Multi-polarized MIMO communications: channel model, mutual information and array

This paper considers the use of nr × nt dualpolarized arrays for improving the mutual information of MIMO communications. We first develop an elegant model of the multipolarized MIMO channel, which allows to account for spatial correlation and depolarization effects. The major advantage of the model lies in its analytical expression, whose parameters have a clear physical meaning. In a second part, we investigate the ergodic mutual information of multi-polarized schemes, and derive a condition upon which multi-polarized transmissions offer a higher capacity than equivalent uni-polarized schemes using the same number of antennas under the same overall array dimensions.