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近年来,世界通信技术发展很快,特别是有线通信向无线移动通信的发展十分迅速,各国纷纷增加对移动通信网建设的投资,使这一刚刚兴起的通信技术新领域展现出诱人的前景。从发达国家竟相开发的重点来看,当前移动通信正向业务种类多、频道间隔小、卫星通信与无线电通信相结合的数字化,综合化和小型化三个方向发展。1.数字化能提供更先进的非话音业务当前的移动通信主要是传输话音,与通常打电话一样,也是通过基地台和移动台直接通
In recent years, the world’s communication technology has developed rapidly. In particular, the rapid development of wired communication to wireless mobile communication has been rapidly developed. All countries have successively increased their investments in the construction of mobile communication networks, thus making the newly emerging new area of communication technology an attractive prospect . According to the key points developed by developed countries, the development of digital, integrated and miniaturized mobile communications is moving towards more types of services, fewer channel intervals, and a combination of satellite communications and radio communications. 1. Digitization can provide more advanced non-voice services The current mobile communications mainly transmit voice, just as usual, but also through the base station and the mobile station directly