- QC LDPC FBMC systemvue M. 6) For an arbitrary girth-10+ (3,L) QC-LDPC code and a special class of girth-12 (3,L) QC-LDPC code, LDPC coded FS-FBMC/OQAM system because of its adequate BER performance, reasonable PAPR performance, and reduced computational complexity was found to be an appropriate 文章浏览阅读933次。在qc-ldpc中，这个矩阵被构造为更小的矩阵块的排列，这些小矩阵块要么是零矩阵，要么是置换矩阵（一个单位矩阵经过行或列的置换得到）。qc 这种方法构造出来的qc-ldpc码可以有效地避免短环，且l-qc-ldpc的围长至少为8；特别地，该方法构造码的码型都具有一定的结构特征、计算复杂度低、易于硬件实现且p值的下界允许连续取 节点相连，当LDPC 码的码长变得更长时，矩阵的稀疏性也就更好。 准循环LDPC (QC-LDPC, Quasi-Cyslic Low-Density Parity-Check Codes)是一种几何化的LDPC 编码， 它的校验矩阵可 仿真结果表明,经过qc-ldpc编码后的性能得到改善。不同码长和码率的qc-ldpc码在不同信噪比snr条件下的误码率性能差异较大。在相同snr条件下对于同一码字,ppm调制阶数越高,误码率越低。同一码长不同码率的码字在相同调制阶数条 LDPC码[1]（Low-Density Parity-Check Code）已经被证明是实用的好码，因其优异的纠错性能和高效的迭代译码算法而具有广阔的应用前景。QC-LDPC码(Quasi-Cyclic qc-ldpc 码是一种特殊的 ldpc 码，其校验矩阵具有准循环结构。qc-ldpc 码的结构可以分为两个部分：一部分是固定的循环矩阵，另一部分是可变的矩阵。这种结构使得 qc-ldpc 码在存储和计算 1. of. Quasi-cyclic (QC)-LDPC as a 准循环 LDPC 码(Quasi-Cycle,QC-LDPC)是 LDPC 码中重要的一类,是指一个码字以右移或左移固定位数的符号位得到的仍是一个码字。QC-LDPC 码的校验矩阵是由循环子矩阵的阵列组成，相对于其他类型的 LDPC 码，在编 The filter-bank multi-carrier (FBMC) with offset quadrature amplitude modulation (OQAM) is considered a promising waveform for 5G due to its favorable frequency-time localization and 环路模式的方法。Wu利用多项式校验矩阵[7]提出 了一种不需要枚举环路模式就可以直接判断QC LDPC码（和广义QCLDPC码）围长的方法，但是这 最常用的LDPC码是QC⁃LDPC码，QC⁃LDPC码 的H矩阵结构可以被分为m×n个子矩阵，即基矩 阵，每个基矩阵均为L×L的方阵，即M＝m×L和N These QC-LDPC codes are not designed for achieving optimal coding properties, but for easily building a triangular matrix for a Construction D' lattice that is to be used in power-constrained LDPC码作为一种线性分组码，具备优异的纠错性能，被广泛应用在无线通信中的信道编码领域。采用QC-LDPC生成矩阵的编码方法，设计了一个支持多码率准循环低密度校验码的编码器， PDF | In this work, we consider constructions of type-II quasi-cyclic (QC) low-density parity-check (LDPC) codes with girth eight from a Sidon sequence. 文章浏览阅读4. An LDPC-C FBMC wave design, which has a su perior spectral efficiency, com- pared to cyclic prefix (CP)-OF DM. This helps save An SC-LDPC code is an LDPC convolutional (LDPC-C) code viewed from a graphical point of view (or a spatial coupling point of view) [49, 104, 66, 67, 92]. constructHG folder) Secondly,realizing the fast A data packing technique for QC-LDPC codec RTL min-sum layer decoding architecture Topics. 11、IEEE 802. The matrix H is uniquely defined by the matrix H B G, extended permutation matrix P (also PCM), and lifting The LDPC code is a binary linear block code of length N defined by a sparse parity-check matrix H of dimension (M × N). Also UFMC is 1. N2 - In this paper, we aim at LDPC coded FS-FBMC/OQAM system because of its adequate BER performance, reasonable PAPR performance, and reduced computational complexity was found to be an appropriate B. According to the encoding algorithm proposed in [], This paper introduces hardware architectures for encoding Quasi-Cyclic Low-Density Parity Check (QC-LDPC) codes. El Mezeni and Andreja Radoševi´c. PY - 2011. 摘要： 考虑到围长(girth)对低密度奇偶校验(LDPC)码的影 响,提出了一种利用遗传算法构造大girth的准循环LDPC( QC-LDPC)码的新方法. 6k次，点赞2次，收藏39次。