基于非泊松点过程的异构蜂窝网络能效优化  

Energy efficiency optimization of heterogeneous cellular networks based on non⁃Poisson point process

作　　者：陈永红[1] 郭莉莉[1,2] 张士兵[2] 王敬时[2] CHEN Yonghong;GUO Lili;ZHANG Shibing;WANG Jingshi(Xinglin College,Nantong University,Nantong 226000,China;School of Information Science and Technology,Nantong University,Nantong 226019,China)

机构地区：[1]南通大学杏林学院,江苏南通226000 [2]南通大学信息科学技术学院,江苏南通226019

出　　处：《南京邮电大学学报（自然科学版）》2021年第3期14-22,共9页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家自然科学基金(61871241);南通市科技计划(JC2019117)资助项目。

摘　　要：泊松点过程(Poisson Point Process,PPP)为异构蜂窝网络(Heterogeneous Cellular Networks,HetNets)的分析提供易于处理的结果,因此在无线网络建模和性能分析中得到了广泛的应用。然而,它不能准确反映实际基站的空间分布特征。考虑到宏基站(Macro Base Station,MBS)的分布具有排斥性,文中采用Matérn硬核点过程(Matérn Hard⁃Core Point Process,MHCPP)对MBS的部署进行建模,采用一种简单的近似方法分析了两层MHCPP⁃PPP网络的信噪比分布,推导了异构蜂窝网络的覆盖概率、平均可达速率和能量效率,提出了一种优化算法提高异构蜂窝网络的能量效率。最后,采用单输入单输出(SISO)、空分多址(SDMA)、单用户波束形成(SUBF)三种传输技术对系统的性能进行了仿真和分析。仿真结果表明,通过文中提出的算法得到最优的PBS发射功率可以有效地提高系统的能量效率。此外,两层MHCPP⁃PPP异构蜂窝网络的能量效率高于两层PPP⁃PPP网络。The Poisson point process(PPP)provides tractable results for the analysis of heterogeneous cellular networks(HetNets),so it has been widely used in wireless network modeling and performance analysis.However,it cannot accurately reflect the spatial distribution characteristics of the actual base station.Considering that the distribution of macro base station(MBS)is exclusive,the Matérn hard⁃core point process(MHCPP)is used to model the deployment of MBS.Firstly,a simple approximate method is used to study the signal to interference(SIR)ratio distribution in the two⁃tier MHCPP⁃PPP network,and the coverage probability,the average achievable rate and the energy efficiency in the heterogeneous cellular network are derived.Then,an optimization algorithm is proposed to improve the energy efficiency of heterogeneous cellular networks.Finally,the system performance is simulated and analyzed by using SISO,SDMA and SUBF technologies.Simulation results show that the algorithm can obtain the optimal PBS transmission power,effectively improving the energy efficiency of the system.In addition,the energy efficiency of the two⁃tier MHCPP⁃PPP heterogeneous cellular network is higher than that of the two⁃tier PPP⁃PPP HetNets.

关 键 词：能量效率 异构蜂窝网络 覆盖概率 平均可达速率 随机几何 

分 类 号：TN925[电子电信—通信与信息系统]