一种基于位置更新机制的WCDMA用户屏蔽选通系统实现方案

提出了一种基于位置更新机制的WCDMA用户屏蔽选通系统实现方案。该方案利用WCDMA小区重选、身份识别和位置更新的机制,通过建立虚拟小区,诱使用户发起小区重选。通过控制信令流程,在用户位置更新过程中发起身份识别过程,获得用户的身份信息,并通过伪造位置更新回复信令,实现对覆盖范围内用户的通信屏蔽与选通。WCDMA用户屏蔽选通系统在不影响用户正常通信情况下,屏蔽非法用户的通信,可以有效应对WCDMA移动网络违规使用所带来的安全隐患。     

基于智能手机的伪基站检测方法

GSM网络有自身的安全缺陷,采用的是单向认证机制,使得不法分子有机可乘。伪基站技术便是利用这一脆弱性,发送垃圾短信、诈骗短信、严重影响正常通信,已然成为2014年国家重点打击对象。针对以上问题,在Ubuntu平台上结合USRP硬件和OpenBTS、GNURadio等软件所搭建的环境对伪基站功能进行模拟,根据伪基站信号特征和工作原理,在此基础上,利用智能手机所有收集到的基站信息,发现一种检测伪基站信号的方法,此方法可以检测出大部分的伪基站信号,给打击伪基站带来了一定的帮助,可以达到一定防治伪基站的效果。     

浅析伪基站的主动识别与主动防御

伪基站利用GSM系统的"单向鉴权"的缺陷,恶意向用户发送垃圾短信。详细阐明伪基站的工作原理、发送垃圾短信的信令流程,总结分析伪基站的技术特征,提出了借助A+Abis信令系统及时、有效的主动识别伪基站,进而采取更加积极主动的防御措施。     

伪基站系统的工作原理及识别方法研究

伪基站系统能够模拟任意主叫用户发送任意数量、任意内容的垃圾短信,具有严重的社会危害。文章描述了伪基站系统的工作原理和特点,包括其工作流程、相对正常GSM基站修改的主要参数和信令流程;并根据伪基站的特点提出了识别伪基站的方法。     

5G“伪基站”主动探测系统模型设计及应用研究

分析了“伪基站”的工作原理和5G网络面临的“伪基站”威胁,提出了5G“伪基站”主动探测系统设计模型。5G“伪基站”主动探测系统集中应用了UE（用户终端设备）辅助测量功能、测量信息分析系统、“伪基站”自动定位系统和“伪基站”地理呈现系统等关键技术,将“伪基站”定位呈现可视化,将“伪基站”攻击不可预测、被动防御的方式转化为主动探测、判定与发现,并精确定位“伪基站”。力争从根本上解决“伪基站”对5G网络的信息安全威胁,为协助公安系统打击利用“伪基站”实施网络犯罪活动提供重要技术支撑。     

浅析“伪基站”原理及查找方法

“伪基站”非法占用频谱资源发送垃圾短信,其内容严重危害正常通信安全和社会稳定,已经成为社会关注的热点问题之一.本文结合实际工作,深入分析“伪基站”监测系统工作原理,发现“伪基站”与正常基站不同之处,利用“伪基站”监测系统多次进行“伪基站”查找测试,解决查找“伪基站”过程中出现的问题,对今后提高“伪基站”查找工作效率、维护通信安全和社会稳定有一定的作用.     

浅谈爱立信RBS200／2202基站电源监控系统

随着移动通信高速发展，基站数量越来越多。如何实现GSM低成本无缝覆盖、解决用户的正常接入、提高网络通信质量等已经成为移动网络建设中首要面对的问题。确保网络设备的正常运行是以基站通信设备正常工作为前提的，而电源系统是基站设备的“血脉”，所以对电源系统的及时监控、掌握设备运行的第一手信息是设备正常运行的保证。黑龙江省七台河市地区属于矿区，许多基站用电由矿物局电力系统提供，由于矿物局电力系统经常停电，在基站没有电源监控时，停电几小时以至基站已停止运行时，交换机房才能发现，这严重影响了移动公司的信誉和收入，同时也给维护工作带来了很大的不便，针对此现象，我们提出了一套完善基站电源监控系统的方案。     

伪基站侦测技术应用研究

伪基站的技术随着无委、公安的不断打击,也不断的演变和进步,具有效率更高、反侦察跟踪、隐藏性越来越好、成本越来越低、智能化的特点。伪基站侦测技术也随之不断发展,无线网络优化人员通过优化GSM系统参数,减少伪基站影响范围,通过对信令数据进行大数据挖掘,实现对伪基站的定位和跟踪,通过特定算法侦测出操作伪基站的不法分子手机号码进行定位和跟踪,通过研发伪搜索定位仪在现场对伪基站进行精准定位和跟踪。     

5G超密集网络环境下功率控制方案研究

超密集网络(Ultra Dense Network,UDN)是一种通过密集化地部署各种低功率小基站来提升系统容量的技术,因可以解决小区覆盖盲区、实现用户无缝连接、缓解宏基站压力以及配置灵活等优点被列为未来5G通信系统的关键技术之一。在密集基站的网络部署下,基站与终端的路径损耗有所降低,在增大有益信号的同时也提升了干扰信号,影响通信系统的性能和用户终端的服务质量。为提升用户的服务质量和降低系统损耗,提出了一种跨层功率最大化方案,选取发射功率最强的小基站作为服务基站。提出一种协作功率最大化控制方案,选取2个小基站为用户提供协作式数据传输服务。仿真结果表明,2种方案均能提升用户的服务质量,后者在能效等指标上要优于前者。     

通过跨网漫游实现移动通信覆盖的方案探探

主要讨论了GSM网中利用他网运营商的无线覆盖实现本网用户通信服务的2种方案，并通过对移动通信各个流程的技术分析对2种方案进行了对比，从而为国内通信运营商在边远地区合作实现移动通信覆盖提供借鉴。     

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