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Optimal incremental-redundancy strategy for type-II hybrid ARQ

Optimal incremental-redundancy strategy for type-II hybrid A...

引用

Proceedings 2003 IEEE International Symposium on Information Theory (ISIT)

作者： Uhlemann, Elisabeth Rasmussen, Lars K. Grant, Alex Wiberg, Per-Arne Computing and Commun. Laboratory Hamlsmtad University Box 823 SE-301 18 Halmstad Sweden Dept. of Computer Engineering Chalmers University of Technology SE-412 96 Göteborg Sweden Inst. for Telecom. Research University of South Australia Mawson Lakes SA 5095 Australia

Given a type-II hybrid ARQ scheme, we propose a general solution to find the optimal partitioning of n - k parity bits over at most M transmissions. The solution is in terms of maximizing the average code rate for a g... 详细信息

关键词： Information theory

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CMOS differential pair transconductor with active-error feedback

CMOS differential pair transconductor with active-error feed...

引用

IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： S. Szczepanski K. Slawomir R. Schaumann Faculty of Electronics Telecommunications and Informatics Gdansk University of Technology Gdansk Poland Inst. of Telecommun. Tech. Univ. Gdansk Poland Department of Electrical and Computer Engineering Portland State University Portland OR USA

A linearization method based on the active-error feedback concept is presented for the design of highly linear, CMOS differential pair transconductor. The proposed circuit implementation combines a conventional source-coupled differential pair with a simple error amplifier in negative feedback path. As a result, improved linearity of the developed transconductor is obtained. SPICE simulations show that for 0.5/spl mu/m HP AMOS14TB process (MOSIS) with a /spl plusmn/2.5V power supply, total harmonic distortion (THD) at 1.2V/sub PP/ is less then 0.15% in comparison to 1.85% without linearization.

关键词： Transconductors Transfer functions Voltage Transconductance Feedback circuits Linearity Differential equations Circuit topology Output feedback informatics

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Optimal scheduling for iterative decoding

Optimal scheduling for iterative decoding

引用

IEEE International Symposium on Information Theory

作者： F. Brannstrom L.K. Rasmussen A. Grant Dept. of Computer Engineering Chalmers University of Technology Göteborg Sweden Inst. for Telecommunications Research University of South Australia Mawson Lakes SA Australia

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Pulse baseline wander removal using wavelet approximation

Pulse baseline wander removal using wavelet approximation

引用

computers in Cardiology (CinC)

作者： K.Q. Wang L.S. Xu L. Wang Z.G. Li Y.Z. Li Dept. of Comput. Sci. & Eng. Harbin Inst. of Technol. China Department of Computer Science and Engineering Harbin Institute of Technology Harbin China

Pulse waveform is the key to the traditional Chinese pulse diagnosis. However, its baseline wander introduced in the acquisition may result in misdiagnosis. What's more, recent advancements in the pulse variability analysis require more accuracy of baseline estimation. In this paper, a wavelet based cascaded adaptive filter (CAF) was presented to remove this drift. The CAF works in two stages. The first stage is a discrete Meyer wavelet approximation and the second stage is a cubic spline estimation. The experimental results on 50 simulated and 200 real pulse signals demonstrate the powerful effect of CAF both in removing the baseline wander and in preserving the diagnostic information of pulse waveform, comparing with some traditional methods, such as cubic spline estimation, morphology filter and linear-phase FIR least-squares-error digital filter. In addition, this CAF is easy to be accomplished and needs no prior knowledge on pulse and its baseline drift.

关键词： Finite impulse response filter Spline Wiener filter Morphology Digital filters Modems Signal processing Adaptive filters Cutoff frequency Fluctuations

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A preferred link based multicast protocol for wireless mobile ad hoc networks

A preferred link based multicast protocol for wireless mobil...

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IEEE International Conference on Communications (ICC)

作者： R.S. Sisodia I. Karthigeyan B.S. Manoj C.S.R. Murthy Department of Computer Science and Engineering Indian Institute of Technology Madras Chennai India Indian Institute of Technology Madras Chennai Tamil Nadu IN Dept. of Comput. Sci. & Eng. Indian Inst. of Technol. Madras India

Existing multicast routing protocols for mobile ad hoc networks can be broadly classified into two categories, tree based protocols and mesh based protocols. Mesh based protocols have high packet delivery ratio compared to tree based protocols, but incur more control overhead. The packet delivery ratio of tree based protocols decreases with increasing mobility. This is due to the occurrence of frequent tree breaks and lack of proper tree maintenance mechanisms. These tree breaks result in frequent flooding of JoinQuery packets by the multicast group member nodes which try to get re-connected to the tree. These broadcast packets collide with the data packets and reduce the efficiency of the protocol. We propose an efficient protocol which we call as preferred link based multicast protocol (PLBM). PLBM uses a preferred link approach for forwarding JoinQuery packets. Subsets of neighbors of a node are selected using a preferred link based algorithm. These nodes, termed as preferred nodes, are only eligible for further forwarding of JoinQuery packets. We also propose a quick link break detection mechanism that locally repairs broken links. Simulation results show that our protocol performs better than other existing multicast protocols in terms of packet delivery ratio and control overhead.

关键词： Multicast protocols Mobile ad hoc networks Routing protocols Classification tree analysis Broadcasting Mobile communication Bandwidth Network topology computer science Multicast algorithms

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Product sustainability improvement based on performance of product components

Product sustainability improvement based on performance of p...

