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MISO mixed phase precoding and its applications with turbo coding schemes

MISO mixed phase precoding and its applications with turbo c...

引用

International Conference on Electrical engineering/electronics, computer, Telecommunications and Information technology, ECTI-CON

作者： D. Chumchewkul K. Sripimanwat A. Lasakul Faculty of Engineering King Mongkuts Institute of Technology Ladkrabang Bangkok Thailand Optical Quantum Communications Laboratory NSTDA National Electronics and Computer Technology Center Pathum Thani Thailand

This paper proposes an application of mixed phase precoding in the MISO (multiple-input, single-output) wireless communications and its concatenation with turbo coding schemes. The principle of this phase precoding is rearranged in the manner of the closed-loop transmitted diversity to reduce the frequency-selective Rayleigh fading channel. Results show that the use of mixed phase precoding in the MISO wireless communication retrieves a lower bit error rate compared to those of related cases of wireless communications.

关键词： 1/f noise

来源：评论

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Distance laboratory applications ERRL: A study on radio communication in electronic field

Distance laboratory applications ERRL: A study on radio comm...

引用

International Conference on Optimization of Electrical and Electronic Equipment, OPTIM

作者： C.C. Aydin G. Turkmen E. Ozyurt E. U. Aydin N. E. Cagiltay M. E. Ozbek N. Ceren Alparslan A. Kara Faculty of Management Atılım University Ankara Turkey Faculty of Management Atylym University Ankara Turkey Electrical and Electronics Engineering Atylym University Ankara Turkey Electrical and Electronics Engineering Atılım University Ankara Turkey Computer Engineering Atylym University Ankara Turkey Computer Engineering Atılım University Ankara Turkey Computer Technology and Information Systems Bilkent University Ankara Turkey

In the last decade, the effect of Internet usage in education is gradually increased. When we look from academic perspective, the new technologies provided alternatives for students learning. As distance education becomes important everyday, the indispensable elements of teaching and education, laboratories must be reachable via remote connection. Consequently, the education that is going to be given to the students will be more flexible with respect to place and time constraints and students can reach laboratory facilities at any time and anywhere not only in lectures and practical hours. In this study, European remote radio laboratory (ERRL) which is a distance remote radio frequency (RF) laboratory designed for electrical-electronics students, is described generally. The software architecture, infrastructure and experiment that can be done with a remote connection have been described.

关键词： Laboratories Antenna measurements Education Microwave measurements Frequency measurement Software Scattering parameters

来源：评论

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Implementation of Swinging-up and Stabilizing Controllers for Inverted Pendulum on Cart System

Implementation of Swinging-up and Stabilizing Controllers fo...

引用

International Symposium on Communications and Information Technologies (ISCIT)

作者： Ekachai Asa Taworn Benjanarasuth Songmoung Nundrakwang Jongkol Ngamwiwit Noriyuki Komine Faculty of Engineering and Research Center for Communications and Information Technology King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand Department of Applied Computer Engineering School of Information Technology and Electronics Tokai University Hiratsuka Kanagawa Japan

In this paper, an implementation of swinging-up and stabilizing controllers for an inverted pendulum on cart is presented. The energy control concept is employed to swing the inverted pendulum up to around the upright position within the assigned switching condition. After that, the stabilizing controller is then switched to stabilize the inverted pendulum at the upright position. The stabilizing controller is a linear servo state feedback controller designed by coefficient diagram method. The experimental results show that the designed controllers can be mutually operated with acceptable efficiency.

关键词： Control systems Weight control Lagrangian functions Information technology Linear feedback control systems Mathematical model Equations Communication system control Power engineering and energy Servomechanisms

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Integrated Wireless Rogue Access Point Detection and Counterattack System

Integrated Wireless Rogue Access Point Detection and Counter...

