The Universal Mobile Telecommunication System

The concepts, requirements, and technologies of Europe's third generation mobile communication system-the Universal Mobile Telecommunications System (UMTS)-are discussed. The cellular architecture, radio resource, adaptive resource allocation and handover enabling techniques for realizing an effective UMTS access network are described. The modulation schemes, multiple access methods, and duplexing methods used in the third generation mobile system's flexible radio interface are also described. The architecture, mobility support, and protocol development of the UMTS fixed network are outlined     

平流层通信系统中差错控制技术浅析

分析并给出了平流层通信系统的网络结构模型,指出ATM无线传输技术是平流层通信系统的主要技术.着重分析了ATM无线传输中几种差错控制的方法,并对平流层通信系统中的应用提出了建议.     

The potential of satellite solar power

The role of solar energy is being investigated to establish its potential contributions to meeting future energy demands on a significant national and world scale. This role is briefly reviewed to provide the background for considering the advantages of converting solar energy in space. The technology options for converting solar energy in space and transmitting power to earth are outlined. The design concepts of the SSPS based on thermal-electric and photovoltaic conversion are examined and salient characteristics are provided. Details of microwave power generation, beam transmission, and rectification and utility power pool interfaces are discussed. The requirements for a space transportation system, orbital assembly, maintenance and manufacturing in space are reviewed. The results of economic projections of SSPS operations are presented, utility economics outlined, and institutional impacts and legal status of the use of outer space considered. The environmental impacts of SSPS operations, such as stratospheric pollution by space vehicle exhaust products and of the microwave beam, including atmospheric attenuation and scattering, ionospheric propagation, and microwave biological effects are highlighted. A development program for the SSPS is outlined and critical technology areas which will have to be developed before the SSPS can be commercialized are mentioned.     

通信系统软件设计初探

本首先阐述了现代大型通信系统中软件设计的一些要求。然后根据自己在3G软件开发过程中的一些经验，分析了软件设计的原则和技巧。     

电信综合集中告警系统

文章根据电信运营商对综合集中告警系统的需求,提出实现全专业、多厂商的集中告警管理,实现运营支撑系统(OSS)应用的闭环工作流程。文章分析了运营商对综合集中告警系统的需求,描述了综合集中告警系统定位、功能以及系统总体结构等。     

通信设备的接地

本介绍通信中心大楼和居住建筑物的新接地方法以及通信设备的防雷保护。     

通信系统中的语音编码技术

语音编解码技术现已成为通信技术的一个重要学科。本文在简要介绍通信系统中语音编码技术的基础上,着重论述了参数编码的残差激励线性预测编码(RELP)算法。这种线性预测编码是一种新的压缩方法,可使码率降低到2.4kb/s以下。     

通信电源系统中的直流配电

文中介绍通信电源系统中直流配电的作用及其主要的配电方式——低阻配电和高阻配电的原理,重点说明了高阻配电的使用条件,并通过计算分析和应用实例说明了高阻配电的优越性。     

移动通信网中的数据库系统

为实现移动通信的各种网络功能,在移动网中设立了各种不同功能的数据库。文章分析了移动网络数据库系统的功能、特点和结构,探讨了网络数据库的多重并发性和数据一致性的问题并介绍了网络数据库适应个人通信发展的演进技术和策略。     

通信电源系统结构的发展趋势

由于数据通信设备和电信网络设备的融合，要求有一个能为数据通信设备和电信设备供电的新的可靠的电源系统，传统的通信电源系统结构面临着变化和挑战。本文分析现代通信电源系统结构的发展趋势，介绍几种可能的系统结构。     

电信IT支撑系统——因时而变

IT支撑系统是电信运营商转型中的重要组成部分,成为运营商差异化竞争的关键因素.lT支撑系统必须因时而变,更新自身角色,从支撑者转变为驱动者;增强自身功能,强化对产业链掌控、深度运营和全业务支撑等功能;优化系统技术架构,采用整体规划、集中化、虚拟化的模式进行系统建设.     

