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检索条件"主题词=error detection coding"

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Enhancing the error detection capabilities of DCT based codecs using compressed domain dissimilarity metrics

Enhancing the error detection capabilities of DCT based code...

引用

International Conference on Computer as a Tool (EUROCON 2007)

作者： Farrugia, Reuben A. Debono, Carl J. Univ Malta Dept Commun & Comp Engn Msida Msd 2080 Malta

ISBN: (纸本)9781424408122

Video compression standards are implemented in wireless data transmission technologies to provide multimedia services efficiently. These compression standards generally utilize the Discrete Cosine Transform (DCT) in conjunction with variable length codes (VLC) in order to achieve the required high compression ratios. While providing the necessary high data rates, this technique has the disadvantage of making the system more susceptible to transmission errors. The standard decoders do not manage to detect a large number of corrupted macroblocks, 40.54% not detected for H.263+, contributing to a significant reduction in the end-to-end video quality as perceived by the end-user. This paper presents three dissimilarity metrics which contain both color and texture information and that can be extracted directly from the compressed DCT coefficients. These metrics can be used to enhance the error-detection capabilities of standard DCT based codecs. Simulation results show that the proposed algorithm increases the error detection rate by 54.06% with a gain in peak signal-to-noise ratio (PSNR) of 3.21 dB. This improvement in performance is superior to other solutions found in literature.

关键词： error detection coding quality assurance video codecs video signal processing

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A 140 Mbit/s optical fibre digital line system employing a 5B6B line code with extended auxiliary channel capacity

A 140 Mbit/s optical fibre digital line system employing a 5...

引用

Third IEE Conference on Telecommunications 1991

作者： R.D. Gwynn R.M. Dorward GEC Plessey Telecommunications Limited UK

A 140 Mbit/s optical line system is proposed which will not only satisfy the emerging tie line requirement but which will also be capable of adaptation for long haul systems to allow replacement of the older equipment. Results from prototype testing have shown that all of the design parameters for both the line code and the remainder of the system have been achieved with adequate margins.< >

关键词： Information rates Digital communication error detection coding

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A hand-off algorithm for cellular radio based on Reed-Solomon coding

A hand-off algorithm for cellular radio based on Reed-Solomo...

引用

IEE Colloquium on Mobile Radio Networks

作者： M.A. Bennett R. Steele Southampton Univ. UK

An algorithm for switching communications between a mobile station and two adjacent base stations is investigated. The hand-off algorithm is based on the symbol error rate measured by a Reed-Solomon (RS) coder. Simulations based on SBC speech, RS coding, MSK modulation, and the Hata propagation path loss model, show how hand-off can be used as a form of diversity reception with the effective BER varying as a function of the number of hand-offs.< >

关键词： Land mobile radio cellular systems Encoding error correction coding error detection coding

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Effects of errors and error recovery in images compressed by the JPEG still image compression standard algorithm

Effects of errors and error recovery in images compressed by...

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Petsalis Soleymani Swamy Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada SPAR Aerospace Limited Concord CA USA

The use of the variable-length coding in the final stage of image compression using JPEG makes the image more sensitive to channel errors and can have severe effects on the viewed image. This is due to loss of synchronization in the decoder. Even one bit error can propagate significantly throughout the image. In the past, some techniques have been proposed for resynchronizing Huffman decoders using special synchronizing codewords. The JPEG standard itself allows the use of a special restart marker to help decoder resynchronization. It does not, however, give any guidelines for error recovery. We first describe the most probable types of errors that occur in a JPEG data stream. We focus on techniques and algorithms for detecting the occurrence of a particular error and then for locating that error. One technique functions at the entropy encoding level by taking advantage of the specific data structure of the JPEG stream and using alternately two different end-of-block characters. Others function at the DCT coefficient level or at the pixel level, detecting unlikely patterns that are produced due to errors. We compare different methods and finally propose the most effective method for error detection and image correction.< >

关键词： Image coding Data compression Variable length codes error detection coding error correction coding Communication standards Algorithms Huffman codes Decoding Entropy codes Discrete cosine transforms Transform coding

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Synchronisation aspects in packet transmission

Synchronisation aspects in packet transmission

引用

IEE Colloquium on New Synchronisation Techniques for Radio Systems

作者： A.J. Han Vinck Institute for Experimental Mathematics University of Essen Essen Germany

Considers synchronisation and error detection problems in packet transmission. Especially, the authors investigate the problem of the determination of beginning and ending of packets. Generally, one uses a prefix of the form 01111110. By using symbol insertion, one avoids the occurrence of the same pattern in the data stream. At the receiver one applies the inverse operation. Symbol insertion or bit-stuffing is a simple but not very efficient method. The authors discuss several alternatives for this "standard" method and compare the relative efficiencies and complexities of implementation.

