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When MIMO techniques are used in a cellular system, the interference environment can become quite complicated. In this paper, we evaluate the impact of co-channel MIMO interference on the performance of space-time block coding in the downlink of a cellular-like system. In particular, we derive closed-form expressions for the probability density functions of the resulting signal-to-interference ratio with and various MIMO modes used by the co-channel base stations. Simulation results verify the validity of the analysis.