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。
The equations for updating messages of different decoding algorithms of LDPC codes are induced.
推导了不同测度下LDPC码各种译码算法的消息迭代更新公式。
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。
This paper mainly discusses the design of a family of irregular LDPC codes with low encoding complexity.
文章主要讨论一类低编码复杂度的非规则ld P C码设计问题。
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。
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。
This paper constructs irregular LDPC codes of unequal error protection with a parity check matrix in a lower triangular.
采用了近似下三角校验阵的形式，构造了一类具有不等错误保护的非规则ldpc码。
This paper firstly overviews the efficient encoding of LDPC codes, based on which we proposes a linear encoding for UEP.
首先回顾了LDPC码的有效编码，然后在此基础上提出了一种应用于不等错误保护的线性复杂度编码方法。
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。
The utility of LDPC codes in the system is analyzed and described in detail, some criterion of the utility are presented.
通过分析说明低密度校验（LDPC）码在流星余迹通信系统中的应用，提出了LDPC码应用的几个原则。
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。
In this paper, the optimization method of degree distributions for irregular LDPC codes is presented, which is based on differential evolution.
讨论了基于差分进化的非规则ld P C码分布对优化方法。
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。
Finally a conclusion is made that projective geometry LDPC codes may be adopted as one of the key technologies in the next wireless communication systems.
最后得出结论，投影几何ld P C码将有可能作为下一代无线通信系统的一项关键技术被广泛采用。
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。
Finally we investigate different construnction parameters which influence the performance of the non-multi-edge LDPC codes and a simulation is given to validate.
最后我们还根据非多重边LDPC码性能曲线，分析其特点以及影响译码性能的参数，并通过仿真进行验证。
Quantization decoding of QC-LDPC codes is studied. We simulated the decoding performance which is affected by quantitative precision and the scope of quantization.
研究了QC-LDPC码的量化译码，针对高速率的光纤通信系统，仿真验证了量化范围和量化精度的对译码性能的影响。
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。
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。
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