通信系统

So networks of special structure are introduced which can be rapidly deployed without relying on any preexisted fixed network infrastructure and can also be automatically configured as well as adapted themselves to the dynamic changing of node location.

因此需要一种特殊的通信系统，这种通信系统的运行不能基于任何预先架设好的网络设施，要能实现决速动态的自动组网，节点要能移动，具有很高的抗毁性能。

This peper outlines the requirements of the railway emergency telecommunication at war and gives information about the features of the new-generation RETS.

针对铁路应急通信的现状及存在问题，提出了战时铁路应急通信的要求，并介绍了新一代铁路应急通信系统设备的特点。

A method for the calculation of the ground potentials when the telecommunication equipment and other ground pipes buried metal pipes or metal sheathes of cables are influenced by the resistive coupling is suggested .

分析了层式土壤情况下强电系统与通信系统间的阻性耦合特性，给出了通信设备及其它地下金属管线或埋电缆的金属屏蔽体遭受阻性耦合影响时的地电位计算公式。

So the research on antennas in mobile communication system is an important issue with great theory and engineering meaning.

随着移动通信技术的飞速发展，系统越来越复杂，对天线性能的要求越来越高，因此对移动通信系统中天线的研究是一个有重大理论意义和工程意义的课题。

Similar to other kind of communication systems, the radio frequency modular of RSU in DSRC include many parts such ad antenna, duplexer, low noise amplifier, local oscillator, mixer, filter, modulator, demodulator, and so on. It's difficult to analyze every part in the system fully, so the emphasis is mainly on the parts designed and implemented for the RSU by myself.

和其它通信系统类似，专用短程通信系统路边单元的射频部分包含天线、双工滤波器、低噪声放大器、混频器、本振、滤波器、调制解调器等多个功能模块，论文中要完整地介绍和分析每一个功能模块是困难的，因此本文主要介绍自己亲自完成的部分。

Siemens Communications Group is one of the top three international telecom equipment venders with footprints in over 160 countries, and it takes leading position in GSM and 3G worldwide markets.

西门子通信集团是世界前列的国际通信设备提供商，足迹遍布160个国家，在全球GSM和第三代移动通信系统领域居领先地位。

Iemens Communications Group is one of the top three international telecom equipment venders with footprints in over 160 countries, and it takes leading position in GSM and 3G worldwide markets.

门子通信集团是世界前列的国际通信设备提供商，足迹遍布160个国家，在全球GSM和第三代移动通信系统领域居领先地位。

The Automatic Identification System is a kind of new-type navaid and equipments,will play an important part in maritime communication.

引言船舶自动识别系统是一种集声音、图像和数据为一体的综合的通信系统，目前在海事通信中发挥着越来越重要的作用。

An antenna device and a portable wireless communication apparatus are disclosed to securely lower a local average SAR in correspondence to at least two or more kinds of radio communication systems using different radio communication frequencies even when any radio communication frequency is used.

公开了一种天线装置和便携式无线通信装置，即使在使用任何无线通信频率的时候，也能安全降低对应于至少两种或多种无线通信系统的局部平均SAR。

At the end of the course students will be able to apply the transmission theory to the performance analysis and design of different transmission system.

使学生了解现代通信系统的组成，初步掌握对各种通信系统的分析与设计，学会分析各种数据信号、信号编码在信道中的传输性能。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。