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检索条件"主题词=Adaptive coding"

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Signal compression using a new adaptive wavelet technique 14

Signal compression using a new adaptive wavelet technique

引用

14th International Conference on Microelectronics

作者： Ghamry, NAE Elsimary, HA Habib, SED Elect Res Inst Giza Egypt

ISBN: (纸本)0780375734

This paper describes an efficient one dimensional wavelet adaptive coding algorithm for the compression of audio signals. The new algorithm has the property that the most appropriate wavelet filter is selected from a library of wavelet filters according to a proposed switching criterion. This algorithm yields a system that can adapt to the time variance of a signal. Simulation results are demonstrated for several audio signals to show the superior performance of the new method.

关键词： 1-D wavelet transform adaptive coding biorthogonal filters

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On redundancy of coding using binary tree decomposition

On redundancy of coding using binary tree decomposition

引用

IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： A. Krivoulets IT-University of Copenhagen Denmark

We present an estimation of the redundancy of source coding using symbol binarization as a function of the decomposition tree and binary coding technique.

关键词： Binary trees Tree graphs Arithmetic Probability distribution Binary sequences Source coding adaptive coding Entropy

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Browsing video online using semantic information

Browsing video online using semantic information

引用

International Conference on Control, Automation, Robotics and Vision (ICARCV)

作者： J.R. Wang R. Wang N. Parameswaran J.S. Jin School of Computer Science and Engineering University of NSW Sydney Australia School of information Technologies University of Sydney NSW Australia

With the development of hardware and large capacity communication facilities, video has been more and more widely used in every field. Delivering video over the Internet has posted a big problem. Video files are extremely big and need hours or even tens of hours to download. Much research has been attempted over low-level structures such as coding, buffer, protocol, agent and server. These techniques are either not scalable or impractical. This paper presents a system designed to allow efficient retrieving, browsing and real-time playing of videos through the Internet using a web browser. Testing results on resource usage and system usability are presented.

关键词： Video on demand Bandwidth Image segmentation Australia Internet Encoding Local area networks adaptive coding Access protocols XML

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The effects of adaptive modulation on the TCP performance

The effects of adaptive modulation on the TCP performance

引用

International Conference on Communications, Circuits and Systems (ICCCAS)

作者： Li Zou Yuping Zhao Bing Wang Qinglin Liang Department of Electronics Peking University Beijing China

To increase the link layer throughput, 802.16 Working Group defines the application of adaptive modulation in Broadband Wireless Access System (BWA). On the other hand.. the transport layer performance can be specified, for example, by Transmission Control Protocol (TCP) throughput. In this paper we analyse the link layer throughput by using adaptive modulation, as well as the TCP performance. Furthermore, the joint consideration of the data link layer and transport layer performance over a BWA network is discussed. The simulation results showed that the adaptive modulation in link layer could improve the TCP throughputs. In addition, criteria for the modulation selection considering both transport layer and link layer is given.

关键词： Throughput Bit error rate Modulation coding Quality of service adaptive coding Time division multiplexing Time division multiple access OFDM modulation Transport protocols Access protocols

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Signal compression using a new adaptive wavelet technique

Signal compression using a new adaptive wavelet technique

引用

International Conference on Microelectronics, ICM

作者： N.A.E. Ghamry H.A. Elsimary S.E.-D. Habib Electronics Research Institute Giza Egypt Electronics and Communications Department Cairo University Egypt

关键词： Discrete wavelet transforms adaptive coding Signal processing algorithms Signal resolution Frequency adaptive filters Testing Libraries Communication switching Wavelet transforms

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A generalized adaptive code acquisition scheme using backpropagation network in DS/SS systems

A generalized adaptive code acquisition scheme using backpro...

引用

International Conference on Communication Systems

作者： Takki Yu Sangchul Han Daesik Hong Changeon Kang Information and Telecommunication Laboratory Department of Electrical and Electronic Engin. Yonsei University Seoul South Korea

ISBN: (纸本)0780375106

A generalized adaptive code acquisition scheme is proposed by using a multi-layer structure. The backpropagation network (BPN) is used in modeling the multilayer system. The timing offset of the received code can be detected by combining the hidden layer weights after an adaptation period. The characteristics of mean squared error (MSE) and weight distribution for the generalized system are analyzed, and the effects of input and hidden nodes are investigated. The generalized system provides a high detection probability and flexibility in acquisition system design.

