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Two Bit-Serial Architectures for Check Node Update in Min-Sum Decoding of LDPC Codes 认领 引用
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作者 Hu Qing He Xuan +2 位作者 Luo Lisha Cai Kui Tang Xiaohu 《China Communications》 SCIE EI CSCD 2026年第3期142-150,共9页
Implementing check node(CN)update based on the minimum value(MV)and second MV of incoming message magnitudes is crucial for Min-Sum Algorithms(MSAs).In the category of bit-serial implementations,existing schemes suffe... Implementing check node(CN)update based on the minimum value(MV)and second MV of incoming message magnitudes is crucial for Min-Sum Algorithms(MSAs).In the category of bit-serial implementations,existing schemes suffer from decoding performance degradation,large hardware areas,and/or long latency.In this paper,we propose two efficient CN update functions based on the MV and an approximate second MV,and design bit-serial architectures to implement them.Simulation results show that our functions exhibit the minimum decoding performance degradation compared to the existing functions using approximate second MVs.Moreover,the applicationspecific integrated circuits(ASIC)implementation results demonstrate the advantages of our architectures in terms of area,latency,etc. 展开更多
关键词 bit-serial check node update hardware implementation LDPC code min-sum algorithm
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Study on the aided PC-ASCL decoding algorithm based on optimized parity check codes 认领 引用
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作者 Jianguo YUAN Deyi YANG +1 位作者 Ziliang ZHU Jinneng XIANG 《Optoelectronics Letters》 EI 2026年第2期87-91,共5页
Aiming at the poor performance of the parity check(PC) aided adaptive successive cancellation list(PC-ASCL) decoding algorithm because the PC code in the polar code can only verify odd errors, an optimized parity chec... Aiming at the poor performance of the parity check(PC) aided adaptive successive cancellation list(PC-ASCL) decoding algorithm because the PC code in the polar code can only verify odd errors, an optimized parity check(OPC) code which can verify all odd errors as well as the half even errors is proposed. The OPC code is used to improve the PC-ASCL decoding algorithm, thus an OPC aided ASCL(OPC-ASCL) decoding algorithm is proposed. In the coding stage, the algorithm divides the information sequence into multiple segments, and places an OPC code at the end of each segment to verify the current information sequence, and places a cyclic redundancy check code at the end of the entire information sequence to verify the entire information sequence. In the decoding stage, the algorithm uses the OPC-ASCL decoder to decode. Simulation results show that compared to the PC-ASCL decoding algorithm, the OPC-ASCL decoding algorithm can reduce the complexity and obtain the certain performance gain. 展开更多
