摘要
理想同步CDMA系统具有很高的容量,然而在卫星移动环境下很难实现,一般采用准同步系统。该文首先仿真分析了准同步误差对宽带CDMA卫星移动通信的影响,发现CDMA系统在准同步的条件下性能有明显改观,也就是说在相同条件下能大大提高系统容量。然后针对卫星移动环境提出了一种准同步实现策略,并对其可行性进行了论证。通过分析可以看出该策略是可行的,并且轨道越高实现越容易。
The system of synchronous CDMA has large capacity, however it is difficult to implement in mobile satellite condition. So we consider establishing quasi-synchronous system. In this paper, the effect of quasi-synchronous error to broadband CDMA mobile satellite system is analyzed through computer simulation. The performance of CDMA system is improved distinctively in the condition of quasi-synchronous. This paper presented one strategy to realize quasi-synchronous in satellite environment, and discussed its feasibility. After analysis, we find that this strategy is feasible and implemented easier with the increase of orbit elevation.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2004年第4期378-382,共5页
Journal of University of Electronic Science and Technology of China
基金
国家863计划资助项目(863-317-03-06-99)
关键词
准同步
卫星移动通信
多普勒
宽带码分多址
quasi-synchronous
mobile satellite communication
doppler
broadband CDMA
