电磁波与电磁场在通信与互联网中的应用.docVIP

电磁波与电磁场在通信与互联网中的应用 摘要 电磁场与电磁波作为无线电技术的理论基础，集中于三大类应用问题的研究。电磁场（电磁波）作为能量的一种形式，是当今最重要的能源，其研究领域涉及能量的生产、存储、交换、传输和综合利用。电磁波作为信息传送的载体，传输信息的主要技术之一，主要研究信息的产生、获取、交换、传输、处理、再现和综合利用。在无线通信方面作为信息的主要载体，其研究领域涉及信息的产生、储存、变换、传输和综合利用，成为人们交流信息的重要技术。即对无线技术的研究就是对电磁波传输的研究。从08年中国电信业务重组后，到09年1月中国3G牌照的发放，中国电信正式进入3G时代，中国电信由传统的基础网络运营商转型为全业务的综合信息服务提供商。面对来自中国移动和中国联通的激烈竞争，中国电信借助3G和Wi-Fi网络同时提供差异化的无线宽带服务，建立自己独有的竞争优势。本文主要介绍中国电信的无线通信技术CDMA2000。 关键字：电磁波，电磁场，能量，通信，信息，中国电信，CDMA2000 Abstract Electromagnetic field and electromagnetic wave as the theoretical basis of radio technology, has focused on three types of application study of the problem. Emf (electromagnetic wave) as a form of energy is the most important source of energy, its research areas related to energy production, storage, exchange, transfer and comprehensive utilization. Electromagnetic wave as the carrier of information transmission, one of the main technology of transmission information, mainly is the study of the production of information, access, switching, transmission, processing, and comprehensive utilization. In the aspect of wireless communication as the main carrier of information, its research area involves information production, storage, conversion, transmission and utilization, as an important technology of the people to exchange information. The research on wireless technology is the study of electromagnetic wave transmission. From 08 after restructuring of China telecom business, to January 09, the issuance of 3 g licenses, China formally entered the 3 g era, China telecom, China telecom transformation from the traditional foundation network operator for the whole business of integrated information service provider. Faced with fierce competition from China mobile and China unicom, China telecom with 3 g and wi-fi networks at the same time provide differentiated wireless broadband services, set up their own unique competitive advantage. This paper mainly introduces the China telecom wireless communication techn