关键词 pc ascl decoding pc code adaptive successive cancellation list pc ascl divides information sequence multip parity check polar code optimized parity check coding stage
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Open-set blind recognition of non-binary LDPC codes 认领 引用 被引量:1
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作者 Ming Jiang Dongrui Huan +1 位作者 Shiqiu Liu Junhui Zhao 《Digital Communications and Networks》 SCIE EI CSCD 2026年第5期836-844,共9页
Blind encoder recognition methods have drawn much research interest in recent years,as they can play an important role in non-cooperative scenarios.This paper proposes an open-set blind recognition method for nonbinar... Blind encoder recognition methods have drawn much research interest in recent years,as they can play an important role in non-cooperative scenarios.This paper proposes an open-set blind recognition method for nonbinary Low-Density Parity-Check(LDPC)codes with high performance.We derive the principle of obtaining a non-binary Parity-Check Matrix(PCM)from the received signal and further apply the Gauss-Jordan Column Elimination(GJCE)over GF(q).An iterative process involving GJCE,LDPC decoding,and PCM sparsification is applied in our proposed method.The proposed symbol-level blind recognition is shown to perform much better than the bit-level one.Experimental results demonstrate that our proposed method can completely reconstruct the PCMs at a bit error rate of 0.4%for the moderate-length non-binary LDPC codes. 展开更多
关键词 Blind recognition Symbol-level Open-set Non-binary LDPC codes
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TLS Blind Recognition Algorithm of LDPC Codes 认领 引用
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作者 Ning Xiaoyan Sun Jingjing +1 位作者 Wang Zhenduo Sun Zhiguo 《China Communications》 SCIE EI CSCD 2026年第2期112-121,共10页
Blind recognition of low-density paritycheck(LDPC)codes has gradually attracted more attention with the development of military and civil communications.However,in the case of the paritycheck matrices with relatively ... Blind recognition of low-density paritycheck(LDPC)codes has gradually attracted more attention with the development of military and civil communications.However,in the case of the paritycheck matrices with relatively high row weights,the existing blind recognition algorithms based on a candidate set generally perform worse.In this paper,we propose a blind recognition method for LDPC codes,called as tangent function assisted least square(TLS)method,which improves recognition performances by constructing a new cost function.To characterize the constraint degree among received vectors and paritycheck vectors,a feature function based on tangent function is constructed in the proposed algorithm.A cost function based on least square method is also established according to the feature function values satisfying the parity-check relationship.Moreover,the minimum average value in TLS is obtained on the candidate set.Numerical analysis and simulation results show that recognition performances of TLS algorithm are consistent with theoretical results.Compared with existing algorithms,the proposed method possesses better recognition performances. 展开更多
