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检索条件"主题词=error correction coding"

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BCH Code-Based Robust Audio Watermarking Algorithm in the DWT Domain

BCH Code-Based Robust Audio Watermarking Algorithm in the DW...

引用

2010 International Conference on Intelligent Computation Technology and Automation(2010 智能计算技术与自动化国际会议 ICICTA 2010)

作者： Dongmei WU Shangguo Yang Zuochen WANG Wenhua QIN College of Physics and Engineering Qufu Normal University Qufu Shandong 273165 China

ISBN: (纸本)9781424472796;9780769540771

In this article, a BCH code-based audio watermarking algorithm performed in the discrete wavelet domain is proposed. The watermarking sequence encoded by the BCH technique is embedded in the wavelet coefficient. The technique takes advantage of the error-correction capacity of BCH code to increase the robustness of audio watermarking, consequently diminishes the intensity of watermarking. In addition, a blind watermark detection technique without resorting to the original signal is developed to identify the embedded watermark. Experiment results demonstrate that the watermarked audio has very high perceptual quality, and that the embedded watermark is robust under various types of attacks such as noise, resampling, re-quantiziug ,MP3 encoding ,cutting and etc. by using the proposed technique.

关键词： audio watermarking discrete wavelet transform error correction coding robust BCH code

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Block coding trade-offs for mobile radio channels

Block coding trade-offs for mobile radio channels

引用

Third IEE Conference on Telecommunications 1991

作者： M.L. Bergman P.G. Farrell Ferranti International University of Manchester Institute of Science and Technology UK

Considers the burst-error characterisation of a mobile radio digital communication channel, and with suggestions for error-control coding techniques that can be employed on a channel where errors occur in bursts. Two measures which help characterize a bursty channel are introduced: burst correlation which provides a means of ascertaining the lengths of bursts occurring; and burst concentration, which quantifies the number of bursts occurring in a given size of coding block. These two measures help a code designer to select an appropriate coding technique for the bursty channel, and to determine a suitable degree of bit or burst (symbol or character) interleaving. The paper concentrates on the relative performance of various coding-interleaving schemes and on the effect of varying the parameters of each scheme.< >

关键词： Correlation Digital radio Encoding error correction coding Communication channels

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Improving automatic link establishment through a new soft decision trellis decoder for the (24,12) Golay code

Improving automatic link establishment through a new soft de...

引用

1994 Sixth International Conference on HF Radio Systems and Techniques

作者： B. Honary B. Hunt M. Maundrell Lancaster University UK Defence Research Agency UK

Automatic link establishment (ALE) is the term used to describe systems where the functions of encoding and decoding, modulation and demodulation, frequency management, and system control ate co-ordinated by the system during the start-up and transmission phases of communications. The US MILSTD-188-141A is currently the major standard addressing the subject of ALE. It defines a channel selection procedure, control protocol, and data transport to allow non-adaptive ALE. The MILSTD-188-141A uses a fixed 8 frequency shift keying modulation scheme, and the (24,12) extended Golay code. Under certain conditions this will not be sufficient to allow error free transmission of data. One way to combat this would be to use a more robust error correcting code, but this would no longer adhere to the standard, and would reduce the data throughput. As the standard does not specify a decoding method for the Golay code, an alternative way to improve the performance of the standard is to use a more effective decoding technique. This paper describes a new maximum likelihood trellis decoder for the (24,12) Golay code.< >

关键词： Decoding Encoding error correction coding Frequency shift keying Maximum likelihood estimation Communication standards Trellis codes

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Dual diversity versus simple block coding for correlated frequency-selective fading channels

Dual diversity versus simple block coding for correlated fre...

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Abu-Dayya Beaulieu Department of Electrical Engineering Queen's University Kingston ONT Canada

In addition to diversity, forward error correction (FEC) coding is a well-known method that can be used to improve the performance of communication on wireless fading channels. In this paper, we investigate the performance of combined diversity and FEC coding strategies. For block coding to be effective, bit errors in each code word should be independent. To render the channel memoryless, perfect bit interleaving is assumed. That is, bit errors in the code word are assumed to be independent. In this paper, we analyze the performance of M-ary differential phase shift keying (MDPSK) on frequency-selective Rayleigh fading channels using two branch postdetection equal gain (EG) combining. Both the effects of correlation between the two diversity branches and the effects of cochannel interference on the BER performance are investigated. The interferers are assumed to be MDPSK modulated signals with same symbol rate as that of the desired signal, but with random symbol timing offsets relative to the desired signal. The cochannel interference contribution is represented by a Gaussian noise whose mean and variance are equal to the mean and variance of the sum of the interfering signals.< >

关键词： Fading channels Land mobile radio diversity systems Cochannel interference Differential phase shift keying Forward error correction Interleaved coding Block codes Rayleigh channels Correlation Gaussian noise error analysis error correction coding Memoryless systems

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A comparison of block code performance for mobile radio channels: trade-offs between block length interleaving depth and type

A comparison of block code performance for mobile radio chan...

