  A model to estimate the asymptotic isotropic mutual information of a
multiantenna channel is considered. Using a block-based dynamics and the angle
diversity of the system, we derived what may be thought of as the
operator-valued version of the Kronecker correlation model. This model turns
out to be more flexible than the classical version, as it incorporates both an
arbitrary channel correlation and the correlation produced by the asymptotic
antenna patterns. A method to calculate the asymptotic isotropic mutual
information of the system is established using operator-valued free probability
tools. A particular case is considered in which we start with explicit Cauchy
transforms and all the computations are done with diagonal matrices, which make
the implementation simpler and more efficient.
