3G网络不同制式的比较与运营分析

分析了不同的3G制式之间的技术差异,不同无线制式之间的技术差异以及国外运营3G网络的成功和失败案例.四种3G制式各有利弊,不同的国家、不同的运营商都需要根据自己的情况选择适合自己的3G制式.     

我国3G业务发展策略分析

文章从3G业务的分类,市场定位入手,对3G业务进行了评估、分别给出了3G业务不同客户发展策略以及不同制式发展策略,并给出了3G业务推出的时间路标.     

3G网络不同制式的比较与运营分析

分析了不同的3G制式之间的技术差异，不同无线制式之间的技术差异以及国外运营3G网络的成功和失败案例。四种3G制式各有利弊，不同的国家、不同的运营商都需要根据自己的情况选择适合自己的3G制式。     

第三代移动No.7信令网

第三代移动No.7信令网(简称3G信令网)是3G业务网络的重要支撑网之一，不同制式、不同业务及网络的不同发展阶段对3G信令网有不同的要求，因此对于运营商，特别是新兴的移动运营商，必须充分认识3G信令网的特点、需求，明确3G信令网的发展方向，才能提出真正具有指导意义的发展策略，才能构建一个结构清晰、安全可靠、适合3G业务发展的信令网络。     

运营商3G投资博弈

运营商3G投资策略分析。投资发展3G是未来国内运营商的必然选择，但如何投资发展3G，不同的运营商会有不同的考虑和选择。从自身发展战略、3G发展定位、可分配资源等情况出发，不同的运营商将选择最有利于自身竞争和发展需要的投资策略。笔者认为，现阶段对国内主要运营商而言，有以下三种合理的3G投资策略可供选择。     

4G移动通信技术

人们在享受3G移动通信系统商用所带来服务的同时,4G移动通信技术的研究已在悄然进行。文章简要分析了4G的网络结构及其关键技术,如正交频分复用（OFDM）、软件无线电、智能天线技术、多输入多输出（MIMO）技术。比较了3G和4G不同指标,分析了3G和4G采用的不同技术。最后对全球4G的现状和发展进行了初步探讨。     

如何规划3G网络

随着时间推移，3G移动通信技术日渐成熟，3G网络的部署已经提到日程上来。有关3G网络的设计原则更多地从无线网络设计、规划及优化来考虑。实际上，由于从设计的理念上来说，3G与2G及2．5G的网络是有显著不同的，这种不同，除了表现     

第三季度中国集成电路市场增长趋缓

据信产部规划，国产3G终端需要在11月25日以前，达到一定的稳定性、可靠性。目前，国产3G终端不负众望，基本达到测试要求。昨天，国产3G联盟秘书长杨骅透露，国产3G终端的基本功能都已实现，只是不同厂商开发思路不同，在产品性能上不完全一致。     

2G／3G共存时期终端与智能卡的兼容性分析

文章首先从2G与3G的认证鉴权的不同入手,分析72G、3G智能卡对认证鉴权方式的支持,接下来分析了2G和3G终端各个版本与智能卡的兼容性,并对运营商提出建议。     

3G无线接入网络规划中的共容策略

随着时间的推移,3G移动通信技术日渐成熟,3G网络的部署已经提到日程上来,有关3G网络的设计原则更多地从无线网络设计、规划及优化来考虑。实际上,由于从设计的理念来说,3G与2G及2.5G的网络有着显著不同,这种不同,除了表现在无线接入网络的设计上外,还表现在核心网络的设计、支撑系统的规划、业务平台的开发等许多方面。3G网络的设计是比较复杂的,本文仅就一些大的原则提出3G无线网络设计的基本思想,并提出与现有系统共     

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.     

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.     

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.     

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.     

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.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks