu National ASIC System Engineering Research Center Southeast University Nanjing China Jiangsu Provincial Key Laboratory of Sensor Network Technology Southeast University in Wuxi Wuxi China

ISBN: (纸本)9781479913275

In this paper, we propose a new asynchronous MAC protocol, the AW-MAC, for bulk-data collection in wireless sensor networks. We develop a routing-enhanced adaptive wakeup mechanism and an on-demand channel assignment scheme that allow the protocol to transform from single channel asynchronous schedule to multi-channel TDMA schedule in an on-demand fashion. These schemes overcome the sleep latency problem of duty-cycling and avoid the inefficiency of unscheduled asynchronous channel access. The simulation results show that our protocol largely reduces the latency on collecting bulk data then the state-of-the-art asynchronous duty-cycle MAC protocol while consuming similar energy.

关键词： Media Access Protocol Wireless sensor networks Packet loss Schedules Receivers

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

0.18μ m cmos low voltage power amplifier for wsn application

引用

Telkomnika - Indonesian Journal of Electrical engineering 2013年第8期11卷 4470-4476页

作者： Chenjian, Wu Zhiqun, Li Nan, Yao Meng, Zhang Liang, Chen Jia, Cao Institute of RF- and OE-ICs Southeast University 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

This paper presents the design of a Class A/B power amplifier (PA) for 2.4-2.4835GHz Wireless sensor network (WSN) system in 0.18μm CMOS technology. The PA adopts the single-stage differential structure and the output power of the PA can be controlled by switching the sizes of transistors. Seven different level of output power can be obtained through a three-bit control code. The tested results shows that the proposed PA achieves power added efficiency (PAE) of 26.73% while delivering an output power of 6.35dBm at 1dB compression point. Its power gain is 15.87dB. With a low DC voltage supply of 1V, its power consumption is 15.3mW. The PA die size is 1070×610μm2. © 2013 Universitas Ahmad Dahlan.

关键词： Wireless sensor networks

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：