利用MR数据定位室内用户分布指导5G深度覆盖规划方案的研究

本文介绍了现有常规深度覆盖规划流程,对其优缺点进行了梳理,分析了利用MR定位室内用户分布指导5G深度覆盖规划的合理性,提出了利用MR数据进行室内外用户采样点区分的方法,制定了利用MR数据精确定位室内外用户分布区域的方案,确定了利用MR定位室内用户分布指导5G深度覆盖规划的流程,对利用MR定位室内用户分布指导5G深度覆盖...     

利用MR定位室内用户分布指导5G深度覆盖规划方案的研究

本文分析了现有深度覆盖规划流程,对现有的流程优缺点进行了梳理,分析了利用MR定位室内用户分布指导5G深度覆盖规划的合理性,提出了利用MR数据进行室内外用户采样点区分的方法,提出了利用MR数据精确定位室内外用户分布区域的方案,提出了利用MR定位室内用户分布指导5G深度覆盖规划的流程,对利用MR定位室内用户分布指导5G深度覆盖规划流程应用实现进行了阐述。     

基于分场景的WCDMA室内分布系统规划优化研究分析

针对WCMDA室内分布系统不同场景存在的网络质量问题,通过话务量、MR覆盖、导频污染、容量、网络故障等方面对室分WCMDA网络现状进行多维度的评估分析,创新建立基于MR数据分析的分场景室内分布优化评估体系,有效解决了室内深度覆盖网络问题,实现了室分WCDMA网络质量和用户感知的同步提升。     

数字化室分系统应用研究及未来5G室内覆盖展望

针对4G用户和VoLTE用户的快速增长以及室内移动业务的快速提升，尤其是视频、手游和网络直播等对数据业务的高要求，室内深度覆盖问题成为各大运营商建设精品网络、抢占市场，创造经济效益的重要环节。新型数字化分布系统，相比传统的DAS系统，具有高效吸收话务、灵活快速组网及快速实施的能力，能够对目标区域达到全监控、高定位、高容量、易协同及多制式覆盖的效果，是LTE网络室内深度覆盖的不二选择，亦是5G室内网络覆盖的必然趋势。     

基于NB-IoT网络覆盖的最小投资方法研究

构建了NB-IoT网络与需求满足度的评估体系,该体系基于有4G覆盖区域的A-GPS MR数据和无覆盖区域的仿真预测,考虑了网络制式的覆盖差异因子、不同典型场景覆盖差异因子及不同承载频率的覆盖差异因子,形成20×20 m的、可迭代更新的底层NB-IoT网络覆盖数据库,并利用最小投资算法成功实现NB-IoT网络与市场满足度评估以及最小开站规模评估,实现网络覆盖评估和投资效益最大化,加快5G的mMTC场景应用业务推广。     

基于射线追踪传播模型实现5G室内分布系统仿真的研究

室内分布系统的建设已经成为解决深度覆盖问题的有效手段。目前,5G网络建设发展迅速,室内分布系统建设呈爆炸式增长,室内分布系统的网络规划和设计需要更加精细化。如何有效评估室内信号覆盖效果,成为当前室内分布系统规划设计的重要任务之一。以某大楼为研究对象,用射线追踪传播模型仿真计算覆盖性能指标,并将结果与现有网络的路测数据进行对比。经过校正相关模型参数实现仿真与实测一致,论证仿真为网络部署提供了参考依据。     

多频段多系统MR合并，预测频率重耕后5G多频组网覆盖效果

传统MR覆盖评估方法只能评估现网单系统网络的覆盖效果,无法评估频率重耕后的多频段网络覆盖效果,而且存在“幸存者偏差”问题,导致评估数据不完整。随着5G网络普及,4G网络频率重耕提上日程,需要探索有效方法提前评估并预测频率重耕后5G多频组网的覆盖效果。文章通过合并多频段多系统的MR数据进行网络覆盖还原,改进了传统MR覆盖评估方法中存在的不足,提升了网络覆盖评估的准确性,并能预测频率重耕后5G多频组网覆盖效果,支撑网络规划与建设。     

浅析TD-LTE室内深度覆盖解决方案

随着移动通信技术的不断演进,4G网络技术在室内覆盖系统中得到广泛应用.4G技术的引进有效地提高了运营商的网络容量,为用户提供更好的服务和体验.据统计,大量的移动数据业务发生于室内,室内覆盖的性能与质量对运营商的客户体验及收益产生重大影响.TD-LTE网络属于高频段组网,空间传播、穿透损耗相对较大,因此室内深度覆盖成为网络部署的重点与难点.本文结合实际工程经验,通过分析传统室内覆盖建设模式及存在问题,介绍新技术手段在室内深度覆盖中的应用,为下一步TD-LTE网络室内深度覆盖建设和优化提供借鉴.     

WCDMA室内分布系统设计要点

室内分布系统是提高网络覆盖的广度和深度、吸收室内话务和提高通信质量的有效手段。由于3G侧重于数据业务,而数据业务更多发生在室内。因此,3G室内分布系统的设计显得尤为重要。深入分析了WCDMA室内分布系统设计要点,结合中国目前的GSM系统平滑演进到WCDMA系统的室内覆盖方案升级改造策略,在WCDMA的商用前夜为下一阶段的网络建设提供参考。     

TD-LTE深度覆盖解决方案研究

良好的网络室内覆盖在确保网络覆盖和质量竞争优势、确保用户业务体验方面发挥着极其重要的作用,移动数据业务已超越语音业务成为流量和收入的主体。根据国外数据统计,70%以上的移动数据业务发生在室内,室内覆盖的性能将直接影响运营商的客户体验及其收益。由于TD-LTE使用频率普遍高于2G/3G系统,TD-LTE室内覆盖将面临严峻挑战。     

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