Capacity analysis of macro/microcellular CDMA with power ratio control and tilted antenna
Capacity analysis of macro/microcellular CDMA with power ratio control and tilted antenna
复制标题
具有功率比控制和倾斜天线的宏/微蜂窝CDMA容量分析
DOI：
10.1109/25.820696
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
K. Whang
中科院分区：
文献类型：
--
作者：
Dong Hee Kim;D. D. Lee;H. Kim;K. Whang
对于工作在相同频带的宏微蜂窝码分多址(CDMA)系统，反向链路容量是解析地获得的。重点研究了宏蜂窝基站(BS)与微蜂窝基站(BS)所需接收功率的比值以及微蜂窝天线的倾角，以增加系统容量。通过几何近似推导出闭合形式的微小区到宏小区的干扰，并在宏小区的划分区域上计算宏小区到微小区的干扰。通过定义最大化系统容量的最小干扰权衡因子来获得最佳倾角。结果表明，在宏微蜂窝环境下，功率比控制可以显著提高系统容量。此外，适当选择的天线倾斜角增加了更多的容量，使微小区用户能够节省发射功率。
The reverse link capacity is obtained analytically for macro/microcellular code-division multiple-access (CDMA) systems operating in the same frequency band. The focuses are on the ratio of required receive power of the macrocell base station (BS) to that of the microcell BS and the tilt angle of the microcell antenna to increase the system capacity. The microcell-to-macrocell interference is derived in closed form by geometric approximation, and the macrocell-to-microcell interference is calculated on the divided regions of macrocell. The optimal tilt angle is obtained by defining the minimum interference tradeoff factor that maximizes the system capacity. It is shown that the system capacity increases remarkably with power ratio control in macro/microcellular environments. Also, the properly chosen antenna tilt angle adds more capacity, and enables the microcell users to save on the transmit power.