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World Congress on Software Engineering

作者： Wang, Jun Yang, Shu-Hui Beijing Informat Technol Univ Coll Photoelect Informat & Commun Engn Beijing Peoples R China

ISBN: (纸本)9780769535708

In this paper, we present a simplification of log-BP algorithm which is able to reduce iterative times of decoding algorithm and save the hardware resource of decoder for LDPC codes. This simplification designs an improved layered-iterative decoding method without reducing the decoding performance, of which speed the updating of check nodes and variable nodes. Simulation results show that the improved layered-iterative log-BP algorithm with six-time iteration exhibits similar decoding performance to the traditional log-BP algorithm with ten-time iteration. When the improved log-BP and traditional log-BP both are simulated in ten-time iteration, the SNR of improved layer-iterative method decreases about 0.25 dB than that of traditional log-BP in the BER of 1e-2.

关键词： LDPC Codes Belief Propagation decoding algorithm Layered-iterative decoding Performance

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An Improved decoding algorithm Based on Min-max for NB-LDPC Codes 36

An Improved Decoding Algorithm Based on Min-max for NB-LDPC ...

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第36届中国控制会议

作者： Mengzhu Chen Jin Xu Jun Xu Danfeng Zhao Jiahui Meng Wireless Technology preresearch Team ZTE Corporation College of Information and Communication Engineering Harbin Engineering University

ISBN: (纸本)9781538629185

When the code length is moderate,non-binary low-density parity-check（NB-LDPC） codes can achieve better error correcting performance than their binary counterparts at the expense of higher decoding *** check node processing is a major bottleneck of NB-LDPC *** this paper,Min-max decoding algorithm is proposed based on a new forward backward processing method of check nodes,select only a part of the most reliable information to the forward-backward calculation process,and change the variable nodes to check nodes（v-to-c） generation of *** this algorithm,a kind of code（768,1152） defined on GF（4） is simulated and compared with belief propagation in log domain（LOG-BP） decoding *** results show Min-max decoding algorithm reduce information storage requirements and the computational complexity,conducive to engineering implementation.

关键词： non-binary low density parity check codes Min-max decoding algorithm check nodes

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A Configurable Approximation Min-Sum decoding algorithm for Low Density Parity Check Codes 2019

A Configurable Approximation Min-Sum Decoding Algorithm for ...

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9th International Conference on Information Communication and Management (ICICM)

作者： Wu, Ruizhen Wang, Lin Wang, Mingming Intel Mobile Commun Technol Xian Ltd Xian Peoples R China

ISBN: (纸本)9781450371889

A configurable approximation Min-sum decoding algorithm for LDPC is proposed in this paper. The degradation factor of BP to MS is found and optimized based on Jacobian Logarithm and hardware working mode. The decoding algorithm is configurable to satisfy different environment's need and will only need update the variable memory. The simulation is based on LDPC NR 3GPP 38.212 release and the comparison results showed the proposed configurable approximation Min-sum decoding algorithm have a better BER performance. The hardware of this proposed algorithm is based on Min-sum decoder and the extra cost is only a shifter and an adder besides the configurable memory.

关键词： LDPC Min-Sum decoding algorithm Approximation

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Improved BP decoding algorithm for LDPC Codes

Improved BP Decoding Algorithm for LDPC Codes

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International Conference on Mechatronics and Semiconductor Materials (ICMSCM 2013)

作者： Wang, Lina Liu, Xiao Univ Sci & Technol Beijing Dept Commun Engn Sch Comp & Commun Engn Beijing 100083 Peoples R China

ISBN: (纸本)9783037859391

In this paper, an improved belief propagation decoding algorithm was proposed for low density parity check codes. In the proposed decoding process, error bits can be detected once again after hard-decision in the conventional BP decoding algorithm. The detection criterion is based on check matrix characteristics and D-value between prior probability and posterior probability. Simulation results demonstrate the performance of the improved BP decoding algorithm outperform that of the conventional BP decoding algorithm.

关键词： low density parity check codes belief propagation decoding algorithm

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Response Probability Based decoding algorithm for Large Vocabulary Continuous Speech Recognition

Response Probability Based Decoding Algorithm for Large Voca...

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12th Annual Conference of the International-Speech-Communication-Association 2011 (INTERSPEECH 2011)

作者： Yang, Zhanlei Chao, Hao Liu, Wenju Chinese Acad Sci Inst Automat NLPR Beijing 100190 Peoples R China

ISBN: (纸本)9781618392701

Acoustic space is made up of phonemes, and it can be modeled using universal background model (UBM). Therefore, there are some relations between the phonemes and Gaussian mixture components of the UBM. This paper represents these relations by proposing a response probability (RP) model, which describes the location information of speech observations within the whole acoustic space. At decoding stage, proposed RP model is fused with traditional acoustic model (AM) and language model (LM). After integrating RP, the decoder is guided to weaken or enhance different path candidates respectively and directed to extend the most promising paths. Experiments conducted on Mandarin broadcasting speech show that character error rate is relatively reduced by 9.15% when RP model is used and by 11.89% when an improved RP model is used.

关键词： speech recognition decoding algorithm pruning response probability

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On the Fly Belief Propagation decoding algorithm for LT Codes 6th

On the Fly Belief Propagation Decoding Algorithm for LT Code...

