Calculating correlation coefficients in 3-D mix-diversity MIMO channel with Kronecker product

In order that we can freely investigate multi-input multi-output (MIMO) systems of any antenna diversity, a 3-D mix-diversity MIMO channel model is presented, and based on which a special algorithm, to which a Kronecker approximation method is applied, is raised to calculate correlation coefficients between any pair of sub-channels in various antenna diversity MIMO systems.