关键词 blind recognition cost function least square low-density parity-check(LDPC)codes
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RAVE-Code:A Risk-Aware Verification Engine for AI-Generated Code Security Using Composite Risk Scoring and CWE-Conditioned Model Checking 认领 引用
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作者 Maher Alharby Ali Alssaiari 《Computers, Materials & Continua》 SCIE EI 2026年第10期609-628,共20页
Large Language Models(LLMs)are increasingly being used to generate source code.However,a substantial proportion of their output contains security vulnerabilities.Existing defenses typically apply uniform analysis to a... Large Language Models(LLMs)are increasingly being used to generate source code.However,a substantial proportion of their output contains security vulnerabilities.Existing defenses typically apply uniform analysis to all code fragments,irrespective of their risk profiles.This study presents RAVE-Code,a three-layer framework that calibrates the verification effort based on the risk associated with each detected weakness.The Detection layer employs Bandit for pattern-based static analysis,annotating findings with their respective Common Weakness Enumeration(CWE)classes.The Risk Scoring layer calculates a composite risk score for each weakness instance by integrating the Common Vulnerability Scoring System(CVSS)severity,the prevalence of CWEs in AI-generated code,and actual exploitability data.The Verification layer directs each code fragment to an appropriate depth of Bounded Model Checking(BMC)using the Efficient SMT-Based Bounded Model Checker(ESBMC),with solver parameters customized for each CWE class.The framework is evaluated on three public benchmarks.On SecurityEval,Bandit identifies 28.5%of vulnerabilities with zero false positives,establishing a baseline for static analysis coverage.On FormAI,RAVE-Code achieves a detection rate of 86.0%(F1=0.909),compared to 73.8%(F1=0.834)for uniform verification,and uniquely detects 41 vulnerabilities that uniform analysis misses.Because FormAI’s labels are based on ESBMC,these results show how consistent two ESBMC configurations rather than agreement with an independent standard.On the Juliet Test Suite,which provides structurally independent ground truth,RAVE-Code achieves a detection rate of 57.3%(F1=0.614)compared to 40.8%(F1=0.479),detecting a total of 104 vulnerabilities.Applying all flags uniformly results in a detection rate 18.8 percentage points lower than the proposed per-CWE tailoring.This indicates that detection gains arise from routing rather than flag selection. 展开更多
关键词 AI-generated code security bounded model checking vulnerability detection risk prioritisation static analysis CWE DevSecOps formal verification
