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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。
WCDMA (Wideband Code Division Multiple Access) synchronous satellite communications systems are suitable for military and commercial applications and their system capacity is one of the most important parameters in system design. In order to analyze the system capacity, an interference model of WCDMA satellite is proposed. According to this model, the statistical characteristics of uplink multiple access interference are analyzed. On the premise of considering the impact of total number of cells and power control on cell capacity (uplink users) Use the numerical method to draw the cell capacity. The results show that compared with terrestrial cellular systems, the inter-cell interference of WCDMA satellite system is more serious, and most of the interference comes from adjacent cells. The system capacity is mainly limited by the number of beams and the power control accuracy. In order to obtain larger cell capacity , Power control error should be maintained within 2 dB.