关键词： adaptive coding Backpropagation Intelligent networks Delay estimation adaptive systems adaptive filters Finite impulse response filter Timing Spread spectrum communication Time measurement

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Bit energy distribution effects in progressively encoded video frame transmissions

Bit energy distribution effects in progressively encoded vid...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： M. Sehlstedt J.P. LeBlanc Division of Signal Processing Luleå University of Technology Lulea Sweden

We investigate physical layer opportunities resulting from multimedia streams which use progressive coding. With such progressively encoded video frames the location of the first bit error is more important than the overall bit error probability. This makes the expected error free length a reasonable metric for performance optimization. One physical layer opportunity is the adjustment of bit energy within data frames. For wireless links nonuniform bit-energy distributions result in a flexible solution that may be used in conjunction with channel coding. We identify system gains to be achieved with nonuniform bit energy distribution optimizations and also show that a simplified frame truncation technique may be used without significant loss of quality.

关键词： Streaming media Physical layer Strips Delay Channel coding Degradation adaptive coding Feedback Decoding Image coding

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adaptive Code Length FEC for Uncompensated Metropolitan 320 Gb/s DWDM Networks

Adaptive Code Length FEC for Uncompensated Metropolitan 320 ...

引用

European Conference on Optical Communication (ECOC)

作者： Hanlim Lee Chanyoul Kim Yongdeok Kim Sungjin Park Byungjik Kim Junho Koh Seongtaek Hwang Yunje Oh Byungchang Kang Telecommunication Research & Development Center Optical N/W Research & Development Group Samsung Electronics Company Limited Kyunggi South Korea

This paper suggests a new adaptive length FEC algorithm to satisfy various line rates for metropolitan 32 ch × 10 Gb/s DWDM systems. With using FEC, the receiver sensitivity of transmission over 100 km of standar... 详细信息

关键词： adaptive coding Wavelength division multiplexing Forward error correction Digital signal processing Optical signal processing Optical fiber networks Clocks Optical receivers Voltage Optical sensors

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R-D analysis of adaptive edge representations

R-D analysis of adaptive edge representations

引用

IEEE Workshop on Multimedia Signal Processing

作者： R.M. Figueras i Ventura L. Granai P. Vandergheynst Signal Processing Institute Swiss Federal Institute of Technology Lausanne Switzerland

This paper presents a rate-distortion analysis for a simple horizon edge image model. A quadtree with anisotropy and rotation is performed on this kind of image, giving a toy model for a non-linear adaptive coding technique, and its rate-distortion behavior is studied. The effect of refining the quadtree decomposition is also analyzed.

关键词： Anisotropic magnetoresistance Rate-distortion Image coding Switches adaptive signal processing Image analysis Signal analysis adaptive coding Image representation Piecewise linear techniques

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An overview of the ETSI-BRAN HIPERACCESS physical layer air interface specification

An overview of the ETSI-BRAN HIPERACCESS physical layer air ...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： K. Fazel C. Decanis J. Klein G. Licitra L. Lindh Y.Y. Lebret Marconi Communications Backnang Germany Ericsson Laboratory Italy Milan Italy Ensemble Communications Inc. San Diego CA USA Siemens ICN S.p.A. Milan Italy Nokia Helsinki Finland Alcatel Nanterre France

The ETSI-BRAN-HIPERACCESS standard is confined to specify the radio subsystem above 11 GHz of a point-to-multi-point (PMP) interoperable system consisting of the physical (PHY) layer and the data link control (DLC)/convergence layer (CL) - which are both core network independent. The paper gives a description of the physical layer, which specifies the transmission scheme in order to allow interoperability between equipment developed by different manufacturers. This is achieved by standardizing all baseband signal processing structures in the transmitter side by using the most technology advanced architecture and components. The system, by employing adaptive coding and modulation (i.e. individual link adaptation) and cell sectorization techniques, offers a high spectral efficiency and a great flexibility for the deployment. Furthermore, the specification includes basic RF aspects and those other parameters necessary for radio regulatory purposes.

关键词： Physical layer Portable media players Radio control Control systems Convergence Pulp manufacturing Baseband adaptive signal processing Radio transmitters adaptive coding

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