Wide-band CDMA for the UMTS/IMT-2000 satellite component

This paper describes the main aspects relevant to the development of a third-generation radio transmission technology (RTT) concept identified as satellite wide-band CDMA (SW-CDMA), which has been accepted by the International Telecommunications Union (ITU) as one of the possible RTTs for the satellite component of International Mobile Telecommunications-2000 (IMT-2000). The main outcomes of the extensive system engineering effort that has led to the above ITU RTT are described. In particular, we address propagation channel characteristics, satellite diversity, power control, pilot channel, code acquisition, digital modulation and spreading format, interference mitigation, and resource allocation. Due to its similarity with respect to the terrestrial W-CDMA proposal from which it is derived, the SW-CDMA open air interface solution is described briefly, with emphasis only on the major adaptation required to best cope with the satellite environment. Quantitative results concerning the physical-layer performance over realistic channel conditions, for both forward and reverse link, are reported. A system capacity study case for a low-Earth-orbit constellation is also provided     

面向电信的商业智能系统

首先介绍了商业智能的概念，着着描述了电信行业中商业智能系统的体系结构，功能及特点。     

通信电源集中监控系统

针对通信电源智能化的需要,研制了一套通信电源集中监控系统。该系统以PC机为上位机,单片机系统为下位机。实现了对电源电压、电流、工作状态等的数据采集,以及对模块运行状态,系统设置,告警信息等的遥信和遥控。     

电信网资源管理中的专家系统方法

本文首先介绍了电信网资源管理和专家系统的概念和意义,然后介绍了电信网资源管理系统的功能,接下来讨论了专家系统的结构,最后给出了在电信网资源管理系统中实现专家系统的方法和特点。     

实时保护 灾难无畏——HP电信行业刀片解决方案

在过去的几十年中,全球的电信运营商们已经习惯了由降低风险、管理成本以及提高质量等因素组成的三维空间.但瞬息万变的市场环境,要求企业必须全面动起来,即增强业务灵活性.这是企业需要增加的全新一维--业务灵活性,不仅仅赋予了管理成本、提高质量与降低风险这个原有的三维空间以全新的内容,更使IT环境能适应变化的业务需求,将IT技术与IT投资回报带入一个全新时代.     

Multi-Agent Coordination System forTelecommunication Business Management

1introductionWiththedevelopmentoftelecommunicationservice,itbecomesmoreandmoredifficulttobuildamanagementsystemfortelecommunicationbusinesses.Therearemanyfactorscontributingtothisdifficulty.Thenumberandvarietyofdatasourcesandservicesaredramaticallyincreasingeveryday.Theavailability,typeandreliabilityofinformationareconstantlychanging.Sodothediversityoftelecomservices,theheterogeneousenvironment,thelegacydata,theperformanceofeachworkingunit,thespatialdistributionofallsources,andsoon.Therefore,…     

一种卫星定位组件测试软件的设计与实现

卫星定位组件作为一门较新项目,同时作为对可靠性要求至高的高科技武器产品中的重要组件,在保证产品的可靠性方面,需要构建高覆盖面的组件测试方法,通过充分测试暴露产品问题才能更好地提高产品的性能,保证可靠性。卫星定位组件测试软件利用串口技术能够实时接收解调组件的输出数据,直观显示所有定位数据信息,为组件开发者判断组件的工作状态提供依据,同时软件要有数据存储和二次计算的能力,处理能力能够覆盖组件所有测试参数。     

电信综合告警集中显示系统方案

目前,电信现有的各类网管和监控系统的监控终端都各自独立,告警的显示都完全不同.监控中心的监控人员如果需要查看各系统的告警,必须要在不同终端上打开各自的告警界面,这样一来不能及时发现各系统的告警,二来费时费力.通过对各种网管监控系统结构的分析,论述了各类网管系统的告警信息的采集方法,并给出了综合告警的集中显示和确认的方案.