基于随机几何的认知异构网络的下行容量分析  

Downlink capacity analysis on cognitive heterogeneous networks via stochastic geometry

作　　者：张悦[1] 宋荣方[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2017年第2期46-50,106,共6页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家自然科学基金(61271234);东南大学移动通信国家重点实验室开放课题(2014D08)资助项目

摘　　要：由于在现有的异构蜂窝网系统中,宏蜂窝频谱在某些时间段或者某些区域的利用率是很低的,因此,基于认知无线电(CR)家庭蜂窝是一种很有前途的技术。文中利用随机几何工具研究了在完美信道感知的情况下认知异构网络的传输容量性能,分别推导了在多信道条件下和特定中断约束下宏蜂窝与家庭蜂窝的容量性能。推导过程中还考虑了宏蜂窝用户、家庭蜂窝用户与其基站距离的随机性,因此推导结果对系统拓扑结构的变化是健壮的。通过仿真结果,研究并分析了认知频谱共享方案中传输容量与家庭蜂窝半径及家庭基站功率的关系。In existing heterogeneous cellular network systems, the utilization of macrocellular spectrum in some time periods or areas is very lower,thus the femtocell based on the cognitive radio （CR） is a promising technology. This paper studies transmission capacity performance of cognitive heterogeneous networks with perfect channel sensing. The transmission capacity of the macrocell and the femtocell is derived using stochastic geometry. In the process of derivation,the random nature of the distance among the maerocellular user, the cellular user and their base station is considered, the result is robust to the variation of the system topology. Simulation results are studied and analyzed. The performance of the proposed scheme is evaluated by simulating the relation between the transmission capacity and the femtocell radius with power.

关 键 词：随机几何 中断约束 传输容量 认知无线电 频谱共享 

分 类 号：TN929.5[电子电信—通信与信息系统]