引用

International Conference on Information Security and Assurance, ISA

作者： Songrit Srilasak Kitti Wongthavarawat Anan Phonphoem Thai Computer Emergency Response Team (ThaiCERT) National Electronics and Computer Technology Center Klong Luang Pathum Thani Thailand Intelligent Wireless Network Group (IWING) Department of Computer Engineering Faculty of Engineering Kasetsart University Bangkok Thailand

In this paper we propose the integrated solution for detection and counterattack the rogue access points. Classification of rogue access point and related risk assessment is analyzed. Rogue detection algorithm is also proposed. Our proposed solution is effective and low cost. It is designed to utilize the existing wireless LAN infrastructure. There is no need to acquire the new RF devices or dedicated wireless detection sensors. The experiments in the real system are demonstrated.

关键词： Communication system security Wireless LAN Protection Authorization Information security Wireless networks Internet Telecommunication traffic Local area networks Intelligent networks

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Effect of Exposure Energy, Focus Range, and Surface Reflection on the Photolithography Process of Contact Hole Patterning

Effect of Exposure Energy, Focus Range, and Surface Reflecti...

引用

International Conference on Electrical engineering/electronics, computer, Telecommunications and Information technology, ECTI-CON

作者： R. Sonboonton E. Chaowicharat P. Meesapawong J. Ladthidej W. Titiroongruang C. Hruanun Electronic Research Center Department of Electronics Faculty of Engineering King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand Thai Microelectronics Center National Electronics and Computer Technology Center Amphur Muang Chachoengsao Thailand

The patterning the contact holes by photolithography process, in this case polysilicon contacts, is the process to produce electrical connection between metal layer and polysilicon gates or metal layer and source/drain. The photolithography process can control size and shape of the contact hole patterns on photoresist before permanently patterned by etching process and then metallization. The contact holes were specified to have the size of 0.8 micron after the photolithography process. In order to achieve this, the process parameters to be considered are exposure energy, focus length of the lens system, and the effect of light reflecting from the film topography underneath. Since in the previous processing step, the attempt to reduce the film topography was done by planarization using BPSG. By adjusting the exposure energy and focus, the optimal condition, to produce 0.8 micron contact holes, was found to be energy of 305 mJ/cm 2 and focus of -1.0 mum.

关键词： Lithography Resists Surface treatment Reflection Contacts Logic gates Planarization

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A 2.4-GHz 43-dB CMOS Logarithmic Amplifier for RF Signal Level Detection

A 2.4-GHz 43-dB CMOS Logarithmic Amplifier for RF Signal Lev...

引用

International Conference on Electrical engineering/electronics, computer, Telecommunications and Information technology, ECTI-CON

作者： S. Wongnamkam A. Thanachayanont M. Krairiksh National Electronics and Computer Technology Center Klong Luang Pathum Thani Thailand Faculty of Engineering and Research Center of Communications and Information technology King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand

This paper describes the design and implementation of a 2.4-GHz fully-differential logarithmic amplifier for RF signal power detection. A novel self-bias wideband amplifier without on-chip inductor is employed as a limiting amplifier stage. The proposed logarithmic amplifier is realized and fabricated in a 0.35-mum CMOS technology. Measurement results showed that the circuit achieved 43-dB voltage gain, while drawing 73.5 mA from a single 2.5-V power supply voltage.

关键词： Bandwidth CMOS integrated circuits Limiting Gain Capacitors Rectifiers RF signals

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OTA-based electronically adjustable floating positive/negative resistor

OTA-based electronically adjustable floating positive/negati...

引用

SICE Annual Conference

作者： Wandee Petchmaneelumka Thawatchai Kamsri Chaleampan Wangwiwatthana Vanchai Riewruja Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand Thai Microelectronics Center (TMEC National Electronics and Computer Technology Center Amphur Muang Chachoengsao Thailand

ISBN: (纸本)9784907764302

This paper presents a method to realize an operational transconductance amplifier (OTA) based adjustable floating resistor. The magnitude of the resulting resistance can be electrically varied by changing the external bias currents of OTAs. The proposed resistor is based on an active network termed ldquodual-output voltage-to-current (DO-V/I) converterrdquo, which is the OTA-based voltage-to-current converter with electronically variable property. The realization method provides both a positive and a negative resistance using the same scheme. The proposed design is attractive in the terms of simple configuration and low cost. Experimental results showing the circuit performance based on the use of the commercially available OTAs are includes.

