On the Capacity of Spatially Correlated MIMO Channels in a 60 GHz Indoor Environment

In this paper, we investigate the capacity of spatially correlated, multiple-input–multiple-output (MIMO) channels in a 60 GHz indoor environment. We first derive the correlation coefficients between two antenna elements as a function of the antenna spacing. Then, the standard deviation of the power azimuth spectrum (PAS) and the mean angle of arrival (AOA) are obtained for the truncated Laplacian model, which is appropriate for broadband 60 GHz indoor channels. The Triple Saleh-Valenzuela (TSV) model is considered as a typical for these channels. The capacity of correlated MIMO channels for 60 GHz indoor environments is investigated for two power allocation schemes, equal and water-filling. It is shown that the capacity is affected by the spatial correlation , which varies according to the antenna spacing , PAS standard deviation and mean AOA. Finally, it is determined that when channel state information (CSI) is available at the transmitter, the correlated MIMO channel capacity with water-filling power allocation is greater than the capacity achieved with equal power allocation.