目录硬判决位翻转译码软判决位翻转译码软硬判决翻转译码算法的性能对比对于线性分组码，译码的复杂度随码长呈指数增加，传统 A High-level synthesis (HLS) based QC-LDPC encoder microarchitecture is proposed, which designs a fine-grained partially-parallel iterative process execution to exploit intra-codeword 本文就ldpc码的发展以及研究现状进行了简单的介绍,并对二进制ldpc码和多进制ldpc码,以及多进制qc-ldpc码的表示、定义、编码译码方式做了系统的阐述。 并重点研究了QC-LDPC码校验矩阵 2. Reference: Full-Length Row-Multiplier QC-LDPC Codes With Girth Eight and Short For the system of FBMC 提出了一种优化循环转移矩阵偏量候选集合的结构化准循环低密度奇偶校验(qc-ldpc)码构造算法. However, constructing these LDPC codes with 本文介绍专门为5G先进技术研究开发而设计的验证测试平台，基于是德科技SystemVue系统设计仿真软件，M8190A超宽带任意波发生器，E8267D微博矢量信号发生 It has been shown that QC-LDPC code with a Tanner graph free of short cycles and free of some harmful combination of small cycles (known as "trapping sets") has better 该文提出一种通过合理设置零矩阵构造可逆准循环低密度奇偶校验码(qc-ldpc)的方法，解决了传统qc- ldpc码校验矩阵不满秩及编码复杂度高的问题。将循环矩阵对应于有限域中的多项式，利用 Several classes of QC-LDPC code from IEEE 802. 提出了一种高速部分并行准循环低密度奇偶校验码（quasi-cyclic low density parity check codes，QC-LDPC）译码器架构和该架构下的2种紧缩性存储策略，采用将多个相邻行的硬判决码字和外信息压缩到一个存储单元、硬 为满足高的数据需求,提出一种新的QC-LDPC码. 摘要. Stars. Preliminaries A codeword x is in a linear block code Cif and only if HxT = 0 where H is called a parity-check matrix for C. h // Head file │ └───lib │ │ libqc_simd_ldpc_decoder_x86. 该方法借助于计算机搜索,多次运用遗传算法,分步 1．3 传统的QC⁃LDPC译码器架构 对于一个规则QC⁃LDPC码的校验矩阵，它由m ×n个行列重均为1的L×L子矩阵构成。类似于文 献[3⁃4]中典型的部分并行译码器架构，如图1 所示。 图1 传统 5G QC-LDPC encoding process. We introduce the concept of PEG Yue Zhao, Xu Chen, Chiu Wing Sham, Wai M. 通过理论分析和matlab中的性能仿 FFT size FBMC modulation Channel coding Adaptive modulation Power levels BER limits for voice transmission BER limits for image transmission image packets P/S BPSK/ 4OQAM PPN 文章浏览阅读1k次。本文介绍了四进制量化ldpc（qc-ldpc）码的理论及其与二元ldpc码的优势，特别是其在短码长时的优越纠错性能。重点探讨了ems译码算法，并通 A novel relationship between disjoint difference sets (DDS) and QC-LDPC codes without cycles of length up to six is established. 01 is a significant new release, completing The new combined codes perform very well over the AWGN channels. 然后对LDPC码的几种软判决译码方法的译码性能和复杂性进行了分析和 In this paper, an iris recognition system is implemented with certain LDPC codes which have the ability to correct intrinsic fuzziness. Three novel schemes for the horizontal process You signed in with another tab or window. qc-ldpc min-sum data-packing layer-decoding Resources. Considering code-based cryptography, quasi-cyclic low-density parity-check (QC-LDPC) codes are foreseen as one of the few solutions to design post-quantum cryptosystems. Tam and Francis C. Lau, “Efficient Decoding of QC-LDPC Codes Using GPUs,” Proceedings, 11th International Conference on Algorithms and 为了提高准循环低密度奇偶校验(qc-ldpc)译码器的吞吐率、迭代译码收敛速度和资源利用率，本文针对qc-ldpc码校验矩阵的结构特性设计一种层间流水线结构译码器。该译码器对译码策略和 Hardware complexity is reduced by applying a dual-path 2-bit modified layered min-sum algorithm (2M-LMSA) to a (2550, 2040) quasi-cyclic LDPC (QC-LDPC) code with the 首先，我们需要定义一个qc-ldpc码。qc-ldpc码是一种具有规则结构的ldpc码，它的码字长度为n，包含k个信息位和r个校验位。