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检索条件"主题词=error correction coding"

共 278 条记录，以下是181-190 订阅

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MMSE and ML estimation of chaotic sequences with coded signs with applications in coding discrete-time analog signals

MMSE and ML estimation of chaotic sequences with coded signs...

引用

33rd IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Rosenhouse, Isaac Weiss, Anthony J. Tel Aviv Univ Sch Engn IL-69978 Tel Aviv Israel

ISBN: (纸本)9781424414833

We consider estimation of a set of tent-map chaotic sequences. These sequences are obtained by iterating a one dimensional chaotic function in the (-1,1) domain. We demonstrate how to construct a set of n sequences, in which information in the form of n arbitrary samples in the (-1,1) domain is embedded. Additionally the signs of all sequences jointly form a valid digital codeword. Each sequence in the set consists of m elements, hence the set of sequences is equivalent to a rate 1/m analog error correcting-code. We present performance in terms of coding gain when maximum likelihood (ML) and minimum-mean-square-error (MMSE) estimation approaches are employed.

关键词： chaos error correction coding estimation communication system signaling

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An efficient biocryptosystem based on the iris biometrics

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2nd IEEE Pacific Rim Symposium on Video and Technology

作者： Bakhtiari, Ali Shojaee Shirazi, Ali Asghar Beheshti Zamanlooy, Babak Iran Univ Sci & Technol Dept Elect Engn Tehran 16846 Iran

ISBN: (纸本)9783540771289

A new and efficient method for combining iris biometrics with custom cryptographic schemes to obtain an efficient biocryptosystem is proposed in this paper. Though the method structure is basically derived from a previously described biocryptosystern scheme, the introduction of new image processing methods alongside with efficient utilization of traditional methods show promising developments compared with the previous biocryposystem especially in the field of generating longer cryptographic key strings while keeping the system quality.

关键词： authentication system biocryptosystem error correction coding iris segmentation

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IMPACT OF ROUNDOFF error ON THE DECISIONS OF THE LOG SUM-PRODUCT ALGORITHM FOR LDPC DEcoding

IMPACT OF ROUNDOFF ERROR ON THE DECISIONS OF THE LOG SUM-PRO...

引用

IEEE Workshop on Signal Processing Systems

作者： Kanistras, N. Paliouras, V. Univ Patras Comp Engn & Informat Dept Patras 26500 Greece Univ Patras Dept Elect & Comp Engn Patras 26500 Greece

ISBN: (纸本)9781424429233

In this paper the impact of the roundoff error on the decisions taken by the Log Sum-Product LDPC decoding algorithm is studied. The mechanism, by means of which roundoff alters the decisions of a finite word length implementation of the algorithm compared to the infinite precision case, is analyzed and a corresponding theoretical model is developed. Experimental results prove the validity of the proposed model.

关键词： Low-density parity-check (LDPC) codes finite wordlength effects error correction coding

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A Modified Min Sum Decoding Algorithm based on Approximation Enhancement for LDPC Codes 11

A Modified Min Sum Decoding Algorithm based on Approximation...

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11th International Conference on Information and Communication Technology Convergence (ICTC) - Data, Network, and AI in the age of Untact (ICTC)

作者： Kim, Nam-Il Lee, Seung-Que Kim, Jin-Up ETRI Commun & Media Res Lab Daejeon South Korea

ISBN: (纸本)9781728167589

Min-sum algorithm(MSA) and its modification are used in LDPC decoder implementations because of its error performance and low computation complexity. In this paper a modified min-sum LDPC decoding algorithm through approximation enhancement using the smallest three minimum values is presented. The proposed algorithm improves error performance and reduces decoder iterations. From the simulation results for 5G NR LDPC codes, we show that the proposed algorithm can achieve about 1.6dB improvement of FER compared to the min-sum decoding algorithm and provide about 10% reduction of the average iteration numbers compare to NMSA with optimum normalization factor.

关键词： error correction coding LDPC codes Minimum Sum Decoder Approximation Enhancement

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A novel feature-based robust audio watermarking for copyright protection

A novel feature-based robust audio watermarking for copyrigh...

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International Conference on Information Technology - coding and Computing

作者： Li, W Xue, XY Li, XQ Lu, PZ Fudan Univ Dept Comp Sci & Engn Shanghai 200433 Peoples R China

ISBN: (纸本)0769519164

A novel public audio watermarking scheme based on the statistical feature manipulation in wavelet domain combined with error correction coding technique is proposed in this paper. The algorithm is shown to be rather robust against a variety of common signal processing manipulations and synchronization attacks including the very challenging random cropping and time scale modifications. The watermarked audio has very high perceptual quality and is indistinguishable from the original signal. A blind watermark detection technique without resorting to the original signal is developed to identify the embedded watermark under various types of attacks. Security is guaranteed by applying chaotic sequence during embedding and detection. Several meaningful suggestions on how to use error correction coding technique to improve the robustness are given at the end.

关键词： digital audio watermarking discrete wavelet transform statistical feature manipulation chaos error correction coding synchronization attack

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A Joint coding-Precoding Scheme for OFDM Systems over Fading Channels

A Joint Coding-Precoding Scheme for OFDM Systems over Fading...