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6th International Conference on Communications, Signal Processing, and Systems (ICCSPS)

作者： Suo, Longlong Zhang, Gengxin Bian, Dongmin Lv, Jing Chen, Haiping Liu, Zijun PLA Univ Sci & Technol Nanjing Jiangsu Peoples R China Nanjing Univ Posts & Telecommun Nanjing Jiangsu Peoples R China Chongqing Commun Inst Chongqing Peoples R China First Engineers Sci Res Inst Wuxi Peoples R China

ISBN: (纸本)9789811065712;9789811065705

As the first realisation of Fountain Codes, Luby Transform (LT) codes provide high reliability and scalability and low complexities for data transmission in networks. Two basic algorithms, Belief Propagation (BP) and Gaussian Elimination (GE), were introduced to decode LT codes. However, both of them execute their decoding process only after all the encoded symbols have been received by decoder, which results in the waste of time, storage space and computing resource. In this paper, an improved decoding algorithm termed on the fly belief propagation (OFBP) for LT codes is proposed. Based on the BP algorithm, OFBP performs the decoding processing once each encoded symbol arrives thus distributing the decoding work during all symbols reception. Compared with the traditional BP algorithm, the actual decoding time of the proposed algorithm is highly shortened. Moreover, without processing all the encoded symbols, the actual storage space and decoding complexity are greatly reduced while maintaining the same performance relative to the traditional BP decoding scheme.

关键词： Fountain codes LT codes Belief Propagation On the fly decoding algorithm

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Nonbinary LDPC-Coded Differential Modulation: Performance and decoding algorithm

Nonbinary LDPC-Coded Differential Modulation: Performance an...

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IEEE Information Theory Workshop (ITW)

作者： Li, Minghua Bai, Baoming Zhang, Peiying Ma, Xiao Xidian Univ State Key Lab ISN Xian 710071 Peoples R China Sun Yat Sen Univ Dept ECE Guangzhou 510275 Peoples R China

ISBN: (纸本)9781479913213

This paper is concerned with the design and performance of non-binary LDPC-coded differential modulation systems. A low-complexity joint detection/decoding method for non-coherent demodulation is proposed, in which the hard-message-passing strategy is used for a joint factor graph. It combines trellis-based differential detection aided with channel prediction and the reliability-based decoding of nonbinary LDPC codes introduced in [1]. The Max-Log-MAP algorithm with soft-in hard-out is used for the differential detection. Simulation results show that the proposed method can offer good performances with a greatly reduced complexity.

关键词： decoding algorithm low density parity check codes differential modulation noncoherent demodulation differential detection joint factor Factor Graph FLEXIBLE

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A decoding algorithm AND SOME PROPERTIES OF BOINCK AND TILBORG T-EC/AUED CODE

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 1993年第9期E76A卷 1535-1536页

作者： YOSHIDA, K JINUSHI, H SAKANIWA, K NTT Data Communications Systems Corp Tokyo Japan

We propose a decoding algorithm for the t-EC/AUED code proposed by Boinck and Tilborg. The proposed algorithm also reveals some remarkable properties of the code.

关键词： T-EC/AUED CODES SYMMETRICAL ERROR UNIDIRECTIONAL ERROR BURST-ERROR decoding algorithm

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AN IMPROVED STEADY SEGMENT BASED decoding algorithm BY USING RESPONSE PROBABILITY FOR LVCSR

AN IMPROVED STEADY SEGMENT BASED DECODING ALGORITHM BY USING...

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8th International Symposium on Chinese Spoken Language Processing (ISCSLP)

作者： Yang, Zhanlei Liu, Wenju Chao, Hao Chinese Acad Sci Inst Automat NLPR Beijing 100190 Peoples R China

ISBN: (纸本)9781467325073;9781467325066

This paper proposes a novel decoding algorithm by integrating both steady speech segments and observations' location information into conventional path extension framework. First, speech segments which possess stable spectrum are extracted. Second, a preliminarily improved algorithm is given by modifying traditional inter-HMM extension framework using the detected steady segments. Then, at probability calculation stage, response probability (RP), which represents location information of observations within acoustic feature space, is further incorporated into decoding. Thus, RP directs the decoder to enhance/weaken path candidates that get through the front end steady-segment-based decoding. Experiments conducted on Mandarin speech recognition show that character error rate of proposed algorithm achieves a 4.6% relative reduction when compared with a system in which only steady segment is used, and run time factor achieves a 10.0% relative reduction when compared with a system in which only RP is used.

关键词： decoding algorithm path extension steady segment response probability probability fusion

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A Novel Hardware-Oriented decoding algorithm for Non-binary LDPC Codes

A Novel Hardware-Oriented Decoding Algorithm for Non-binary ...

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IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)

作者： Yang, Hong Yang, Qing-qing Fang, Yuanwei Zhou, Xiaofang Sobelman, Gerald E. Fudan Univ State Key Lab ASIC & Syst Shanghai 200433 Peoples R China Univ Minnesota Dept Elect & Comp Engn Minneapolis MN USA

ISBN: (纸本)9781457717284;9781457717291

This paper presents a novel hardware-oriented decoding algorithm in the log-domain for non-binary LDPC codes over GF(2(m)). As for max-log-SPA, only summations and comparisons are required in this new algorithm. During the vertical update, these two operations are divided into layers based on the distribution of variable vectors that satisfy the check function. The number of additions during the vertical update is reduced by a factor of approximately p-2 without a performance loss, where p is the row weight of the parity check matrix.

关键词： check matrix decoding algorithm low density parity check codes vertical

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