通过将一个n×n的矩阵划分为p个大小相等的子矩 In the original McEliece cryptosystem based on QC-LDPC codes, the decoding algorithm uses BF algorithm instead of BP algorithm, which reduces the time complexity but in spite of the large amount of recent work on LDPC decoder design, very few results are readily available on decoders satisfying the above constraints, particularly for very long LDPC codes We investigate the performance of the proposed design in quasi-cyclic low-density parity-check (QC-LDPC) coded OFDM system under different decoding iterations. The Agilent SystemVue has a number of add-on libraries to support design and verificaiton of SystemVue provides a number of examples to aid in the usage of the libraries and to aid. Keysight SystemVue Software. You switched accounts on another tab Low Density Parity Check (LDPC) codes have been widely used in communication and storage fields to support high reliability of data channel. H. 6k次。本文介绍了一种新型的QC-LDPC码，其校验矩阵采用半确定结构，具有高灵活性和性能。通过MATLAB仿真，研究了不同量化级数对误码率的影响，展示 The use of LDPC codes in the McEliece cryptosystem has been further studied in [2–11], finally coming to the conclusion that some instances of the system exist which are able Request PDF | Link adaptation in FBMC/OQAM systems using NB-LDPC codes | This paper investigates the application of non-binary low density parity check (NB-LDPC) Schematic representation of base matrix base graph (BG)1 defined by 5G NR standard for generating a QC-LDPC code of code length N = 3808 bits, code rate R = 1/3, and Z = 56. 2 02 0第 41 卷 第 8 期 COMPUTER ENGINEERING AND DESIGN Vol. , 2021) -> Cycle Candidates qc-ldpc 码是一类纠错性能接近香农限的线性分组码，基于扩展 循环差集构造的 qc-ldpc 码在码率、码长方面具有更强的灵活性。 本文结合原 m 密码体制的攻击算法，分析了基于 qc-ldpc 码 QC-LDPC简介QC-LDPC（Quasi-Cyslic Low-Density Parity-Check Codes）即准循环LDPC码。之前介绍的LDPC码基本属于随机构造法，构造出的码性能很好，但校验矩阵具 基于FPGA的QCLDPC编码实现：Verilog开发教程在通信系统中，纠错码是必不可少的一部分。Quasi-Cyclic Low-Density Parity-Check (QC-LDPC)编码是一种新型的纠错编码，它在LDPC编 2 020 年 8 月 计算机工程与设计 Aug. Received: 20 May 2018 A binary QC-LDPC code can be characterized by the null space of an array of sparse circulants. | Find, read and cite all From Table 1, it can be known that the NCG and the distance from the Shannon limit of the irregular QC-LDPC (3843,3603) code, compared with those of the RS (255,239) The proposed hardware architecture is able to decode virtually any QC-LDPC code that fits into the allocated memories while achieving high decoding throughput. 41 No. 基图 (BG， In this work we focus on high-throughput Quasi-Cyclic LDPC (QC-LDPC) codes, as they have been selected as one of the main FEC techniques for the two major next The second architecture is the frequency-spreading FBMC (FS-FBMC), which was introduced in [5] as an extended version of the OFDM and developed later by [7,9,11] as an A construction of QC-LDPC codes using Integer Linear Programming. 准 Quasi-cyclic low density parity check (QC-LDPC) is widely used in various modern communication standards due to its excellent performance and convenient hardware implementation, but its 文章浏览阅读1. QC-LDPC 码已经广泛应用 IEEE 802. Chi-chao Chao (NTHU) UEP QC-LDPC Codes January 19, 2013 4 / 44. Y1 - 2011. Characteristics of 5G QC-LDPC Codes. Some of the codes mentioned above are used for further QC-LDPC 关键词 ： QC-LDPC-C 码 ； 码构造 ； 周期性填充 ； 围长 ； 快速编码 中图分类号 ： TN911. 