通信系统

"Varaha's uMobility 'Mobile Desk, Global Reach' solution cuts communication costs while giving Strata CIX enterprise and SMB users a new level of mobility and Unified Communications from their telephone systems," said Brian Metherell, vice president and general manager for Toshiba Information Systems, Telecommunication Systems Division.

东芝通信系统事业部信息系统总经理兼副总裁Brian Metherell 说："Varaha的uMobility "移动办公，全球可及方案帮助削减通讯成本，同时将Strata CIX企业和中小企业用户的移动能力和电话系统的统一通信能力提升至新的高度。

In this paper, we mainly study the system performance and key technologies of satellite optical CDMA communication system.

给出了卫星二维光CDMA通信系统方案和系统模型，并分析了该通信系统的系统性能。

There are five parts in this article. Firstly, it introduces the theory of TETRA and the future. And it even describes the main significance of applying TETRA in metro dispatcher system. Secondly, by comparing, it summarizes the development of Trunked system in our country. Thirdly, the principle of TETRA system is described. The fourth part is the main point of this article.

论文内容为：第一部分是从TETRA集群通信理论和应用广阔前景出发，阐述了研究TETRA在地铁调度系统中应用的重大意义；第二部分从集群发展出发，比较并总结了集群通信系统的情况，以及我国在此领域的发展状况；第三部分系统概述了TETRA系统的工作原理等技术。

As a special mobile system, the trunked system is not entirely the same as the cellular mobile system even if it inherits many advantages of the cellular communications.

作为专用移动通信系统的数字集群系统，秉承了数字通信的优点，又有别于民用的蜂窝移动移动通信。

The invention discloses a method for negotiating a voice encoding/decoding format in a communication system, in which a caller mobile station originates to negotiate the voice encoding/decoding format with a callee mobile station, the method comprises that: a mobile switch centre of the communication system receives an originating signal transmitted by the caller mobile station, the originating signal carries the number of the callee mobile station; a voice encoding/decoding format list which is latest used by the callee mobile station is acquired according to the originating signal in a database in which mobile station information is stored; the voice encoding/decoding format used when the caller mobile station is communicated with the callee mobile station is determined, and voice carrier of the caller mobile station and the callee mobile station is established in the voice encoding/decoding format.

本发明公开了一种通信系统中协商语音编解码格式的方法，主叫移动台始发与被叫移动台进行协商语音编解码格式，包括：通信系统中的移动交换中心接收到主叫移动台发送的始呼信号，该始呼信号中携带有被叫移动台的号码；根据始呼信号在存储有移动台信息的数据库中获取到被叫移动台最近使用的语音编解码格式列表；决定主叫移动台与被叫移动台进行通信时使用的语音编解码格式，并且以该语音编解码格式建立主叫移动台和被叫移动台的语音承载。

In the thesis, we described the mapping relation between the abstract module of IM and the Practical IM system by anatomizing the basic function of IM system: Presence Service and Instant Message Service.

在本文中，通过对即时通信系统基本功能——出席信息和即时消息服务的剖析，我们描述了即时通信抽象模型和与实际即时通信系统的映射关系。

This system melts Global Positing System, Geographic Information System, Global System for Mobiles communications, the technique of computer data processing and the technique of modern data communication in the integral whole. It can realize all-weather fixed position of satellites, electronic map to show and vehicle real-time monitoring and so on.

该系统融合了全球卫星定位系统、地理信息系统、全球移动通信系统以及计算机编程技术和现代数据通信技术于一体，可实现电子地图显示和车辆实时位置监控等功能。

The results show that the PCR scheme is not only suitable for urban area with high traffic load and low mobility, but also can significantly reduce the probability of dropping handovers for the freeway system, of which the traffic load is considerably high.

数值结果表明：该方案不仅适用于车辆运行速度较低、通信负载较大的城市交通系统，而且对通信负载量较大的高速公路通信系统，其越区切换的掉话率也能得到较明显地改善。

In communications, an input or output location of a communication system, it will contain the sources and sinks for the messages and those elements that control the message flow on the link, one or more transmitters and receivers, or a combination thereof, together with the necessary accessory equipment to perform a radiocommunication services, a broadcasting facility assigned a specific frequency.

在通信技术中，(1)通信系统输入或输出的地点，包含报文的源点和汇点以及链路上控制报文流的组成部分，(2)一个或多个发送器和接收器，或者它们的组合以及其它辅助器件以实现无线电通信业务，(3)一种特定频率的广播系统。

In the design and test of the communication system,communicating signal simulation possesses many advantages,such as good flexibilities,economy e.g.

在通信系统的设计、试验过程中，通信信号仿真具有灵活性好、经济等诸多优点，为通信系统研究工作带来了极大的方便。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。