Determination of Image Sources to Predict LOS Propagation in an Urban Microcell

In this paper we describe the generalized method for the prediction of the LOS propagating characteristics in an urban Microcell using the ray tracing technique. The conventional ray tracing techniques suffer from finite number of rays and can’t ensure the exact solution. But the image methods allow us to treat the infinite number of rays and thus obtain the accurate solution. Also there is the benefit of computation times and capacity. To take into account the infinite number of paths the technique of the numbering scheme of image antennas was presented by using the rectangular pulse. The proposed technique has resolved the restriction on the finite number of paths encountered in conventional ray launching methods. With application of the numbering method on the canyon model, the received power and RMS delay spread are computed and their accuracy dependence on the employed number of paths are compared and discussed at the frequencies of both 900MHz and 2.4GHz.