查询词典 codes

The basic principles of linear programming algorithm for the maximum likelihood decoding of LDPC codes are analyzed, and the ways to construct the codeword polytope based on the factor graph expression of parity check matrix of LDPC codes are described.

分析了应用线性松弛方法对低密度奇偶校验码进行最大似然译码的基本原理，介绍了基于LDPC码校验矩阵因子图表达构造码字多胞形的方法。

this paper analyses the basic principle of tpc,compares the error performance in the system which has been applied with tpc with the uncoded system,studies the influences which different block codes and iterative numbers to tpc decode performance.under the circumstances of different iteration numbers and block codes,experiment simulation is carried on.the simulation results indicate that introduction of tpc can get the code gain of 5~6 db.tpc decoding algorithm is simple,and doesn′t have the error floor,the complexity of its hardware implementation is smaller,it is a kind of practical channel coding method.

摘 要：在分析turbo 乘积码的基本编译码原理的基础上，比较了未编码与编码后系统的差错性能，研究了选取不同分量码、不同迭代次数对tpc译码性能的影响。在不同迭代次数与分量码情况下，进行了仿真实验。仿真实验表明，在相同的差错性能条件下，采用tpc码能带来5~6 db的编码增益。tpc译码算法简单，没有错误平层，硬件实现复杂度较小，是一种非常实用的信道编码方式。

In this paper, a concatenated schemes using Turbo codes and an outer RS codes could perform better.

本文研究的Turbo码与外部RS码级联产生的新的纠错码可以有效的解决这个问题。

A new concatenated code structure is proposed which concatenates a space-time block codes with non binary low density parity check codes, which is high-level modulated without any parallel-to-serial conversion to lower the error and simplify the system structure.

提出了一种新的级联码结构，将基于有限扩域的非二进制LDPC码和空时码级联，这种结构使得非二进制LDPC码不需要串并变换直接进行高阶调制，简化了系统结构，克服了串并变换所带来的误差。

Among the existing LDPC codes, some codes have large girths but they have small minimum weights which lead to a poor BER performance.

论文摘要：由于短环和最小码重特性未得到重视时，可编码的不规则准循环LDPC码由规则准循环LDPC码导出可能导致其具有劣化的误码率性能。

In this paper, a low complexity and memory-efficient concatenated codes called Parallel Interleaved Concatenated Gallager Codes are presented.

本文提出了一种具有低复杂度和低存储需求的并行级联码—并行交织级联Gallager码。

Lastly, anti-jamming method based on jittering orthogonal codes at different moments is studied, orthogonal codes are searched with the genetic algorithm, and random initial phase is also used in this method, so great anti-jamming performance is gotten, and the performance is testified through the simulation.

提出了基于正交编码捷变的抗干扰方法，使用遗传算法搜索正交编码集，在不同的慢时刻使用相互正交的编码信号，并与随机初相方法相结合，有效地抑制了基于转发的有源干扰。

Besides the 30,000 frequently used phrases, there are 12 professional word-stocks are appended. The new function to construct phrases from taking the Characters from the screen and delete the phrases from the word-stock is convenient and agile. Also the Wangma Intellectual Pinyin Input Method is designed to the software. The unique Help and encoding prompt functions are added to the new software. The originated 'Retractile Antenna' Character sets switch method reduces identical codes greatly so as to improve the inputting speed greatly. The software adopts new simplified and traditional Character Roots list and originally creates the Three Grades to learn the Cross-codes that enables the beginners to learn the Method easily.

除系统自带的3万条常用词汇外，还特别设计了12种专业词库共10万条专业词汇，用户可以灵活选用；设计了屏幕取字造词功能，随造随用，灵活增删；增加了独特的&帮助&及编码提示功能；首创了&拉杆天线&式字集切换法，进一步减少了重码，使输入效率大为提高；推出了简繁兼备、配曲可唱的新字根表；安装了辅助的&王码智能拼音输入法&；独创了&识别码三段学习法&，为初学者由初级向高级过渡架设了阶梯。

In view of the status that a confused application of codes happened in the area of semeiology, and to differentiate the difference between periodical code and its language and photo codes, the author plans to use the concept of "sign and code" to describe specially the commercial code which circulates in the contemporary social culture and co-use with media symbol.

这充分体现出本文独特的文化观察视角。鉴于符号学中各符号概念之间的混用情况，并区分期刊符号与其使用的语言、图像等媒介符号之间的差别，笔者拟用符码概念，专门指称在当下社会文化背景中流通的，与媒介符号套合使用的产品符号。

It proceeds decoding by combining the least weight columns of check matrix of linear block codes. And it can also compute the soft output of decoded symbols, so an iterative decoder for product codes can constructed from it.

该算法通过组合线性分组码校验矩阵中权重较小的列向量进行译码并正确计算出各码字元素的软输出信息，应用该算法可以构造乘积码迭代译码器。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。