引用

IEE Colloquium on University Research in Mobile Radio

作者： M.L. Bergman P.G. Farrell Ferranti International Public Limited Company Manchester UK Department of Electrical Engineering University of Manchester Institute of Science and Technology UK

The results reported in this contribution form part of a study of burst-error channels. The study was based on error records derived from a hardware Rayleigh fading simulator designed to model the 900 MHz mobile radio channel (S.H. Razavi (1988)). Digital transmission over fading communication media like the mobile radio channel is particularly prone to disruption by bursty (nonrandom or clustered) error patterns. The study was concerned with the characterisation of burst-error channels and an assessment of the performance of various block error-control coding techniques designed to combat error bursts. Since the study covered a wide range of concepts and techniques, and produced a large number of results, the author concentrates on the concept of burst interleaving and its performance compared to that of bit interleaving.< >

关键词： error correction coding Communication channels

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Multi-rate coding: a strategy for error control in mobile communication systems

Multi-rate coding: a strategy for error control in mobile co...

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IEE Colloquium on Low Bit-Rate Speech coding for Future Applications

作者： S.A. Atungsiri A.M. Kondoz B.G. Evans Satellite Engineering Research (CSER) University of Surrey Guildford Surrey UK

The mobile and personal communication systems (PCS) revolution is well underway. The major requirement of spectral efficiency in these systems often means the use of low bit rate speech and channel coders, rampant carrier frequency reuse with its associated problem of co-channel interference. The authors propose the use of multi-rate speech and channel codecs in future PCS to control the excessive channel degradations that arise from such interference.< >

关键词： Codecs Encoding error correction coding Personal communication networks Speech coding

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An error-correcting IEEE-488 bus system

An error-correcting IEEE-488 bus system

引用

IEE Colloquium on Buses for Instruments: VXI and Beyond

作者： S.L. Webb Automatic Test Equipment Division GEC Avionics Limited Rochester USA

A single bus transfer error can cause a system crash or test failure, and with test execution times of the order of minutes for very complex test subjects, such an event is significant in terms of time and cost. Ideally bus transfers should be carried out as fast as possible and with inbuilt data integrity. A clear case exists for remodelling the current IEEE-488 specification to increase the data highway from eight to sixteen bits, with data integrity being provided via a suitable error-correcting code system.< >

关键词： Computer interfaces error correction coding Standards

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引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Abu-Dayya Beaulieu Department of Electrical Engineering Queen's University Kingston ONT Canada

Forward error correction (FEC) coding is a well-known method that can be used to improve the performance of communication on wireless fading channels. The authors investigate the performance of combined diversity and FEC coding strategies. For block coding to be effective, bit errors in each code word should be independent. To render the channel memoryless, perfect bit interleaving is assumed. That is, bit errors in the code word are assumed to be independent. The authors analyze the performance of MDPSK on frequency-selective Rayleigh fading channels using two branch postdetection equal gain (EG) combining. Both the effects of correlation between the two diversity branches and the effects of cochannel interference on the BER performance are investigated. The interferers are assumed to be MDPSK modulated signals with same symbol rate as that of the desired signal, but with random symbol timing offsets relative to the desired signal. The cochannel interference contribution is represented by a Gaussian noise whose mean and variance are equal to the mean and variance of the sum of the interfering signals.< >

关键词： Cochannel interference Land mobile radio diversity systems Block codes Time-varying channels Fading channels Forward error correction error correction coding Memoryless systems Differential phase shift keying Rayleigh channels error analysis Gaussian noise

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Spectral shaping codes co-channel interference suppression

Spectral shaping codes co-channel interference suppression

引用

1991 Fifth International Conference on HF Radio Systems and Techniques

作者： B. Honary M. Darnell T. Ng G. Markarian University of Warwick UK University of Hull UK Radio Physics and Electronics Institute Russia

A block coding algorithm called the spectral-shaping code (SSC) is introduced for the purposes of interference suppression in HF communication systems. The SSC code will effectively suppress DC and other unwanted frequency components in the baseband single whilst being much less complex than say adaptive antenna techniques. First, the condition for obtaining a DC spectral null is given, then the condition for obtaining a null at other values of frequency is derived. Finally, the method of obtaining the corresponding codeword by solving a set of linear equations is presented.< >

关键词： Encoding error correction coding Interference suppression Electromagnetic radiative interference Communication channels

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A Simple Parity Check Matrix LDPC Code for Perpendicular Magnetic Recording Channels

A Simple Parity Check Matrix LDPC Code for Perpendicular Mag...

引用

International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology

作者： Sekson Timakul Somsak Choochuay College of Data Storage Technology and Applications King Mongkut's Institute of Technology Ladkrabang Bangkok 10520 Thailand Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok 10520 Thailand

ISBN: (纸本)9781479905461

In LDPC code design, the structure of code's parity check matrix can be very crucial to code performance. In this paper, we have investigated a simple designed parity check matrix when the code is applied to a PMR channel of a storage system. Belief propagation algorithm and min-sum algorithm are two major decoding algorithms used to benchmarked the code's merits. Additive white Gaussian noise channel (AWGN) and perpendicular magnetic recording (PMR) channel with SISO equalizer in PR2 target are the conditions of our investigation. The LDPC code itself is a modified array type. Its construction fairly simple compared to normal array and quasi-cyclic code. We used two decision variables to define the permutation matrix. A method proposed by Tanner's *** had been adapted to the modified array code. The decoders have been tested for 5 and 20. iterations. SNR versus BER and BLER were measured.

关键词： error correction coding LDPC codes min-sum decoding iterative decoding magnetic recording

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