随着手机的普及，新一代移动通信系统的研究正如火如荼地进行中，从1995年问世的第一代(1G)模拟制式手机，到1996到1997年出现的第二代(2G)GSM、TDMA等数字制式手机，在经历了前两代的发展之后第三代(3G)移动通信技术手机，技术已经变得越来越成熟。中国的3G牌照在2009年1月7日正式下发，分别是移动(TD-SCDMA)，联通(WCDMA)电信(CDMA2000)，标明了中国正式进入3G时代！而3G网络也代表着这一技术的发展方向，而这一技术的研究并不是只言片语可以阐明，而这一技术的研究也显得非常地重要。 本论文完整的介绍了TD-SCDMA，WCDMA，CDMA2000三种不同的3G移动通信国际主流标准，覆盖了3G系统整体架构和相关知识点，对基础原理，无线接口技术，3G网络的特点，以及通信系统双工方式进行了阐述。 关键词：3G，移动通信，无线接口技术，双工方式 With the popularity of mobile phones， next-generation mobile communication system is in the middle of the study carried out in 1995 came from the first generation (1G) analog mobile phone system to the years 1996-1997 the second generation (2G) GSM， TDMA， the number of standard mobile phones， after the first two generations after the development of third generation (3G) mobile communications technology mobile phones， technology has become more and more China's 3G license in January 7， 2009 issued a formal， namely mobile (TD-SCDMA)， Unicom (WCDMA) telecommunications (CDMA2000)， marked China's formal entry into the 3G era! The 3G network also represents the direction of development of this technology， and this technology is not a word or two can be clarified， and this technology is also very This paper describes a complete TD-SCDMA， WCDMA， CDMA2000 three different international mainstream 3G mobile communications standard， covering the overall framework of 3G systems and related knowledge， the basic principle of the wireless interface technology， 3G network characteristics， as well as communication duplex mode system are Keywords: 3G， mobile communications， wireless interface technology， duplex mode
