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检索条件"主题词=error correction coding"

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Effect of dispersive fading channels on block coded modulation (mobile radio)

Effect of dispersive fading channels on block coded modulati...

引用

1991 Sixth International Conference on Mobile Radio and Personal Communications

作者： A.G. Burr J.P. Thorlby University of York UK

Considers the effect of the mobile radio propagation environment on the distance structure of a block coded modulation scheme and discusses the implications on bit error rate performance. It is assumed that ideal equalisation is implemented, so that the combination of equaliser and decoder forms a maximum likelihood decoder for the code as transformed by the channel. Simulation results are presented showing how the distance structure changes in different channels.< >

关键词： error correction coding error analysis Fading channels Phase shift keying Communication channels

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A neural network implementation suitable for correlation decoding of some block codes

A neural network implementation suitable for correlation dec...

引用

IEE Colloquium on General-Purpose Signal-Processing Devices

作者： M. Sabry D. Grant J.E. Midwinter J.T. Taylor Department of Electronic and Electrical Engineering University College London UK

Algorithms for the decoding and error correction of codes such as the Hamming and Golay codes are well established. They are generally implemented using either general purpose or dedicated microprocessor systems. Designers of such systems continually seek faster devices that retain flexibility and ease of use. As a consequence some researchers have proposed theoretical systems based on artificial neural network (ANN) architectures for the implementation of decoding algorithms. The authors present a practical proposal for the realisation of an ideal correlation decoder based on an analogue binary associative memory network (BAMNET) ANN prototype, which has been developed and manufactured in a 2.4 mu m CMOS technology for rapid pattern recognition.< >

关键词： Block codes CMOS integrated circuits Correlation Encoding error correction coding Hamming codes Neural networks Pattern recognition

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Efficient channel coding and interleaving schemes for mobile radio communications

Efficient channel coding and interleaving schemes for mobile...

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IEE Colloquium on Microcellular Mobile Radio

作者： L. Hanzo K.H.H. Wong R. Steele Department of Electronics and Computer Science University of Southampton UK Dept. of Electron. & Comput. Sci. Southampton Univ. UK

Motivated by the increasing demand for high quality, robust yet bandwidth efficient data and speech communications in the hostile mobile radio environment the authors embarked on the comparative study of a number of multilayer forward error correction (FEC) and interleaving scenarios. The basic attributes of speech and data communication channels are entirely different. Speech transmission channels must not have long coding delays, but their bit error rates (BER) are allowed to be higher than those for data transmission. However, the higher data integrity required for data transmission can be achieved by deploying longer coding/interleaving delays, which are tolerated in this application. To limit the plurality of scenarios and system parameters to a manageable number we suppose an overall coding rate of one half. They postulate the memorylength of speech channels to be around 450 bits, while that of data channels to be around five times as long, i.e. 2500 bits.< >

关键词： error correction coding

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Multilevel modulation and coding for indoor radio channels

Multilevel modulation and coding for indoor radio channels

引用

IEE Colloquium on Radio LANs and MANs

作者： A.G. Burr Department of Electronics University of York

The indoor radio channel provides the essential physical transmission medium for the implementation of radio LANs. We consider two alternative techniques for the mitigation of intersymbol interference due to multipath on indoor radio channels: the use of narrower signalling pulses (duty cycle less than 100%), and the use of FEC coding. Using the GWSSUS channel model, and assuming an exponential power-delay profile, the effect of intersymbol interference on the irreducible BER is calculated for both techniques, both for Rayleigh fading, and for a non-fading line-of-sight path. In the non-fading case, narrowing the signalling pulse is more effective than coding, but less robust in the presence of thermal noise, while in the fading case coding is more effective. The appropriate technique allows a maximum data rate, normalised to 1/(delay spread), of 0.62 in the non-fading case and 0.32 in Rayleigh fading, for irreducible BER 10/sup -6/.

