J4 ›› 2014, Vol. 41 ›› Issue (2): 137-143.doi: 10.3969/j.issn.1001-2400.2014.02.023

• Original Articles • Previous Articles     Next Articles

Improved ray tracing prediction model in urban microcellular environments

LIU Zhongyu1;GUO Lixin1;ZHONG Zhimeng2;LU Xiaofeng2   

  1. (1. School of Physics and Optoelectronic Engineering, Xidian Univ., Xi'an  710071, China;
    2. Huawei Technologies Co., Ltd., Xi'an  710077, China)
  • Received:2012-11-29 Online:2014-04-20 Published:2014-05-30
  • Contact: LIU Zhongyu E-mail:liuzhongyu2003@163.com

Abstract:

The traditional ray tracing model usually has a disadvantage of low efficiency in creating a virtual source tree. In this paper, an improved quasi three-dimensional ray tracing model based on creating a new virtual source tree in which the relationship between neighbor nodes is a left-son-and-right-brother one is presented. In the model, a preprocessing technique for the reflection is used in order to accelerate the calculation of visible faces of the reflection source. Furthermore, the avoidance of unnecessary overlapping and intersection tests is achieved by using an improved polar sweep algorithm. Simulation results demonstrate that the proposed model is efficient and can provide the reliable theoretical basis for radio-wave propagation prediction and network planning in urban microcellular environments.

Key words: ray tracing, virtual source tree, urban microcellular

CLC Number: 

  • TN929.5