论文标题
关于动态环境的动态射线追踪和预期通道预测
On Dynamic Ray Tracing and Anticipative Channel Prediction for Dynamic Environments
论文作者
论文摘要
射线追踪算法可以模拟在存在建筑物，物体或车辆等几何障碍物（例如数字环境数据库的可用性和高性能计算平台）（例如多层计算机和云计算服务）的越来越多的几何障碍物（例如建筑物，物体或车辆）的存在下，它们可以模拟多径无线电传播。当物体或车辆移动时，工业或车辆环境就是这种情况，通常需要进行多个连续的环境表示（“快照”）和多个射线追踪运行，这需要大量的人为努力和大量的计算资源。最近，已经提出了动态射线追踪方法（DRT）方法，以通过分析外推公式在当前多径几何形状基础上的给定时间段内预测多径演化，假设移动对象的恒定速度和/或加速度。这是在没有重新运行环境“快照”的完整射线跟踪的情况下完成的，因此可以节省大量计算时间。当DRT嵌入到移动无线电系统中并实时使用时，可以提前（或预期）现场预测为有趣的应用程序打开道路。在目前的工作中，提出了一个全3D DRT算法，该算法允许对多种反射，边缘衍射和弥散散射，对于一般情况下，移动对象可以翻译和旋转。为了进行验证，该模型首先应用于某些理想情况，然后应用于现实的情况下，将结果与传统的射线追踪模拟和文献中可用的测量结果进行了比较。
Ray tracing algorithms, that can simulate multipath radio propagation in presence of geometric obstacles such as buildings, objects or vehicles, are becoming quite popular, due to the increasing availability of digital environment databases and high-performance computation platforms, such as multicore computers and cloud computing services. When objects or vehicles are moving, which is the case of industrial or vehicular environments, multiple successive representations of the environment ("snapshots") and multiple ray tracing runs are often necessary, which require a great human effort and a great deal of computation resources. Recently, the Dynamic Ray Tracing (DRT) approach has been proposed to predict the multipath evolution within a given time lapse on the base of the current multipath geometry, assuming constant speeds and/or accelerations for moving objects, using analytical extrapolation formulas. This is done without re-running a full ray tracing for every "snapshot" of the environment, therefore with a great computation time saving. When DRT is embedded in a mobile radio system and used in real-time, ahead-of-time (or anticipative) field prediction is possible that opens the way to interesting applications. In the present work, a full-3D DRT algorithm is presented that allows to account for multiple reflections, edge diffraction and diffuse scattering for the general case where moving objects can translate and rotate. For the purpose of validation, the model is first applied to some ideal cases and then to realistic cases where results are compared with conventional ray tracing simulation and measurements available in the literature.
