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A TSK Fuzzy Approach to Channel Estimation for OFdM Systems

Journal of Electronic Science and technology 2006年第2期000卷

作者： ZHANG Jian HE Zhi-ming WANG Xue-gang LO Ka Leong School of Electronic Engineering University of Electronic Science and Technology of China Chengdu 610054 China UTStarcom Telecom R&D Center Shenzhen 518057 China

This paper proposes a TSK fuzzy approach to channel estimation for Orthogonal Frequency division Multiplexing (OFdM) systems. The information of dispersive fading channel is described by using TSK fuzzy model, which is updated by the pilot symbols. The proposed approach can trace the variation of channel and it is computationally simple. Its performance is tested via simulations. results show that it is comparable to that of ideal Minimum Mean-Square-Error (MMSE) method, especially at the low Signal to Noise ratio (SNr).

关键词： orthogonal frequency division multiplexing TSK fuzzy model robust channel estimation

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用生物降解性聚合物调节纳米粒子大小及囊封油溶性活性成分的方法(英文)

用生物降解性聚合物调节纳米粒子大小及囊封油溶性活性成分的方法...

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2006年中国化妆品学术研讨会

作者：赵恩哲赵吉元安钟建金容震朴胄映郑京洙延在昊金俊吾张利燮 Skin Research Institute Amorepacific Corporation／R&D Center 314-1 Bora-dong Giheung-gu Yongin 446-729 Korea Department of Chemical Engineering Polymer Research Institute Pohang University of Science and Technology Pohang 790-784 Korea Department of Agricultural Science Korea National Open University 169 Dongsoong-dong Chongno-gu Seoul 110-791 Korea Skin Research Institute Amorepacific Corporation／R&D Center 314-1 Bora-dong Giheung-gu Yongin 446-729 Korea Skin Research Institute Amorepacific Corporation／R&D Center 314-1 Bora-dong Giheung-gu Yongin 446-729 Korea AmorePacific R&D Certer in Shanghai No．383 Yumin Road Malu Town Jiading District Shanghai AmorePacific R&D Certer in Shanghai No．383 Yumin Road Malu Town Jiading District Shanghai Skin Research Institute Amorepacific Corporation／R&D Center 314-1 Bora-dong Giheung-gu Yongin 446-729 Korea Skin Research Institute Amorepacific Corporation／R&D Center 314-1 Bora-dong Giheung-gu Yongin 446-729 Korea

本文介绍了用生物降解性及生物相容性聚合物调节纳米粒子大小及囊封油溶性活性成分的方法。通过改变疏水与两性可生物降解聚合物的比例,可以在60nm到200nm范围之间调节纳米粒子的粒径大小。由于纳米颗粒是由疏水性的内核及亲水性端基组... 详细信息

本文介绍了用生物降解性及生物相容性聚合物调节纳米粒子大小及囊封油溶性活性成分的方法。通过改变疏水与两性可生物降解聚合物的比例,可以在60nm到200nm范围之间调节纳米粒子的粒径大小。由于纳米颗粒是由疏水性的内核及亲水性端基组成,所以可以不借助于乳化剂或表面活性剂在水中稳定存在。dSC图谱显示油溶性生物活性成分与聚合物的疏水性内核结合稳定。在40℃条件下对纳米粒子囊封的维生素A和三甲氧基肉桂酸麝香草酚酯进行测试,结果显示1个月后维生素A的含量仍维持在90％以上,且6个月后纳米粒子中无结晶析出。

关键词：纳米粒子油溶性生物降解性聚合物活性成分

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Effect of Laser Bias Current to the Third Order Intermodulation in the radio over Fibre System

Effect of Laser Bias Current to the Third Order Intermodulat...

