中兴通讯UTRAN传输解决方案

无线接入网部分的传输网建设是3G网络建设的重要组成部分.结合WCDMA网络特点,给出了适合建设无线接入网传输网的各种解决方案,包括SDH技术、MSTP技术、ATM交换机,以及利用基站级联组网等.最后给出了适应WCDMA网络演进的传输解决方案.     

MINI-LINK无线传输产品应对3G时代的挑战

在3G无线通信系统中,随着系统容量的提高,传输是一个不可回避的重要问题,尤其是无线接入网部分的传输(即如何把基站的业务有效地收敛到RNC与核心网节点)。对于RAN的传输,有许多解决方案,例如采用SHDSL,光纤MSTP系统等,而无线接入技术则是一种重要的选择方案。爱立信公司的《MINI-LINK无线传输产品应对3G时代的挑战》一文详细介绍了爱立信MINI-LINK无线传输系列产品的特点,即该系列产品具有多种模式,既可以用作E1/T1汇聚节点作为2G网络的解决方案,也可以作为ATM业务汇聚节点为3G网络提供传输资源,并且网管功能强大、安装方便,在实际网络中也已得到应用。该文对于新旧运营商在构造3G传输网络时具有重要的借鉴意义。     

MSTP在3G的应用

讨论了MSTP的技术特点,指出MSTP能高效可靠传输各种业务,并结合3G网络的业务发展以及3G传输关注的接口,提出采用引入ATM功能的MSTP技术解决3G传输网络的方案.     

我国3G光传输网技术演进趋势

全业务时代的竞争格局,必然促使移动网络的IP化进程。我国3G牌照发放后,基站回传(Backhaul)光传输网建设已成为我国电信网建设的主要驱动力。本文首先分析了3G网络组成,具体分析了基站回传网络建设中采用多业务传输平台(MSTP)和分组传输网(PTN)的特点和发展趋势,论述了PTN必将发展为无线接入网(RAN)IP化的主流技术。     

3G光传输网建议方案

从3G核心网和接入网的各种速率接口着手,分析了不断增长的3G业务对传输网的需求;同时以MSTP技术为基础,介绍了3G网中核心网和接入网的传输解决方案。     

面向EVDO3G传输网络建设与优化

随着C网EVDO(evolution data only)网络的全面铺开,合理的传输网建设和优化是基础.结合电信现有某资源和网络结构,对MSTP(多业务传送平台)传输网平滑升级,同时试点PTN(分组传送网)和IPRAN(基于IP传输的无线接入网)城域网,寻求建设可靠的3G传送网,以满足EVDO3G网络的可持续发展.     

面向3G的传输网络

随着数据业务的飞速发展,数据接入的可移动性要求不断突现,支持高带宽可移动无线数据接入的第三代移动通信技术(3G)浮出水面.第三代移动通信技术(3G)具有第二代移动通信技术(2G)无法比拟的优势,高带宽高质量和多类型的移动服务等,但同时也对于基站到基站控制器、基站控制器之间以及基站控制器到3G核心节点(如移动交换中心(MSC)等)之间信号传输提出了新的要求。城域多业务传送平台(MSTP)的出现延长了SDH的寿命,是"光发展低潮"中的亮点。结合新一代MSTP的关键技术及MSTP未来的发展,而3G技术是无线通信乃至整个通信界的重要发展方向,传输专业也要与时俱进地适应这种变化。本文在浅析了3G网络的结构、接口类型和业务承载和介绍了几种传统的3G无线网传输网络解决方案的基础上,根据MSTP技术的发展及提供多业务的能力,结合现代城域网的建设提出了相关的适应3G发展方向的传输网络解决方案,并对其可行性作了具体论述。     

TD-SCDMA Iub接口的传输方式

首先介绍三种TD-SCDMA Iub接口传输方式的具体实施方案,即基于同步数字体系(SDH)传输网的透明传输方式、基于SDH+ATM交换机的传输方式以及基于MSTP传输网的传输方式,详细分析它们各自的优缺点;然后介绍如何根据实际网络合理地选择适合本地的传输方式;最后对TD-SCDMA无线接入网传输方案进行了展望。     

3G传输组网方案探讨

随着3G技术的成熟,3G业务的实用化前景已经指日可待,3G网络与传输网络组网时采用哪种方案才是最经济最高效的方式?本文将对3G与SDH、ATM、MSTP三种传输平台组网     

港湾网络OpCity 10G级别MSTP设备

OpCity 8630 10G级别的MSTP设备 随着城域网中数据业务量的日益增长,城域汇聚层面临带宽扩容、业务调度的压力,STM-64级别传输设备的应用领域逐渐由核心层延伸到汇聚层。港湾网络OpCity 8630作为业界最小体积的STM-64/STM-16兼容MSTP设备,提供城域核心层/汇聚层低成本的10G传输解决方案,从而迎合城域网带宽平滑扩容的发展趋势。 ◇业界体积最小的10G传输设备,降低对机房空间的要求; ◇L1/L2双内核体系结构,提供TDM业务和数据业务最优传输解决方案; ◇TDM业务交叉处理内核,提供80G/512×512 VC-4交叉处理能力; ◇提供ATM接口,通过ATM反向复用(IMA)技术,实现对ATM业务的传     

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.     

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.     

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.     

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.     

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