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11th Annual Conference of the International-Speech-Communication-Association 2010

作者： Fujimura, Hiroshi Masuko, Takashi Tachimori, Mitsuyoshi Toshiba Co Ltd Corp Res & Dev Ctr Saiwai Ku Kawasaki Kanagawa 2128582 Japan

ISBN: (纸本)9781617821233

This paper describes a novel technique to exploit duration information for low resource speech recognition systems. Using explicit duration models significantly increases computational cost due to a large search space. To avoid this problem, most of techniques using duration information adopt two-pass and N-best re-scoring approaches. Meanwhile, we propose an algorithm using word duration models with incremental speech rate normalization for the one-pass decoding approach. In the proposed technique, penalties are only added to scores of words with outlier durations, and not all words need to have duration models. Experimental results show that the proposed technique reduces up to 17% of errors on in-car digit string tasks without significant increase in computational cost.

关键词： speech recognition duration model normalized duration decoding algorithm

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NEURAL decoding USING A NONLINEAR GENERATIVE MODEL FOR BRAIN-COMPUTER INTERFACE

NEURAL DECODING USING A NONLINEAR GENERATIVE MODEL FOR BRAIN...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Henrique Dantas Spencer Kellis V John Mathews Bradley Greger Universidade Federal de Pernambuco Recife-PE - Brazil Biology and Biological Engineering Division California Institute of Technology Pasadena CA 91125 Department of Electrical & Computer Engineering University of Utah Salt Lake City UT 84109 School of Biological & Health Systems Engineering Arizona State University Tempe AZ 85287

ISBN: (纸本)9781479928941

Kalman filters have been used to decode neural signals and estimate hand kinematics in many studies. However, most prior work assumes a linear system model, an assumption that is almost certainly violated by neural systems. In this paper, we show that adding nonlinearities to the decoding algorithm improves the accuracy of tracking hand movements using neural signal acquired via a 32-channel micro-electrocorticographic (μECoG) grid placed over the arm and hand representations in the motor cortex. Experimental comparisons indicate that a Kalman filter with a fifth order polynomial generative model relating the hand kinematics signals to the neural signals improved the mean-square tracking performance in the hand movements over a conventional Kalman filter employing a linear system model. This finding is in accord with the current neurophysiological understanding of the decoded signals.

关键词： Kalman filters hand movement decoding Hand signals decoding algorithm Systems modelling Linear system Primary Motor Cortex Arm spiral arm kinematics

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EXPECTED COMPLEXITY OF SPHERE decoding FOR SPARSE INTEGER LEAST-SQUARE PROBLEMS

EXPECTED COMPLEXITY OF SPHERE DECODING FOR SPARSE INTEGER LE...

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IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Somsubhra Barik Haris Vikalo Department of Electrical and Computer Engineering University of Texas at Austin

ISBN: (纸本)9781479903573

Sparse integer least-squares problems come up in a wide range of applications including wireless communications and genomics. The sphere decoding algorithm can find near-optimal solution to these problems with reduced average complexity if the knowledge of sparsity of the unknown vector is used in decoding. In this paper, we formulate a sphere decoding approach that relies on the l_0-norm constraint on the unknown vector to solve sparse integer least-squares problems. The expected complexity of this algorithm is derived analytically for sparse alphabets associated with common applications such as sparse channel estimation and validated via simulations. The results indicate superior performance and speed compared to the classical sphere decoding algorithm.

关键词： decoding Spheres decoding algorithm channel estimation algorithms CARRIER SYSTEM Complexity Integer

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XJ-BP: Express Journey Belief Propagation decoding for Polar Codes

XJ-BP: Express Journey Belief Propagation Decoding for Polar...

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IEEE Global Communications Conference

作者： Jingwei Xu Tiben Che Gwan Choi Department of Electrical and Computer Engineering Texas A&M University

ISBN: (纸本)9781479959532

This paper presents a novel belief propagation (BP) based decoding algorithm for polar codes. The proposed algorithm facilitates belief propagation by utilizing the specific constituent codes that exist in the factor graph, which results in an express journey (XJ) for belief information to propagate in each decoding iteration. In addition, this XJ-BP decoder employs a novel round-trip message passing scheduling method for the increased efficiency. The proposed method simplifies min-sum (MS) BP decoder by 40.6%. Along with the round-trip scheduling, the XJ-BP algorithm reduces the computational complexity of MS BP decoding by 90.4%;this enables an energy-efficient hardware implementation of BP decoding in practice.

关键词： Polar code Belief propagation Factor Graph decoding decoding algorithm complexity classes decoders

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Mit :: Lcs :: Tr :: Mit-Lcs-Tr-662

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2016年

Mit :: Lcs :: Tr :: Mit-Lcs-Tr-662 by published by

关键词： algorithm code codes coloring problem constant number decoding algorithm expander expander codes expander graphs explicit constructions graph holographic holographic proof holographic proofs minimum distance mit-lcs-tr-662 polynomial proof proof checker proofs theorem

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Mit :: Lcs :: Tr :: Mit-Lcs-Tr-212

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2016年

Mit :: Lcs :: Tr :: Mit-Lcs-Tr-212 by published by

关键词： algorithm computation congruence decoding algorithm digitalized digitalized signatures expected number factorization function inversion mit-lcs-tr-212 mod public key quadratic signatures small percentage

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Mit :: Lcs :: Tr :: Mit-Lcs-Tr-731

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2016年

Mit :: Lcs :: Tr :: Mit-Lcs-Tr-731 by published by

关键词： algorithm bounded distance code codes decoding decoding algorithm decoding problem distance distance decoding hamming hamming code linear matrix mit-lcs-tr-731 polynomial polynomial time received word reed solomon solomon solomon code solomon codes

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Implementation of coding and encryption in satellite channel

Implementation of coding and encryption in satellite channel

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1996 International Conference on Communication Technology

作者： Xie, YX Chen, J Fu, CG COMMUN ENGN INST DEPT RADIO COMMUNNANJING 210016PEOPLES R CHINA

ISBN: (纸本)7505336355

An implementation of coding and encryption for data in a low Earth orbit satellite channel is presented. A system of block coding and block cipher is designed to improve the noise performance and for data security, respectively. The Reed-Muller code is adopted as the coding scheme and an improved algorithm based on the Reed algorithm is used as decoding algorithm. A supercipher system combined with a block cipher and a stream cipher is put forward to compensate the shortage of total encryption keys brought about by the short block length of the block cipher. For a system with a bit rate as high as 10/sup 6/ b/s, an EPROM array is used and one search process could implement both the coding and encryption.

关键词： satellite communication cryptography encoding decoding block codes Reed-Muller codes EPROM channel coding telecommunication channels noise performance data encryption data coding data security low Earth orbit satellite channel Reed-Muller code decoding algorithm Reed algorithm supercipher system block cipher stream cipher encryption keys block length bit rate EPROM array search proces

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Dec :: Tech Reports :: Src-Tn-1998-009

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2016年

Dec :: Tech Reports :: Src-Tn-1998-009 by published by

关键词： algorithm belief propagation block lengths code codes codes based decoding algorithm erasure codes graphs irregular irregular codes irregular graphs message message nodes nodes performance regular regular codes reports src-tn-1998-009 turbo turbo codes

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Review on 5G NR LDPC Code: Recommendations for DTTB System

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IEEE ACCESS 2021年 9卷 155413-155424页

作者： Li, Fengshuang Zhang, Chao Peng, Kewu Krylov, Aleksei E. Katyushnyj, Aleksandr A. Rashich, Andrey, V Tkachenko, Dmitry A. Makarov, Sergey B. Song, Jian Tsinghua Univ Dept Elect Engn Tsinghua Natl Lab Informat Sci & Technol Beijing 100084 Peoples R China Peng Cheng Lab Shenzhen 518055 Peoples R China Peter Great St Petersburg Polytech Univ Higher Sch Appl Phys & Space Technol St Petersburg 195251 Russia

The freeze of the 5th generation new radio (5G NR) Release 16 indicates that 5G development has stepped into a new stage. The application of a dedicated low-density parity-check (LDPC) code for channel coding is an important technical advance that distinguishes 5G NR from the 4th generation (4G) long-term evolution (LTE) and LIE-advanced. Although LDPC codes have been used in many different systems, the newly developed LDPC code in 5G NR integrates many cutting-edge technologies to provide better performance and attractive features. Thus, it can be a good reference for channel coding in other evolving systems headed by digital terrestrial television broadcasting (DTTB). In emerging applications, the DTTB system needs to carry information with higher density, while meeting the high requirements for real-time, coverage, and bit error rate of broadcasting. To provide a reference for DTTB channel coding that improves its performance and supports new services, a review of 5G NR LDPC code implementation is carried out from three aspects: code analysis and design, decoding algorithm, and decoder architecture. We thoroughly evaluate each solution and highlight some candidates for existing implementations or directions for further development of the DTTB system.

关键词： Low-density parity-check (LDPC) code digital terrestrial television broadcasting (DTTB) 5th generation new radio (5G NR) code design decoding algorithm decoder architecture

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