新的信道复用技术：素数复用

为了提高信道利用率，根据素数积的惟一分解特性，提出一种新的信道复用技术：素数复用，并阐述了素数复用的工作原理和优缺点。素数复用特别适用于终端用户复用或终端功能复用。     

统计复用信道的数字用户环路复用设备

将信道传输容量动态分配技术应用于数字用户环路复用设备中，可用效地解决复用设备线路复用率和话音传输质量之间的矛盾，从而使复用设备具有最佳的传输效果。本文介绍了一种性能优良的统计复用信道的数字用户环路复用设备。     

光复用新技术

光纤最重要的一个特点是容量大,可以传送高速率的数字信号。为了更进一步提高光纤的利用率,参考已经比较成熟的电复用方法,人们采用了各种光的复用方法。如波分复用、频分复用、时分复用、空分复用、副载波复用、码分复用等。其中,被认为最具潜力的是波分复用、频分复用和码分复用。 一、波分复用技术（WDM） 所谓波分复用是指在一根光纤上,不只是传送一个光载波,而是同时传送多个波长不同的光载波。这样一来,原来在一根光纤上只能传送一个光载波的单一光信道变为可传送多个不同波长光载波的光信道,使得光纤的传输能力成倍增加。…     

DWDM技术的进展

1　波分复用 (ＷＤＭ)技术波分复用技术指在一芯光纤中同时传输多个不同光波波长信道的技术。一芯光纤传输一个光波波长信道的系统如图 1所示 ,由于“电子瓶颈”的限制 ,系统的通信容量不可能有很大的增长。采用波分复用技术 ,不同的波长信道可以同时在一芯光纤中传输 (如图 2所示 ) ,使通信容量成倍或数十倍、数百倍地增长 ,以满足日益增长的信息传输需求。在波分复用技术研究初期 ,人们将1 .3μｍ和 1 .55μｍ的波长信道复用到一芯光纤中传输 ,这是最简单的波分复用 ,或称作粗波分复用。此复用方案中 ,一芯光纤只能传输两个波长信道 ,即通…     

融熔型窄复用信道间隔波分复用器的研制

对如何实现偏振不敏感的窄复用信道间隔波分复用器进行了分析,采用熔融拉锥技术,实现了复用信道间隔为２５ｎｍ,波长隔离度为１８ｄＢ的波分复用器,并预计可以实现具有更窄复用信道间隔的波分复用器。     

TD-HSPA控制信道空分复用技术创新应用

TD-SCDMA系统对于要支持4倍空分复用功能需至少配置相应4对数的HS-SCCH/HS-SICH控制信道,这使得HSPA带宽降低或接入用户数下降,影响HSPA业务信道空分复用的效果容量.为此,提出了控制信道空分复用技术,它有效的解决了该问题.     

智能天线系统中信道空分复用问题的研究

本文阐述了智能天线（ｓｍａｒｔ ａｎｔｅｎｎａ）空分复用系统中的重要概念－信道方向图的概念，提出子一种高效的搜算算法，用于解决信道复用中的组合寻优问题。最后以本文的搜索算法为基础进行仿真，得到了关于智能天线系统中有关信道复用的若干有用结论。     

DWDM系统光纤光栅分插复用器的设计与实现

综合分析了均匀光纤光栅主反射带内、外反射谱和透射色散特性对DWDM系统光波分插复用的影响，分析计算了DWDM系统中信道参数与光纤光栅参数之间的关系，在此基础上，对用于波分复用系统信道间距分别为50/100GHZ的光波分插复用的光纤光栅进行了设计，并在实验中刻制出相庆的光纤光栅。     

TD-SCDMA传输信道编码复用与解码解复用的仿真

TD-SCDMA标准是由中国提出的,以我国知识产权为主的、被国际上广泛接受和认可的无线通信国际标准。本文主要研究TD-SCDMA上行链路物理层的核心技术即传输信道编解码和复用解复用技术。TD-SCDMA采用了比较完善的编码复用方案,首先对数据流进行复杂的编码和复用,经过物理信道映射之后再对数据进行扩频加扰和调制,最后由天线以适当的功率发射出去。本文对编码复用以及解码解复用过程建立仿真模型,讨论了模型中各模块的具体实现算法。在MATLAB中对TD-SCDMA上行链路物理层传输信道编码复用和解码解复用过程进行了仿真,验证了算法的正确性。     

TD-SCDMA_HSDPA伴随信道帧分复用技术分析与容量提升

文章通过研究HSDPA的帧和时隙结构,分析HSDPA伴随信道在复用的情况下,对HSDPA单载波接入用户数的影响;通过研究验证商用终端对HSDPA伴随信道帧分复用功能的支持情况,评估在商用网络中开启HSDPA伴随信道帧分复用功能的影响,为后续HSDPA伴随信道帧分复用功能规模应用提供依据。     

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.     

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