中兴CDMA移动交换系统与北电CDMA系统成功对接并通过全面兼容性测试

日前,中兴通讯自主开发的ＣＤＭＡ移动交换系统与与北电ＣＤＭＡ系统对接成功,这是继今年２月份与爱立信ＣＤＭＡ基站系统成功对接之后,中兴ＣＤＭＡ产品在商用化道路上迈出的又一可喜步伐。７月２４日～３０日,在位于广州市的中山大学,中兴通讯ＣＤＭＡ移动交换系统与加拿大北方电讯公司的ＣＤＭＡ基站系统、ＣＤＭＡ移动交换系统成功实现对接,顺利通过了信息产业部组织的全面兼容性测试,测试依据为８００ＭＨｚＣＤＭＡ数字蜂窝移动通信网最新相关标准规范。此次兼容性测试包括Ａ接口信令规程检测和ＭＡＰ信令测试,所有测试项目一…     

要闻

中国首次第三代移动通信试验系统联合评估顺利完成 本刊讯信息产业部电信科学技术研究院（ＣＡＴＴ）和爱立信公司并协同日本ＤｏＣｏＭｏ公司成功地完成了中国首次第三代移动通信ＷＣＤＭＡ试验系统的联合评估测试工作。测试试验中,该试验系统成功地进行了音频／视频数据、ＵＤＩ和高速分组数据的传输,全部应用和服务都已达到预期数值。４月２４日,三方在电信科学技术研究院召开了评估测试工作的总结报告会。 １９９８年初,ＣＡＴＴ、爱立信和ＮＴＴＤｏＣｏＭｏ公司进行了测试Ｗ—ＣＤＭＡ技术实验系统的可行性研究,并决定尽快进行Ｗ—ＣＤＭＡ实验系统联合测试,目的是了解Ｗ—ＣＤＭＡ技术系统,为Ｗ一ＣＤＭＡ技术的研发、为现有的ＧＳＭ网络平滑地过渡到第三代移动通信做准备。１９９９年６月三方签署了《Ｗ－ＣＤＭＡ技术的联合测试谅解备忘录》,测试工作正式开始。 在９９北京国际无线通信设备展览会上,ＣＡＴＴ、爱立信和ＤｏＣｏＭｏ三家联合进行了Ｗ一ＣＤＭＡ技术的演示。从１９９９年４季度到今年１季度测试项目组进行了实地测试。到今年二季度,Ｗ—ＣＤＭＡ技术实验系统联合测试圆满完成。 此次评估工作是在北京市区进行的。业内人士称,测试工作的顺利完成,为中国平稳地向通...     

GaAs IC CAD及其在通信电路中的应用技术

介绍了自主开发的多个完整实用的ＧａＡｓ ＩＣ ＣＡＤ软件,包括微波无源元件建模、微波有源器件测试建模、微波毫米波ＩＣ ＣＡＤ、光电集成电路ＣＡＤ、ＧａＡｓ ＶＨＳＩＣ ＣＡＤ、微波高速ＭＣＭ ＣＡＤ等,并简要介绍了针对ＧａＡｓ工艺线的建库工作。以上软件和库已用于多个通信电路的设计。     

通信技术标准简介(二)

一、标准名称：８００ＭＨｚ ＣＤＭＡ数字蜂窝移动通信网接口测试规范：移动交换中心与基站子系统间接口ＹＤ／Ｔ １０２７—１９９９三、发布部门：中华人民共和国信息产业部四、发布日期：１９９９．１０．２０·五、实施日期：２０００．０４０１六、起草单位：信息产业部电信传输研究所七、编制原则 针对移动交换中心与基站子系统间接口（Ａ接口）的技术要求,对于保证不同厂家的ＣＤＭＡ移动交换中心（ＭＳＣ）和ＣＤＭＡ基站子系统（ＢＳＳ）在ＣＤＭＡ网络内能够互通工作,指导对Ａ接口的兼容性测试。八、编制依据 在编制Ａ接口测试…     

