一、概述近年来数字通信技术随着电子器件特别是集成技术的迅猛发展而获得了日新月异的变化。更为引人注目的是数字通信技术所独有的快速准确及抗干扰性好、大容量和便于加密等模拟技术,无可比拟的优点促进了数字通信技术的发展。目前,国外有普遍应用之势。而应 I. Overview In recent years, digital communications technology with the rapid development of electronic devices, especially integrated technology has made rapid changes. What attracts more attention is that digital communications technology is unique and fast, accurate and anti-interference, large capacity and easy to encrypt simulation technology, unparalleled advantages to promote the development of digital communications technology. At present, there are universal applications of foreign potential. Instead