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International rF and Microwave Conference, rFM

作者： S. Yaakob W. r. Wan Abdullah M. N. Osman A. K. Zamzuri r. Mohamad M. r. Yahya A. F. Awang Mat M. r. Mokhtar H. A. Abdul rashid TM Research and Development Sdn Bhd UPM-MTDC Technology Incubation Center One Serdang Selangor Darul Ehsan Malaysia TM R&D Sdn Bhd Serdang Selangor Malaysia TM R&D Sdn Bhd Idea Tower UPM-MTDC Incubation Centre One Lebuh Silikon 43400 Serdang Selangor Malaysia. wanrazli@tmrnd.com.my romli@tmrnd.com.my razman@tmrnd.com.my ridz@mmu.edu.my TM R&D Sdn Bhd Idea Tower UPM-MTDC Incubation Centre One Lebuh Silikon 43400 Serdang Selangor Malaysia. drfatah@tmrnd.com.my romli@tmrnd.com.my razman@tmrnd.com.my ridz@mmu.edu.my Faculty of Engineering Multimedia University Cyberjaya Selangor Malaysia Faculty of Engineering Multimedia University Jalan Multimedia 63100 Cyberjaya Selangor Malaysia. hairul.azhar@mmu.edu.my romli@tmrnd.com.my razman@tmrnd.com.my ridz@mmu.edu.my

Third order intermodulation (IM 3 ) can cause non-linearity effects which result in interference and crosstalk between the subcarriers in radio over fibre (rOF) transmissions. This paper presents the experimental results of the effect of varying the magnitude of the laser bias current on the IM 3 in an rOF system with direct modulation. We also investigate the behaviour of the system spurious free dynamic range (SFdr) with the bias current variation. The results show that there will be an optimum bias current range for a given range of the radio frequency (rF) input power in order to minimise the IM 3 effect and obtain the best possible SFdr for the system

关键词： Fiber lasers Optical fibers radio frequency Optical modulation Semiconductor lasers Fiber nonlinear optics Optical crosstalk Intensity modulation Masers Multimedia systems

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Improving designs of CA6dF2 Series diesel Combustion System

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Journal of Beijing Institute of technology 2005年第2期14卷 179-183页

作者：李文祥葛蕴珊胡芳李骏 School of Mechanical and Vehicular Engineering Beijing Institute of Technology Beijing100081 China China FAW Group Corporation R&D Center Changchun130011 China China

The technical improvements are made based on the former CA6110 diesel engine to meet the requirements of Euro Ⅱ emission standards. The performance and emission for CA6dF1 and CA6dF2 are all met the demand of design by improving the fuel, combustion and supercharging systems. The injection system adopts high-pressure pump-pipe-injector injection system. To enhance the injection pressure, the methods of augmenting plunger diameter, decreasing the nozzle hole diameter and reducing the inner diameter of the high-pressure fuel pipe are adopted. The design of combustion chamber and the match of inner fuel distributions with air motion are based on a great deal of experimental database and some simple computer-aided methods, which ensure the optimization of performance and provide the guide for experimental development.

关键词： emission standards diesel engine design of combustion chamber combustion

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Asynchronous Qr-rLS-CMOE Blind Multiuser detection

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Journal of Electronic Science and technology of China 2005年第2期3卷 130-133页

作者：宋春玲吕明徐洋波 School of Electronic Engineering University of Electronic Science and Technology of China Chengdu 610054 China R&D Center Of Intelligent Control and Simulation Engineering Southwest Jiaotong University Chengdu 610031 China

The Qr-rLS-CMOE algorithm which was applied to synchronous dS/CdMA systems in AWGN channel, is modified and applied to asynchronous dS/CdMA systems in multi-path fading channel in this paper. Computer simulation experiences show that the asynchronous Qr-rLS-CMOE (A-Qr-rLS-CMOE) blind multiuser detection algorithm can well cancel multiple access interference and overcome multipath fading, and has a good anti-near-far effect in the case of τ<

关键词： multiple access interference blind multiuser detection A-Qr-rLS-CMOE CdMA

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Microcell urban propagation channel analysis using measurement data

Microcell urban propagation channel analysis using measureme...

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IEEE Conference on Vehicular technology (VTC)

作者： M. Ghoraishi J.-i. Takada T. Imai Department of International Development Engineering Tokyo Institute of Technology Tokyo Japan R&D Center NTT DoCoMo Inc. Kanagawa Japan

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A PN code parallel acquisition algorithm for CdMA communication and its implementation on FPGA

A PN code parallel acquisition algorithm for CDMA communicat...

