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MIMO systems based on dual-polarized antennas at transmitter and receiver constitute an interesting alternative to conventional MlMO configurations. This paper analyzes the ergodic capacity of such systems in urban micro- and pico-cellular environments. The MIMO channel is modeled by using a site-specific ray-tracing propagation tool. This technique permits to analyze the impact of environmental parameters, like antennas location and orientation, on the system performance. Ergodic capacity estimations in a specific urban environment are presented.