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CS-FSCL decoding algorithm of polar codes based on critical sets

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Optoelectronics Letters 2024年第7期20卷 418-423页

作者： yuan jianguo ZHANG Fengguo HE Jingjie PANG Yu School of Optoelectronic Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China1

In order to reduce the number of redundant candidate codewords generated by the fast successive cancellation list(FSCL)decoding algorithm for polar codes,a simplified FSCL decoding algorithm based on critical sets(CS-FSCL)of polar codes is *** algorithm utilizes the number of information bits belonging to the CS in the special nodes,such as Rate-1 node,repetition(REP)node and single-parity-check(SPC)node,to constrain the number of the path splitting and avoid the generation of unnecessary candidate codewords,and thus the latency and computational complexity are ***,the algorithm only flips the bits corresponding to the smaller log-likelihood ratio(LLR)values to generate the sub-maximum likelihood(sub-ML)decoding codewords and ensure the decoding *** results show that for polar codes with the code length of 1024,the code rates of 1/4,1/2 and 3/4,the proposed CS-FSCL algorithm,compared with the conventional FSCL decoding algorithm,can achieve the same decoding performance,but reduce the latency and computational complexity at different list ***,under the list size of L=8,the code rates of R=1/2 and R=1/4,the latency is reduced by 33%and 13%and the computational complexity is reduced by 55%and 50%,respectively.

关键词： algorithm FSC critical

基于改进第一关键集的极化码SCLF译码算法

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北京邮电大学学报 2024年第2期47卷 74-80页

作者：袁建国贺京杰张丰果黄胜重庆邮电大学通信与信息工程学院重庆400065

为了改进极化码串行抵消列表比特翻转(SCLF)译码算法的误码性能,通过分析已完成译码的比特对未译码比特的影响,提出了一种优化SCLF译码算法的算法,改进了关键集精度。以第一关键集(FCS)作为初始关键集,通过计算比特不可靠度的理论值与... 详细信息

为了改进极化码串行抵消列表比特翻转(SCLF)译码算法的误码性能,通过分析已完成译码的比特对未译码比特的影响,提出了一种优化SCLF译码算法的算法,改进了关键集精度。以第一关键集(FCS)作为初始关键集,通过计算比特不可靠度的理论值与实际值,筛选出FCS中包含串行抵消状态路径的错误比特,并按信道可靠度升序排列形成改进第一关键集(IFCS)。用IFCS能有效提高翻转准确性并减少重译码次数。仿真结果表明,所提算法相较于基于修正关键集的SCLF译码算法和决策后处理SCLF译码算法具有更好的误码性能和更低的复杂度,同时还可以与小列表循环冗余校验辅助SCL(CA-SCL)译码算法结合,达到大列表CA-SCL译码算法的性能水平。

关键词：极化码第一关键集串行抵消列表比特翻转

一种LDPC码的优化分层阈值偏移最小和译码算法

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电讯技术 2024年第9期64卷 1415-1419页

作者：袁建国张育宁王姿现庞宇重庆邮电大学光电工程学院重庆400065

针对低密度奇偶校验(Low-Density Parity-Check,LDPC)码的译码算法在高信噪比区域性能较差和传统的泛洪调度译码方式收敛速度较慢等问题,提出了一种优化的分层阈值偏移最小和(Improved Layered Threshold Offset Min-Sum,ILTOMS)LDPC译... 详细信息

针对低密度奇偶校验(Low-Density Parity-Check,LDPC)码的译码算法在高信噪比区域性能较差和传统的泛洪调度译码方式收敛速度较慢等问题,提出了一种优化的分层阈值偏移最小和(Improved Layered Threshold Offset Min-Sum,ILTOMS)LDPC译码算法。该算法通过在最小值近零处添加一个阈值,在最小值小于该阈值的情况下选择局部最优的算法规避偏移最小和(Offset Min-Sum,OMS)译码算法的归零损失,在最小值较大时设置一个阈值来改善高信噪比时的译码性能,并且采用分层调度的方式进一步提高译码性能。仿真结果表明,所提的ILTOMS译码算法在复杂度无明显变化的情况下有一定性能增益,相比其他两种译码算法译码性能分别提升了0.4 dB和0.45 dB。

