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2024 Information Theory Workshop

作者： Deng, Gefeng Jiang, Zhengyi Bai, Bo Zhang, Gong Zhang, Xiuyin Hou, Hanxu South China Univ Technol Sch Elect & Informat Engn Guangzhou Peoples R China Huawei Tech Co Ltd Cent Res Inst Theory Lab 2012 Labs Hong Kong Peoples R China Tsinghua Univ Dept Math Sci Beijing Peoples R China

ISBN: (纸本)9798350348941;9798350348934

Reed-Solomon (RS) codes are widely used in storage systems to ensure data reliability. In this paper, we first propose a new construction of RS codes with between three to five parity symbols over a special finite field of size 256. We show that all the operations involved in the encoding/decoding process can be implemented by XOR and cyclic shift. Second, we present a fast encoding/decoding algorithm for our codes by designing a modified Reed-Muller (RM) transform that has both small computational complexity and space complexity. We show that our codes have much lower space complexity and nearly the same computational complexity, compared with the existing RM-based RS codes. Simulation results demonstrate that our codes improve encoding and decoding throughput by 34.06% and 31.66%, respectively, under evaluated parameters, compared with existing RM-based RS codes.

关键词： Reed-Solomon codes Reed-Muller transform Low space complexity coding algorithm All XOR operation

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Fast Encoding algorithms for Reed-Solomon Codes With Between Four and Seven Parity Symbols

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IEEE TRANSACTIONS ON COMPUTERS 2020年第5期69卷 699-705页

作者： Yu, Leilei Lin, Zhichang Lin, Sian-Jheng Han, Yunghsiang S. Yu, Nenghai Univ Sci & Technol China Sch Informat Sci & Technol Hefei 230026 Peoples R China Dongguan Univ Technol Sch Elect Engn & Intelligentizat Dongguan 523808 Peoples R China

This article describes a fast Reed-Solomon encoding algorithm with four and seven parity symbols in between. First, we show that the syndrome of Reed-Solomon codes can be computed via the Reed-Muller transform. Based on this result, the fast encoding algorithm is then derived. Analysis shows that the proposed approach asymptotically requires 3 XORs per data bit, representing an improvement over previous algorithms. The simulation demonstrates that the performance of the proposed approach improves with the increase of code length and is superior to other methods. In particular, when the parity number is 5, the proposed approach is about two times faster than other cutting-edge methods.

关键词： Reed-Solomon code Reed-Muller transform coding algorithm

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Research on the application of LDPC code in chaotic sequence image encryption

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CLUSTER COMPUTING-THE JOURNAL OF NETWORKS SOFTWARE TOOLS AND APPLICATIONS 2019年第3-Sup期22卷 S6359-S6370页

作者： Wang, Zhong-xun Lou, Yang Wang, Wen-qi Zhang, Min Li, Xiao-lin Yantai Univ Inst Sci & Technol Optoelect Informat Yantai Peoples R China

Low density parity check code (LDPC) is a linear block code whose performance is close to Shannon's limit. Compared with other decoding algorithms, it has low decoding complexity and flexible structure. So it becomes people's research hotspots. In recent years, LDPC code codec algorithm has been improved, and is widely used in deep space communications, optical fiber communications, mobile communications and underwater and other fields. Using chaotic sequence single-layer mapping plus pixel scrambling can complete chaotic image encryption, because some chaotic sequence is poor robust, in the process of channel transmission, it is difficult to ensure that the information can be destroyed after the attack In this paper, LDPC codes are introduced, and in the chaotic image encryption, block coding is used to form error protection to improve the stability of the image transmission process and improve the transmission quality.