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Computation-Efficient Decoding of LDPC Codes for High-Speed Space Laser Communications 认领 引用
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作者 Hu Zhuojun Chen Zhao +1 位作者 Kuang Linling Yin Liuguo 《China Communications》 SCIE EI CSCD 2025年第12期108-123,共16页
Space laser communication(SLC)is an emerging technology to support high-throughput data transmissions in space networks.In this paper,to guarantee the reliability of high-speed SLC links,we aim at practical implementa... Space laser communication(SLC)is an emerging technology to support high-throughput data transmissions in space networks.In this paper,to guarantee the reliability of high-speed SLC links,we aim at practical implementation of low-density paritycheck(LDPC)decoding under resource-restricted space platforms.Particularly,due to the supply restriction and cost issues of high-speed on-board devices such as analog-to-digital converters(ADCs),the input of LDPC decoding will be usually constrained by hard-decision channel output.To tackle this challenge,density-evolution-based theoretical analysis is firstly performed to identify the cause of performance degradation in the conventional binaryinitialized iterative decoding(BIID)algorithm.Then,a computation-efficient decoding algorithm named multiary-initialized iterative decoding with early termination(MIID-ET)is proposed,which improves the error-correcting performance and computation efficiency by using a reliability-based initialization method and a threshold-based decoding termination rule.Finally,numerical simulations are conducted on example codes of rates 7/8 and 1/2 to evaluate the performance of different LDPC decoding algorithms,where the proposed MIID-ET outperforms the BIID with a coding gain of 0.38 dB and variable node calculation saving of 37%.With this advantage,the proposed MIID-ET can notably reduce LDPC decoder’s hardware implementation complexity under the same bit error rate performance,which successfully doubles the total throughput to 10 Gbps on a single-chip FPGA. 展开更多
关键词 computation-efficient decoding highspeed decoders LDPC codes LLR initialization space laser communications
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Genetic Optimization of Non-Binary Quasi-Cyclic LDPC Codes 认领 引用
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作者 Zhang Yidi Jiang Ming Zhao Chunming 《China Communications》 SCIE EI CSCD 2025年第8期76-86,共11页
This paper proposes a genetic optimization method for the construction of non-binary quasi-cyclic low-density parity-check(NB-QC-LDPC)codes with short block lengths.In our scheme,the initial template base matrices and... This paper proposes a genetic optimization method for the construction of non-binary quasi-cyclic low-density parity-check(NB-QC-LDPC)codes with short block lengths.In our scheme,the initial template base matrices and the corresponding non-binary replacement matrices are constructed by the progressive edge growth algorithm and randomly generated,respectively.The genetic algorithm is then utilized to optimize the base matrices and the replacement ones.The simulation results show that the NB-QC-LDPC codes constructed by the proposed method achieve better decoding performance and lower implementation complexity compared to the existing NB-LDPC codes such as consultative committee for space data system and Bei Dou satellite navigation system. 展开更多
