我国数字蜂窝移动通信发展策略研究

分析了甸蜂窝移动通信的发展现状，简述了数字蜂窝移动通信在社会经济中的作用和商业人对ＧＳＭ和ＣＤＭＡ两种数字蜂窝移动通信技术的特点进行比较，提出了我国数字蜂窝移动通信的发展策略。     

移动通信的成就：从第七届世界电信展览会看数字移动通信的发展

盛况空前的ＴＥＬＥＣＯＭ＇９５，全面展示了世界电信技术的最新发展状况，有近千家公司参展。在展出的六大数通信新技术新产品中，移动通信是重场戏之一。近四年来，数字移动通信特别是ＧＳＭ在全球得到了迅猛发展。本文主要介绍数字移动通信的发展概况，并提出加速发展我国移动通信产业的建议。     

我国数字蜂窝移动通信发展策略研究

分析了我国蜂窝移动通信的发展现状，简述了数字蜂窝移动通信在社会经济中的作用和商业价值。并对ＧＳＭ和ＣＤＭＡ两种数字蜂窝移动通信技术的特点进行比较，提出了我国数字蜂窝移动通信的发展策略。     

“蜂窝革命”的成就：—从第七届世界电信展览会看数字移动通信的发展

盛况空前的ＴＥＬＥＣＯＭ９５，全面展示了世界电信技术的最新发展状况，近千家公司参展．在展出的六大类通信新技术新产品中，移动通信是重场戏之一。近四年来，数字移动通信特别是ＧＳＭ在全球得到了迅猛发展。本文主要介绍数字移动通信的发展概况．并提出加速发展我国移动通信产业的建议。     

奋起振兴我国民族移动通信工业

全球移动通信技术的发展已厅三个阶段，当前的公众移动通信新技术层出不穷，新系统不断涌现。我国移动通信运营业增长非常迅猛，预计“九五”期间将有４千亿元的巨大市场。     

关于我国3G发展问题的探讨

分析了我国移动通信的发展趋势及我国发展第三代移动通信的宏观环境，阐释了我国3G运营商和制造商的博弈关系，对我国第三代移动通信的发展提出了几点建议。     

关于第四代移动通信的思考与探索

第三代移动通信即将面市，人们已开始谈论２１世纪未来一代无线移动通信的发展前景，其中第四代移动通信已提上议事日程。文章扼要探讨了其发展的必要性、基本特征、系统结构以及演进到第四代的基本步骤，最后提出了我国发展第四代移动通信的建议。     

GSM的发展趋势和建议

综述了世界ＧＳＭ移动通信的现状，对我国的移动通信的未来进行阶段分析，就我国移动通信的发展及应研究的问题提出了个人见解。     

中国移动通信行业20年发展浅思

2007年，是我国内地大规模蜂窝式移动通信系统正式商用20周年。20年来，我国移动通信产业从无到有、从小到大，以前所未有的发展速度引起了全世界的瞩目。与20年前相比，我国移动通信的网络规模、技术层次和服务水平都发生了飞跃，移动通信行业也从当初制约经济建设的瓶颈一跃成为国民经济的基础产业和先导产业，为国家经济建设和社会发展提供了有力支撑。在我国移动通信行业即将步入新的发展转折期时，在我国电信行业即将直面加入WTO面临的挑战之时，这20年的风雨历程，20年的艰辛努力，20年的辉煌成就，20年的经验教训，尤其值得我们追忆，值得我们总结，值得我们思考。     

我国未来移动通信研究开发展望

本文简述了国内移动通信的发展现状与趋势，重点论述了国际上有关Beyond 3G移动通信发展动向，提出了我国发展未来移动通信的基本技术需求，概述了我国有关Beyond 3G研究计划-FuTURE计划的安排与步骤。     

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