通信系统

Some common used channel codes are introduced, and emphasis is placed on linear block codes, cyclic codes, BCH codes, RS codes, convolutional codes and the promising turbo codes, which is planned to be implemented in the third locomotive communication systems. Their performance is analysed and compared. And some method to reduce errancy is submitted, also the interleaved technique is introduced.

文章介绍了几种常用的信道编译码方案，如线性分组码，循环码，BCH码，RS码，卷积码等，分析和比较了它们的性能，并对第三代移动通信系统的选用码Turbo码作了简要介绍，对提高纠错性能提出了若干改进方案，同时介绍了交织技术减少差错的作用。

In order to solve the reliability, the communications system has all used the error control.

为了解决可靠性，通信系统都采用了差错控制。

Radio channel modeling and parameter estimating is important to design and research of the mobile communication system.

无线信道的参数估计和信道建模对数字移动无线通信系统的研发具有重要意义。

USSD(unstructured supplementary service data) is a new data service defined by ETSI for use within the GSM.

非结构化补充业务数据是ETSI定义的一种基于全球移动通信系统网络的新型交互式数据业务。

The Boeing Company announced on October 13 that it has delivered the 20,000 Combat Survivor Evader Location communications system to the joint services.

10月13日波音公司宣布已经向联合军种交付了2万台"作战幸存者/逃逸者定位器"通信系统。

By the time he was12 he was a telegrapher and everlastingly trying to make that system of communication work better.

到他12岁时，他当上了报务员，他坚持不懈地努力尝试改进这种通信系统。

Data traffic system of ARINC429 bus is composed of data send/receive module, expand memory module, supervise module and so on. The system is designed as two grades: lower and upper PC.

基于80C196的Arinc429总线数据通信系统由总线发送/接收、扩展存储、监控等模块组成。

With the development of oceanic exploiture and communication industry, the need to high rate underwater acoustic communication is more and more urgent.

随着海洋开发和信息产业的发展，高速水声通信系统的需求日益扩大。

The conclusion is obtained as that the type of exponential is of the most practical value for soliton communications system.

在孤子通信系统中，指数型色散缓变光纤最具实际应用价值。

It contains: a continuous guide frequency generating module to generate DPCCH non-guide frequency emission estimation value according to input DPCCH de-spread signal and guide frequency emission signal, and combine the estimation value with the DPCCH guide frequency emission signal to generate continuous guide frequency; an average fading factor generating module to generate average fading factor of each DPCCH code according to the input continuous guide frequency and DPCCH de-spread signal; a demodulation signal generating module to generate DPCCH and DPDCH demodulation signals according to the input average fading factors and DPDCH and DPCCH de-expanding signals at the corresponding time.

这种码分多址通信系统的信号解调装置包含：连续导频产生模块，用于根据输入的DPCCH解扩信号以及导频发射信号，产生DPCCH非导频段发射估计值，并将所述DPCCH非导频段发射估计值与所述DPCCH导频发射信号合并，产生连续导频；平均衰落因子产生模块，用于通过输入的所述连续导频以及DPCCH解扩信号，产生DPCCH各个码元的平均衰落因子；解调信号产生模块，用于通过输入的所述DPCCH各个码元的平均衰落因子，以及对应时刻的DPDCH解扩信号和DPCCH解扩信号，产生DPCCH和DPDCH解调信号。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。