关键词 BDS CCSDS genetic algorithm nonbinary quasi-cyclic(NB-QC)LDPC codes
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基于误码置零的LDPC码稀疏校验矩阵重建 认领 引用
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作者 王忠勇 贺东旭 +2 位作者 巩克现 翟慧鹏 王玮 《系统工程与电子技术》 EI CSCD 北大核心 2026年第5期1765-1771,共7页
为提升高误码率、接收码字个数较少情况下低密度奇偶校验(low density parity check,LDPC)码稀疏校验矩阵重建性能,提出一种将含错码字置零和分层置信传播(layered belief propagation,LBP)译码相结合的算法。该算法基于随机抽取和高斯... 为提升高误码率、接收码字个数较少情况下低密度奇偶校验(low density parity check,LDPC)码稀疏校验矩阵重建性能,提出一种将含错码字置零和分层置信传播(layered belief propagation,LBP)译码相结合的算法。该算法基于随机抽取和高斯消元法获取稀疏校验向量,利用该校验向量对含错的接收码字进行校验,将校验不通过的码字置为零向量,提高了随机抽取迭代前期获取的稀疏校验向量个数。当稀疏校验向量个数到达阈值后使用LBP译码方法纠正错误比特,提升了LDPC码稀疏校验矩阵的重建率。仿真结果表明,对于IEEE802.11n协议下的(648,324)LDPC码,所提算法在高误码率且接收码字个数较少的条件下,稀疏校验矩阵重建率可达84%,相比现有算法提升了约40%,有效提高了重建算法的容错能力。 展开更多
关键词 低密度奇偶校验 稀疏校验矩阵 随机抽取 误码置零 重建算法
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Construction of Rate-Compatible(RC) Low-Density Parity-Check(LDPC) Convolutional Codes Based on RC-LDPC Block Codes 认领 引用 被引量:1
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作者 穆丽伟 韩国军 刘志勇 《Journal of Shanghai Jiaotong university(Science)》 EI 2016年第6期679-683,共5页
In this paper,a family of rate-compatible(RC) low-density parity-check(LDPC) convolutional codes can be obtained from RC-LDPC block codes by graph extension method.The resulted RC-LDPC convolutional codes,which are de... In this paper,a family of rate-compatible(RC) low-density parity-check(LDPC) convolutional codes can be obtained from RC-LDPC block codes by graph extension method.The resulted RC-LDPC convolutional codes,which are derived by permuting the matrices of the corresponding RC-LDPC block codes,are systematic and have maximum encoding memory.Simulation results show that the proposed RC-LDPC convolutional codes with belief propagation(BP) decoding collectively offer a steady improvement on performance compared with the block counterparts over the binary-input additive white Gaussian noise channels(BI-AWGNCs). 展开更多
关键词 rate-compatible(RC) low-density parity-check(LDPC) convolutional codes systematic maximum encoding memory belief propagation(BP) decoding
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基于Stanley序列与遗传算法的短码长QC-LDPC码构造方法 认领 引用
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作者 袁建国 胡坤 熊龙宇 《半导体光电》 CAS 北大核心 2026年第3期589-594,共6页
针对准循环低密度奇偶校验(QC-LDPC)码易存在短环结构且在短码长易出现小陷阱集导致错误平层的问题,基于Stanley序列的特性,结合遗传算法提出一种环长至少为8的短码长QC-LDPC码构造方法。该方法首先利用Stanley序列构造指数矩阵的前两行... 针对准循环低密度奇偶校验(QC-LDPC)码易存在短环结构且在短码长易出现小陷阱集导致错误平层的问题,基于Stanley序列的特性,结合遗传算法提出一种环长至少为8的短码长QC-LDPC码构造方法。该方法首先利用Stanley序列构造指数矩阵的前两行,借助其序列特性天然避免四环;再通过引入遗传算法搜索第三行元素,在确保无四六环的同时,对(5,3)和(6,4)等危害性小陷阱集的数量进行最小化;最后将指数矩阵扩展为奇偶校验矩阵,完成QC-LDPC码构造。仿真结果表明,在误码率为1×10-6时,所构造的短码长SS-QC-LDPC码相较于其他三种具有相同码率和码长的QC-LDPC码型,具有更好的净编码增益且没有出现错误平层现象。因此,所提方法的纠错性能更佳且短码长更易于编译码实现。 展开更多
