面向物联网虚拟仿真的无线信号衰减计算方法

Calculating method for wireless signal attenuation in virtual laboratory of IoT

为了满足物联网虚拟仿真实验系统对Wi-Fi信号衰减的计算实时性、仿真准确性的需要,对D-W模型进行改进。对LOS与NLOS传播条件设计不同的衰减参数,以体现两种传播条件下信号衰减规律的差异;设计基于冗余信息的主路径搜索方法,避免多次建立房屋布局信息数据结构,并对备选路径的穿墙次数与偏转次数施加约束,优化搜索过程。实验结果表明,改进后的无线信号衰减计算方法提高了计算效率和计算准确性,满足了虚拟仿真实验的要求。

A modified calculating method for wireless signal attenuation in smart home environment based on the D-W model is introduced,to achieve desired accuracy and real-time property of signal strength prediction in virtual laboratory of IoT. Different attenuation parameters are given in LOS and NLOS cases to reflect the difference of propagation characteristic under different propagation conditions. Search method for dominant propagation path based on redundant information is designed,to avoid repeated establishing data structures of house information,and to constrain the number of times of wall-crossing and deflection of alternative paths and optimize the search process. The experimental results show that the modified calculating method for wireless signal attenuation improves the computing efficiency and accuracy,which meets the requirements of virtual simulation experimental system.