查询词典 codes

A survey of duadic codes is presented firstly, necessary and sufficient conditions for the existence of nontrivial duadic abelian codes over Z_4 are presented secondly.

文中首先综述duadic码；其次给出了Z4上存在非平凡duadic阿贝尔码的充分必要条件；最后给出了Z4上劈分为μ-1的非平凡duadic阿贝尔码存在的充分必要条件，这些条件也是存在Z4上非平凡自偶阿贝尔码的充分必要条件。

Recently, duadic codes over Z_4 are presented by Langevin and Sole(2000), but the existent problem of duadic abelian codes over Z_4 hasnt been solved yet.

Langevin和Sole(2000)首次提出环上duadic阿贝尔码的定义，对于环上duadic阿贝尔码存在性问题仍未被解决。

Based on the signal and the system, the principle of operation for the Turbo codes is considered, and some noted problems are discussed in the design of the interleaver for Turbo codes.

从信号与系统角度研究了Turbo码编码器的工作原理，并在这一基础上指出了Turbo码交织器设计过程中应注意的一些问题。

The line is designed to handle different size and shape of coils and palletize the coils in different patterns in same line. The line itself can make and choice packing material required automatically from different pre programmed packing codes (all codes can easily be created or modified by operator).

这条包装线设计应用于对不同直径和不同宽度的铜带按不同摆放模式加托盘包装，它能够按照预设的包装代码自动选择相应的包装材料（所有包装代码都可由操作工方便地新设或修改）。

Each relevant experiment proved the table of genetic codes has its own permutable pattern from chemical reactants to products , instead of the descriptions in the table of genetic codes .

&密码子的氨基酸意义&破译实验中，将反应物多个不同类核苷酸分子共聚体的空间几何形象描述为密码表中三个字母的直线上单向排列，造成用一维空间刚量描述r维空间向量的数学描述错误。

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。

Secret Codes is a simple program which is able to store all your secret codes in the phone memory cyphering with one password.

Secret Codes是一个简单的应用程序，用它可以把你所有的密码存至你的手机存储里，然后将其统设为一个密码进行封存。

Through comparing with the results by simulation to study the effects of theprojectile"s final velocity, the angle of rotation and the ballistic trajectory"s migration withdifferent projectile"s rotating speeds, different target"s moving speeds and differentpenetration angles.

通过比较数值模拟的结果来研究不同弹头转速、目标速度、侵彻角对侵彻过程中弹头最终速度、翻转角度和弹道偏移的影响。

I love stationery and all the accoutrement of writing.

我爱文具以及所有的书写的工具装备。