Abstract: In traditional reverse ray-tracing and predicting model, the order of reflection and diffraction is two or less. In this paper, a new 3D reverse ray-tracing algorithm for accurate field strength prediction is proposed, particularly suitable for urban scenarios. The orders of reflection and diffraction are arbitrary. Virtual source tree is created by directing search, and after that all valid paths from transmitter to receiver can be found quickly by inversing search. The effects of order of reflection and diffraction on predicting precision and complexity are also analyzed. Numerical results of the simulation show that this algorithm has higher accuracy and efficiency, which is quite useful for the design and optimization of wireless network.
radio wave propagation,