HSPA+及其关键技术

为了对逐渐成熟的HSPA技术作进一步改进,3GPP给出了新的演进方案HSPA .该方案在原有技术基础之上将更多的新技术引入其中.文中通过与LTE进行对比,来介绍了HSPA 的性能目标,并且分析了HSPA 中的MIMO、分组数据的连续传输、高阶调制等关键技术,以及未来可能会引入的新技术.文中进一步讨论了HSPA 发展趋势和演进过程中可能会存在的问题.     

打造高品质的WCDMA网络

经过长时间的准备后,中国迎来了3G大规模的网络建设时期.WCDMA作为3G中最主要的技术已经演进到了HSPA阶段.HSPA技术无论是从网络到终端都已经非常成熟,已经被业界广泛地接受为WCDMA网络建设的起点.HSPA相对于R99无论是在关键技术还是在频谱效率以及网络性能上都有很大的不同.这些差异使得我们在建设HSPA网络时,在引入策略、网络设计规划以及网络优化等方面除了借鉴R99的经验外,更需要针对HSPA具体特性做出深入细致的分析.     

HSPA+终端标准现状及分析

HSPA 终端分类情况 HSPA 是HSPA(3GPP R6)的向下演进版本,是上下行能力增强的一项技术,在FDD系统中,上下行资源是分开处理的,因此这里讨论的HSPA 的终端类别要分别从上下两个角度进行.     

TD-SCDMA HSPA+关键技术及标准进展

1 引言 为了增强对于数据业务的支持.TD-SCDMA在3GPPRel 5和Rel 7中分别引入了HSDPA(高速下行分组接入)技术和HSUPA(高速上行分组接入)技术(合称HSPA).而TD-SCDMA在3GPP Rel 8中启动了一个新的研究项目HSPA ,对HSPA进行了进一步的演进和增强.本文介绍了TD-SCDMA HSPA 的目标、关键技术和标准进展.     

HSPA

推荐理由:HSPA成功投入商用,优势正在显现.据GSA的最新统计,截至2007年6月底.全球GSM/EDGE/WCDMA/HSPA用户总数达25.4亿,占全球移动用户的85.4%,去年同期这一数字为82.2%;其中,WCDMA/HSPA用户达到1.37亿.     

HSPA／HSPA＋现状分析及展望

总结了HSPA及其演进（HSPA＋）标准的发展历程,描述了全球HSPA／HSPA＋市场的现状,从终端消费者和和产业生态链的角度,分析了HSPA／HSPA＋市场蓬勃发展的原因,并结合运营商的成功案例,展望了HSPA／HSPA＋市场可持续性发展的前景。     

从TD全国精品网直奔4G

去年今日,我曾在<移动通信>上提出中国运营商究竟是应该遵循3G演进规律,按部就班地从3G→HSPA→HSPA+→LTE,还是在现有HSPA阶段等待LTE成熟一步到位LTE?当时我的观点是登上3G的顶上台阶HSPA+直奔4G.时过境迁,今天又将如何对待?     

HSPA应用现状及网络演进分析

文章介绍了HSPA的应用现状,分析了HSPA的发展趋势,同时给出了HSPA 的主要特点、网络结构、与HSPA的关系,明确了HSPA 是HSPA的下一个平滑演进版本。     

基于HSPA+基站建设本地光传输网应对策略研究

为满足HSPA+基站升级对本地传输网新增带宽和端口需求,通过对HSPA+基站新增带宽和端口需求预测,分析总结本地光传输网建设原则和系统组织原则,提出基于HSPA+基站建设本地光传输网应对策略.     

产品推介

嵌入式系统CEVA推出基于CEVA-XC DSP的HSPA+软件物理层IPCEVA经充分优化的HSPA+软件程序库,适用于CEVA-XC DSP。在CEVA-XC软件定义无线电参考架构中增加新的程序库,能够实施基于软件的多模HSPA/HSPA+/LTE/LTE-A解决方案。对HSPA和HSPA+的支持是为     

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.     

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.     

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.     

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.     

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.