关键词： LDPC code Logistic chaotic sequence image encryption coding algorithm Decoding algorithm

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Gaussian channel transmission of images and audio files using cryptcoding

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IET COMMUNICATIONS 2019年第11期13卷 1625-1632页

作者： Bakeva, Verica Popovska-Mitrovikj, Aleksandra Mechkaroska, Daniela Dimitrova, Vesna Jakimovski, Boro Ilievski, Vladimir Ss Cyril & Methodius Univ Skopje Fac Comp Sci & Engn POB 393 Skopje North Macedonia Ecole Polytech Fed Lausanne Lausanne Switzerland

Random codes based on quasigroups (RCBQ) are cryptcodes, i.e. they are error-correcting codes, which provide information security. Cut-Decoding and 4-Sets-Cut-Decoding algorithms for these codes are defined elsewhere. Also, the performance of these codes for the transmission of text messages is investigated elsewhere. In this study, the authors investigate the RCBQ's performance with Cut-Decoding and 4-Sets-Cut-Decoding algorithms for transmission of images and audio files through a Gaussian channel. They compare experimental results for both coding/decoding algorithms and for different values of signal-to-noise ratio. In all experiments, the differences between the transmitted and decoded image or audio file are considered. Experimentally obtained values for bit-error rate and packet error rate and the decoding speed of both algorithms are compared. Also, two filters for enhancing the quality of the images decoded using RCBQ are proposed.

关键词： random codes decoding Gaussian channels error correction codes channel coding error statistics cryptography image coding audio coding 4-sets-cut-decoding algorithms audio files decoded image bit-error rate packet error rate decoding speed Gaussian channel transmission random codes error-correcting codes coding algorithm cryptcoding information security cut-decoding algorithm RCBQ performance quasigroups image files

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A New Network coding Scheme in Two-relay OFDMA Networks

A New Network Coding Scheme in Two-relay OFDMA Networks

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International Standard Conference on Trustworthy Computing and Services (ISCTCS)

作者： Zhao, Hui Chen, Yueyun Yuan, Xiaopan Univ Sci & Technol Beijing Sch Comp & Commun Engn Beijing 100083 Peoples R China

ISBN: (纸本)9783662474013;9783662474006

In orthogonal frequency division multiple access (OFDMA) networks, relay nodes utilize network coding for the received information to improve spectrum efficiency. However, network coding spreads may result in some errors. These bit errors along the relay's transmission, which results in high BER in receivers. To solve the error spread problem, we propose a new coding algorithm called dualism network coding (DNC) algorithm to cripple the spread of error effectively for 2-relay networks. In the proposed algorithm, relay node reuse the bit decoded from the received information for the network coding of next slot. The simulation results show that the proposed algorithm is effective to solve the problem of error propagation effectively.

关键词： Network coding Error propagation coding algorithm

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coding algorithm Based on Loss Compression using Scalar Quantization Switching Technique and Logarithmic Companding

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JOURNAL OF INFORMATION SCIENCE AND ENGINEERING 2010年第3期26卷 967-976页

作者： Peric, Zoran Mosic, Aleksandar Panic, Stefan Univ Nis Dept Telecommun Nish 18000 Serbia

This paper proposes a novel coding algorithm based on loss compression using scalar quantization switching technique. The algorithm of switching is performed by the estimating input variance and further coding with Nonuniform Switched Scalar Compandor (NSSC). An accurate estimation of the input signal variance is needed when finding the best compressor function for a compandor implementation. It enables quantizers to be adapted to the maximal amplitudes of input signals. Additionally, we have discussed the performances of coding schemes designed according to waveform G.711 and G.712 standards and a novel presented codec standard for wideband speech and audio coding. We have pointed out the benefits that can be achieved by using our algorithm: raise of quality and compression. The main contribution of this model is reaching the loss compression through reaching the higher quality of the signal-to-quantization noise ratio (SQNR) in a wide range of signal volumes (variances) with respect to the necessary robustness over a broad range of input variances, and applying possibility for VOIP applications and an effective coding of signals that likewise speech signals follow Gaussian distribution and have the time varying characteristics.

关键词： coding algorithm loss compression nonuniform scalar quantization switching technique logarithmic companding signal-to-quantization-noise-ratio

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A novel coding method for high vividness three-dimensional holographic display

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OPTIK 2014年第2期125卷 724-726页

作者： Leng, Junmin Sang, Xinzhu Yan, Binbin Zhang, Ming Cao, Xuemei Beijing Univ Posts & Telecommun State Key Lab Informat Photon & Opt Commun Beijing 100876 Peoples R China Beijing Informat Sci & Technol Univ Sch Informat & Commun Beijing 100032 Peoples R China

The quality of the reconstructed holographic three-dimensional image is seriously influenced by the noise. A novel encoded algorithm combining the Burch code with the four-step phase shifting method is presented to remove the noise and improve the contrast and resolution of the reconstructed image. The reconstructed three-dimensional images are compared with the results of the median filtering. The performance parameters of two methods are analyzed. The experimental results show that the zero-order light spot, conjugate image and speckle noise are suppressed effectively. The quality of the reconstructed image is noticeably improved. (C) 2013 Elsevier GmbH. All rights reserved.

