说明：  介绍了CDMA 2000-1X系统,CDMA 网络发展及演进， 网络结构，系统提供的业务，无线传输 ... 定位业务,流媒体类业务,CDMA2000-1X系统使用的基本技术,CDMA系统中使用的调制/解调技术
(introduced CDMA 2000-1X system, the CDMA network development and the evolution of network architecture, the system provides business, wireless transmission ... positioning business, helped by lingering hopes that business flow, CDMA2000-1X system used in basic skills CDMA system used in the modulation/demodulation techniques )