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Channel-Aware Gradient Descent bit-flipping algorithm for LDPC Codes

IEEE COMMUNICATIONS LETTERS 2025年第4期29卷 809-813页

作者： Min, Woohong Yang, Kyeongcheol Pohang Univ Sci & Technol POSTECH Dept Elect Engn Pohang Si 37673 Gyeongsangbuk D South Korea

The gradient descent bit-flipping with momentum (GDBF-w/M) and probabilistic GDBF-w/M (PGDBF-w/M) algorithms significantly improve the decoding performance of the bit-flipping (BF) algorithm. In this letter, we propose a channel-aware GDBF-w/M algorithm which operates deterministically based on the received values from the additive white Gaussian noise (AWGN) channel. Numerical results show that the proposed algorithm does not only mitigate the error-floor phenomenon of the GDBF-w/M algorithm, but it also has better decoding performance than the PGDBF-w/M algorithm without the need for a random number generator. Furthermore, the complexity of the proposed algorithm is slightly higher than that of the GDBF-w/M algorithm.

关键词： Decoding Probabilistic logic Iterative decoding Vectors AWGN channels Indexes Training Reliability Optimization Maximum likelihood decoding LDPC codes bit-flipping algorithm decoding algorithms

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On Error Correction Capability of bit-flipping algorithm for LDPC Codes

On Error Correction Capability of Bit-Flipping Algorithm for...

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IEEE International Symposium on Information Theory (ISIT)

作者： Chen, Wen-Yao Lu, Chung-Chin Natl Tsing Hua Univ Dept Elect Engn Hsinchu 30013 Taiwan

ISBN: (纸本)9781457705953

The error correction capability of bit-flipping decoding algorithm for low density parity-check (LDPC) codes is studied by introducing variable node adjacency (VNA) graphs which are derived from Tanner graphs of LDPC codes. For codes with column weight lambda and girth g - 8, it can be shown that error patterns of weight less than or equal to lambda - 1 can be corrected. This result implies that the bit-flipping algorithm could decode up to the random error-correcting capability over binary symmetric channel for girth 8 codes whose random error-correcting capability is equal to lambda - perpendicular to.

关键词： Low density parity-check codes bit-flipping algorithm Tanner graphs variable node adjacency graphs

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Analysis of bit-flipping algorithm of Irregular Low-Density Parity-Check Codes 11

Analysis of Bit-Flipping Algorithm of Irregular Low-Density ...

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11th International Conference on Information and Communication Technology Convergence (ICTC) - Data, Network, and AI in the age of Untact (ICTC)

作者： Kim, Myungin Ha, Jeongseok Korea Adv Inst Sci & Technol Sch Elect Engn Daejeon South Korea

ISBN: (纸本)9781728167589

In this work, we analytically derive the evolution of single-bit messages in the bit-flipping algorithm (BFA) for irregular low-density parity-check (LDPC) codes on the binary symmetric channel (BSC). In particular, the analysis tracks the probability distributions of the flipping functions and the bit-decision error at each iteration, which is possible by introducing a state variable at each variable node. The probability distributions are indirectly obtained by taking advantage of the state and state transition probabilities. The analysis will be confirmed by comparing analytic evaluations with simulation results. For the comparison, we implement LDPC codes at a finite length.

关键词： LDPC codes bit-flipping algorithm irregular degree distribution state probability state transition probability

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Density Evolution of the bit-flipping Decoding algorithm of Regular Low-Density Parity-Check Codes 10

Density Evolution of the Bit-Flipping Decoding Algorithm of ...

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10th International Conference on Information and Communication Technology Convergence (ICTC) - ICT Convergence Leading the Autonomous Future

作者： Kim, Myungin Ha, Jeongseok Korea Adv Inst Sci & Technol Sch Elect Engn Daejeon South Korea

ISBN: (纸本)9781728108933

In this paper, we develop the density evolution of bit-flipping algorithm (BFA) for regular low-density parity-check (LDPC) codes and analyze the evolution of probability density for the bit-decision error. In contrast to the sum-product algorithm (SPA) and min-sum algorithm (MSA), the density evolution for BFA has remained untouched, which motivates this work. In the developed density evolution for BFA, we first introduce a state variable which is a function of bit-decision result and the flipping function value at each iteration. Then, the state probability is derived, with which the density of bit-decision error is obtained. To confirm the derivations, we design regular LDPC codes and compare the empirical evaluations of bit-error rates and the derived probability of bit-decision errors.

关键词： LDPC code bit-flipping algorithm flipping function density evolution

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Frequency memory based gradient descent bit flipping algorithm

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IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 2015年第5期10卷 585-591页

作者： Asatani, Jun Kawanishi, Hiroaki Tokushige, Hitoshi Katayama, Kengo Okayama Univ Sci Dept Informat & Comp Engn Fac Engn Kita Ku Okayama 7000005 Japan Kumamoto Gakuen Univ Fac Commerce Dept Commerce Chuo Ku Kumamoto 8628680 Japan

An escape method for the local optima of the gradient descent bit-flipping (GDBF) algorithm for decoding low-density parity-check codes is proposed. In the GDBF algorithm, a search point is likely to be trapped in a local optimum, which causes performance degradation of the algorithm. To address this issue, we introduce a list to store the frequency of visits to each local optimum and devise a strategy to increase the distance of a search point from a local optimum with respect to the frequency. (c) 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

关键词： bit-flipping algorithm LDPC codes combinatorial optimization problem local optima

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Low-Comprexity Sliding Window Block decoding Using bit-flipping for OVFDM Systems

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IEEE ACCESS 2017年 5卷 25171-25180页

