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Cluster-based spectrum sensing for cognitive radios with imperfect channel to cluster-head

Cluster-based spectrum sensing for cognitive radios with imp...

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IEEE Conference on Wireless Communications and Networking

作者： Mahdi Ben Ghorbel Haewoon Nam Mohamed-Slim Alouini Electrical Engineering Program King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia Electronics and Communication Engineering Hanyang University Ansan South Korea

Spectrum sensing is considered as the first and main step for cognitive radio systems to achieve an efficient use of spectrum. Cooperation and clustering among cognitive radio users are two techniques that can be employed with spectrum sensing in order to improve the sensing performance by reducing miss-detection and false alarm. In this paper, within the framework of a clustering-based cooperative spectrum sensing scheme, we study the effect of errors in transmitting the local decisions from the secondary users to the cluster heads (or the fusion center), while considering non-identical channel conditions between the secondary users. Closed-form expressions for the global probabilities of detection and false alarm at the cluster head are derived.

关键词： Signal to noise ratio Sensors Cognitive radio Error probability Shadow mapping Binary phase shift keying Fading

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Study of LCP Based Flexible Patch Antenna Array

Study of LCP Based Flexible Patch Antenna Array

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IEEE International Symposium on Antennas and Propagation

作者： Farhan A. Ghaffar Atif Shamim Langis Roy Electrical Engineering Program King Abdullah University of Science and Technology Thuwal Saudi Arabia Department of Electronics Carleton University Ottawa Canada

ISBN: (纸本)9781467304610

Wrapping of a two element LCP based patch antenna array is studied in this work. For the first time, the designed array is bent in both E and H planes to observe the effect on the radiation and impedance performance of the antenna. The 38 GHz simulation results reveal better performance for H plane bending as compared to E plane bending. A 100 um thick substrate is used for the design which is best suited for flexible antenna applications. Gain variations of 1.1 dB and 1.4 dB are observed for the two orientations while a significantly increased impedance bandwidth of 3 % is obtained with H plane wrapping. The design is highly suitable for broadband micro-cellular backhaul applications.

关键词： KLHDC2 gene LCP Wrapping Patch antennas plane Antenna arrays Platanus hybrida Planing Hydrogen FLEXIBLE Radiation

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A study of shunt active power filter based on modular multilevel converter (MMC)

A study of shunt active power filter based on modular multil...

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IEEE/IAS International Conference on Industry Applications (INDUSCON)

作者： Frederico T. Ghetti André A. Ferreira Henrique A.C. Braga Pedro G. Barbosa Power Electronics and Automation Group Electrical Engineering Program Federal University of Juiz de Fora Juiz de Fora Minas Gerais Brazil

ISBN: (纸本)9781467324120

This paper presents a study of a shunt active power filter based on the modular multilevel converter (MMC) topology. The current controller of the shunt active power filter uses a PI-MRI (PI with multi reference frame integrators) technique to assure that the APF current tracks the reference signal. It is also investigated the performance of the method of selection and classification used to choose and to control which submodule (SM) of the MMC will become active. Simulation results will be used to evaluate and to demonstrate the behavior of MMC as active power filter.

关键词： Active filters Capacitors Harmonic analysis Power harmonic filters Voltage control Switches Shunts (electrical)

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Active power filter operation of an electric vehicle applied to single-phase networks

Active power filter operation of an electric vehicle applied...

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IEEE/IAS International Conference on Industry Applications (INDUSCON)

作者： Márcio C. B. P. Rodrigues Henrique J. Schettino André A. Ferreira Pedro G. Barbosa Henrique A. C. Braga Power Electronics and Automation Group Electrical Engineering Post-Graduation Program Federal University of Juiz de Fora Juiz de Fora Brazil

ISBN: (纸本)9781467324120

This work proposes the application of a battery or plug-in electric vehicle powertrain on the mitigation of possible residential electricity network power quality problems by means of the integration of a shunt active power filter into its power electronics circuitry. The integration of additional functions to an electric vehicle is a very desirable feature, since it can result on cost reduction (in comparison to the separately implementation of the integrated functions). Simulation results provide evidence of the possible employment of power electronics converters, inherent to the vehicle propulsion system, in order to reduce harmonic content and improve power factor in single-phased electric networks.