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International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE)

作者： Xin Zhang GuoLin Sun R&D center ConSymp Electronic Science and Technology Company Limited Chengdu China School of Communications and Information Engineering UESTC Chengdu China

A novel PN code parallel acquisition algorithm for CdMA communication is presented in the paper. Using the mapping methodology from algorithm to architecture, our algorithm is successfully implemented in FPGA chips to... 详细信息

关键词： Multiaccess communication Field programmable gate arrays Correlators Spread spectrum communication Algorithm design and analysis research and development Paper technology Very large scale integration Application specific integrated circuits demodulation

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Advanced design methods of doherty amplifier for wide bandwidth, high efficiency base station power amplifiers

Advanced design methods of Doherty amplifier for wide bandwi...

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European Conference on Microwave

作者： Jangheon Kim Jeonghyeon Cha Ildu Kim Sang Yeon Noh Cheon Seok Park Bumman Kim Department of Electrical Engineering Pohang University of Science and Technology Gyeongbuk South Korea R&D Center Wave Electronics Company Limited Gyeonggi South Korea

We have proposed advanced design methods of doherty amplifier for high efficiency base station power amplifiers with wide bandwidth. First, we develop doherty amplifier with uneven power drive which is provided more input power to the peaking cell than the carrier cell for full power operation and appropriate load modulation. Second, we optimize the matching circuits of the carrier and peaking cells individually to enhance the linearity and efficiency. Third, we optimize the bias circuit to solve an asymmetric ACLr (Adjacent Channel Leakage ratio) characteristics for wideband signals such as WCdMA 4FA. The proposed design methods are applied to implement doherty amplifier using a MrF5P21180. For a 2.14 GHz WCdMA 4FA signal, the amplifier is optimized at 25 W average output power. The drain efficiency and ACLr measured at the power are 33 % and -41 dBc, which represent about 1.3 % and 3 dB improvements, respectively, compared to the doherty amplifier with even power drive. Additionally, the PEP of the amplifier is about 180 W, while that of the comparable doherty amplifier is about 165 W. The difference of ACLr with the bias circuit optimization between lower and upper ACLr is reduced below 2 dB at whole average output power range.

关键词： High power amplifiers design methodology Bandwidth Base stations Power amplifiers Circuits Multiaccess communication Broadband amplifiers Power generation Operational amplifiers

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Asynchronous Qr-rLS-CMOE Blind Multiuser detection

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Journal of Electronic Science and technology 2005年第2期000卷 130-133页

作者： SONG Chun-ling U Ming XU Yang-bo School of Electronic Engineering University of Electronic Science and Technology of China Chengdu 610054 China School of Electronic Engineering University of Electronic Science and Technology of China Chengdu 610054 China R&D Center Of Intelligent Control and Simulation Engineering Southwest Jiaotong University Chengdu 610031 China

关键词： multiple access interference blind multiuser detection A-Qr-rLS-CMOE CdMA

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A high precision motor design method by finite element analysis considering stress distribution in stator core

A high precision motor design method by finite element analy...

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IEEE International Conference on Electric Machines and drives (IEMdC)

作者： A. daikoku M. Nakano S. Yamaguchi Y. Tani Y. Toide H. Arita T. Yoshioka C. Fujino Advanced Technology R&D Center Mitsubishi Electric Corporation Limited Amagasaki Japan Manufacturing Engineering Center Mitsubishi Electric Corporation Limited Amagasaki Japan Sun-yell Engineering Company Limited Amagasaki Hyogo Japan

In this paper we show a novel motor design method, considering stress distribution in the motor core. This method consists of several steps as follows: (a) measurement of magnetic characteristics of the electrical steel sheets in the state where the stress is added, (b) calculation of deformation and stress distribution using structural analysis, (c) pre-process of the magnetic field analysis, which makes FEM mesh deformed by the stress and changes the properties of each elements of the core corresponding to the distribution of the stress, and (d) magnetic field analysis using the measured data by step-(a) and the FEM mesh generated by step-(c). As an example, we show a result of cogging torque calculation of permanent magnet motors, considering the stress in the stator core resulting from shrink fitting in the frame. As a result, we show that the cogging torque waveform is different depending on the shape of the frame

关键词： design methodology Finite element methods Stator cores Magnetic analysis Magnetic field measurement Magnetic cores Electric variables measurement Stress measurement Forging Torque

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