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1.
刘雨聪  綦俊峰 《电声技术》2022,(12):108-111+115
介绍一种多通道同步采集、长距离级联传输的低功耗、小型化采集传输系统。系统的采集传输部分主要以现场可编程逻辑门阵列(Field Programmable Gate Array,FPGA)为主控单元,结合外围控制电路将模拟信号采集打包后,经多点低电压差分信号(Multipoint low Voltage Differential Signaling,MLVDS)总线传输至桥接板转换为百兆以太网后上传至上位机进行数据分析与处理。采用此采集传输系统方案设计,能有效地完成多路通道的同步采集传输,实现接收阵小型化设计。  相似文献   

2.
本文分析了一种具有点对多点服务能力的内部无阻塞输入/输出排队ATM交换机在反压控制下的性能指标。  相似文献   

3.
介绍了MMDS/LMDS技术的特点。从规划、业务、成本、实际应用案例等方面分析了MMDS/LMDS在移动运营环境下的优势和应注意的问题,阐述了该技术如何在移动运营环境下合理规划和应用。  相似文献   

4.
陈浩  吴家安 《电信交换》1998,(3):13-18,F003
分布式多媒体应用的出现和发展对现有的网络服务和协议提出了一个新的需求-多点播送。本文介绍了多点播送的概念以及它在Internet上TCP/IP各层的实现情况,着重阐述了一种可靠多点播送协议的系统结构,协议模型和具体实现方法,最后简要总结了多点播送技术的发展方向。  相似文献   

5.
Multicast在Internet上的实现   总被引:1,自引:0,他引:1  
张海涛  李星 《电信科学》1997,13(10):33-36
本文介绍了Internet上的一种新的数据传输方式--Multicast,着重阐述了Multicast在TCP/IP各层的实现,包括各种新的协议和应用等,最后简要介绍了Multicast技术的发展动向。  相似文献   

6.
本文首先介绍了网络容灾模型,并分析目前通信网络常用的应急措施,然后提出GSM/UMTS网中A/Iu接口启用多信令点,以实现紧急情况下业务快速割接的技术方案。针对爱立信软交换设备,描述其具体实现步骤。最后根据目前网络状况,提出容灾组网原则及模型。  相似文献   

7.
文章提出了一种多点协作传输中多点联合传输的方法,该方案将空时,频编码与波束赋形技术以及预编码技术与波束赋形技术相结合,首先进行空时/频编码和预编码处理,并将经过处理后获得的多路数据分别通过波束赋形映射到多个协作节点进行传输;然后通过空时/频编码与波束赋形技术的结合,接收方获得更大的分集增益,同时获得波束赋形增益;最后将预编码处理与波束赋形应用到多点协作中,使得各个发送节点的信号在接收方合并,从而使得各层之间的信号更加独立,并获得波束赋形增益。  相似文献   

8.
随着信息技术的发展,路由器在现代IP网络中扮演着越来越重要的角色。路由器硬件体系结构大致经历了6代。未来路由器更多的功能将以硬件方式来实现,使用交换背扳、并行处理、光交换/路由等新技术,并支持各种无线接人。从软件角度看,路由器各层协议将全面支持IPv6协议,QoS和安全功能大大增强,可以充分发挥多播优势,并使用专用、高效、可靠、稳定的操作系统作为基础平台。可以预见,下一代网络将是以IPv6光交换/路由器为核心的简单、高效、可靠的全光信息网络。  相似文献   

9.
本文从组网结构、业务应用的方面等介绍了爱立信LMDS MINI-LINKBAS的解决方案,并探讨了MINI-LINK BAS在2G/3G移动网络中的应用。  相似文献   

10.
《电子产品世界》2004,(11B):35-36
德州仪器公司(Texas Inscruments)推出据称业界首款时钟分配多点LVDS(M—LVDS)线路驱动器,为高负载底板提供高性能。该器件符合M-LVDS规范TIA/EIA-899,提供11.3  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
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.  相似文献   

14.
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.  相似文献   

15.
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.  相似文献   

16.
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.  相似文献   

17.
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.  相似文献   

18.
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.  相似文献   

19.
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.  相似文献   

20.
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  相似文献   

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