关键词： Resistors Resistance Transconductance Total harmonic distortion Oscillators Electronic mail Circuit optimization

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An accurate CCII-based voltage controlled current source

An accurate CCII-based voltage controlled current source

引用

International Conference on Control, Automation and Systems ( ICCAS)

作者： Anucha Kaewpoonsuk Vanchai Riewruja Apinai Rerkratn Thawatchai Kamsri Department of Physics Faculty of Science Naresuan University Phitsanulok Thailand Faculty of Engineering King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand Thai Microelectronics Center (TMEC) National Electronics and Computer Technology Center Thailand

In this paper, a voltage controlled current source (VCCS) providing low distortion in output signal and wide output current range is introduced. In order to obtain the high accuracy, the proposed technique employs the designed scheme to connect in feedback loop of the basic VCCS based on second generation current conveyor (CCII). This scheme consists of instrumentation and differential amplifiers and one resistor. The performances of the proposed circuit were studied through the use of PSPICE simulation program. Simulation results are agreed with the expected values.

关键词： Voltage control Instruments Thermal resistance Automatic voltage control Control systems Differential amplifiers Feedback loop Resistors Circuit simulation Automation

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Evaluation of voice activity and voicing detection

Evaluation of voice activity and voicing detection

引用

INTERSPEECH 2008 - 9th Annual Conference of the International Speech Communication Association

作者： Kotnik, Bojan Sendorek, Pierre Astrov, Sergey Koc, Turgay Ciloglu, Tolga Fernández, Laura Docío Banga, Eduardo Rodríguez Höge, Harald Kačič, Zdravko Faculty of Electrical Engineering and Computer Science University of Maribor Slovenia Department TSI Signal-Images Telecom Paristech France Corporate Technology Siemens AG Munich Germany Electrical and Electronics Eng. Dept Middle East Technical University Ankara Turkey Signal Processing and Communications Dept. University of Vigo Spain

This paper describes the ECESS evaluation campaign of voice activity and voicing detection. Standard VAD classifies signal into speech and non-speech, we extend it to VAD+ so that it classifies a signal as a sequence of non-speech, voiced and unvoiced segments. The evaluation is performed on a portion of the Spanish SPEECON database with manually labeled segmentation. To avoid errors caused by the limited precision of manual labeling we introduce "dead zones" -tolerance intervals ±5 ms around label changes in the data set. In these tolerance intervals we don't evaluate the signal. Copyright © 2008 ISCA.

关键词： Speech communication

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Merged three-terminal magnetotransistor based on the carrier recombination - deflection effect

Merged three-terminal magnetotransistor based on the carrier...

引用

IEEE SENSORS

作者： Chana Leepattarapongpan Naritchapan Penpondee Toempong Phetchakul Weera Phengan Eakalak Chaowicharat Charndet Hruanun Amporn Poyai Thai Microelectronics Center National Electronics and Computer Technology Center Chachoengsao Thailand Electronic research center Department of ElectronicFaculty of Engineering King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand

This article presents a merged three terminals magnetotransistor based on the carrier recombination - deflection effect. This particular magnetotransistor structure relies on the combination of difference of base current and collector current in +x and -x directions. As a result, the output voltage and absolute sensitivity to magnetic field will be double. The structure of magnetotransistor consists of one emitter, two collector and two base contacts. The devices can detect magnetic field in vertical direction (B Z ) by relying on the difference between base current and collector current (DeltaI CB ). From the experiment, with emitter current at 5, 8, and 10 mA, the magnetotransistor had the highest sensitivity of 1.125 mV/mT when emitter current was at 10 mA.

关键词： Magnetic separation Magnetic fields Magnetic sensors Magnetic devices Spontaneous emission Voltage Chaos Microelectronics CMOS process CMOS technology

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