移动通信频谱重耕的实施策略探讨

介绍了国内外频谱资源的利用现状,从频谱需求、频谱效率和经济效益这3个方面分析了我国实施频谱重耕的必要性,提出了开展多网协同的频段部署、站点规划及网络优化、移动终端多模多频化的频谱重耕实施策略,以促进我国频谱资源的合理运用。     

频谱资源重规划在未来移动通信中的研究与实践

随着物联网终端用户量的快速增长、蜂窝物联网的兴起和对5G移动通信的探索,目前国内对频谱资源的重规划变得日益迫切和重要,因此通过对国内移动通信频谱资源的当下利用情况、可行性重规划等方面进行研究和分析,为未来蜂窝物联网的频谱分配、4G移动通信网的频谱扩展提出建议。     

2G频率重耕关键问题研究

2G频谱资源逐步向4G演进已成为移动通信频谱演进的主要趋势之一。本文在深入分析了2G频率重耕的产业支持情况基础上，针对国内2G保有业务量较大的实际情况，提出了一种频谱部分重耕的可用带宽分析方法，并研究了GSM与LTE系统同区域组网方案。     

"十五"期间中国移动频谱最小需求预测

本文借鉴ITU－R和UMTS论坛有关频谱需求的算法,结合中国移动通信集团移动网络建设和运营的实际特点,提出了预测移动通信频谱需求的方法,并且给出了中国移动通信集团公司在“十五”期间第二代移动通信系统GSM和第三代移动通信系统WCDMA的频谱需求预测结果。     

异构网络频谱共享在低频段重耕中的应用研究

LTE下载速率对大带宽的迫切需求、GSM网络退网的长尾效应以及传统的频谱静态分配方式,导致了900 MHz频谱资源的供需矛盾。本文研究了基于异构网络动态频谱共享的方案及在低频段重耕的应用及效果,实践表明方案在保证FDD LTE与GSM网络质量的情况下,利用频谱共享带来的错峰增益,提高了频谱利用率,并具备一定的可实施性。     

5G授权频谱分配及非授权频谱利用技术的研究

随着移动互联网和移动终端的不断发展,移动数据流量也大幅度增长。因此,在第五代蜂窝移动通信系统中,如何对现有的频谱资源进行有效的分配和利用成为了讨论和研究的热点。一方面,5G系统的频段向高频方向拓展,增大可用的频谱资源。另一方面,5G系统继续对接入技术进行演进,以实现对非授权频谱资源的充分利用。本文的内容主要分为三部分,分别对目前主流阵营的授权频谱分配计划、正处于讨论中的非授权频谱接入技术和目前的标准化进程进行了介绍。     

面向6G网络的频谱定价机制演进与展望

6G网络的异构性和复杂性将进一步提高,可用频段愈渐短缺,迫切需要更为灵活高效的频谱资源管理模式。使用市场化定价手段促进频谱资源的高效利用,为纾解6G频谱短缺困境提供了解决方案。首先简要分析了6G移动网络的频谱资源新特点,接着梳理了数十年来频谱管理和定价机制的演进进程,包括基于博弈论、拍卖模型的定价机制研究和基于人工智能的定价机制研究等成果。最后,对面向6G移动网络的频谱定价机制进行了展望,为标准化工作提供借鉴和参考。     

一种基于MR大数据的频谱重耕网络覆盖性能评估方法与应用

通过现存承载2/3G业务的CDMA无线网MR信息,结合4G无线网覆盖性能要求,实现对频谱重耕后4G无线网覆盖性能的评估,对于4G网络的快速建设、准确补盲补弱以及稳定运行具有重要意义。该评估方法可应用到各种2/3G制式网络的频谱重耕中,既能较准确地评估未来重耕后的4G覆盖效果,又能节省大量4G网络规划仿真、拉网路测的人力物力,是一种对重耕网络进行覆盖效果评估的快捷手段。     

频谱共享应用中的动态频率规划方案探讨

适应频谱动态变化的频率规划方法是蜂窝移动通信系统实现频谱共享应用的核心问题之一.本文在充分考虑频谱资源时变特性和蜂窝移动通信系统频率复用技术特点的基础上,提出了一种适应频谱动态变化的动态频率规划技术,为未来频谱共享蜂窝无线通信系统的实际大规模网络应用奠定了基础.     

个人移动通信频谱需求分析

分析了移动通信市场发展的特点,通过预测远期移动用户及业务状况.使用ITU-RM.1390计算方法估算了移动通信2G、3G混合组网阶段对频谱资源的需求情况,并分析了3G独立组网后频谱资源估算方法.     

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