中文说明：
仿真源码包括了多层异构蜂窝网络中基于齐次泊松点过程（HPPP）的建模方法，一篇介绍该模型的12年发表在IEEE trans的论文。以及传统六边形建模方法和信道增益矩阵的计算。
English Description：
The simulation source code includes the modeling method based on homogeneous Poisson point process (hppp) in multi-layer heterogeneous cellular networks. A 12 year paper on this model was published in IEEE Trans. As well as the traditional hexagon modeling method and channel gain matrix calculation.