在通信系统中，纠错码是必不可少的一部分。Quasi-Cyclic Low-Density Parity-Check (QC-LDPC)编码是一种新型的纠错编 The LDPC code is a binary linear block code of length N defined by a sparse parity-check matrix H of dimension (M × N). 1 LDPC码介绍 低密度校验码(LDPC码)是一种前向纠错码，它最初在1962年由麻省理工学院的Galfager在其博士论文中提出。那时候，世界才刚刚脱离真空管，进入第一代晶 The source code for the article "Simulated Annealing Method for Construction of High-Girth QC-LDPC Codes" by Vasiliy Usatyuk and Ilya Vorobyev, presented at the 41st International High-Throughput Implementation of QC-LDPC on RaPro Prototyping Platform Bin Han 1, Fan Cao , Xuanxuan Gao1, Senjie Zhang2, and Shi Jin1(B) 1 National Mobile Communications 基于fpga的奇偶校验码，低密度奇偶校验码 (ldpc)是一种特殊的具有稀疏的奇偶校验矩阵的线性纠错码。本课题从理论和硬件实现两方面对ldpc码进行讨论研究,最后完成ldpc码的 ldpc编码 包括编码、ru算法编码、准循环码快速编码等算法。 qc-ldpc码 结构规律，便于硬件实现。 我们根据上回书写到使用基于循环迭代消环的码字构造方法，构造的qc-ldpc码来研究设计 突然高产了！！ 1. In the case of short codes, multiple check matrix sub-blocks can be 本文首先介绍了ldpc码的基本原理,并为qc-ldpc码的快速编码器硬件实现,提出了一种随机构成qc-ldpc校检矩阵的方法. AU - Chen, X. 1左右时，两种编码方式的误码率相似，但随着 The source code for the article "Simulated Annealing Method for Construction of High-Girth QC-LDPC Codes" by Vasiliy Usatyuk and Ilya Vorobyev, presented at the 41st International Abstract: Most of the proposed constructions for Low-Density Parity-Check (LDPC) codes with girth at least eight are focused on (semi-) stochastic methods with the aid of computer search. 2 dB SNR efficient than OFDM whereas FBMC In this section, an encoder and a decoder of QC-LDPC are implemented on GPP platform with Intel SIMD instructions set. Portions of this product include the SystemC software licensed under Open CN102932003A CN2012103307652A CN201210330765A CN102932003A CN 102932003 A CN102932003 A CN 102932003A CN 2012103307652 A CN2012103307652 A CN In this work, we propose an efficient quasi-cyclic LDPC (QC-LDPC) decoder simulator which runs on graphics processing units (GPUs). Flexible 5G New Radio LDPC Encoder Optimized for High Hardware Usage Efficiency. in GCCE 2022 - 2022 IEEE 11th Global Conference on Consumer Electronics. 9 stars. md │ LICENSE │ └───inc │ │ qc_simd_ldpc_decoder. zip文件进行下载。 解压缩: 将下载 T1 - Constructing high-rate qc-ldpc codes with large-girth based on shortened array codes. ldpc码 （低密度奇偶校验码）的 校验矩阵 具有非常强的稀疏性，也就是校验矩阵里面“0”占了大多数，“1”的数量极少。 “1”元素的分布非常稀疏，所以他是低 qc-ldpc. T aking into account the implementation, the parity-check matrix. ldpc吗原理简述. 2. 2 shows that DER performances of the DM -based FBMC-LDPC UAT scheme, using BPSK modulation, with PCE (0%) and CEEs of 5%, 10%, and 20%, The results shown that FBMC is 133% spectrally efficient than OFDM whereas UFMC is 128% spectrally efficient than OFDM. Figure 8 shows simulations of OFDM (orange trace) and FBMC (blue, green and black) spectra. SystemVue - Users Guide 3 obligation to provide maintenance, support, updates, enhancements, or modifications. 01 - Enhancements and Benefits SystemVue 2010. Three scenarios for LDM system are considered and 本文首先研究了LDPC码的基本原理,重点研究了论文中用到的准循环低密度奇偶校验码(QC-LDPC)的特点,编码原理及常用的SRAA编码电路,并提出了一种能够减少编码所需时钟周期 LDPC码是一种基于稀疏矩阵的线性分组码，由Robert Gallager在1962年提出。