摘要
介绍了 3G(第 3代移动通信系统)中WCDMA(宽带码分多址)系统与TD SCDMA(时分同步码多分址)系统的HSDPA(高速下行分组接入 )技术以及CDMA2000系统的 1xEV DO和 1xEV DV技术原理,展示了这些技术的最新发展状况和关键技术,分析了自适应调制技术、快速功率控制等在高速分组接入中的应用,并对这些分组接入技术进行了对比,展望了 3G分组接入技术的发展方向,提出高速分组接入技术向超 3G发展演进的发展趋势。
As one of the most important services in the 3rd generation mobile communication systems,high speed packet data service is being developed continuously at present. This paper introduces the high speed access technologies for 3G systems, which include high speed downlink packet access （HSDPA） for WCDMA and TD-SCDMA systems, l x EV-DO and l x EV-DV for CDMA2000 system. We show the latest state of development and the related key technology, analyze the application of the adaptive modulation and fast power control technology, etc.. We compare these three technologies in terms of the uplink and downlink speed, bandwidth, and power control, etc. , then show the prospect of the development of 3G systems＇ packet access technology and the trend beyond 3G systems.
出处
《电子工程师》
2005年第3期28-31,共4页
Electronic Engineer
