This paper investigates the mutual information of several 2 x 2 systems using orthogonal polarizations. Analytical approximations of the mutual information in equi-power allocation scenarios are derived and compared in both Rayleigh and Ricean fading conditions.
Oestges, C. (2006). Mutual information of non-Kronecker structured dual-polarized 2 x 2 channels. IEEE Transactions on Vehicular Technology, 55(1), 410-413. https://doi.org/10.1109/TVT.2005.858182 (Original work published 2006)