关键词：低密度奇偶校验码泛洪调度分层调度偏移最小和算法

基于Golomb Ruler的QC-LDPC码构造方法

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半导体光电 2024年第4期45卷 675-680页

作者：袁建国刘雯漪宋万闯伏博文重庆邮电大学光电工程学院重庆400065

针对准循环低密度奇偶校验(QC-LDPC)码中短环结构会影响其纠错性能的问题,基于Golomb Ruler提出了一种新颖的围长为8的QC-LDPC码构造方法。该方法先根据码长码率的需求,从Golomb Ruler中选择部分元素构造一个集合,结合指数矩阵中元素所... 详细信息

针对准循环低密度奇偶校验(QC-LDPC)码中短环结构会影响其纠错性能的问题,基于Golomb Ruler提出了一种新颖的围长为8的QC-LDPC码构造方法。该方法先根据码长码率的需求,从Golomb Ruler中选择部分元素构造一个集合,结合指数矩阵中元素所在位置的四六环特性,通过搜索算法,依次找出符合无四六环条件的元素得到另一个集合,然后构造相应的指数矩阵,最后得到其奇偶校验矩阵。仿真结果表明:在误码率为10^(-6)时,所构造的GR-QC-LDPC码与同码率码长的其他4种QC-LDPC码的码型相比,其净编码增益均有一定的提高,且无明显错误平层现象。

关键词：准循环低密度奇偶校验码 Golomb Ruler 围长约束净编码增益

地球系统科学视角下美国湿地保护修复的经验及启示--以大沼泽地综合修复计划为例

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地质通报 2024年第8期43卷 1305-1314页

作者：胡雅璐张万益王泉袁建国杜璨中国地质调查局发展研究中心北京100037

湿地作为地球上初级生产力最高、生物多样性最丰富的生态系统,受到人类活动、气候变化等多种因素影响,正在遭遇全球性的退化危机。近几十年来,美国在地球系统科学指导下建立了全面的湿地保护法律体系、科学的生态系统修复理念、多部门... 详细信息

湿地作为地球上初级生产力最高、生物多样性最丰富的生态系统,受到人类活动、气候变化等多种因素影响,正在遭遇全球性的退化危机。近几十年来,美国在地球系统科学指导下建立了全面的湿地保护法律体系、科学的生态系统修复理念、多部门分工协作机制,形成了一套较完善的湿地保护修复模式,值得中国学习和借鉴。以美国大沼泽地综合修复计划为例,对其生态修复工作模式进行了综述,通过系统对比研究,发现中国湿地保护修复工作存在管理机制待完善、理念科学性不足、调查监测体系待加强等。建议设立国家湿地生态修复大科学计划,聚焦湿地生态系统中的土壤、水文条件等关键问题,建设全国湿地监测网络,建立综合调查、实时监测、及时预警、动态调整的湿地生态修复工作模式。

关键词：湿地生态系统保护和修复地球系统科学美国大沼泽地

Simplified SCL decoding algorithm of polar codes based on critical sets

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Optoelectronics Letters 2023年第6期19卷 364-369页

作者： yuan jianguo ZHANG Fengguo HE Jingjie HUANG Sheng Chongqing Key Laboratory of Photoelectronic Information Sensing and Transmitting Technology Chongqing University of Posts and TelecommunicationsChongqing 400065China

In order to reduce the high complexity of the successive cancellation list(SCL) algorithm for polar codes,a simplified SCL decoding algorithm based on critical sets(CS-SCL decoding algorithm) is *** algorithm firstly constructs the critical sets according to the channel characteristics of the polar codes as well as comprehensively considering both the minimum Hamming weight(MHW) of the information bits and the channel *** information bits within the critical sets and the path splitting are still performed by the SCL decoding algorithm while the information bits outside the critical sets are directly performed by the hard ***,the number of path ordering,copying,and deleting can be reduced during ***,the computational complexity of the SCL decoding can also be *** results demonstrate that the decoding complexity of the proposed CS-SCL decoding algorithm,compared with the conventional SCL decoding algorithm,is reduced by at least 70%,while compared with the simplified SCL(PS-SS-SCL) algorithm which constructs the critical set with the first and second information bits of the Rate-1 nodes,its decoding complexity can also be ***,the loss of the error correction performance for the proposed CS-SCL decoding algorithm is ***,the proposed CS-SCL algorithm is effective and can provide a reasonable tradeoff between the decoding performance and complexity for the decoding algorithm of polar codes.