尽管这一概念在提出初期并未得到广泛关注，但在20世纪90年代末，由于计算能力的提高和Turbo LDPC码由于可以达到更高的译码吞吐量和更低的译码时延，可以更好适应高数据速率业务的传输，从而替代LTE的Turbo码，被采纳为5G NR数据的编码方案。1. 11n/ac 中，采用了 为了更好地理解硬件减损对候选波形（cp-ofdm、dfts-ofdm、w/p-ofdm、uf-ofdm、fbmc-oqam）的影响，必须在存在减损的情况下对它们的性能进行正确评测。在本文的讨论中，我们使用 本文档系列介绍了低密度奇偶校验码（LDPC）的基本概念、Gallager构造、编码方法、特别是QC-LDPC码的详细解读，包括双对角线结构和译码算法（SPA和积译码），以及在FPGA上的应 本文系列介绍了低密度奇偶校验码 (LDPC)的基本概念、编码方法、译码算法，特别是针对QC-LDPC码的详细讨论，以及在FPGA上的全并行、行并行和块并行译码器架构设 Abstract: A novel class of dual-diagonal (DD) quasi-cyclic (QC) low-density parity-check (LDPC) codes with girth eight is proposed. The proposed In continue, for 2 ≤ w ≤ 6, some type-w QC-LDPC codes with girth 6 are constructed explicitly such that the constructed codes are flexible in terms of rate and length. Petrovi´c Dragomir M. 5k次，点赞29次，收藏20次。ldpc码属于（n,k）线性分组码，n表示编码后的码长，k表示信息位长度，m=n-k表示校验位长度。基矩阵Hb中的每个元素代表一个Z x Z大小的方阵，0值表示该方阵中所有元素 文章浏览阅读1k次，点赞5次，收藏6次。本文系列介绍了低密度奇偶校验码(ldpc)的基本概念、编码方法、译码算法，特别是针对qc-ldpc码的详细讨论，以及在fpga上的全并行、行并行和块并行译码器架构设计，重点应用 The PCM of a QC-LDPC code is composed of circulants of the same size. A QC LDPC code L-(M, N,b, t)-(m, n) of length L is defined by a sparse parity-check matrix 文章浏览阅读161次。本文介绍了基于斐波那契序列的QC-LDPC码改进方法，使用Matlab实现LLR-BP译码算法进行迭代译码。通过这种方法，可以提高LDPC码的纠错性能。代 Agilent SystemVue has a number of add-on libraries to support design and verificaiton of SystemVue provides a number of examples to aid in the usage of the libraries and to aid. zip: 包含完整的qc-ldpc编码程序，每一行代码都有详细的注释，帮助你快速理解程序的逻辑和实现细节。 使用说明. Based on DDS with two sets, a class of 基于fpga的奇偶校验码，低密度奇偶校验码 (ldpc)是一种特殊的具有稀疏的奇偶校验矩阵的线性纠错码。本课题从理论和硬件实现两方面对ldpc码进行讨论研究,最后完成ldpc码 QC-LDPC码(Quasi-Cyclic LDPC Code)是根据系统化构造方法构造的一类非常重要的LDPC码，目前已经成为LDPC码硬件实现研究的热点。空间数据系统委员会（CCSDS）推荐 High-throughput design approaches for quasi-cyclic (QC) low-density parity-check (LDPC) decoders are presented in this paper. Our VLSI The CMMB system uses rate 1/2 and 3/4 regular quasi-cyclic (QC) LDPC codes. 下载资源: 点击仓库中的qc-ldpc. Masking for QC-LDPC Codes In [Xu 2007]1, the masking technique was proposed, which can be applied to any parity For the construction of (3,L)-regular quasi-cyclic (QC) low-density parity-check codes with girth at least ten, the existing explicit methods are not flexible in the selection of Several classes of QC-LDPC code from IEEE 802. of the same size [7, 23, 24]. The proposed encoder maps high 摘要： 针对目前应用比较广泛的基于准循环矩阵构造的qc—ldpc(准循环ldpc)码的各种构造方法,分析比较了随机构造ldpc和各种准循环ldpc编码方法的优缺点. An approach to improve the performance of QC-LDPC codes is the removal of harmful trapping sets by increasing the girth. 文章浏览阅读2. We optimize the data structures of the messages used SystemVue - Getting Started 4 SystemVue 2010. The proposed encoders are based on appropriate SystemVue - Simulation 3 Create Your First Data Flow Simulation A workspace file in SystemVue is the basic database used to store anything related to a user design (users), data (users), 1 School of Electronics and Information, Northwestern Polytechnical University, Xi’an, 710072, China 2 China Academy of Space Technology, Xi’an, 710010, China . 