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Blind reconstruction of convolutional code based on segmented Walsh-Hadamard transform

Journal of Systems Engineering and Electronics 2014年第5期25卷 748-754页

作者： Fenghua Wang Hui Xie Zhitao Huang College of Electronic Science and Engineering National University of Defense Technology Department of Electronic and Optics Engineering Ordance Engineering College

Walsh-Hadamard transform （WriT） can solve linear error equations on Field F2, and the method can be used to recover the parameters of convolutional code. However, solving the equations with many unknowns needs enormous computer memory which limits the application of WriT. In order to solve this problem, a method based on segmented WriT is proposed in this paper. The coefficient vector of high dimension is reshaped and two vectors of lower dimension are obtained. Then the WriT is operated and the requirement for computer memory is much reduced. The code rate and the constraint length of convolutional code are detected from the Walsh spectrum. And the check vector is recovered from the peak position. The validity of the method is verified by the simulation result, and the performance is proved to be optimal.

关键词： convolutional code blind reconstruction Walsh-Hadamard transform (WriT) tinear error equation.

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Adaptive soft' sliding block decoding of convolutional code using the artificial neural network

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TRANSACTIONS ON EMERGING TELECOMMUNICATIONS TECHNOLOGIES 2012年第7期23卷 672-677页

作者： Rajbhandari, Sujan Ghassemlooy, Zabih Angelova, Maia Northumbria Univ Sch Comp Engn & Informat Sci Intelligent Modelling Lab Opt Commun Res Grp Newcastle Upon Tyne NE1 8ST Tyne & Wear England

A Viterbi algorithm (VA) is the optimal decoding strategy for the convolutional code. The Viterbi algorithm is complex and requires a large memory and delay. In this paper, an alternative sub-optimal decoder based on the artificial neural network (ANN) is proposed and studied using a sliding block decoding algorithm. The ANN is trained in a supervised manner and the system parameters are optimised using computer simulations for the optimum performance. Comparative study with the Viterbi decoder is carried out. The performance of the ANN decoder is found to be comparable to the Viterbi soft decoding with much reduced decoding length. The key advantages of the proposed ANN decoder compared with other ANN decoders are the reduced decoding and training length, adaptive decoding, no iteration required and possibility of parallel decoding. Copyright (C) 2012 John Wiley & Sons, Ltd.

关键词： convolutional code artificial neural network block decoding

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Modification of extrinsic information for parallel concatenated Gallager/convolutional code to improve performance/complexity trade-offs

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AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 2018年 83卷 484-491页

作者： Oudjani, Brahim Tebbikh, Hicham Doghmane, Noureddine Badji Mokhtar Univ Dept Elect BP 12 Annaba 23000 Algeria Res Ctr Ind Technol CRTI POB 64 Algiers 16000 Algeria Univ 08 Mai 45 LAIG BP 401 Guelma 24000 Algeria Badji Mokhtar Univ LASA BP 12 Annaba 23000 Algeria

To benefit the properties of both Low-Density Parity-Check (LDPC) and Turbo convolutional codes (TCC), we propose a practical concatenated Gallager/convolutional code in a turbo coding way. The modified code creates a balance between the advantages and the disadvantages of LDPC and TCC in terms of the overall complexity and latency. This will be done through two different component SISO decoders;LDPC and convolutional code of the same rate 1/2 without interleaver. Since the two SISO decoders are different in nature, they exchange extrinsic information that will be easily adapted to each other. The study of computation complexity and decoding performance over an AWGN channel indicates that such approach leads to excellent performance because of several factors. The proposed approach achieves a trade-off between waterfall and error floor regions. It reduces complexity decoding compared to TCC and 3D-TCC. It provides a better coding gain over LDPC and PCGC (Parallel Concatenated Gallager codes). These features will ensure optimal outcomes and cost-performance ratio, and thus, this trend can be the best choice for today's communication systems.