关键词： critical algorithm complexity

An improved AS-SCLF decoding algorithm of polar codes based on the assigned set

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Optoelectronics Letters 2022年第11期18卷 694-698页

作者： You Wei yuan jianguo YU Linfeng HUANG Sheng Chongqing Key Laboratory of Photoelectronic Information Sensing and Transmitting Technology Chongqing University of Posts and TelecommunicationsChongqing 400065China

An improved successive cancellation list bit-flip based on assigned set(AS-SCLF) decoding algorithm is proposed to solve the problems that the successive decoding of the successive cancellation(SC) decoder has error propagation and the path extension of the successive cancellation list(SCL) decoder has the decision errors in the traditional cyclic redundancy check aided successive cancellation list(CA-SCL) decoding algorithm. The proposed algorithm constructs the AS firstly. The construction criterion is to use the Gaussian approximation principle to estimate the reliabilities of the polar subchannel and the error probabilities of the bits under SC decoding, and the normalized beliefs of the bits in actual decoding are obtained through the path metric under CA-SCL decoding, thus the error bits containing the SC state are identified and sorted in ascending order of the reliability. Then the SCLF decoding is performed. When the CA-SCL decoding fails for the first time, the decision results on the path of the SC state in the AS are exchanged. The simulation results show that compared with the CA-SCL decoding algorithm, the SCLF decoding algorithm based on the critical set and the decision post-processing decoding algorithm, the improved AS-SCLF decoding algorithm can improve the gain of about 0.29 dB, 0.22 dB and 0.1 dB respectively at the block error rate(BLER) of 10-4 and reduce the number of decoding at the low signal-to-noise ratio(SNR), thus the computational complexity is also reduced.

关键词： decoder algorithm successive

A new construction method of LDPC codes for optical transmission systems

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Frontiers of Optoelectronics 2012年第3期5卷 311-316页

作者： jianguo yuan Yuexing JIA Wenjuan BI Liang XU Key Laboratory of Optical Fiber Communications Technology Chongqing University of Posts and Telecommunications Chongqing 400065 China

Based on the construction method of system- atically constructed Gallager （SCG）（4, k） code, a new improved construction method of low density parity check （LDPC） code is proposed. Compared with the construction method of SCG（4, k） codes improved before, the proposed construction method has some advantages, such as saving storage space and reducing computation complexity in the hardware implementation. And then LDPC（5929, 5624） code with 5.42% redundancy is constructed by the proposed method. The simulation results and analysis show that the constructed LDPC（5929, 5624） code has better error-correction performance, lower redundancy and lower decoding complexity than those of a classic Reed- Solomon （RS）（255, 239） code. Therefore, LDPC（5929, 5624） code, constructed by the proposed construction method on LDPC codes, can better suitable for optical transmission systems.

关键词： low density parity check (LDPC) codes netcoding gain (NCG) construction method optical transmis-sion systems

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城市地质安全风险评价理念发展与启示

化工矿产地质 2024年第2期46卷 160-167页

作者：袁建国张万益杜璨胡雅璐中国地质调查局发展研究中心北京100037

近年来,随着中国城镇化程度逐步提高,城市地质安全风险评价日益受到重视。全球气候变化,粗放的城镇化方式以及多重灾害的交互作用使国内外城市地质安全风险面临更加复杂的形势;相应地,对城市地质安全风险评价理念和技术也取得了重要进... 详细信息

近年来,随着中国城镇化程度逐步提高,城市地质安全风险评价日益受到重视。全球气候变化,粗放的城镇化方式以及多重灾害的交互作用使国内外城市地质安全风险面临更加复杂的形势;相应地,对城市地质安全风险评价理念和技术也取得了重要进展。国际社会经历了从灾害治理到灾害风险治理的转变过程,并逐渐意识到系统性多重灾害风险在城市地质安全评价中的作用;进一步提出了基于生态系统的减少灾害风险的治理理念和方法,同时开发了更加全面的数字产品。本文据此提出,中国要加强城市多重灾害调查和系统性地质安全风险的研究;深刻理解基于生态系统的减少灾害风险理念,提高治理成效;积极探索多重灾害情景下的治理措施;并提高开发数字产品的能力。

关键词：城市地质安全风险评价系统性风险多重灾害调查