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检索条件"主题词=adaptive coding"

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Reducing model cost by weighted symbol decomposition

Reducing model cost by weighted symbol decomposition

引用

IEEE International Symposium on Information Theory

作者： F.M.J. Willems P.A.J. Volf Electrical Engineering Department Eindhovan University of Technology Netherlands

We discuss a symbol-decomposition method that combines the descriptions of the resulting models to save model redundancy. The proposed method is based on weighting.

ISBN: (纸本)0780371232

We discuss a symbol-decomposition method that combines the descriptions of the resulting models to save model redundancy. The proposed method is based on weighting.

关键词： Costs Context modeling Binary sequences Compression algorithms Arithmetic adaptive coding

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Allocation of subchannel based on SINR and OVSF codes with allocation rate to reduce the self interference in OFDMA-CDM with rate adaptation

Allocation of subchannel based on SINR and OVSF codes with a...

引用

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

作者： Satoru Iijima Iwao Sasase Department of Information and Computer Science Keio University Yokohama Kanagawa Japan

ISBN: (纸本)9781424451227;9781424451234

In orthogonal frequency division multiple access -code division multiplexing (OFDMA-CDM), rate adaptation is known as one of the key techniques to improve the reliability of the transmission signal. However, since the one subchannel size in OFDMA-CDM depends on the spreading code length, the fading shift which the transmission signal receives per one subchannel might depend on the spreading code length. If the influence of the fading shift can be suppressed according to the multiplexing ratio, the effect of the rate adaptation can be improved. In addition, by allocating the subchannel with multiuser diversity in OFDMA, the effect of the rate adaptation can be more improved. We propose a subchannel allocation scheme based on the maximum, minimum and average signal to interference plus noise ratio (SINR) and orthogonal variable spreading factor (OVSF) code allocation to despread in narrowband according to the multiplexing ratio. We demonstrate that the proposed scheme can improve the bit error rate (BER) performance.

关键词： Signal to noise ratio Multiple access interference Fading Bit error rate Frequency conversion Code division multiplexing Narrowband OFDM Frequency diversity adaptive coding

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adaptive CHANNEL/CODE MATCHING USING HIDDEN MARKOV CHAINS

ADAPTIVE CHANNEL/CODE MATCHING USING HIDDEN MARKOV CHAINS

引用

Asilomar Conference on Signals, Systems & Computers

作者： R.E. Pelle R.A. Scholtz Communication Sciences Institute University of Southern California Los Angeles CA USA

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A Novel Technique for Input Vector Compression in System-on-Chip Testing

A Novel Technique for Input Vector Compression in System-on-...

引用

International Conference on Information Technology (ICIT)

作者： Satyendra N. Biswas Sunil R. Das Mansour H. Assaf Department of Electrical Engineering Technology Georgia Southern University Statesboro GA USA School of Information Technology and Engineering Faculty of Engineering University of Ottawa Ottawa ONT Canada Department of Computer and Information Science College of Arts and Sciences Troy University Montgomery AL USA University of Trinidad and Tobago Arima Trinidad and Tobago

A software based hybrid test vector compression technique for testing system-on-chip integrated circuits using an embedded processor core was previously discussed by the authors. In this approach, a software program is loaded into the on-chip processor memory along with the compressed test data sets. To minimize on-chip storage besides testing time, the test data volume is first reduced by compaction in a hybrid manner before downloading into the processor. The proposed method utilizes a set of adaptive coding techniques for realizing lossless compression. The compaction program need not be loaded into the embedded processor, as only the decompression of test data is required for the automatic test equipment. The developed scheme necessitates minimal hardware overhead, while the on-chip embedded processor can be reused for normal operation on completion of testing. As an extension of this prior work, this paper reports further results on studies of the problem based on the use of Limpel-Ziv-Walsh coding besides Burrows-Wheeler transformation and demonstrates the feasibility of the suggested methodology with simulation results on ISCAS 85 combinational and ISCAS 89 full-scan sequential benchmark circuits.