关键词： Synchronization error detection coding Cyclic codes Data communication Packet switching Variable length codes

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Combined channel coding and concealment

Combined channel coding and concealment

引用

IEE Colloquium on Terrestrial DAB - Where is it Going?

作者： G. Plenge C. Weck D. Wiese Institut für Rundfunktechnik GmbH Munich Germany

The authors discuss combined channel coding and error concealment schemes for digital audio broadcasting (DAB). Comparison of two coding schemes showed that the robustness against hostile reception conditions of a digital broadcast transmission can effectively be increased by applying unequal protection (UEP) and a simple concealment of residual bit errors (muting and repetition of some scalefactors).< >

关键词： Digital radio Encoding error correction coding error detection coding Radio broadcasting

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Using FFT for error correction decoders

Using FFT for error correction decoders

引用

IEE Colloquium on DSP Applications in Communication Systems

作者： F. Marvasti M. Nafie Department of Electronic and Electrical Engineering King''s College London UK

The discrete Fourier transform (DFT) is used for error detection and correction. An iterative decoder is proposed for erasure and impulsive noise which also works with moderate amount of additive random noise. The iterative method is very simple and efficient consisting of modules of fast Fourier transforms (FFT) and inverse FFTs. This iterative decoder can be implemented in a feedback configuration. The authors are working on a DSP implementation of this technique.< >

关键词： Decoding error correction coding error detection coding Discrete Fourier transforms Iterative methods

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error detecting runlength-limited sequences

Error detecting runlength-limited sequences

引用

1990 Eighth International Conference on Video, Audio and Data Recording

作者： K.A. Schouhamer Immink Philips Research Laboratories Netherlands

Codes based on runlength-limited sequences are the state of the art corner stone of current disk recorders, whether their nature is magnetic or optical. The error detecting or correcting capabilities of runlength limited sequences are quite poor. In this paper, the author presents an algebraic approach for constructing runlength-limited block codes of fixed codeword length that impart some error detecting capabilities.< >

关键词： error detection coding Magnetic disk recording Optical memories

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Idempotent AN codes

Idempotent AN codes

引用

IEE Colloquium on Signal Processing Applications of Finite Field Mathematics

作者： I.K. Proudler Royal Signals and Radar Establishment Worcestershire UK

An approach to fault-tolerant computing in general and digital signal processing in particular is that of arithmetic error-detecting/correcting codes. These codes were designed to commute with the addition operator and the theory is extensive. In digital signal processing applications the bulk of the arithmetic is addition and multiplication, it is therefore interesting to look for codes that commute with both addition and multiplication. It is shown that such a code does in fact exist; an AN code where the code generator A is an idempotent i.e. A/sup 2/=A. This code, unfortunately, has a serious deficiency in that errors can be masked by a fault-free multiplier. Thus no single (non-separate) code is suitable for both addition and multiplication. Motivated by this problem and the fact that AN codes were designed around the addition operator, the characteristics of a code that commutes with multiplication are discussed. A simple code that satisfies these requirements is presented: an AN+B code. The results of some computer simulations of an AN+B coded multiplier are given.< >

关键词： Simulation error correction coding error detection coding Computer fault tolerance Multiplying circuits

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An adaptive HF system and its computerized performance evaluation

An adaptive HF system and its computerized performance evalu...

引用

1988 Fourth International Conference on HF Radio Systems and Techniques

作者： S. Weizer D. Almer C3I Division Tadiran Limited Israel

Presents the principal requirements from a modern adaptive HF communication system, the basic design concepts of the implemented system which successfully answers these requirements, the accompanying field trial methodology and briefly, some of the field trials results. The basic lesson learned from the implementation and the field trials of the described system is that a modern HF communication system can fulfil the current and future requirements of C3I systems only if it glues together a number of technical features including self-healing architecture, automatic digital operation, real time, adaptive frequency management, HF oriented error detection and correction codes and communication protocols. ALE, LQA and simple and efficient man-machine interfaces. A mandatory phase is developing such systems is the field trials which should be performed with computer aid, using appropriate methodology and tools.< >

关键词： Adaptive systems Command and control systems Computer aided analysis error correction coding error detection coding Protocols Real time systems

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