基于双面反射镜的N×N光开关的特性分析和实验研究

报道了基于双面反射镜的N×N光开关器件。介绍了使用双面反射镜的2×2, 4×4光开关的集成光路设计和工作原理; 采用Benes网络, 以2×2和4×4光开关为基本单元的N×N光开关器件的整体结构, 并根据“一笔画”原理, 分析了4×4, 8×8和16×16光开关矩阵的可重排无阻塞特性和光开关矩阵的光路选择算法。最后, 基于2×2, 4×4光开关技术制备了16×16光开关矩阵。测试表明, 该器件具有良好的插入损耗、回波损耗、串扰和开关时间等性能, 从而验证了设计思想和工艺的可行性。在基于双面反射镜的光开关矩

AN EFFICIENT ITERATIVE DFT-BASED CHANNEL ESTIMATION FOR MIMO-OFDM SYSTEMS ON MULTIPATH CHANNELS

In this paper, an efficient iterative discrete Fourier transform (DFT) -based channel estimator with good performance for multiple-input and multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems such as IEEE 802.11n which retain some sub-carriers as null sub-carriers (or virtual carriers) is proposed. In order to eliminate the mean-square error (MSE) floor effect existed in conventional DFT-based channel estimators, we proposed a low-complexity method to detect the significant channel impulse response (CIR) taps, which neither need any statistical channel information nor a predetermined threshold value. Analysis and simulation results show that the proposed method has much better performance than conventional DFT-based channel estimators and without MSE floor effect.

A Simplified Soft-output QRD-M MIMO Detector

In this paper, a low-complexity soft-output QRD-M detection algorithm is proposed for high-throughput Multiple-input multiple-output (MIMO) systems. By employing novel expansion on demand and distributed sorting scheme, the proposed algorithm can reduce 70% and 85% foundational operations for 16-QAM and 64-QAM respectively compared to the conventional QRD-M algorithm. Furthermore, the proposed algorithm can yield soft information to improve the bit error rate (BER) performance. Simulation results show that the proposed algorithm can achieve a near-NIL detection performance with less foundational operations

一种基于VNC的智能应用服务系统的设计和实现

VNC是网络计算领域的一个重要发展,适用于运行在"瘦客户端"甚至"极瘦客户端"的终端设备上.但VNC在网络安全、会话保持、信息管理、交互性和兼容性功能上的不足与缺陷,使之并不能够应用于应用服务系统.该文面向应用服务系统,基于VNC并针对VNC的不足之处,扩展了其协议,增加了安全层,以及对用户会话的管理机制,设计实现了一个智能应用服务系统.

Silicon: the promising material for phontonic integrated circuits platform

The development of optical network demands integrated arid multiple functionality modules to lowing cost and acquire highly reliability. Among the various contender materials to be photonic integrated circuits platform, silicon exhibits dominant characteristics and is the most promising platform materials. The paper compares the characteristics of some candidate materials with silicon and reviews recent progress in silicon based photonic integration technology. Tile challenges to silicon for optical integration for optical networking application arc also indicated.

Wavelength tunable electroabsorption modulated DFB baser with thin film heater

　

mer-(4-aminobenzenesulfonato-kappa N)triapua(1,10-phenanthroline-kappa N-2,N ')cobalt(II) chloride

Both coordination and hydrogen bonds contribute to networking in the supramolecular title compound, [Co(C6H6NO3S)(C12H8N2)(H2O)(3)]Cl, which contains a discrete [Co(C6H6NO3S)(C12H8N2)(H2O)(3)](+) complex cation, formed by one 4-aminobenzenesulfonate ligand, one 1,10-phenanthroline ligand and three coordinated water molecules, together with one uncoordinated chloride anion. These discrete cations and chloride anions are connected by hydrogen-bonding interactions into a two-dimensional supramolecular motif. Further hydrogen-bonding interactions consolidate the structural architecture and extend the two-dimensional supramolecular structure into a three-dimensional network.

第十三章 面向离散工厂自动化的无线通信及网络技术

随着工业无线技术研究的发展,其应用领域已经开始由过程自动化转向离散工厂自动化。与过程自动化相比,工厂自动化对无线通信技术提出了新的需求与挑战。本文阐述了目前无线通信技术在工厂自动化应用中要解决的问题,给出了当前国内外的研究进展。

基于IP QoS技术的网络机器人遥操作研究

针对基于 Internet机器人遥操作中存在的问题 ,结合 Internet网络技术的最新发展 ,借助 IP Qo S技术的特点和优势 ,本文研究并设计了基于集成业务体系结构的网络机器人遥操作系统 .通过分析 IP Qo S技术和机器人遥操作技术相互结合的可行性与合理性 ,表明该系统能够克服目前在 Internet遥操作过程中存在的问题并可在未来支持 IP Qo S技术的 Internet中发挥作用 .本文提出了该系统的设计原型及实现方法 .

载人潜器半物理虚拟仿真系统及其性能分析

为了缩短深海载人潜器控制系统的开发周期,测试系统性能,根据载人潜器的自身特点,构建和实现了载人潜器所有传感器、执行器设备模拟,以及潜器在海底实景的运动状态的半物理虚拟仿真系统。首先,以仿真系统的硬件架构和数据流程为基础,重点介绍了潜器设备模拟的软件体系结构;其次,在仿真平台上测试了各种网络数据的传输延迟,分析了其整体性能;最后,得出了潜器控制器设计的时间约束。现阶段整个系统已经开发成功,并投入运行到潜器控制系统的安装调试中。

变速箱试验环线集成控制系统

研究当前国内外变速箱试验系统的特点,基于现代汽车变速箱生产信息化、网络化和柔性化的要求,依托某变速箱装配线项目,针对其试验环线,提出一种具有并行结构的变速箱自动试验环线,并设计基于Device Net的控制系统,探究试验环线的智能控制。该系统已经进入实际应用,可较好地完成变速箱的性能检测以及试验后的数据分析。