关键词： Computation complexity convolutional code Extrinsic information LDPC Parallel concatenation Turbo code

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On the Analytical Solution of Rank Problem in the convolutional code Identification Context

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IEEE COMMUNICATIONS LETTERS 2016年第3期20卷 442-445页

作者： Soteh, Ahmad Gholizadeh Bizaki, Hossein Khaleghi Malek Ashtar Univ Technol Dept Elect Engn Tehran Iran

The rank-based method is very effective to identify the convolutional code parameters in a non-cooperative context. This method cuts the received sequence up into vectors of length l to form the rows of matrix C-(l). It is well known that there is a relationship between the code parameters and the rank behavior of C-(l). However, finding the general form of this relation is a challenging open problem. In this letter, we formulate and solve this problem for rate k/n convolutional codes. Our analytical solution show that the rank behavior is highly dependent on the dual code constraint lengths. Moreover, it is proved that the applied experimental rank relation in prior works is true only for rate n-1/n codes.

关键词： Blind identification convolutional code non-cooperative system dual code constraint lengths

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Iterative Threshold Channel Estimation in ORGV convolutional code MISO-OFDM System

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IETE TECHNICAL REVIEW 2022年第5期39卷 1065-1080页

作者： Zhou, Xiao Zhang, Mingtong Wang, Chengyou Shandong Univ Sch Mech Elect & Informat Engn Weihai Peoples R China

In the orthogonal frequency division multiplexing (OFDM) transmission system, when the digital symbols are transmitted in the wireless channel, it would be affected by a lot of noise interference due to the unsatisfactory condition characteristics of the wireless channel itself, therefore, the symbol error and bit error would be generated. To achieve a certain bit error rate (BER) under the condition of known signal-to-noise ratio (SNR), convolutional channel coding and block interleaver should be utilized to further reduce the BER. Moreover, convolutional code is almost utilized in all wireless communication systems. This paper proposes a convolutional code channel estimation method in multiple-input single-output (MISO)-based OFDM (MISO-OFDM) system with frequency-shift m-sequence (FSMS) as guard interval (GI) for avoiding inter-symbol interference (ISI). The proposed space-frequency block code (SFBC) MISO-OFDM system achieves higher transmit diversity gains and better BER performance. Simulation results verify that the proposed iterative threshold channel estimation (ITCE) method in octal representation generation vector (ORGV) convolutional code 4 x 1 MISO-OFDM system provides good BER and normalized mean squared error (NMSE) performance with significant coding gains in both static and dynamic multipath channels.

关键词： convolutional code Frequency-shift m-sequence (FSMS) Iterative threshold channel estimation (ITCE) Multiple-input single-output (MISO) Octal representation generation vector (ORGV) Orthogonal frequency division multiplexing (OFDM) Space-frequency block code (SFBC)

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Every convolutional code is a Goppa code

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IEEE TRANSACTIONS ON INFORMATION THEORY 2013年第10期59卷 6628-6641页

作者： Iglesias Curto, Jose Ignacio Castaneda, Angel Luis Munoz Munoz Porras, Jose Maria Serrano Sotelo, Gloria Univ Salamanca Dept Math E-37008 Salamanca Spain Univ Salamanca IUFFyM E-37008 Salamanca Spain Free Univ Berlin Inst Math D-14195 Berlin Germany

convolutional Goppa codes (CGC) were defined in Appl. Algebra Eng. Comm. Comput., vol. 15, pp. 51-61, 2004 and IEEE Trans. Inf. Theory, vol. 52, 340-344, 2006. In this paper, we prove that every convolutional code is a CGC defined over a smooth curve over F-q(z) and we give an explicit construction of convolutional codes as CGC over the projective line P-Fq(z)(1). We characterize which convolutional codes are defined by a complete linear system over curves of genus 0, 1, and over hyperelliptic curves. We apply these results to provide detailed constructions of some linear block codes as Goppa codes.