关键词 准循环低密度奇偶校验码 Stanley序列 遗传算法 短码长
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一种LDPC码的自适应分层阈值最小和译码算法 认领 引用
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作者 袁建国 熊龙宇 胡坤 《半导体光电》 CAS 北大核心 2026年第1期158-163,共6页
针对低密度奇偶校验码的最小和译码算法性能有限及传统译码算法收敛速度较慢等问题,提出一种自适应分层阈值最小和(Adaptive Layered Threshold Min-Sum,ALTMS)译码算法。该算法结合阈值归一化最小和译码算法与阈值偏移最小和译码算法... 针对低密度奇偶校验码的最小和译码算法性能有限及传统译码算法收敛速度较慢等问题,提出一种自适应分层阈值最小和(Adaptive Layered Threshold Min-Sum,ALTMS)译码算法。该算法结合阈值归一化最小和译码算法与阈值偏移最小和译码算法的优势,通过动态调整修正因子,使其随迭代次数自适应变化。同时,采用分层调度方式,有效提升了算法收敛速度和译码性能。仿真结果表明,与分层调度下的四种阈值最小和译码算法相比,所提出的ALTMS译码算法实现了一定的性能增益,相比使用固定修正因子的最小和译码算法展现出更优越的纠错性能。 展开更多
关键词 低密度奇偶校验码 最小和译码算法 分层调度 修正因子 迭代次数
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Edges Metric Constrained PEG Algorithm for Designing LDPC Codes 认领 引用
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作者 Qin Xin Yang Chuanchuan +3 位作者 Jiang Xiaotian Hu Jiazhe Wang Xinyue Wang Ziyu 《China Communications》 SCIE EI CSCD 2025年第10期179-185,共7页
The progressive edge-growth(PEG)al-gorithm is a general method to construct short low-density parity-check(LDPC)codes and it is a greedy method to place each edge with large girths.In order to improve the performance ... The progressive edge-growth(PEG)al-gorithm is a general method to construct short low-density parity-check(LDPC)codes and it is a greedy method to place each edge with large girths.In order to improve the performance of LDPC codes,many im-proved PEG(IPEG)algorithms employ multi metrics to select surviving edges in turn.In this paper,the pro-posed edges metric(EM)based on message-passing algorithm(MPA)is introduced to PEG algorithm and the proposed EM constrained PEG(EM-PEG)algo-rithm mainly considers the independence of message passing from different nodes in Tanner graph.The numerical results show that our EM-PEG algorithm brings better bit error rate(BER)performance gains to LDPC codes than the traditional PEG algorithm and the powerful multi-edge multi-metric constrained PEG algorithm(MM-PEGA)proposed recently.In ad-dition,the multi-edge EM constrained PEG(M-EM-PEG)algorithm which adopts multi-edge EM may fur-ther improve the BER performance. 展开更多
关键词 low-density parity-check(LDPC)codes message-passing algorithm(MPA) progressive edge-growth(PEG)algorithm
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面向OCC系统的QC-LDPC编译码算法设计与实现 认领 引用
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作者 闫晓明 石迪 +2 位作者 籍风磊 王铭阳 王勇 《吉林大学学报(信息科学版)》 CAS 2026年第4期749-755,共7页