关键词： Active filters Power harmonic filters Harmonic analysis Voltage control Electricity Vehicles

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Device Interoperability and Authentication for Telemedical Appliance based on the ISO/IEEE 11073 Personal Health Device (PHD) Standards

Device Interoperability and Authentication for Telemedical A...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Luther Paul R. Caranguian Susan Pancho-Festin Luis G. Sison a graduate student in the MS Electrical Engineering (Instrumentation and Control) program of University of the Philippines Diliman. Festin is with the Department of Computer Science University of the Philippines Diliman. with the Electrical and Electronics Engineering Institute University of the Philippines Diliman.

ISBN: (纸本)9781424441198

In this study, we focused on the interoperability and authentication of medical devices in the context of telemedical systems. A recent standard called the ISO/IEEE 11073 Personal Health Device (X73-PHD) Standards addresses the device interoperability problem by defining common protocols for agent (medical device) and manager (appliance) interface. The X73-PHD standard however has not addressed security and authentication of medical devices which is important in establishing integrity of a telemedical system. We have designed and implemented a security policy within the X73-PHD standards. The policy will enable device authentication using Asymmetric-Key Cryptography and the RSA algorithm as the digital signature scheme. We used two approaches for performing the digital signatures: direct software implementation and use of embedded security modules (ESM). The two approaches were evaluated and compared in terms of execution time and memory requirement. For the standard 2048-bit RSA, ESM calculates digital signatures only 12% of the total time for the direct implementation. Moreover, analysis shows that ESM offers more security advantage such as secure storage of keys compared to using direct implementation. Interoperability with other systems was verified by testing the system with LNI Healthlink, a manager software that implements the X73-PHD standard. Lastly, security analysis was done and the system's response to common attacks on authentication systems was analyzed and several measures were implemented to protect the system against them.

关键词： Interoperability Telemedical Authentication

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Analysis of monopole antenna over a ground plane by a Meshless Local Petrov-Galerkin method

Analysis of monopole antenna over a ground plane by a Meshle...

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European Conference on Antennas and Propagation, EuCAP

作者： Ramon Dornelas Soares Renato Cardoso Mesquita Fernando Jose da Silva Moreira Electrical Engineering Postgraduate Program Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil Department Electrical Engineering Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil Department Electronics Engineering Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil

In this work, two different configurations of a monopole mounted over a ground plane have their input admittance determined by a meshless numerical simulation. The Meshless Local Petrov-Galerkin is used with shape functions generated by Moving Least Squares. Boundary conditions are imposed by a collocation scheme that avoids numerical integrations. The proposed axisymmetric analysis has a simple implementation. The results are in agreement with theoretical data and simulations found in the literature.

关键词： Antennas Boundary conditions Silicon Shape Mathematical model Numerical models

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Dual Band UHF RFID Antenna

Dual Band UHF RFID Antenna

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Telecommunications Forum

作者： Suvad Selman Nesibe Merve Demir Moamer Hasanovic Electrical and Electronics Engineering Program Faculty of Engineering and Natural Sciences International University of Sarajevo

ISBN: (纸本)9781467329835

Radio Frequency Identification (RFID) systems have been extensively used in many important applications in recent years. The band allocated to RFID technology in the UHF band differs from continent to continent but there are two main, 800MHz used in Europe and the some Asian countries while in the USA, Japan and Australia they use 900 MHz frequency band. A 2-element planar RFID antenna for RFID readers in a low cost compact package is developed. The smart antenna covers both bands that are used and therefore goods that are tagged and coming from one part of the world can be recognized on the other part of the world. Microstrip circular antenna loaded with a U-shape slot is developed because of their planar structure, low profile, and ease of integration with other circuit components.

关键词： Radio Frequency Identification (RFID) dual band RFID antenna microstrip circular antenna slot antenna

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BLOCK-BASED DECISION-FEEDBACK EQUALIZERS WITH REDUCED REDUNDANCY

BLOCK-BASED DECISION-FEEDBACK EQUALIZERS WITH REDUCED REDUND...

