The encoding and decoding algorithm of LDPC Codes.
LDPC码的编码和译码算法。
Finally, the optimization of the LDPC codes in the DSTC systems is discussed.
最后，论文探讨了LDPC码在分布式合作通信系统中的优化问题。
This paper proposes a joint source-channel decoding based on the VLC and LDPC codes.
提出了一种基于VLC和LDPC的联合信源信道译码算法。
LDPC codes have good error-correcting performances as well as good error-detecting performances.
纠错性能良好的LDPC码同时具有良好的检错性能。
This paper considers the issue of finding good puncturing patterns for rate-compatible LDPC codes.
该文研究码率兼容ldpc码的打孔问题。
Low encoding complexity can also be achieved due to the inherent quasi-cyclic structure of the LDPC codes.
由于产生的LDPC码本身固有的准循环结构，还能得到较低的编码复杂度。
There are two types of LDPC codes decoding algorithms: hard decision algorithms and soft decision algorithms.
LDPC码的译码算法主要分为两类：硬判决算法和软判决算法。
A design of parity check matrix for Irregular LDPC codes based on per mutation matrix is proposed in this paper.
提出了一种基于置换矩阵的非规则低密度奇偶校验(LDPC)码的校验矩阵设计方法。
Based on the structure of quasi-cyclic LDPC codes, a synchro partially parallel decoder is proposed in this paper.
该文根据准循环ldpc码的结构特点，提出了一种同步部分并行结构的译码器。
QC-LDPC codes constructed by circulant permutation matrices will lead to inevitable cycles, named balanced-cycles.
在用循环置换矩阵构造准循环LDPC码时会出现一类无法消除的环，称为平衡环。
For the time being, there is little research of applying LDPC codes to the atmospheric wireless optical communication.
目前对无线光通信系统在大气信道中应用LDPC码的研究少见于文献。
For short and middle length LDPC codes, the oscillation of LLR owing to cycles degrades the performance of BP algorithm.
中短长度LDPC码在采用BP算法译码时，由于短环的存在会导致某些比特llr值出现振荡现象，从而影响了译码性能。
After describing elements of LDPC codes, LDPC coded WCDMA downlinks were constructed, meanwhile, decoding process was improved.
在讨论了ldpc码的基本原理之后，构建了基于ldpc码的WCDMA下行链路，改进了ldpc码的译码过程。
By the computation redundancy in conventional serial decoding algorithm, a modified serial decoding algorithm for LDPC codes is proposed.
针对传统LDPC串行译码算法计算存在冗余的问题，提出了一种改进的LDPC串行译码算法。
The encoding complexity of LDPC codes length n seems indeed to be of order n2, the dissertation study the coding scheme with linear time complexity.
针对LDPC码通用编码算法的复杂度与码长的平方成正比的问题，重点研究了LDPC码的快速编码方法，总结出了使LDPC码能够达到线性编码的途径。
Combining the existing theoretic and practical fruits, researchers focus on the designing of powerful LDPC codes with low coding and decoding complexity.
结合现有的理论成果和实践经验，设计性能优良且编译码复杂度低的LDPC码是近年来人们研究的热点问题。
This paper mainly expound the encoding and decoding principle of Q - ary LDPC codes, and introduce a Fourier transform decoding method with low complexity.
本文主要阐述了多进制ldpc码的编译码原理，并介绍了一种可简化译码的傅立叶变换译码算法。
A novel and simple construction of regular LDPC codes was proposed, which used sparse binary sequences, through studying construction methods of LDPC codes.
通过对低密度奇偶校验(LDPC)码构造的研究，提出了一种利用稀疏二进制序列构造规则LDPC码的新颖而简单的方法。
Research of the fixed point which appears in decoding process of LDPC codes is important to further analyze the decoding mechanism and speed up decoding convergence.
LDPC码译码误比特率与迭代次数关系曲线及其粘滞点的研究，对于进一步深入分析译码机理和加快译码收敛的速度有着重要的意义。
Moreover, this decoder is also compatible with various block-lengths and code-rates, so only one decoder is needed for different LDPC codes with the same column weight.
该译码器可兼容多种码长、多种码率的LDPC码，因此只需要设计一个译码器，就可以完成对具有相同列重的不同LDPC码的译码。
RA codes, IRA codes, ARA codes and its nested codes, which are the subclasses of LDPC codes, their protographs, encoding structures and threshold characteristics are given.
研究LDPC码的原模图设计及构造方法，给出LDPC码的子类：RA码、IRA码、ARA码及其嵌套码的原模图表示、编码结构及阈值特性。
However, the study of non-binary LDPC codes is less, the theory is not perfect, and the high complexity of its decoding algorithm seriously affecting its massive popularity.
但目前非二进制ldpc码的研究较少，理论不够完善，且其译码算法的复杂度较高，严重影响了它的大规模普及。
Finally, a multilevel coding (MLC) scheme with ARAPA protograph LDPC codes as component codes is designed. This scheme takes both bandwidth and power efficiency into account.
最后，论文以ARAPA原模图ldpc码为分量码，结合多级编码调制(MLC)技术，设计了一种兼顾带宽和功率效率的编码调制系统。
This paper analyzes the structure of balanced-cycles in QC-LDPC codes. And proposes an algorithm to search for the incidence matrices of the simple balanced-cycles of arbitrary length.
分析了准循环ldpc码的平衡环的结构，并给出了搜索任意长度的最简平衡环的关联矩阵的方法。
This paper briefly introduces the basic concepts of LDPC codes , a nd then discusses the applications of LDPC codes for compressed image transmission and for magnetic recording channels.
简要地介绍了LDPC码的基本概念，重点讨论了LDPC码在压缩图像传输和磁记录信道中的应用。
This scheme considers the decoding property of irregular LDPC codes and decides whether iterative decoding continues based on the log-likelihood ratio value of lowest degree variable nodes.
该方案考虑到非规则LDPC码的译码特点，通过度数最低的变量节点的似然信息来判定迭代译码是否继续。
The recently proposed extrinsic information transfer(EXIT) chart is a powerful yet simple method for optimizing irregular low-density parity-check (LDPC) codes.
最近提出的外部信息转移图是一种优化非正则LDPC码的简单高效方法。
Abstract : The structured low density parity check (LDPC) codes can be described by the base-matrices and lifting factors, which have low encoding/decoding complexity and good coding performance.
摘要结构化低密度奇偶校验码可通过基矩阵和扩展因子描述，具有较低的编译码复杂度和优异的译码性能。
Low Density parity check (LDPC) codes are a kind of linear block codes approaching Shannon limit. They can be constructed either with spare parity-check matrix or with factor graphs.
LDPC码是一种可以接近香农限的线性分组码，可通过稀疏奇偶校验矩阵来构造，也可以用因子图来构成。
Low Density parity check (LDPC) codes are a kind of linear block codes approaching Shannon limit. They can be constructed either with spare parity-check matrix or with factor graphs.
LDPC码是一种可以接近香农限的线性分组码，可通过稀疏奇偶校验矩阵来构造，也可以用因子图来构成。
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