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IEEE International Symposium on Electronics and the Environment

作者： G. Meimei Mengchu Zhou Dept. of Electr. & Comput. Eng. New Jersey Inst. of Technol. Newark NJ USA Department of Electrical & Computer Engineering Multi-lifecycle Engineering Research Center New Jersey Institute of Technology Newark NJ USA

The sustainability target method (STM) provides a practical sustainability target for individual businesses and products through determining the relative indicator resource productivity (RP) for environmental performance and the absolute indicator eco-efficiency (EE) for sustainability. This paper investigates an optimal decision making approach for a company to improve its product's sustainability using the STM indicators RP and EE of the product components. Sensitivity analysis is used to provide a methodology to indicate which components should receive attention to make the overall product more sustainable. The feasibility of the approach is validated using a case study of a generalized product consisting of multiple components, which relates easily to circuit board assemblies and other types of electronic products.

关键词： Production Sensitivity analysis Productivity Companies Sustainable development Power generation economics Economic indicators Environmental economics Virtual reality Printed circuits

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Novel software architecture for power distribution automation

Novel software architecture for power distribution automatio...

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IEEE General Meeting Power& Energy Society

作者： R.P. Gupta S. Tiwari R.K. Varma Department of Electrical Engineering Indian Institute of Technology Kanpur India Indian Institute of Technology Kanpur Kanpur Uttar Pradesh IN Dept. of Electr. Eng. Indian Inst. of Technol. Kanpur India Department of Electrical and Computer Engineering University of Western Ontario London Ontario Canada

This paper presents a new structure for the software elements used at the distribution control center. The proposed software structure is modular in nature and permits the development of the distribution automation system in a phased manner by the different vendors. It has been successfully implemented in an actual 33/11 kV substation.

关键词： Software architecture Power distribution Automatic control Substation automation Power engineering and energy Power system reliability computerized monitoring Remote monitoring Power industry Control systems

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Photochemical deposition of ZnS thin films by pulsed illumination

Photochemical deposition of ZnS thin films by pulsed illumin...

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World Conference on Photovoltaic Energy Conversion

作者： R. Kobayashi N. Sato M. Ichimura E. Arai Department of Electrical and Computer Engineering Nagoya Institute of Technology Aichi Japan Nagoya Kogyo Daigaku Nagoya Aichi JP Dept. of Electr. & Comput. Eng. Nagoya Inst. of Technol. Aichi Japan

We prepared ZnS thin films by photochemical deposition (PCD) using continuous and pulsed illumination. The aqueous solution containing ZnSO/sub 4/, Na/sub 2/S/sub 2/O/sub 3/ and H/sub 2/SO/sub 4/ was illuminated with light from a high-pressure mercury lamp. When the illumination was continuous, the deposited film was black and not transparent. But pulsed illumination made the deposited film white and transparent. And the film deposited by pulsed illumination has photosensitivity.

关键词： Photochemistry Zinc compounds Sputtering Lighting Semiconductor films Substrates Electrodes Lamps Photovoltaic cells Electrons

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RF passive devices on Si substrates with close to ideal EM performance

RF passive devices on Si substrates with close to ideal EM p...

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Device Research Conference

作者： K.T. Chan C. Chin M.-F. Li D.L. Kwong S.P. McAlister D.S. Duh W.J. Lin Dept. of Electronics Eng. National Chiao Tung Univ. Hsinchu Taiwan Si Nano Device Lab. National Univ. of Singapore Singapore Department of Electrical & Computer Engineering University of Technology Austin TX USA Dept. of Electrical & Computer Eng. The Univ. of Texas Austin TX USA National Research Council Ottawa Canada Inst. of Nuclear Energy Research Taoyuan Taiwan

ISBN: (纸本)0780377273

RF passive devices, such as transmission lines, inductors, antennas and band-pass filters, fabricated on Si substrates, show performance close to that obtained by E-M simulations, from 1 to 110 GHz. This was achieved using an optimized /spl sim/4 MeV proton implantation process performed after device fabrication to avoid contamination and can be masked by photoresist.

关键词： Radio frequency Inductors Band pass filters Resonance Protons Contamination Power transmission lines Pollution measurement Propagation losses Antenna measurements

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COPD severity classification using principal component and cluster analysis on HRV parameters

COPD severity classification using principal component and c...

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Annual Northeast Bioengineering Conference

作者： D.A. Newandee S.S. Reisman A.N. Bartels R.E. De Meersman Electrical and Computer Engineering Department New Jersey Institute of Technology Newark NJ USA New Jersey Institute of Technology Newark NJ US Dept. of Electr. & Comput. Eng. New Jersey Inst. of Technol. Newark NJ USA Rehabilitation Medicine Department Columbia University New York NY USA

The application of principal component analysis and cluster analysis (PCA-CA) using heart rate variability (HRV) parameters to identify the most severe chronic obstructive pulmonary disease (COPD) subjects in a mixture of normal and COPD population is discussed. These parameters were obtained from real physiological data and cross-spectral analysis (i.e. the coherence and partial coherence between heart rate, blood pressure and respiration signals). Results demonstrated that these two groups could be differentiated with greater than 99.0% accuracy. Furthermore, differences on the same HRV parameters between all four severity levels of COPD subjects were also investigated. These groups were differentiated with over 88.0% accuracy. In analyzing the studied data of the COPD population, the technique correctly characterized 8.5% of COPD group as severe COPD. It was concluded that the PCA-CA technique identified the combination of parameters that can classify disease severity (COPD) as well as differences between normal and COPD subjects in a mixed population. The PCA-CA technique could perhaps also be used to classify other diseases non-invasively.

关键词： Heart rate variability Surgery Blood pressure Diseases Lungs Biomedical engineering Data analysis Signal analysis Heart rate Laboratories

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