WCDMA系统中无线接入网建模的研究

本文主要讨论了第三代移动通信WCDMA系统无线接入网（RAN）建模中的几个关键模型的建立，包括典型业务模型和多小区模型，同时在分析WCDMA系统无线接入网结构的基础上，建立了WCDMA系统多业务、多小区的仿真平台，并对这种多业务、多小区情况下的系统容量进行了探讨。     

基于J2EE的WCDMA网管系统的方案改进

介绍了满足电信管理网(TMN)规范的移动通信网管系统,提出基于J2EE的WCDMA网管系统的改进方案,即增加远程访问能力,支持组件热部署,提高数据存储效率,加强网管系统与通信设备的信息交互能力等。结果表明,网管系统的功能得到了有效提高和完善。     

创建基于PC平台的网管开发系统

随着电信网络的快速发展,电信网的网络管理逐步扩充、完善,向电信管理网（ＴＭＮ）发展。未来的电信管理网将具有统一的体制和规范,信息模型要规范化,通信协议要标准化。本文着重谈网管系统的信息模型规范化,提出了创建基于ＰＣ平台网管开发系统的设想,并对该系统的基本功能和接口进行了讨论。     

解决CDMA直放站网管的简易方案

中国联通的CDMA网已开始投入商用，一期基站采用了大量的CDMA直放站设备，而且大部分CDMA直放站都与GSM基站共址，以解决CDMA网络覆盖问题，这些直放站大都是孤立站点。为了更好地为用户服务，对CDMA直放站进行监控是必须的，因此各个直放站厂家都对自己的CDMA直放站配备了自己的网管系统。CDMA直放站网管系统构成目前CDMA直放站网管系统都是由网管系统硬件（网管PC机或工作站、无线MODEM）和网管软件构成。系统构成如图1所示。CDMA直放站的一些运行信息、电源信息、门禁信息以及相应的告警信息通过直放站内部的传输通道…     

对交换网管系统的认识及建议(续前)

四、功能的改进要求交换机网管系统的优越性不仅在于实现对各交换机的集中操作维护，还体现在其网管功能上。网管功能是对交换机输出到网管系统上的信息（话务统计报告、告警信息。指令操作输出信息等）进行处理分析，辅助网络管理人员对整个交换网进行管理维护的有力工具。1．报告处理分析功能（l）交换机各种报告的处理分析功能对交换机各种报告的处理分析，是网管系统的网管功能的体现，交换机输出报告有定时话务统计报告、告警报告、指令输出报告以及各种诊断测试报告等，这些报告共同反映交换机和网络设备的运行状态。对交换机各种报告…     

CDMA和WCDMA系统室外邻频干扰问题研究

分析了由于CDMA（码分多址）系统与WCDMA（宽带码分多址）系统频段上相邻所造成的系统性能影响，建立了一个采用接收机灵敏度指标作为系统性能恶化和干扰程度的衡量指标的系统间邻频干扰模型。在评估灵敏度与干扰之间的影响基础上，对系统共存所需的空间隔离度进行计算，并且在CDMA和WCDMA共站址的环境下进行验证，实验结果有效的验证了理论仿真模型。结果表明通过适当降低接收机灵敏度，在满足相关协议要求的情况下，能够有效的减少系统间干扰的影响，达到系统共站址和共存的目的。该模型也可以适用于其他2G通信系统与WCDMA系统共存的干扰分析。     

GSM与WCDMA综合网管融合策略与实现

第三代移动通信网络牌照发放之后,国内运营商大规模开展3G网络建设,于是在国内出现了GSM／WCDMA,CDMAIX／EVDO,GSM／TD—SCDMA三种组合型网络。如何融合2G与3G综合网管系统、节约建设成本、有效地提升3G网络运维效率是当前综合网管建设的重大课题之一。文章通过对GSM与WCDMA移动通信网络融合情况的分析,以及对新一代网管系统的研究,探讨GSM与WCDMA统一融合的省级综合网管建设策略,以及省内建设过程中的具体实施步骤及可能遇到的问题。     

广播电视网络的监控与管理（上）

本阐述了广播电视网络建立网管系统的必要性和迫切性,介绍了ISO网管标准的五大管理功能和网管协议--简单网络管理协议（SNMP）和公共管理信息协议（CMIP）。     

移动通信机房动力及环境监控系统与本地网管系统的互联

介绍地市级移动通信分公司本地网动力及环境监控系统集中监控中心（CS）与本地网管中心（LMNSC）网络互联的组网结构和系统功能设计的情况,重点讨论了地市级本地网动力环境集中监控中心（CSC）、本地网管中心的监控信息传输技术、动力设备告警监控、视频监视、报表及数据提取分析及与本地网管中心的接口技术等几个具体问题的解决方法。     

基于Web的本地电话网网管系统

探讨了利用Ｗｅｂ技术实现本地电话网网管系统的方法。为了实现基于Ｗｅｂ的网管,就必须实现现有的基于ＣＭＩＰ／ＳＮＭＰ（公共管理信息协议／简单网络管理协议）的网管协议向基于Ｗｅｂ的网管协议的迁移。建立了基于Ｗｅｂ的网管与ＣＭＩＰ／ＳＮＭＰ代理的网关接口和ＭＩＢ（管理信息库）网关接口来解决这个问题,并结合实际,给出了一个基于Ｗｅｂ方式的网管信息系统的实例,同时探讨了该方法的发展趋势。     

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.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

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.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

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.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.