作者： Zhang, Hongtao Chen, Ying Li, Daoben Wang, Yafeng Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing 100876 Peoples R China

Overlapped frequency division multiplexing (OVFDM) systems can obtain high spectral effciency (SE), which is proportional to the constraint length. However, high decoding complexity imposes the main challenge on OVFDM systems. This paper proposes a low-complexity sliding window ( SW) block decoding algorithm for OVFDM systems, where data symbols are estimated based on the reception of a SW instead of a date frame. Specifically, block code of each SW is decoded by bit-flipping algorithm where the bits to be flipped are selected according to the largest absolute value criterion. Using this criterion, the complexity to obtain the near optimal bit-flipping vector grows only linearly with the SW length. In addition, the study of the decoding algorithm is based on the design of OVFDM encoding structure, where symbols can occupy orthogonal in-phase and quadrature channels simultaneously to further improve SE by a factor of two. Simulation results show that OVFDM SW decoding with bit-flipping algorithm can be used when constraint length is relatively high (constraint length >= 20) because the complexity goes roughly linearly with the increase of constraint length.

关键词： OVFDM sliding window decoding bit-flipping algorithm block code spectral efficiency

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Fault-Tolerant Probabilistic Gradient-Descent bit flipping Decoder

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IEEE COMMUNICATIONS LETTERS 2014年第9期18卷 1487-1490页

作者： Al Rasheed, Omran Ivanis, Predrag Vasic, Bane Univ Belgrade Fac Elect Engn Belgrade 11120 Serbia Univ Arizona Dept Elect & Comp Engn Tucson AZ 85721 USA

We propose a gradient descent type bit flipping algorithm for decoding low density parity check codes on the binary symmetric channel. Randomness introduced in the bit flipping rule makes this class of decoders not only superior to other decoding algorithms of this type, but also robust to logic-gate failures. We report a surprising discovery that for a broad range of gate failure probability our decoders actually benefit from faults in logic gates which serve as an inherent source of randomness and help the decoding algorithm to escape from local minima associated with trapping sets.

关键词： bit-flipping algorithm low-density parity check codes decoding by unreliable hardware fault-tolerance

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Gradient Descent bit flipping algorithms for Decoding LDPC Codes

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IEEE TRANSACTIONS ON COMMUNICATIONS 2010年第6期58卷 1610-1614页

作者： Wadayama, Tadashi Nakamura, Keisuke Yagita, Masayuki Funahashi, Yuuki Usami, Shogo Takumi, Ichi Nagoya Inst Technol Nagoya Aichi 4668555 Japan Meijo Univ Nagoya Aichi Japan

A novel class of bit-flipping (BF) algorithm for decoding low-density parity-check (LDPC) codes is presented. The proposed algorithms, which are referred to as gradient descent bit flipping (GDBF) algorithms, can be regarded as simplified gradient descent algorithms. The proposed algorithms exhibit better decoding performance than known BF algorithms, such as the weighted BF algorithm or the modified weighted BF algorithm for several LDPC codes.

关键词： LDPC code bit-flipping algorithm gradient descent algorithm

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A Modified Gradient Descent bit flipping Decoding Scheme for LDPC Codes

A Modified Gradient Descent Bit Flipping Decoding Scheme for...

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IEEE International Workshop on Signal Processing Systems (SiPS)

作者： Li, Mao-Ruei Jhuang, Li-Min Ueng, Yeong-Luh Natl Tsing Hua Univ Dept Elect Engn Hsinchu Taiwan

ISBN: (纸本)9781538604465

It is known that the Gradient descent bit flipping (GDBF) algorithm is an effective hard-decision decoding algorithm for low-density parity-check (LDPC) codes. However, trapping in a local maximum limits its error-rate performance. This paper presents a modified GDBF scheme that can mitigate the trapping problem and hence can improve the error-rate performance. Compared to the conventional GDBF algorithm, the proposed method is able to improve the decoding performance of 0.3dB for an (18582, 16626) code. The (18582, 16626) LDPC decoder integrates 636k logic gates and achieves a throughput of 12.4 Gbps at a clock frequency of 200 MHz in a 90nm process.

关键词： LDPC codes hard-decision decoding bit-flipping algorithm gradient descent bit-flipping (GDBF) algorithm

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Variable LDPC coding rate performances for multicarrier systems using HD decoding

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IEE PROCEEDINGS-COMMUNICATIONS 2006年第1期153卷 69-73页

作者： Cances, JP Meghdadi, V Univ Limoges ENSIL F-87068 Limoges France

An adaptive coding scheme minimising the BER of a bit-interleaved coded modulation OFDM system performing hard-decisions (HD) after the demodulation and ideal interleaving is proposed. The subcarrier code rate levels subject to a rate constraint are varied according to perfect channel state information at the transmitter. The derived adaptive scheme uses low-density parity-check codes. A modified bit-flipping algorithm provides HD decoding and can be applied either alone or combined with a power loading scheme. It is shown by Monte Carlo simulations that, for broadband systems with Rayleigh fading, the loading procedure provides a signal-to-noise ratio gain up to 3dB for in average BER level of 10(-5).

关键词： adaptive coding scheme bit-interleaved coded modulation Game theory channel coding variable rate codes bit error rate BICM parity check codes Monte Carlo simulation modulation coding multicarrier system OFDM modulation broadband system power loading scheme adaptive codes interleaved codes OFDM system low-density parity-check code Monte Carlo methods broadband networks Rayleigh channels decision theory hard-decision decoding error statistics perfect channel state information BER decoding demodulation bit-flipping algorithm Rayleigh fading LDPC transmitter Codes Radio links and equipment orthogonal frequency division multiplexing

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