Recent works have shown the potential performance
MIMO systems based on dual-polarized antennas at transmitter
and receiver. These works assume Rayleigh or Ricean channel
models. In this paper we provide closed-form expressions of the
ergodic capacity for arbitrary channels, being the Rayleigh and
Ricean two particular cases. These expressions are function of the
specific physical characteristics of the propagation environment
and antennas, therefore they directly connect the ergodic capacity
with the physical characteristics of the MIMO channel
