Network is known well for everyone . along with the logbit / s technology used in trunk network , the developing of access network is go without saying . the passive optical network based on asynchronous transfer mode ( apon ) present the broadband access technique for 21 century because of agility and saving 基于异步传输模式的无源光网络( apon )结合了atm的多业务多比特率支持能力和pon的透明宽带传送能力,以其经济性和灵活性成为21世纪理想的光纤接入方案。
Each function model is drived to load the related table of databse using the advaced data access technique of ado . net object , so that these functions including manageing user , cleaning up data , inputing or importing data , updating data , exporting data and querying data and so on come true 通过先进的数据访问技术ado net驱动各个功能模块调用库的数据表,实现了用户管理、数据整理、录入或导入、更新和输出以及数据查询等功能。客户端程序采用visualbasic
Moreover , the central data model of epicentre in the posc specifications are classified and illustrated , on the basis of which the paper studies data mapping techniques of the model and provides the language description of express and the examples of how to realize loading data in the light of the data types of seismic models in epicentre . meanwhile , this paper explains the fundamental principles and methods of the data access and exchange techniques , presents the related steps of realizing way with examples analysis and proposes some personal understanding and thinking of data access techniques based on oracle database 在此基础上,研究了该模型的数据映射技术,对epicentre中地震模型的一些数据类型给出了express语言描述和数据加载实现方法的例程;同时研究了数据存取技术,阐明了数据存取的基本原理和方法,给出了相关的实现方法步骤并用posc提供的数据存取与交换接口函数daeapi结合c + +语言对相关方法进行了实现,并提供了部分例程分析。
Capacity and performance of mobile radio systems essentially depend on the choice of the multiple access scheme . a novel and promising wireless digital modulation / multiple access technique called multicarrier cdma is studied in this thesis , including reducing the peak - to - average ratio , which is one of its key techniques . mc - cdma is combination of ofdm and cdma , thus advantages of both techniques are exploited 移动通信系统的容量和性能在很大程度上取决于多址方案的选择,本文主要讨论了在通信领域新兴的扩频多址方式一多载波cdma ( mc - cdma ) ,并对降低mc - cdma系统峰值平均功率比这一关键技术进行了研究。
The cdma technique has come to be the primary multiple access techniques for the third generation mobile communication systems . consequently , this thesis focuses on the smart antenna technique and its applications in ds / cdma mobile communication systems , which the author ' s main contributions include Cdma系统固有的诸多优点使其成为第三代移动通信系统的主流体制,因此,本文主要研究了智能天线技术在ds / cdma系统中的应用,具体工作如下: *较为系统地介绍了智能天线的基本概念。