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European Signal Processing Conference

作者： Wallace A. Martins Paulo S. R. Diniz Federal Center for Technological Education Dept. of Control and Automation Industrial Eng. Federal University of Rio de Janeiro Depart. of Electronics and Computer Eng. Electrical Engineering Program

ISBN: (纸本)9781467310680

In recent years many works related to the design of block-based transceivers have been published. The main target of this research activity is to optimize the use of the spectral resources in broadband transmissions. A possible way to address this problem is to reduce the amount of redundancy required by block transmissions to avoid interblock interference. An efficient solution is to employ zero-padding zero-jamming (ZP-ZJ) transceivers, which allow the transmission with reduced redundancy. ZP-ZJ systems have been successfully employed in the context of linear transceivers. This paper shows how the ZP-ZJ concept can be applied in decisionfeedback equalization. Some performance analyses based on the resulting mean-square error and error probability of symbols are included to show the possible degrading effects of the reduction in the amount of redundancy. Nevertheless, simulation results illustrate that data throughput and average mutual information between transmitted and estimated symbols can be enhanced significantly without affecting the system performance, for a certain level of signal-tonoise ratio at the receiver.

关键词： Block DFE Reduced redundancy Throughput redundancy Transceivers Research Activities System performance Signs and symbols feedback equalizer data throughput Error probability Transmissions broadband

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Analysis of monopole antenna over a ground plane by a Meshless Local Petrov-Galerkin method

Analysis of monopole antenna over a ground plane by a Meshle...

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6th European Conference on Antennas and Propagation, EuCAP 2012

作者： Soares, Ramon Dornelas Mesquita, Renato Cardoso Da Silva Moreira, Fernando Jose Elect. Eng. Postgraduate Program Federal University of Minas Gerais Av. Antonio Carlos 6627 31270-901 Belo Horizonte MG Brazil Dept. Electrical Engineering Federal University of Minas Gerais Av. Antonio Carlos 6627 31270-901 Belo Horizonte MG Brazil Dept. Electronics Engineering Federal University of Minas Gerais Av. Antonio Carlos 6627 31270-901 Belo Horizonte MG Brazil

ISBN: (纸本)9781457709180

关键词： Monopole antennas

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Selective gas sensing with a single graphene-on-silicon transistor

Selective gas sensing with a single graphene-on-silicon tran...

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IEEE Silicon Nanoelectronics Workshop (SNW)

作者： A.A. Balandin S. Rumyantsev G. Liu M.S. Shur R.A. Potyrailo Nano-Device Laboratory Department of Electrical Engineering and Materials Science and Engineering Program Bourns College of Engineering University of California Riverside Riverside CA USA Center for Integrated Electronics and Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA Ioffe Physical-Technical Institute Russian Academy of Science Saint Petersburg Russia Chemistry and Chemical Engineering GE Global Research Center Niskayuna NY USA

The low-frequency 1/f noise in graphene transistors has been studied extensively owing to the proposed graphene applications in analog devices and communication systems [1-5]. The studies were motivated by the fact that the low-frequency noise can be up-converted by device nonlinearity and contribute to the phase noise of the system. Similarly, the sensor sensitivity is often limited by the electronic low-frequency noise. Therefore, noise is usually considered as one of the main limiting factors for the device or overall system operation. However, the electronic noise spectrum itself can be used as a sensing parameter increasing the sensor sensitivity and selectivity. Here, we show that vapors of different chemicals produce distinguishably different effects on the low-frequency noise spectra of the graphene-on-Si transistor. Our study showed that some gases change the electrical resistance of pristine graphene devices without changing their low-frequency noise spectra while other gases modify the noise spectra by inducing Lorentzian components with distinctive features. The characteristic corner frequency f C of the Lorentzian noise bulges in graphene devices is different for different chemicals and varies from f C =10 - 20 Hz for tetrahydrofuran to f C =1300 - 1600 Hz for chloroform. We tested the selected set of chemicals vapors on different graphene device samples and alternated different vapors for the same samples. The obtained results indicate that 1/f noise in combination with other sensing parameters can allow one to achieve the selective gas sensing with a single pristine graphene transistor. Our method of gas sensing with graphene does not require graphene surface functionalization or fabrication of an array of the devices with each tuned to a certain chemical. The observation of the Lorentzian components in the vapor-exposed graphene can also help in developing an accurate theoretical description of the noise mechanism in graphene.

关键词： Transistors Sensors Low-frequency noise Chemicals Gases Physics

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