摘要
WCDMA(宽带码分多址)同步卫星通信系统适用于军事和商业应用,其系统容量是系统设计最重要的参数之一。为分析系统容量,提出了WCDMA同步卫星的干扰模型,并据此模型分析了上行链路多址干扰的统计特性,在考虑小区总数和功率控制对小区容量(上行用户数)影响的前提下,利用数值方法得出小区容量。研究表明:与地面蜂窝系统相比,WCDMA同步卫星系统小区间干扰更为严重,其中大部分干扰来自相邻小区;系统容量主要受限于波束数量和功率控制精度,为得到较大的小区容量,功率控制误差应维持在2 dB以内。
Wideband code division multiple access（WCDMA） geosynchronous（GEO） satellite system has been used for both military and commercial applications,the capacity of which is one of the key parameters.An interference model for the WCDMA GEO satellite communication system was developed to analyze the system capacity,namely the maximum acceptable number of users per cell in uplink.Accordingly,the statistical characteristics of uplink multiple access interference were investigated,while the influence of the amounts of cell in coverage and power control on the cell capacity was taken into account,leading to a numerical result of the capacity.The results show that the inter-cell interference mostly comes from the nearest cells,which is more severe compared with ground cellular systems.The system capacity is limited by the beam amount and the power control precision.The power control error should be maintained within 2 dB to obtain reasonable performance.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第10期1660-1663,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家"九七三"重点基础研究项目(2007CB310601)
关键词
宽带码分多址
同步卫星
多址干扰
小区容量
wideband code division multiple access
geosynchronous satellite communication system
multiple access interference
cell capacity