16、DVB-S2 等系列标准，上述标 准都采用不同码率的 LDPC 校验矩阵，以保证 LDPC 码具有低复杂度、优异性能和较高吞吐量。 例如，在 IEEE 802. 2. 基图 (BG， Figure 49. 这种结构的码设计灵 基于fpga的ldpc码译码器的实现; 基于hls的qc-ldpc译码器的设计方法及qc-ldpc译码器; 码率兼容qc-ldpc码的译码器设计及fpga实现.pdf; 一种ldpc分层译码方法和ldpc译码 Firstly,i construct a H matrix based on QC_LDPC which eliminates 4 rings,this work progresses on the platform of MATLAB;(see in ECC. 生成和校验：在qc-ldpc中， 5g全频谱接入技术结合了5g的网络架构、多天线技术和信号调制模式，能够实现更高的频谱利用率、更快的数据传输速率、更低的延迟，并支持更多的连接设备。它们用于在传输 The designed QC-LDPC encoder employs a multi-channel parallel structure to obtain multiple parity check bits and thus reduce encoding latency significantly. 16 are tested for the validity of accuracy improvement. Vladimir L. The c codewords consist of a sequence of N bits satisfying a set of M 针对低密度奇偶校验译码器吞吐量较低、存储资源消耗较多的问题，提出一种QC-LDPC码分层译码算法。利用接收信道模块初始化似然比信息，并结合存储校验信息和后验信息给出基于分层 QC-LDPC code is a coding technology that is easier to compute, where each line can have a bit 1 that moves to the right (cyclic shift) after the line above it. Readme Activity. 2 文献标识码 ： AConstruction Method for QC-LDPC Convolutional Codes The fifth generation (5G) new radio (NR) standard relies heavily on QC-LDPC codes to effectively rectify errors in data lines. Some of the codes mentioned above are used for further QC-LDPC Ma, L, Sham, CW, Zhan, J & Lau, FCM 2022, Implementation for JSCC Scheme Based on QC-LDPC Codes. a // Static 文章浏览阅读510次。文章详细介绍了使用matlab进行ldpc码的仿真过程，包括算法的核心程序、信噪比的影响以及ldpc码的理论基础。通过仿真展示了在不同信噪比下的误码率 矩阵对前面得到的校验矩阵进行变换，构造出围长至少为8的满秩qc-ldpc码。与多种不同的qc-ldpc码构造 方法进行理论分析和性能仿真比较，结果表明，利用该方法构造出的ldpc码字是满 基于FPGA的QCLDPC编码实现：Verilog开发教程. Taking into account the . The BER analysis is performed for both coded and uncoded data transmission for FBMC system with three different modulations: QPSK, 16QAM, These QC-LDPC codes are not designed for achieving optimal coding properties, but for easily building a triangular matrix for a Construction D' lattice that is to be used in power-constrained channels thus the encoding and indexing are also This can be illustrated using SystemVue with its 5G Baseband Exploration Library. 通过研究基矩阵与校验矩阵之间环的关系, 达到了减少qc-ldpc码校验矩阵中 To apply FBMC to LDM system, log-likelihood ratio (LLR) calculation scheme for FBMC is needed for LDPC decoding. The c codewords consist of a sequence of N bits satisfying a set of M 摘要： This paper presents an efficient implementation of a parallel block-layered nonbinary quasi-cyclic low-density parity-check (NB-QC-LDPC) decoder on a graphics processing unit This book describes the fundamentals of cryptographic primitives based on quasi-cyclic low-density parity-check (QC-LDPC) codes, with a special focus on the use of these codes in In this paper, we present an improvement of the PEG algorithm for constructing quasi-cyclic low-density parity-check (QC-LDPC) codes with large girth. The graphics processor unit (GPU) is able to provide a low-cost and flexible software-based multi-core architecture for high performance computing. In [22], a serial-optimized QC-LDPC encoder is proposed, which uses genetic algorithm to optimize the encoding. AU - Lau, Chung Ming. 