关键词： System-on-a-chip System testing Circuit testing Software testing Integrated circuit testing Compaction Embedded software Hybrid integrated circuits adaptive coding Automatic testing

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Modem Link-Property Advertisements

Modem Link-Property Advertisements

引用

IEEE Aerospace Conference

作者： William D. Ivancic Lloyd Wood Dan Shell Daniel Floreani Rajiv Asati NASA Glenn Research Center Cleveland OH 44135 United States University of Surrey alumni University of Akron Akron OH 44325 United States Cisco Systems Adelaide South Australia 5000 Australia Cisco Systems Research Triangle Park NC 27709 United States

ISBN: (纸本)9781457705564

Devices and associated applications are increasingly connected to a variety of smart modems that have dynamically varying link characteristics. For example, incoming and outgoing link rates can be varied over time with adaptive coding and modulation to suit the channel characteristics. In addition, those links may go up and down due to a variety of factors. The link rate and conditions offered by the modem to connected devices and associated applications therefore vary. In order to autonomously condition traffic and allow the network to get the most out of the modem's link capacity, the upstream devices and applications need to be informed of the modem's link conditions. This becomes a form of cognitive networking. This paper will discuss the problem and present a simple protocol that can be used to provide upstream devices and applications with downstream link conditions. While the protocol in this document is described in the context of modem radio-frequency link properties, it can also be broadly applied to other scenarios such as cryptographic devices.

关键词： Modems adaptive coding Advertisements cryptoequipment protocols Coupling Devices

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Wavelets and human visual perception in image compression

Wavelets and human visual perception in image compression

引用

International Conference on Pattern Recognition

作者： M.G. Albanesi University of Pavia Pavia Italy

The paper describes a new adaptive coding technique for still, grey-level images. The algorithm is based on a multi-resolution decomposition on biorthogonal wavelet basis and it includes different nonlinear models of the human visual perception in the compression task. Quantization is adaptive, and it is based on considerations about the contrast experiments which aim at determining in which conditions (contrast of the input image, compression ratio) the inclusion of the models improves the performance. The results are compared with standard techniques which do not include considerations about human visual perception.

关键词： Humans Visual perception Image coding Image reconstruction Transfer functions Visual system Multimedia databases Linear systems adaptive coding Quantization

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Intelligent Streaming Video Data over the Web 04

Intelligent Streaming Video Data over the Web

引用

IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： J.R. Wang N. Parameswaran School of Computer Science and Engineering University of New South Wales Australia

ISBN: (纸本)9780769521008

Delivering video over the Web has posted a big problem. Video files are extremely big and need hours or even tens of hours to download. The available bandwidth varies dynamically. The conventional proactive buffering approach used by current video players cannot fully satisfy user needs. This paper presents a system designed to allow efficient retrieving, browsing and real-time playing of videos through the Internet using a web browser. The scheme is domain-specific.

关键词： Streaming media Network servers Bandwidth Internet adaptive coding Buffer storage Access protocols Layout Computer science Real time systems

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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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adaptive rate error control through the use of diversity combining and majority logic decoding in a hybrid-ARQ protocol

Adaptive rate error control through the use of diversity com...

引用

MILCOM, Military Communications Conference

作者： S.B. Wicker School of Electrical Engineering Georgia Institute of Technology Atlanta GA USA

The author demonstrates an adaptive rate coding system based on the majority logic decoding of convolutional codes. The proposed system retains the high-data-rate capability of FEC (forward error correction) majority logic decoders while providing an adaptive code rate and a significant improvement in error protection through the incorporation of diversity combining and hybrid-ARQ (automatic repeat request) techniques. It is shown through analysis and simulation that this error control system provides a high level of data reliability at the expense of a minimal reduction in throughput.< >

关键词： Diversity reception Programmable control adaptive control Error correction Decoding Forward error correction adaptive systems Convolutional codes Automatic logic units adaptive coding

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Self organizing map based channel prediction for OFDMA

Self organizing map based channel prediction for OFDMA

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： H.M.S.B. Senevirathna K. Yamashitha Hai Lin Department of Electrical and Electronic Systems Intelligent Information and Communication Research Laboratory Osaka Prefecture University Sakai Osaka Japan

Channel prediction is the key requirement in adaptive transmission techniques such as adaptive modulation, adaptive coding and adaptive power control. The paper presents a novel self organizing map (SOM) based channel predictor for the downlink of an orthogonal frequency-division multiple access (OFDMA) system. The proposed predictor uses a Kalman trained-SOM backed mixtures of experts (ME) modular neural network. The performance of the predictor is evaluated on an OFDMA system with a system delay where channel prediction is needed.

关键词： Organizing Programmable control adaptive control Modulation coding adaptive coding Power control Downlink Kalman filters Neural networks Delay systems

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