A Simulation Study of the Downlink Capacity of High Speed Wideband MIMO Cellular Systems

This paper investigates the downlink capacity of wideband high speed MIMO cellular networks for urban spatially correlated channels. Simulation results are presented illustrating the impact on the capacity of different channel models, including the 3GPP SCM model, the number of transmit/receive antennas and their spacing, and the available channel state information at the transmitter (CSIT). The results obtained with accurate modeling of the cellular network and propagation channel show that, similarly to point-to-point links, there is a linear capacity increase as a function of the number of degrees of freedom. The results also suggest that antenna spacing parameters have different effects depending on the mobile location in a cell and that user CSIT helps to improve the capacity when there is more transmit antennas than receive antennas but interference covariance information has little influence on the performances.