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This paper addresses advanced Radio Resource Management (RRM) algorithms for Multiple-Input Multiple-Output (MIMO) transmission schemes in downlink OFDMA systems. The analysis covers the main RRM mechanisms including MIMO rank adaptation and time-frequency packet scheduling. The UTRAN Long Term Evolution (LTE) system is used as case study. System-level performance analysis is presented for 2x2 and 4x4 spatial-multiplexing, single-user MIMO transmission schemes in typical Macro- and Micro-Cell scenarios including the effects of limited and imperfect CQI feedback from the terminals.
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