变电站场景环境解析型无线信道路径损耗融合预测方法

      Fusion prediction method of wireless channel path loss based on environmental analysis of substation scenario

      • 摘要: 路径损耗是无线信号在传播过程中由于距离、障碍物等因素导致的信号功率衰减,这种衰减对无线通信系统的设计和性能具有重要影响。然而,在变电站等复杂电磁环境中,密集部署的电力设备导致多径效应显著,使得传统模型难以准确预测路径损耗。为了提高变电站等复杂环境下路径损耗的预测精度,提出了一种适用于变电站场景的环境解析型融合预测方法。首先基于实际场景中散射体特征建立规则与不规则散射体模型。其次,基于环境中规则散射体分布建立站内三维仿真环境,利用射线追踪(ray tracing, RT)技术初步计算路径损耗,并基于实测路损计算误差。再次,联合环境中不规则散射体的拐角和遮挡深度等环境特征,建立基于径向基函数神经网络(radial basis function neural network, RBFNN)的路损预测模型。最后,利用变电站内2.4 GHz实测数据对模型性能进行验证。仿真结果表明,本文方法相比于传统的信道建模方法,均方根误差(root mean square error, RMSE)降低了5.28 dB左右,有效提高了变电站等复杂环境下无线信道路径损耗的预测精度。

         

        Abstract: Path loss refers to the attenuation of signal power during wireless signal propagation caused by factors such as distance and obstacles, and it holds significant importance for wireless communication systems. However, in complex electromagnetic environments such as substations, densely deployed power equipment leads to significant multipath effects, making traditional channel modeling methods inadequate for accurate signal propagation characterization. To enhance the prediction accuracy of path loss in complex environments such as substations, an environment-analytical fusion prediction method is proposed. First, based on the characteristics of scatterers in practical scenarios, we establish descriptive models for both regular and irregular scatterers. Next, a three-dimensional simulation environment is created within the station using the distribution of regular scatterers. Ray tracing (RT) technology is employed to perform preliminary calculations of path loss. The error of path loss by RT is calculated based on measured path loss data. Then, integrating environmental features such as corner angles and occlusion depths of irregular scatterers within the environment, a path loss prediction model based on radial basis function (RBF) neural networks is established. Finally, the performance of proposed model is validated using measurement data at 2.4 GHz in the substation. Simulation results demonstrate that the root mean square error (RMSE) is reduced by approximately 5.28 dB, which effectively improves the prediction accuracy of wireless channel path loss in complex environments.

         

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