中兴简讯集锦

·中兴ＺＸＣ１０ -ＩＮ无线智能网率先通过新时空入网测试近日 ,中兴ＺＸＣ１０ -ＩＮ无线智能网率先通过了联通新时空组织的入网测试 ,信息产业部也向中兴通讯颁发了第一张ＣＤＭＡ无线智能网设备进网试用批文。此次测试项目包括 :ＣＤＭＡ系统设备业务控制点(ＳＣＰ)设备、业务控制点大话务量和业务管理点 (ＳＭＰ)设备。·中兴ＣＤＭＡ短消息中心率先通过兼容性测试继通过信息产业部传输所功能性测试之后 ,中兴通讯ＣＤＭＡ短消息中心系统不久前又率先成功完成与北纬等家ＣＤＭＡ短消息中心系统的兼容性测试。这次测试主要依据是《中国…     

测试精品廊

ＡｇｉｌｅｎｔＥ７４９５Ａ基站测试仪安捷伦科技的便携式基站测试仪ＡｇｉｌｅｎｔＥ７４９５Ａ(如图１所示 ) ,提供ＣＤＭＡ、ＧＳＭ、ＴＤＭＡ及ＵＭＴＳ等无线通信系统基站关键测试。结合所有最常用的ＢＴＳ测量 :功率表、ＣＷ及ＣＤＭＡ反向链路信号发生器、ＣＤＭＡ空中接口测试工具、天馈线故障分析仪、频谱分析仪、Ｔ１／Ｅ１测试仪、ＣＤＭＡ／ＵＭＴＳ／ＴＤＭＡ／ＧＳＭ的ＴＸＲＦ测试、ＣＤＭＡ／ＵＭＴＳ的ＴＸＲＦ调制分析、内置ＧＰＳ接收机。该基站测试仪具有以下特点 :·使用简便 :单一的硬键／软键接口设计和内置式辅助…     

DAC动态测试仪

本文介绍了以开环数字高频振荡发生器将ＤＡＣ输出阶梯波的任一部分,在宽带示波器上显示出来的动态测试设备。对ＤＡＣ的差分线性、镇定时间以及开关时态幅度等动态指标直观迅速的进行评价。能对几＋ＫＨｚ－几＋ＭＨｚ、字长１８Ｂｉｔ以内的ＤＡＣ进行测试。     

现代雷达接收机的CAT技术

分析了现代雷达接收机运用计算机辅助测试（ＣＡＴ）技术的必要性，重点介绍了模数变换器（ＡＤＣ）、数字正交器（ＤＱＰ）以及接收通信输出性能的有关指标、ＣＡＴ系统的测试范围及测试精度。     

中兴通讯CDMA基站系统的可靠性设计

１概述ＺＸＣ１０ -ＢＳＳ系统（ＣＤＭＡ基站系统）是中兴通讯公司推行新研发体制和可靠性设计后的一个典型项目。中兴通讯自主研发的国内首套商用化ＣＤＭＡ移动通信系统 ,包括ＣＤＭＡ移动基站、移动交换机与ＣＤＭＡ手机等产品。这些产品顺利通过了由信息产业部北京移动通信设备质量监督检验中心进行的全面入网测试 ,并通过国家无线电管理委员会对８００ＭＨｚ／１．９ＧＨｚＺＸＣ１０ -ＢＳＳＣＤＭＡ基站系统进行的型号核准测试 ,中兴通信取得了包括ＭＳＣ、ＨＬＲ、ＢＳＣ、ＢＴＳ及ＣＤＭＡ手机在内的共５张入网许可证。中兴通讯公…     

CAPI驱动软件测试系统

公共ＩＳＤＮ应用编程接口（ＣＡＰＩ）是一种基于ＩＳＤＮ终端设备的应用程序编程接口标准。依据ＣＡＰＩ标准开发的ＩＳＤＮ产品可得到大量商用应用软件（如文件传送、语音信箱、Ｉｎｔｅｒｎｅｔ接入等）的支持,从而使ＩＳＤＮ设备的研制开发工作更为有效。北京邮电大学基于ＣＡＰＩ开发了ＩＳＤＮ适配卡及相关的设备驱动程序。为了便于测试和维护所开发的产品,针对ＣＡＰＩ的特点,同时制作了相应的测试系统。该测试系统针对通     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.