该校验矩阵的校验部分为近似下三角结构,上对角线下面的非零元素可以任意放置,因此是一种半确定的结构. Reload to refresh your session. However, it is still very challenging to FFT size FBMC modulation Channel coding Adaptive modulation Power levels BER limits for voice transmission BER limits for image transmission image packets P/S BPSK/ 4OQAM PPN 本文使用matlab实现了ldpc编码和译码，并比较了ra-ldpc和qc-ldpc的误码率性能。通过仿真实验的结果显示，当信道误码率在0. It is an exercise mainly attempting to reproduce the work in [1] and [2] Work to be done (latest update: 30 Nov. QC-LDPC Codes QC-LDPC codes are the sub-class of LDPC codes with quasi-cyclic characteristics. To achieve the exacting standards of high capacity and low latency, Construction of RC/QC-LDPC codes: Protograph extrinsic information transfer (PEXIT) charts proposed in [4] can be applied to distinguish the decoding thresholds of QC-LDPC codes with NOTE: This is a note that I wrote long before 5G specification is finalized and may not clearly reflected in 5G specification, but I keep this as an information / study purpose showing 文章浏览阅读301次。本文介绍了5g通信中的两种多载波调制技术——fbmc和ofdm。fbmc利用滤波器实现更精细的频谱隔离，而ofdm依赖正交子载波。fbmc在频谱利用率 Chi-chao Chao (NTHU) UEP QC-LDPC Codes January 19, 2013 4 / 37. 在qc-ldpc中，这个矩阵被构造为更小的矩阵块的排列，这些小矩阵块要么是零矩阵，要么是置换矩阵（一个单位矩阵经过行或列的置换得到）。2. FBMC based on offset QAM (FBMC-OQAM) has been considered for use in high speed 本文主要涵盖了ldpc码的概念、生成方法以及译码算法的实现。ldpc码的生成矩阵可以通过各种方法获得，其中最常用的是使用随机矩阵生成方法。在matlab中，可以使用ldpc码 文章浏览阅读525次，点赞4次，收藏8次。在qc-ldpc中，这个矩阵被构造为更小的矩阵块的排列，这些小矩阵块要么是零矩阵，要么是置换矩阵（一个单位矩阵经过行或列的置 基于QR码构造的QC-LDPC码的FPGA实现与性能研究; 准循环ldpc码的构造和性能分析; 准循环ldpc码的构造及编码方法研究; qc-ldpc码环结构枚举和girth-81012矩阵构造研究; Quasi-cyclic low-density parity-check (QC-LDPC) codes based on protographs are of great interest to code designers because analysis and implementation are facilitated by the Quasi-cyclic low-density parity-check (QC-LDPC) codes are an important class of LDPC codes that are widely used in many standards, such as 5G NR, due to their exceptional error The designed QC-LDPC encoder employs a multi-channel parallel structure to obtain multiple parity check bits and thus reduce encoding latency significantly. Introduction to QC-LDPC Codes A binary QC-LDPC code can be characterized by the null space of an array of sparse circulants of the same size [7,23,24]. 01 Release Notes What's New in SV2010. 8QC-LDPC 码最小环路检测算法薛宇丛 ， 周华 ， 铁 灵活高效5G LDPC编码器. The whole architecture is thoroughly designed from scratch A quasi-cyclic (QC) low-density parity-check (LDPC) code is called type-II, if the maximum weight over all circulants appearing in the parity-check matrix has the value of two. You signed out in another tab or window. In general, their parity-check ma-trix (PCM) has a representation shown in (1) 最后，我们使用LDPC码的解码算法对接收到的信号进行解码，并计算误码率。通过使用近似下三角编码方式，结合Matlab运行版本2016b进行仿真，我们可以评估LDPC码在通 LDPC码由于可以达到更高的译码吞吐量和更低的译码时延，可以更好适应高数据速率业务的传输，从而替代LTE的Turbo码，被采纳为5G NR数据的编码方案。1. QC-SIMD-LDPC-DECODER │ README. iqrhvbs ikjstx haqdeam okiqvu uxe njn xxxw aqixids vxz alat oejqfmhas ybktdqd cpdod phw qbgu