Abstract
This paper considers the use of 4 × 4 multiple-input multiple-output (MIMO) antenna arrays for improving the mutual information with and without polarization diversity. The authors focus on the benefits offered by a combination of spatial and polarization diversity techniques. In this paper, are taken in consideration the cases where the channel state information (CSI) is known or unknown to transmitter for low signal to noise ratios (SNR) in the presence of low and high spatial correlation. The cumulative distribution function (CDF) of the mutual information is studied. We also examine the impact of cross polarization discrimination (XPD) on the mean mutual information of MIMO systems.
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