关键词： Delay effects error correction coding error analysis Fading channels Forward error correction Indoor radio communication Intersymbol interference Modulation Multipath channels Rayleigh channels Communication system signaling Wireless LAN

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Combined channel coding and concealment

Combined channel coding and concealment

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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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Performance of sequential detection schemes for trellis-encoded data signals distorted by intersymbol interference

Performance of sequential detection schemes for trellis-enco...

引用

1991 Sixth International Conference on Digital Processing of Signals in Communications

作者： D. Bauer H. Speer C.M. Zhao University of Kaiserslautern Germany

The authors propose the use of a sequential detection scheme for the combined equaliser/decoder trellis. They deal with the generalised stack algorithm (GSA). They investigate the GSA for trellis coded modulation data signals and compare it with the reduced state sequence estimator (RSSE) method. For the simulations, Ungerboeck codes were used. The aim of the study was to examine data transmission over typical band limited telephone channels having passband responses between 300 and 3400 Hz.< >

关键词： Data communication Encoding error correction coding Intersymbol interference Modulation Signal detection Communication channels Telephony

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Proceedings ITCC 2003. International Conference on Information Technology: coding and Computing

Proceedings ITCC 2003. International Conference on Informati...

引用

International Conference on Information Technology: coding and Computing (ITCC)

The following topics are dealt with: information technology and education; Web/information retrieval; document management/text compression; coding/error control; mobile commerce - enabling technologies; networks; video processing; modern Web and hypermedia systems; wavelets; image processing; watermarking/image compression; Internet/mobile networking; and data handling and management.

关键词： Information technology error correction coding Internet Data handling Data compression Image coding Document handling Video coding Wavelet transforms Hypertext systems Computer science education

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Computer simulation for performance evaluation in HF radio links: system and coding schemes optimization

Computer simulation for performance evaluation in HF radio l...

引用

1991 Fifth International Conference on HF Radio Systems and Techniques

作者： A. Bernardini M. Bernesi R. Pattuelli P. Snidero La Sapienza University of Rome Italy Rome Univ. Italy

The authors studied a dedicated simulation procedure when faced with the problem of comparing performances among different types of coding schemes to be employed in an HF radio link of known characteristics. They report on the main modelling and analysis techniques used to this end, and examine some of the results obtained. Sample results are given for a simulated 4-PSK system with BCH coding.< >

关键词： Simulation error correction coding Optimization methods Phase shift keying Communication system software

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Algorithm implementation examples for digital cellular communication

Algorithm implementation examples for digital cellular commu...

引用

IEE Colloquium on Personal Communications: Circuits, Systems and Technology

作者： C.G. Louisson AT and T Microelectronics Bracknell Berkshire UK

This paper presents four examples of the implementation of the digital signal processing algorithms found in modem mobile communication systems. Specifically, some of the high processing overhead algorithms from the North American IS54 cellular telephony standard are examined for an understanding of their functional requirements. The four algorithms, VSELP codebook search, VSELP 10 pole filter, FEC convolutional encoder and FEC Viterbi trellis decoder, are presented from an applications programmer's view, with discussion of algorithmic techniques and architectural requirements.< >

关键词： Land mobile radio cellular systems Communication standards Codes Convolutional codes Digital radio error correction coding Signal processing Trellis codes

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An adaptive half duplex data transmission FEC/ARQ procedure: results on real HF ionospheric channel

An adaptive half duplex data transmission FEC/ARQ procedure:...

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1994 Sixth International Conference on HF Radio Systems and Techniques

作者： D. Merel D. Pirez RGS Divison Thomson CSF France

An automatic data rate adaptation is described for HF modems in degraded ionospheric propagation conditions by associating rate compatible punctured codes with a dedicated automatic repeat request procedure. Real transmission of data files with a 3 kHz high rate modem is up to 2.6 kb/s automatically accorded with the channel capacity. TCM codes may extend throughput up to 3.8 kb/s with the same ARQ procedure.< >

关键词： Adaptive systems Information rates Convolutional codes Data communication error correction coding Modulation Phase shift keying Protocols Reed-Solomon codes Trellis codes

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