针对可见光信道中的干扰较强,且现阶段OCC(Optical Camera Communication)系统的编码技术纠错性能不足,造成OCC系统可靠性降低的问题,提出了一种面向OCC系统的QC-LDPC(Quasi-Cyclic Low Density Parity Check Code)编译码算法。根据OCC... 针对可见光信道中的干扰较强,且现阶段OCC(Optical Camera Communication)系统的编码技术纠错性能不足,造成OCC系统可靠性降低的问题,提出了一种面向OCC系统的QC-LDPC(Quasi-Cyclic Low Density Parity Check Code)编译码算法。根据OCC系统的结构特点以及信道链路特性,确定具有结构化设计和低复杂度译码特性的QC-LDPC码作为纠错码型,采用快速编码算法减小编码过程的运算复杂度;结合归一化最小和算法和分层译码算法的各自特点提出了一种改进的L-MS(Layer-Min Sum)译码算法。OCC系统实验平台测试结果表明,在室内环境通信场景下,OCC系统的误码率为3.16×10-6,通信速率为2850.4 bit/s;在室外环境通信场景下,OCC系统的误码率为9.07×10-6,通信速率为2797.9 bit/s,在保证低误码率的同时,兼顾了数据的传输速率。 展开更多
关键词 可见光相机通信 编译码 LDPC 现场可编程门阵列 帧结构
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RIS辅助的SC-LDPC乘积码中继协作码的构造与交替译码研究 认领 引用
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作者 杨晨 张顺外 《无线电工程》 2026年第4期574-581,共8页
针对基于可重构智能表面(Reconfigurable Intelligent Surface,RIS)辅助的空间耦合低密度奇偶校验(Spatially-Coupled Low Density Parity Check,SC-LDPC)乘积码中继协作展开研究。信源节点通过SC-LDPC乘积码对信息矩阵行编码,并通过中... 针对基于可重构智能表面(Reconfigurable Intelligent Surface,RIS)辅助的空间耦合低密度奇偶校验(Spatially-Coupled Low Density Parity Check,SC-LDPC)乘积码中继协作展开研究。信源节点通过SC-LDPC乘积码对信息矩阵行编码,并通过中继节点对信息矩阵列编码;为进一步提升编码增益,采用基于复制与掩码(Replication and Masking,R&M)代数构造方法对SC-LDPC码的校验矩阵消环设计。该方法通过系统性地消除校验矩阵中的短环结构,显著提升了码字的围长,降低了误码平层。目的节点对接收的2路信号进行SC-LDPC乘积码行译码与列译码的交替译码,通过在行与列2个维度之间实时交换软信息,使译码器可以更及时地识别并纠正潜在错误,有效提升了迭代收敛速度与译码可靠性。仿真结果表明,基于R&M代数构造的SC-LDPC乘积码相较于一般SC-LDPC乘积码具有更优性能;列译码和行译码的信息交互也有助于提高译码效率,降低误码率(Bit Error Rate,BER)。 展开更多
关键词 可重构智能表面 空间耦合低密度奇偶校验 乘积码 校验矩阵 编码中继协作 交替迭代译码
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神经网络辅助的非二进制量子LDPC码置信传播译码研究 认领 引用
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作者 张千辉 樊继豪 《南京理工大学学报》 CAS CSCD 北大核心 2026年第2期220-229,共10页
置信传播(BP)算法在量子低密度奇偶校验(LDPC)码译码问题上取得了许多进展。该文针对非二进制条件下的量子短环和错误简并问题,提出了一种新的基于递归神经网络的置信传播(RNBP)译码方案。具体的,在损失函数部分,RNBP将适用于经典错误... 置信传播(BP)算法在量子低密度奇偶校验(LDPC)码译码问题上取得了许多进展。该文针对非二进制条件下的量子短环和错误简并问题,提出了一种新的基于递归神经网络的置信传播(RNBP)译码方案。具体的,在损失函数部分,RNBP将适用于经典错误模式的交叉熵损失与适用于量子错误模式的逻辑损失相结合,并为这个损失函数设置了一个超参数,以便更好地完成这项多目标任务。仿真结果表明,RNBP译码方案缓解了量子短环问题,以较高的概率检测出简并错误。在该文测试的标准CSS形式的量子码上,RNBP方案译码效果优于传统BP,将逻辑错误率从10-2抑制到10-3与10-4之间。该文的RNBP方案还考虑了非对称信道译码,性能同样优于传统BP。在XZZX形式的扭曲量子码上,将传统BP所能达到的逻辑错误率从10-2抑制到10-3左右。 展开更多
关键词 量子LDPC 神经网络译码 量子简并 非对称信道
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面向6G的速率兼容LDPC码设计 认领 引用
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作者 王汶振 李华安 +1 位作者 朱敏 白宝明 《移动通信》 2026年第5期2-6,18,共5页
面向6G高吞吐应用场景,提出了一种基于5G LDPC(Low-Density Parity-Check)码的速率兼容QC-LDPC码设计方法。现有5G LDPC码在下行链路中最高支持约20 Gbps的数据速率,已难以满足未来更高吞吐的需求。基于此,通过扩展5G LDPC码所支持的提... 面向6G高吞吐应用场景,提出了一种基于5G LDPC(Low-Density Parity-Check)码的速率兼容QC-LDPC码设计方法。现有5G LDPC码在下行链路中最高支持约20 Gbps的数据速率,已难以满足未来更高吞吐的需求。基于此,通过扩展5G LDPC码所支持的提升因子范围,构造了一类新的QC-LDPC码。从环结构优化的角度出发,基于最大围长与最少最短环数量准则,针对大尺寸提升因子提出了一种系统化设计方法。仿真结果表明,与DVB-S2短帧LDPC码相比,所设计的速率兼容LDPC码可获得0.2~0.3 dB的性能增益。该方法不仅适用于6G高吞吐通信场景,同时也适用于未来星地融合通信系统。 展开更多
关键词 6G LDPC 速率兼容 星地融合通信
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星地激光通信RS-LDPC级联码抗干扰优化 认领 引用
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作者 尹辉 俞建杰 +1 位作者 刘永伦 邬佳杰 《计算机测量与控制》 2026年第8期196-206,共11页
