Efficient ray-launching analysis for indoor propagation including multiple reflection effect inside walls

This paper proposes an efficient modification of 2D ray-launching method, by including multiple reflection effect inside wall for indoor environment. An efficient approximation is carried out to bundle or collect the internal multiple reflected rays into the primary one. This approximation is called collective ray approach. We here focus on the derivation of the approximate solution for H (or Vertical) polarized incident case. Resultantly, it is confirmed from the detailed considerations that the present collective ray solutions can be confidently utilized in particular when the internal reflections strongly contribute to the propagation characteristic of the considered indoor environment.