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69th IEEE Vehicular Technology Conference

作者： Ortin, Jorge Garcia, Paloma Gutierrez, Fernando Valdovinos, Antonio Univ Zaragoza Aragon Inst Engn Res Zaragoza 50018 Spain

ISBN: (纸本)9781424425167

In this work we analyse the performance of a joint coding-precoding scheme for OFDM systems over fading channels. The design of the precoder is based on the information redistribution of the input modulated symbols amongst all the output precoded symbols. The proposed precoder decreases the variance of the instantaneous noise power at the receiver produced by the channel variability. In this sense, the noise at the output of the receiver deprecoding block can be considered as gaussian causing an improvement in the performance of the channel coding scheme employed in the system. The proposed system is evaluated under realistic radio channels which present multipath frequency-selective fadings and are affected by Doppler spread.

关键词： OFDM precoded OFDM precoder Zero Forcing convolutional codes error correction coding

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Babel Storage: Uncoordinated Content Delivery from Multiple Coded Storage Systems

Babel Storage: Uncoordinated Content Delivery from Multiple ...

引用

IEEE Global Communications Conference (IEEE GLOBECOM)

作者： Neu, Joachim Medard, Muriel Stanford Univ Stanford CA 94305 USA MIT 77 Massachusetts Ave Cambridge MA 02139 USA

ISBN: (纸本)9781728109626

In future content-centric networks, content is identified independently of its location. From an end-user's perspective, individual storage systems dissolve into a seemingly omnipresent structureless `storage fog'. Content should be delivered oblivious of the network topology, using multiple storage systems simultaneously, and at minimal coordination overhead. Prior works have addressed the advantages of error correction coding for distributed storage and content delivery separately. This work takes a comprehensive approach to highlighting the tradeoff between storage overhead and transmission overhead in uncoordinated content delivery from multiple coded storage systems. Our contribution is twofold. First, we characterize the tradeoff between storage and transmission overhead when all participating storage systems employ the same code. Second, we show that the resulting stark inefficiencies can be avoided when storage systems use diverse codes. What is more, such code diversity is not just technically desirable, but presumably will be the reality in the increasingly heterogeneous networks of the future. To this end, we show that a mix of Reed-Solomon, low-density paritycheck and random linear network codes achieves close-to-optimal performance at minimal coordination and operational overhead.

关键词： error correction coding content-centric networks distributed storage content delivery

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CONTENT-BASED BLIND COMPENSATION AND SHAPING FOR STREAMING VIDEO

CONTENT-BASED BLIND COMPENSATION AND SHAPING FOR STREAMING V...

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22nd IEEE Canadian Conference on Electrical and Computer Engineering

作者： Huang, Jun Lawal, Funmilayo Jin, Lei Yang, Oliver Univ Ottawa Comp Commun Network Res Lab Ottawa ON K1N 6N5 Canada

ISBN: (纸本)9781424435098

This paper studies video streaming system over a wireless medium. The major challenge is to provide a robust link along the transmission/transport path and most importantly through noisy channels/networks that could add or drop bytes by unforeseeable factors. As a remedy for this phenomenon, we combine forward error correction, blind compensation and traffic shaping to improve the over all performance. We report on the experiments on this unique performance improvement method. The results of our study can find applications in WiMax and AVCP.

关键词： Wireless Network error correction coding Video/Image Signal Processing Traffic Control (Communication) Pre/Post Process Algorithms

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LOW-FREQUENCY SUPPRESSION IN RLL CODES FOR OPTICAL-RECORDING

LOW-FREQUENCY SUPPRESSION IN RLL CODES FOR OPTICAL-RECORDING

引用

8TH INTERNATIONAL CONF ON VIDEO, AUDIO AND DATA RECORDING

作者： MATTAVELLI, M Philips Research Laboratories Netherlands

ISBN: (纸本)0852963971

New demanding applications of write-once and erasable optical media for video and data storage, put high constraints on the signal-to-noise ratio in the servo loops and require channel codes with improved low-frequency characteristics. New run length limited (RLL) block codes for optical recording with higher suppression of the low-frequency components are presented. These result from new criteria and design features in the choice of the alphabet of the codewords, in the algorithms for the minimization of the low-frequency contents and in the merging procedure. Results of the spectra calculation according to the described design have shown very good improvements in the low-frequency contents of the EFM code. Other results of optimized d=2 codes, suitable for optical recording applications are reported.< >

关键词： error correction coding Optical memories

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Generalization of Signal Point Target Code

Generalization of Signal Point Target Code

引用

作者： Billah, Md Munibun Utah State University

学位级别：M.S.

Detecting and correcting errors occurring in the transmitted data through a channel is a task of great importance in digital communication. In error correction coding (ECC), some redundant data is added with the original data while transmitting. By exploiting the properties of the redundant data, the errors occurring in the data from the transmission can be detected and corrected. In this thesis, a new coding algorithm named Signal Point Target Code has been studied and various properties of the proposed code have been extended. Signal Point Target Code (SPTC) uses a predefined shape within a given signal constellation to generate a parity symbol. In this thesis, the relation between the employed shape and the performance of the proposed code have been studied and an extension of the SPTC are presented. This research presents simulation results to compare the performances of the proposed codes. The results have been simulated using different programming languages, and a comparison between those programming languages is provided. The performance of the codes are analyzed and possible future research areas have been indicated.

关键词： error correction coding Trellis Coded Modulation Viterbi Algorithm QPSK QAM Electrical and Computer Engineering

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