Both quantum error correcting code and quantum error avoiding code are practical quantum channel coding schemes . we present in this dissertation a new quantum error correcting code scheme , named serially concatenated quantum convolutional code 克服量子信道噪声的编码就称为量子信道编码，实用的量子信道编码包括量子纠错码和量子避错码。
The iess 309 standard indicates two decoding methods , we focus on the systemic convolutional code with long encoding restriction which is 36 bit and adopt the fano sequential decoding algorithm to implement the decoder 在协议中规定了两种译码的方式,我们主要是针对编码约束度为36的系统卷积码,采用fano序列译码算法来实现其译码,并进行了仿真。
With the developments of the concatenated codes and turbo codes reviewed , the serially concatenated convolutional codes that are the serial counterpart of the turbo codes are introduced firstly in this paper 本文在对级联码发展历史和turbo码简要介绍的基础上，着重研究了串行级联卷积码( sccc )和串行级联网格编码调制( sctcm )的编译码方法、纠错性能和设计原则。
( 2 , 1 , 7 ) nonsystematic convolutional codes are optimal convolutional codes on the same code length and information bit length condition , so they are adopted as space standard codes by ccsds ( consultative committee for space data systems ) ( 2 ， 1 ， 7 )非系统卷积码在相同的码长和信息长度下为最佳卷积码，因此被ccsds (空间数据系统咨询委员会)采纳为空间标准码。
Convolutinal coding is a coding scheme often employed in digital wireless communications . viterbi decoders are used to decode convolutional codes . viterbi decoders employed in digital wireless communications are complex and dissipate large power 卷积码是一类重要的前向纠错编码,它编码简单,易于实现最佳译码,是当今无线数字通信系统的一个十分重要的组成部分。
In the first part of this thesis , the iterative process structure which is based on the extrinsic information exchange between the siso ( soft in soft out ) component decoders of pccc ( parallel concatenated convolutional codes ) is discussed 首先以并行级联卷积码( pccc )为对象详细的讨论了分量码的软输入软输出( siso )算法和在此基础上基于外信息交换的迭代解码算法。
The circuit to fulfill the byte processing function includes all parts between the modules on convolutional decoding and transfer stream de - multiplexing , consisting of the modules on data de - interleaving , rs decoding , data de - scrambling and format transforming 完成字节处理功能的电路包括从卷积解码输出后到传输流解复用的所有部分，由解交织、 rs解码、解扰码和格式转换等模块组成。
In order to implement the iess 309 standard and sequential decoding for the convolutional codes in satellite digital receiver , we have made a deep research in sequential decoding algorithm and solved some problems on implementing the sequential decoder for convolutional codes 为了实现iess309协议标准,在卫星数字接收机中实现卷积码的序列译码,我们深入的研究了序列译码算法,解决了序列译码器实现的过程中存在的一些问题。
We first design the construction modules of serially concatenated quantum convolutional code . and then design the corresponding code - coding gate - array . in quantum error avoiding code , we first unified the definitions of decoherence - free subspace , and then proved that all these definitions are equivalent 在量子避错码方面，统一了各种无消相干子空间的定义，证明了各种定义之间的等价性，同时提出一种利用群论方法构造无消相干子空间的简单方案。
In chapter 1 , a survey of ccc and stc , including their development is presented . in chapter 2 , encoder structure , decoder structure and interleaver of parallel concatenated convolutional code ( pccc ) and serially concatenated convolutional code ( sccc ) are studied . symbol - wise siso algorithm and bit - wise siso algorithm are given 在第二章中，系统分析了并行级联卷积编码和串行级联卷积编码的编码结构、交织器的类型、译码结构以及基于符号和基于比特的siso算法。
