Understanding Geometrically based Multiple Bounce Channel Models

This paper looks into various ways of extending a geometrically based single bounce channel model into a multiple bounce one, the main motivation being to overcome some of the limitations of the former models. Three different strategies to implement the way rays are bounced are described and compared, a comparison between diffuse scattering and specular reflection being also investigated; as expected, specular reflection leads to higher power values for the arriving rays, with impact on the delay spread. Some initial results are presented; it seems that more than 2 bounces only enlarges the delay spread. (4 pages)