星地激光通信因大气湍流、云层遮挡及平台震动等因素可能引发随机与突发混合干扰,信道编码作为关键的纠错技术备受重视;为提升星地激光通信的信道译码性能、提高信息传输效率并降低译码复杂度,设计了将RS码与LDPC码级联的编码方案;为有... 星地激光通信因大气湍流、云层遮挡及平台震动等因素可能引发随机与突发混合干扰,信道编码作为关键的纠错技术备受重视;为提升星地激光通信的信道译码性能、提高信息传输效率并降低译码复杂度,设计了将RS码与LDPC码级联的编码方案;为有效刻画混合干扰特性,采用了GE-AWGN级联模型作为信道建模基础,引入含素数模自适应交织器与层间双向反馈的RS-LDPC串行级联编码架构构建分层纠错体系,提出了基于导频辅助法的动态参数调节策略优化码率、LDPC迭代次数及交织深度配置,依托Matlab仿真平台验证了方案性能;经仿真结果表明,与未编码相比,RS-LDPC级联编码在误码率时性能优于单一LDPC码或RS码约1.5 dB,动态参数调节在低信噪比下显著提升了纠错效果,在高信噪比下有效提高了传输吞吐量,自适应交织器高效离散了突发错误;经实验测试该信道模型与编码方案适配星地激光通信混合干扰场景,满足了抗干扰传输技术在该领域的实际应用需求。 展开更多
关键词 激光通信 RS码 LDPC 级联码 动态参数优化
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基于QC-LDPC编码的海洋湍流光通信多调制格式性能对比实验研究 认领 引用
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作者 闫军 张鹏 +4 位作者 于浩 张鹏浩 张宇涵 徐进 佟首峰 《光子学报》 EI CAS CSCD 北大核心 2026年第2期156-172,共17页
针对海洋湍流造成光强起伏恶化水下光通信性能问题,基于对数正态分布建立水下无线光通信弱湍流信道数学模型,仿真分析准循环低密度奇偶校验编码在不同调制格式、闪烁指数、编码长度等参数下的编码增益规律和通信特性。仿真结果表明,在1... 针对海洋湍流造成光强起伏恶化水下光通信性能问题,基于对数正态分布建立水下无线光通信弱湍流信道数学模型,仿真分析准循环低密度奇偶校验编码在不同调制格式、闪烁指数、编码长度等参数下的编码增益规律和通信特性。仿真结果表明,在10 m传输距离下差分相移键控调制加入编码后系统误码率下降至4×10−5,对于开关键控和二进制相移键控在低信噪比时加入编码后带来的性能提升可能不足以抵消译码复杂度的增加,从而导致误码率升高。搭建了基于模拟海洋湍流水池的蓝绿光激光通信实验平台,进行通信距离1.5 m、通信速率10 Mbps的准循环低密度奇偶校验编码海洋湍流光通信多调制格式通信性能对比实验研究,引入闪烁指数δI2衡量湍流强度大小。实验结果表明当误码率为10−5量级时,准循环低密度奇偶校验编码在自来水、温致湍流(δI2=0.056)、盐致湍流(δI2=0.034)环境下对开关键控调制的编码增益分别为0.46 dB、0.49 dB、1.31 dB;对差分相移键控调制的编码增益分别为0.83 dB、0.79 dB、1.63 dB。准循环低密度奇偶校验编码在弱湍流信道中对差分相移键控调制的编码增益较高,并在盐致湍流环境中有较高的编码增益,抗干扰效果更好。 展开更多
关键词 水下光通信 海洋弱湍流 对数正态分布湍流模型 差分相移键控 准循环低密度奇偶校验码 闪烁指数
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50Gbit/sPON场景下高速LDPC编码器设计 认领 引用
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作者 孙邦 李祥辉 +1 位作者 张艳 肖进胜 《光通信研究》 北大核心 2026年第3期71-77,共7页
【目的】低密度奇偶校验(LDPC)码由于接近香农极限的纠错性能,取代里德-所罗门(RS)码成为50 Gbit/s无源光网络(PON)场景下新的前向纠错码(FEC),但是其本身编码以及协议中译码矩阵的高复杂性使其难以在硬件上实现。【方法】文章改进了R. ... 【目的】低密度奇偶校验(LDPC)码由于接近香农极限的纠错性能,取代里德-所罗门(RS)码成为50 Gbit/s无源光网络(PON)场景下新的前向纠错码(FEC),但是其本身编码以及协议中译码矩阵的高复杂性使其难以在硬件上实现。【方法】文章改进了R. Urbanke(RU)编码算法使其支持译码矩阵的列交换,并在此基础上设计了3段式流水线高速编码架构,该架构资源消耗低,无需等到收集完固定长度的信息位,编码时延低,能够支持任意码型,同时针对丢失指示等异常情况进行了健壮性设计。【结果】文章基于统一验证方法学(UVM)验证,代码覆盖率达到98%,编码器能够正确处理协议规定的3种码型,应对各种异常情况,在Intel Stratix 10现场可编程门阵列(FPGA)开发板上进行FPGA原型验证,4个编码器的逻辑资源占用只有14%,数据吞吐量达到50 Gbit/s。【结论】文章所提改进RU编码算法和3段式流水高速编码架构在硬件实现中以低时延和低资源消耗实现了50 Gbit/s的数据吞吐量,能够正确处理协议规定的所有码型并有效应对各种异常情况,为50 Gbit/s PON场景中LDPC编码器的硬件部署提供了一种高效可行的解决方案,具有重要的应用前景。 展开更多
关键词 无源光网络 数字电路设计 低密度奇偶校验码 高速编码器
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5G-LDPC码编码调制重传的交织优化 认领 引用
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作者 仲锌宇 顾鹏宇 +1 位作者 姜明 王强 《移动通信》 2026年第5期51-59,66,共9页
针对LDPC(Low-Density Parity-Check Codes)码的HARQ(Hybrid Automatic Repeat Request)机制,对5G的编码调制与交织优化展开研究。首先分析了5G系统中的速率匹配与现有的交织方式,利用PEXIT(Protograph-based Extrinsic Information Tra... 针对LDPC(Low-Density Parity-Check Codes)码的HARQ(Hybrid Automatic Repeat Request)机制,对5G的编码调制与交织优化展开研究。首先分析了5G系统中的速率匹配与现有的交织方式,利用PEXIT(Protograph-based Extrinsic Information Transfer Analysis)算法对重传交织方式进行理论分析与门限计算,并探索了不同编码调制方案多次重传的交织方式对接收性能的影响;然后利用PEXIT算法针对不同冗余版本(RV0、RV1、RV2、RV3)提出了交织优化算法,以提升整体的接收性能。仿真结果显示,通过优化交织方式,各冗余版本数据在合并译码时可实现0.2~0.5 dB的性能提升,从而显著提高了高阶调制重传系统的传输性能,为5G及未来6G通信系统中针对多次重传的编码调制方案设计提供了新的思路和实现方法。 展开更多
关键词 低密度奇偶校验码 交织优化 PEXIT算法
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