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作者： Tuntoolavest, Usana PennState University Libraries

学位级别：Doctor of Philosophy

Vector Symbol Decoding (VSD) with list of alternative vector symbol choices is presented as a relatively simple and high performance decoding technique for convolutional outer codes. The convolutional VSD technique has the advantage over the block VSD technique in that most corrections are almost immediate based on observation of only one or a few syndromes. The list decoding also improves the performance and often simplifies the decoding. One main assumption of VSD is that the error symbols are linearly independent, which usually is true for large symbol size. The performance of VSD is compared to the Reed-Solomon code decoding for various types of inner codes and channel conditions. Interleaved Reed-Solomon codes are also considered. The decoding failure probability of VSD is evaluated by both analytically approach to find the upper bound and computer simulation approach to find the exact probability. The upper bound is shown to be extremely close to the simulation result. The decoding failure probability of VSD is considerably lower than the Reed-Solomon code in most cases.

关键词： Vector Symbol decoding convolutional code nonbinary code concatenated code Reed-Solomon code nonbinary code decoding

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HIGH-RATE BINARY COSET code USED FOR INNER code

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 1995年第9期E78A卷 1071-1076页

作者： WADAYAMA, T WAKASUGI, K KASAHARA, M Okayama Prefectural Univ Soja-shi Japan

High rate binary coset codes are investigated. The binary coset (BC) code is a binary convolutional code with parallel path. In our previous research of concatenated trellis-coded modulation (TCM) scheme, we have found that the effective minimum distance of inner code is more important than the minimum free distance when TCM is used as inner code. In this paper, for inner code, we construct the high rate BC codes by maximizing the effective minimum distance. With the new inner codes, we can decrease the decoding complexity of the inner code compared with conventional best convolutional code while maintaining the overall decoding performance.

关键词： CONCATENATED code COSET code convolutional code WEIGHT DISTRIBUTION

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Efficient Search for High-Rate Punctured convolutional codes Using Dual codes

Efficient Search for High-Rate Punctured Convolutional Codes...

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38th Symposium on Information Theory and its Applications (SITA)

作者： Moriya, Sen Kikuchi, Kana Sasano, Hiroshi Kindai Univ Sch Sci & Engn Higashiosaka Osaka 5778502 Japan

In this study, we consider techniques to search for highrate punctured convolutional code (PCC) encoders using dual code encoders. A low-rate R = 1/n convolutional code (CC) has a dual code that is identical to a PCC with rate R = (n - 1)/n. This implies that a rate R = 1/n convolutional code encoder can assist in searches for high-rate PCC encoders. On the other hand, we can derive a rate R = 1/n CC encoder from good PCC encoders with rate R = (n = 1)/n using dual code encoders. This paper proposes a method to obtain improved high-rate PCC encoders, using exhaustive search results of PCC encoders with rate R = 1/3 original encoders, and dual code encoders. We also show some PCC encoders obtained by searches that utilized our method.

关键词： convolutional code punctured code dual code weight spectrum

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code division multiple access based on independent codes and turbo decoding

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ANNALES DES TELECOMMUNICATIONS-ANNALS OF TELECOMMUNICATIONS 1999年第7-8期54卷 401-410页

作者： Brunel, L Boutros, J Ecole Natl Super Telecommun Commun & Elect Dept F-75634 Paris 13 France

We study a multiple access encoding/decoding algorithm based on iterative (turbo) decoding. The algorithm is suitable for both synchronous and asynchronous systems. The quasi-orthogonal pseudo-noise sequences of the DS-SSMA system are replaced by independent channel codes constructed by combining convolutional codes and random interleavers. The interference is rebuilt using soft output information. The results show that the iterative joint decoder is able to completely eliminate the co-channel interference. The performance of the multiple access system tends practically to that of a single user system.

关键词： code division multiple access direct sequence spectrum error correcting code decoding convolutional code interleaving iteration signal interference channel capacity numerical simulation system performance

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Channel Estimation and code Word Inference for Mobile Digital Satellite Broadcasting Reception

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IEICE TRANSACTIONS ON COMMUNICATIONS 2008年第12期E91B卷 3886-3898页

作者： Hamada, Masatoshi Ikeda, Shiro NHK Japan Broadcasting Corp Tokyo 1410031 Japan Inst Stat Math Tokyo 1068569 Japan

This paper proposes a method of improving reception of digital satellite broadcasting in a moving vehicle. According to some studies, the antennas used for mobile reception will be smaller in the next generation and reception will be more difficult because of a fading multipath channel with delays in a low carrier-to-noise ratio. Commonly used approaches to reduce the inter symbol interference caused by a fading multipath channel with delays are pilot sequences and diversity reception. Digital satellite broadcasting, however. does not transmit pilot sequences for channel estimation and it is not possible to install multiple antennas in a vehicle. This paper does not propose any change to the broadcasting standards but discusses how to process currently available digital satellite signals to obtain better results. Our method does not rely on the pilot sequences or diversity reception, but consists of channel estimation and stochastic inference methods. For each task, two methods are proposed. The maximum likelihood estimation and higher order statistics matching methods are proposed for the estimation, and the marginal with the joint probability inference methods are proposed for the stochastic inference. The improvements were confirmed through experiments with numerical simulations and real data. The computational costs are also discussed for future implementation.

