Evaluation of 60 GHz MIMO Channel Capacity in the Conference Room STA-STA Scenario

The 2×2 MIMO channel capacity is studied for millimeter wave radio propagation between two stations (STA-STA) on a table in a conference room. It is focused on whether a small antenna spacing enables a high MIMO channel capacity or not. The effect of reflection is also investigated on the MIMO channel capacity. For reflection, both two cases are considered: the reflection without scattering (where there are only deterministic central rays) and the reflection with scattering (where there are stochastic pre-cursor and post-cursor rays as well). The dimension of the conference room and other most channel parameters are employed, as suggested in the IEEE802.11ad 60 GHz channel model. It is shown from the simulation results that the scattering of such power as suggested in IEEE802.11ad 60 GHz channel model does not have significant effect on the MIMO channel capacity. The capacity is shown to depend on the multiple antenna orientation and the orientation of reflectors (that is, whether the reflector is either wall or ceiling). It is found that there is a locally optimal value in the region of small antenna spacings to maximize the MIMO channel capacity over that region.