A method of electromagnetic parameters selection for ray-tracing channel simulation

In order to meet the ever-increasing requirements on high-precision channel modeling for future wireless communications, a method to select the electromagnetic parameters for ray-tracing channel simulation has been proposed, which addresses the challenging practical issue in ray-tracing channel simulation, namely, how to accurately determinate the environmental electromagnetic parameters. In the proposed method, a local radio environment map is firstly constructed with the measured radio propagation data in a small part of the whole simulation area. Then, based on the perceptual hash algorithm, the measured radio environment map is quickly compared against the ray-tracing simulated radio environment map. By adjusting the electromagnetic parameters in the simulation environment, the simulated results get close to the measurement results. For reflective surfaces composed of multiple types of materials, a rasterization method is further proposed to improve the accuracy of channel prediction. The proposed method has been employed to obtain environmental electromagnetic parameters and perform ray-tracing simulation verification. Laboratory test results show that the root mean square error of the received power is 2.7 dB when using the proposed method, which is smaller than that when using the traditional method with electromagnetic parameters querying from the material library. This method can be employed to avoid field measurement, especially for those hard-reaching environment, and can also be used to update (or supplement) the electromagnetic parameters queried from the material library.