Correlation properties of MIMO radio channels for indoor scenarios

Multiple input- multiple output (MIMO) systems have the potential to achieve very high capacities, depending on the propagation environment. Capacity increases as signal correlation decreases. We present the measurements of a MIMO system under strong and weak line-of-sight conditions. The system capacity decreases as the separation from the transmitter increases; indeed the transmitter correlation increases as the separation increases. The receiver correlation is lower than the transmitter correlation under both propagation conditions. Also, there lies a benefit in using vertically polarized, vertically separated antennas.