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Internet 应用的普及使通信进入多媒体时代,多媒体通信流给网络带宽带来了巨大压力,宽带化成为通信发展大趋势。正是在这种背景下,以宽带多媒体为特征的第三代移动通信技术在近两年得到快速发展。最近,第三代移动通信技术标准化工作在 ITU 和各国各地区的标准化组织的积极推动下,进展迅速。由于第三代系统部署将在明年起开始在全球陆续展开,因此,从现有网络向第三代网络的技术演进问题成为专家们讨论的焦点.在去年10月份的 ITU 芬兰会议上,第三代移动通信(IMT-2000)的无线接口技术规范得通过,标志着第三代技术的格局最终确定。它分为 CDMA 和TDMA 两大类共五种技术,其中主流技术为三种 CDMA 技术:IMT-2000CDMA-DS(直接扩频)即欧洲和日本
The popularization of Internet application has brought the communication into the multimedia era. The multimedia communication flow has brought tremendous pressure on the network bandwidth, and broadband has become the general trend of communication development. It is against this background that the third generation mobile communication technology featuring broadband multimedia has been rapidly developed in recent two years. Recently, the standardization of the third generation mobile communication technology has progressed rapidly with the active promotion of the ITU and various standardization organizations in various regions of the world. Since the deployment of the third generation system will start to take place globally in the next year, the issue of technology evolution from the existing network to the third generation network has become the focus of discussion among experts. At the last ITU Finland meeting in October, the third On behalf of mobile communications (IMT-2000) wireless interface specification passed, marking the final pattern of the third generation technology. It is divided into two major categories of CDMA and TDMA a total of five kinds of technologies, of which the mainstream technology for the three CDMA technologies: IMT-2000CDMA-DS (direct spread spectrum) that Europe and Japan