现代通信直放站监控技术的分析与研究

对目前国内通信直放站的现状做了具体的分析,阐述了直放站监控技术的必要性.从结构、功能的角度对当前直放站监控系统做了具体的介绍,从硬件的角度分析了基于单片机监控系统发展过程及其工作原理,通过软件流程的研究,提出了软件设计方法.根据当前趋势简要说明了直放站监控系统的建设现状,并对今后的发展趋势做出展望.     

3G时代的移动通信直放站监控技术

随着3G网络建设工程的启动,3G直放站设备的监控也纳入日程。当前3G移动通信产业逐步走向商用化阶段,直放站设备作为移动通信网络优化的重要设备,在增强信号覆盖,提高网络传播速度,降低网络运行成本方面的作用越来越显著,因此其在移动通信网络覆盖中的地位已日趋重要。     

基于一维光子晶体高阶禁带性质的带阻滤波器研究

设计了一种基于一维光子晶体(PC,photonic crystal)高阶禁带性质的新型带阻滤波器,其结构形式为Si(空气|Si)5,晶格周期长度为15μm,滤波中心频率位于1.55μm,带宽约为10nm。利用光刻和ICP(inductively coupled plasma)刻蚀技术,将这一滤波器制作在SOI材料上,并对其透射谱特性进行理论计算和实验测量。结果表明,理论计算和实验测量的结果吻合良好,证明了高阶禁带是降低PC加工难度的有效方法。     

Dynamical Properties of a Diluted Dipolar-Interaction Heisenberg Spin Glass

Up to now the chirality is seldom studied in the diluted spin glass although many investigations have been performed on the site-ordered Edwards-Anderson model. By simulation, we investigate the dynamicaJ properties of both the spin-glass and the chiral-glass phases in a diluted dipolar system, which was manifested to have a spin-glass transition by recent numerical study. By scaling we find that both phases have the same aging behavior and closer aging parameterμ. Similarly, the domains grow in the same way and both phases have a closer barrier exponent g2. It means that both the spins and the chirality have the same dynamical properties and they may freeze at the same temperature.