Extending conventional LTE systems with small cells offer new horizon in mobile communications to provide better coverage and enhance capacity. OFDM-based air interfaces allow sharing this capacity in a very flexible way. MIMO transmitters and receivers introduce significant increase in capacity in exchange of very sophisticated signal processing algorithms. In this paper we present a new system model for OFDM-based LTE small cell systems which allows computing the overall system capacity when mobile MIMO users move along edges of a graph, e. g. roads.
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