Simulator for radio resources management functions in CDMA systems

Mobile network technologies have been experiencing great progress. Simulations and analysis of these systems are challenging tasks. Different network simulation and modelling tools have already been developed. However, these simulation and modelling tools are commercial, they are focused on the physical layer simulations or they are simply unavailable. Hence, the own simulation program was created in Matlab. This paper gives a brief review of several simulation tools and presents its own simulation program. This program enables simulation of radio resources management functions for Code Division Multiple Access (CDMA) systems. Finally, simulation results obtained by using the proposed simulator are also presented.     

时滞大惯性对象随动性能的改善

以时滞大惯性加热炉为被控对象,通过试验建模得到对象模型参数,应用Siemenss7-300自整定调节器和结构控制语言SCL构建Smith预估控制系统。研究常规单回路系统、常规Smith预估系统以及增益自适应Smith预估系统在时滞大惯性时象情况下的随动响应性能。实际运行表明,增益自适应Smith预估系统控制质量明显提高,尤其在对象参数与预估器参数失配后,能够有效地改善系统的随动响应和鲁棒性。     

请重新认识您的客户

在网络时代 ,在今天。重新认识你的客户 ,已成为大大小小的商业组织必须修好的第一课。一、请重新认识您的客户按最长的时间算起 ,网络时代在全球揭开序幕仅有三十年的历史。三十年来 ,网络技术、网络企业及网络经济发生了巨大的变化和飞速的发展 ,深刻地改变了当代世界经济的面貌和商务经营的模式 ,但是另一个往往被忽视的也发生了巨大变化的角色就是 :客户 ,他们与时代一起成长和成熟起来。在网络时代 ,客户获得和累积知识的水平、自由选择和购买商品与服务的能力、获取信息的方式和能力、对商业信息和行为作出反应的能力等等 ,与“前网络…     

Design and evaluation of an adaptive icon toolbar

As information systems become increasingly important in many different domains, the potential to adapt them to individual users and their needs also becomes more important. Adaptive user interfaces offer many possible ways to adjust displays and improve procedures for a user's individual patterns of work. This paper describes an attempt to design an adaptive user interface in a computer environment familiar to many users. According to one classification of adaptive user interfaces, the adaptive bar described in this paper would be classified as a user-controlled self-adaptation system.At the user's convenience, the adaptive bar offers suggestions for adding or removing command icons, based on the frequency and probability of specific commands. It also implements these changes once the user has agreed to them. Beyond the adaptive bar, the general behavior of the whole user interface does not change, thereby allowing the user to maintain a clear general model of the system. This paper describes the decision-making algorithm implemented in the bar. It also describes the bar's self-adaptive behavior of displaying the frequency of each icon's use through the icon's size. Finally, we present some encouraging preliminary results of evaluations by users.     

一种应用于谐振式微型光学陀螺的高频锁相放大器的设计

谐振式微型光学陀螺(R-MOG)是利用光学Sagnac效应实现对转动检测的一种高精度的惯性传感器件.在R-MOG系统中,信号处理具有非常重要的地位.根据R-MOG系统中,集成光学环形谐振腔的谱线宽度高达几十MHz以及R-MOG输出信号具有弱信号、大噪声特点,设计了一种用于提取被噪声淹没的微弱信号的高频锁相放大器.在对高频锁相放大器各部分电路进行具体设计和分析的基础上,完成了对整体电路的性能测试.测试结果表明,研制的锁相放大器在载波频率为30MHz时的等效输入噪声为11nV/Hz.将整个电路应用于R-MOG系统中,解调出的信号效果良好.