关键词： Algebraic curve complete linear system convolutional code Goppa code rational point

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The Golay convolutional code - Some application aspects

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IEEE TRANSACTIONS ON INFORMATION THEORY 1999年第6期45卷 2191-2199页

作者： Riedel, S Weiss, C Adam Opel AG D-65432 Russelsheim Germany Tech Univ Munich Inst Commun Engn D-80290 Munich Germany

The Golay convolutional code and related block codes are investigated from an application point of vies. We calculate the distance spectrum of the Golay convolutional code and the weight distributions of the block codes using the transfer-matrix method. The performance of the considered codes is shown and discussed. Moreover, the codes are applied as component codes of parallel concatenated codes which are iteratively decoded.

关键词： convolutional code Golay code iterative decoding parallel concatenation tail-biting

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NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2010年第2期29卷 123-131页

作者： Liu, Xiao Tian, Feng Chun Wang, Shi Yuan Chongqing Univ Coll Commun Engn Chongqing 400044 Peoples R China

Based on the convolutional code model of error-correction coding theory, we propose an approach to characterize and compare DNA sequences with consideration of the effect of codon context. We construct an 8-component vector whose components are the normalized leading eigenvalues of the L/L and M/M matrices associated with the original DNA sequences and the transformed sequences. The utility of our approach is illustrated by the examination of the similarities/dissimilarities among the coding sequences of the first exon of -globin gene of 11 species, and the efficiency of error-correction coding theory in analysis of similarity/dissimilarity of DNA sequences is represented.

关键词： Error-correction coding convolutional code similarities dissimilarities analysis

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The Use of convolutional code for Narrowband Interference Suppression in OFDM-DVBT System 1

The Use of Convolutional Code for Narrowband Interference Su...

引用

1st International Conference on Communication and Computer Engineering (ICOCOE)

作者： Abdullah, Aizura Jamal, Muhammad Sobrun Jamil Abdullah, Khaizuran Ismail, Ahmad Fadzil Asnawi, Ani Liza Int Islamic Univ IIUM Dept Elect & Comp Engn Kuala Lumpur Malaysia

ISBN: (纸本)9783319076744;9783319076737

The problem of mitigating narrowband interference (NBI) due to coexistence between Digital Video Broadcasting-Terrestrial (DVB-T) and International Mobile Telecommunication-Advanced (IMT-A) system is considered. It is assumed that a spectrum of IMT-A system between 790 and 862 MHz interfere the spectrum of the OFDM signal in DVB-T band. Two types of convolutional code (CC) which are non-systematic convolutional code (NSCC) and recursive systematic convolutional code (RSCC) are proposed to mitigate NBI. The performance of the two techniques is compared under additive white Gaussian noise (AWGN) channel. It is observed that NSCC has a better bit error rate (BER) performance than RSCC. The result showed good performance for low SNR (<= 5 dB).

关键词： OFDM convolutional code Narrowband interference DVB-T

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Performance of discrete wavelet transform with convolutional code in chaotic DS-CDMA system for microsatellite communication

Performance of discrete wavelet transform with convolutional...

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IEEE International Geoscience and Remote Sensing Symposium

作者： Karim, K Mosbah, K Malek, B Achour, B Electromagnet & Telecommun Lab Constantine Algeria

ISBN: (纸本)0780387422

In this paper, we develop a soft-ware package on C ++ Builder language that consists to made a combination between chaos based spread sequence for DS-CDMA combined with covolutional code and with the discrete wavelet transform in microsatellite communication. The proposed strategy is based on tow key ideas The first concept consist the use of the chaotic spread-spectrum using discrete-time synchronization in order to minimize interference (MAI) caused by the multiple access, to assure the transmitter-receiver synchronization and to secure the transmission information. The second idea consist the use of convolutional code with Viterbi algorithm and discrete wavelet transform to decreases SNR in order to increases system capacity. The attractable soft-ware obtained can be suitably inserted as a routine code in a large soft-ware package.

关键词： discrete wavlet transform convolutional code DS-CDMA.C plus plus Builder

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