The development of mobile communication is rapid. The development, which got started in the US in late 1970s, has come through the first generation of analogic type and the second generation of digital type so far. In the meantime, the second generation of digital cellular system has already been used all around the world, and the third generation of mobile communication, videlicet, wideband mobile communication is beginning to be commerciallized now. This article elaborates the fundamental principles, features, classification, works, multiple access, component of system, the use of frequent band, etc, with a beginning upon the basic concept and theory of mobile communication. And depend on these said starting points, it specially sets forth the tendency of mobile communication and the development and direction of CDMA.
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