A double-bounce channel model for multi-polarized MIMO systems

Measurement campaigns have indicated that propagation paths with multiple reflections are important in indoor and picocell environments. It has also been found that is is difficult to match both angles and delays using single-bounce models. In this paper, a double-bounce Multi-Input Multi-Output (MIMO) channel model is proposed that also includes polarization. The scattering geometry based channel model is extended to two scattering instants per path, i.e. double-bounce, in order to better model indoor and picocell environments. Formulas for determining the required positions of the scatterers in order to yield a desired angular spread are derived under the double-bounce assumption. Furthermore, a physics based full field treatment of the polarization properties of the antennas is possible since the scattering geometry based models keep the same physical layout as the experiments. The validity of the model is examined by comparing simulations of the channel capacity to measurements taken with a MIMO channel probing equipment at the campus of Brigham Young University.