关键词： digital satellite broadcasting mobile reception fading multipath channel stochastic inference convolutional code

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Performance of turbo code in WB-CDMA radio links with estimated channel variance

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IEICE TRANSACTIONS ON COMMUNICATIONS 1998年第12期E81B卷 2514-2518页

作者： Lee, HW Park, CS Yun, YS Hwang, SK SAMSUNG ELECT CO LTD IMT Syst Dev Grp 2000 Telecommun R&D Ctr Bundang Gu Kyungki Do 463050 South Korea Korea Adv Inst Sci & Technol Dept Elect Engn Commun Network Lab Yoosung Gu Taejon 305701 South Korea

In this paper, we consider the applicability of turbo code for future third generation (3G) mobile telecommunication systems. Futhermore, we propose a simple method of estimating the channel variance which is necessary for the MAP (Maximum A Posteriori) decoding algorithm. We compare the performance of turbo code with a known channel variance, conventional variance estimate and variance estimated by our proposed technique. We show that our variance estimation scheme is adequate for 3G WB-CDMA mobile systems without degradation of turbo code performance.

关键词： turbo code convolutional code Reed-Solomon code MAP algorithm WB-CDMA

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A METHOD FOR DECODING A VARIABLE-RATE ERROR-CORRECTING code BASED ON FINITE-STATE AUTOMATA

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CYBERNETICS AND SYSTEMS ANALYSIS 2015年第3期51卷 336-343页

作者： Zavadskyi, I. O. Taras Shevchenko Natl Univ Kyiv Kiev Ukraine

A decoding algorithm for a special error-correcting code is considered and its efficiency is estimated. This code is obtained as a result of processing information messages by finite automata and using a two-base numeral system. A general encoding algorithm is also considered. Both encoding or decoding are performed by a two-level system in which an input message is represented as a lower (2,3) code at the internal level, and the error correcting capabilities of this code are strengthened owing to its transformation with the help of a special finite automaton at the external level. In decoding, errors are first detected and corrected at the external level, and then possible remaining errors are eliminated by an internal automaton. The relationship between the external level of the system being considered and convolutional codes is investigated and the advantages of the proposed method are shown.

关键词： finite-state automaton error-correcting code (2,3) code convolutional code

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The FPGA Test Algorithm Of Large Constraint Length Convolution code Encoder 3

The FPGA Test Algorithm Of Large Constraint Length Convoluti...

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3rd IEEE Advanced Information Technology, Electronic and Automation Control Conference (IAEAC)

作者： Zhang Taotao Wang Manxi Rong Hui Liu Wanhong Liu Yufeng State Key Lab Complex Electromagnet Environm Effe Luoyang Peoples R China China Luoyang Elect Equipment Test Ctr Luoyang Peoples R China 32183 Troops Luoyang Peoples R China

ISBN: (纸本)9781538645093

Methods for checking the generator polynomial of a convolutional code are mathematical derivation and using mathematical tools Matlab verification. However, the existing inspection methods do not apply to large constraint length convolutional codes, using the method of parallel computing to make appropriate improvements to existing evil code checking algorithms, transform the parallel inspection algorithm into an algorithm suitable for FPGA hardware development platform. It can be used to improve the inspection efficiency of bad code.

关键词： convolutional code stack structure Parallel Computing

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Design of woven coded CPFSK via hierarchical code structure

Design of woven coded CPFSK via hierarchical code structure

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IEEE International Symposium on Information Theory

作者： Kempf, S Shavgulidze, S Bossert, M Univ Ulm Dept TAIT D-89081 Ulm Germany

ISBN: (纸本)0780382803

This paper describes the hierarchical woven coded CPFSK (hWCCPFSK), is a serial concatenation of different outer convolutional codes and inner continuous phase frequency shift keying (CPFSK). Classical woven coded CPFSK (cWCCPFSK) has identical outer convolutional codes. We show that with a proper choice of the outer codes, hWCCPFSK has better decoding behaviour but cWCCPFSK has larger free distance. Hence, hWCCPFSK performes better in the waterfall region of the bit error rate curves, while cWCCPFSK is better in the error floor region.

关键词： frequency shift keying continuous phase modulation concatenated codes convolutional codes decoding error statistics phase shift keying hierarchical woven coded CPFSK hWCCPFSK continuous phase frequency shift keying serial concatenation code classical woven coded CPFSK cWCCPFSK convolutional code free distance waterfall region bit error rate curve error floor

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Construction of High-Rate convolutional codes Using Dual codes*

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2023年第3期E106A卷 375-381页

作者： Moriya, Sen Sasano, Hiroshi Kindai Univ Fac Sci & Engn Higashiosaka 5778502 Japan Kindai Univ Cyber Informat Res Inst Higashiosaka 5778502 Japan

In this study, we consider techniques for searching high -rate convolutional code (CC) encoders using dual code encoders. A low-rate (R = 1/n) CC is a dual code to a high-rate (R = (n - 1)/n) CC. According to our past studies, if a CC encoder has a high performance, a dual code encoder to the CC also tends to have a good performance. However, it is not guaranteed to have the highest performance. We consider a method to obtain a high-rate CC encoder with a high performance using good dual code encoders, namely, high-performance low-rate CC encoders. We also present some CC encoders obtained by searches using our method.

关键词： convolutional code dual code weight spectrum

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