摘要
根据高空平台CDMA系统的邻小区干扰因子小于地面CDMA系统的特点,分析了现有环状小区分布结构存在的问题,提出一种多层小区分布结构,即相邻层的地面小区间间隔着若干层高空平台小区.推导出了高空平台-地面CDMA同频系统上行链路容量的表达式,比较了环状小区结构和多层小区结构下系统上行链路容量的大小.仿真表明,小区总层数为10时,环状结构下高空平台上行链路容量和地面上行链路容量分别为97.4和97.6,多层结构下高空平台上行链路容量和地面上行链路容量增加至111.9和110.2.
According to the characteristic that the inter-cell interference factor of the HAPS CDMA system is lower than that of the terrestrial CDMA system, the disadvantage of the ring structure is pointed out and an improved multi-layer structure is proposed in which two adjacent terrestrial layers are seperated by several HAPS layers. The uplink capacity formula for the HAPS-terrestrial CDMA system is deduced and the capacity of the ring structure and that of the multi-layer structure are compared. Numerical results show that the uplink capacity of the HAPS system and that of the terrestrial system of the multi-layer structure increase to 111.9 and 110.2 respectively for a 10-tier system, while the uplink capacity of HAPS system and that of the terrestrial system of the ring structure are only 97.4 and 97.6 under the same condition.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2009年第5期788-792,共5页
Journal of Xidian University
基金
高等学校学科创新引智计划资助(B08038)
国家部委预研项目资助(410010208)
中国博士后科学基金资助(20070411119)
关键词
高空平台
容量
干扰
HAPS
capacity
interference