Outage capacity of OSTBCs over pico-cellular MIMO channels

We consider orthogonal space-time block coded transmission over the multiple cluster scattering MIMO channels, where the effective channel equals the product of n complex Gaussian matrices. The considered channel model is typical in modeling pico-cellular MIMO propagations. In this setting, we derived a closed-form approximation to the channel outage capacity. The result is valid for an arbitrary number of clusters n-1 of scatterers and an arbitrary antenna configuration. Numerical results show the usefulness of the proposed approximation in diverse scenarios.