数据通信 毕业论文外文文献英文翻译.doc.docVIP

郑州轻工业学院 本科毕业设计（论文） ——英文翻译 题 目 差错控制编码解决加性噪声的仿真 学生姓名 专业班级 通信工程05-2 学 号 12 院 （系） 计算机与通信工程学院 指导教师 完成时间 2009年4月26日 英文原文: Data communications Gildas Avoine and Philippe Oechslin EPFL, Lausanne, Switzerland fgildas.avoine, philippe.oechsling@ep.ch Abstract Data communications are communications and computer technology resulting from the combination of a new means of communication. To transfer information between the two places must have transmission channel, according to the different transmission media, there is wired data communications and wireless data communications division. But they are through the transmission channel data link terminals and computers, different locations of implementation of the data terminal software and hardware and the sharing of information resources. 1 The development of data communications The first phase: the main language, through the human, horsepower, war and other means of transmission of original information. Phase II: Letter Post. (An increase means the dissemination of information) The third stage: printing. (Expand the scope of information dissemination) Phase IV: telegraph, telephone, radio. (Electric to enter the time) Fifth stage: the information age, with the exception of language information, there are data, images, text and so on. 1.1 The history of modern data communications Communication as a Telecommunications are from the 19th century, the beginning Year 30. Faraday discovered electromagnetic induction in 1831. Morse invented telegraph in 1837. Maxwells electromagnetic theory in 1833. Bell invented the telephone in 1876. Marconi invented radio in 1895. Telecom has opened up in the new era. Tube invented in 1906 in order to simulate the development of communications.Sampling theorem of Nyquist criteria In 1928. Shannong theorem in 1948. The invention o