关键词： Holographic display Computer holography coding algorithm

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Design of a digital circuit for Reed-Solomon coding 6

Design of a digital circuit for Reed-Solomon coding

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6th International Conference on Electronics, Computers and Artificial Intelligence (ECAI)

作者： Baescu, Andrei Dan Stoichescu, Dan Alexandru Florescu, Adriana Univ Politehn Bucuresti ETTI Appl Elect & Informat Engn Bucharest Romania

ISBN: (纸本)9781479954797

This paper proposes a structure for a digital coder, optimizing the multiplication circuit area that leads to a substantial gain in the main circuit surface and helps future decoding. The work describes the functioning process, the technical design and tests the coder's main functions. The evolution of RS coding and the growing pallet of application domains are also briefly covered.

关键词： Reed-Solomon(RS) coding algorithm multiplier type digital coding circuit (coder)

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Improved EZW Compression coding algorithm for Coal Gangue Image

Improved EZW Compression Coding Algorithm for Coal Gangue Im...

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2nd International Congress on Image and Signal Processing

作者： Ma Xian-Min Xian Univ Sci & Technol Coll Elect & Control Engn Xian 710054 Peoples R China

ISBN: (纸本)9781424441303

In the coal gangue automatic selection system, many coal gangue images have been created. It is urgent problem to store and transfer these coal gangue images in real-time processing. An improved embedded zerotree wavelet (EZW) coding algorithm is introduced to compress the coal gangue images in this paper. According to wavelet transform theory, the basic features of wavelet coefficients are analyzed. The zerotrees are divided into the edge tree, texture tree and smoothness tree, and the different coding schemes are applied to these different trees. The low frequency components in the coal gangue images are compressed in lossless, whereas the wavelet coefficients of the high frequency in different directions are processed with the adaptive threshold values. The integer wavelet transform is adopted to keep the higher fidelity in inversion operation. Investigation results show that the proposed algorithm can raise the compression efficiency and gain the higher human vision quality in the reconstructed images.

关键词： EZW coding algorithm zerotrees coal gangue wavelet transform

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A systematic review of validated methods for identifying anaphylaxis, including anaphylactic shock and angioneurotic edema, using administrative and claims data

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PHARMACOEPIDEMIOLOGY AND DRUG SAFETY 2012年第supS1期21卷 240-247页

作者： Schneider, Gary Kachroo, Sumesh Jones, Natalie Crean, Sheila Rotella, Philip Avetisyan, Ruzan Reynolds, Matthew W. United BioSource Corp Epidemiol & Database Analyt Lexington MA 02420 USA

Purpose The Food and Drug Administration'sMini-Sentinel pilot program initially aims to conduct active surveillance to refine safety signals that emerge for marketed medical products. A key facet of this surveillance is to develop and understand the validity of algorithms for identifying health outcomes of interest from administrative and claims data. This article summarizes the process and findings of the algorithm review of anaphylaxis. Methods PubMed and Iowa Drug Information Service searches were conducted to identify citations applicable to the anaphylaxis health outcome of interest. Level 1 abstract reviews and Level 2 full-text reviews were conducted to find articles using administrative and claims data to identify anaphylaxis and including validation estimates of the coding algorithms. Results Our search revealed limited literature focusing on anaphylaxis that provided administrative and claims data-based algorithms and validation estimates. Only four studies identified via literature searches provided validated algorithms;however, two additional studies were identified by Mini-Sentinel collaborators and were incorporated. The International Classification of Diseases, Ninth Revision, codes varied, as did the positive predictive value, depending on the cohort characteristics and the specific codes used to identify anaphylaxis. Conclusions Research needs to be conducted on designing validation studies to test anaphylaxis algorithms and estimating their predictive power, sensitivity, and specificity. Copyright (C) 2012 John Wiley & Sons, Ltd.

关键词： anaphylaxis administrative and claims data Mini-Sentinel coding algorithm

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