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In mobile communication systems, such as LTE and LTE-Advanced, the adaptive modulation and coding (AMC) scheme is employed to achieve higher peak- and cell-throughputs. The scheme improves the throughputs by selecting an optimum Modulation and Coding rate Set (MCS), according to a radio channel condition. The scheme usually employs channel quality indicator (CQI) to feedback an index of MCS, with which the maximum throughput is expected at a receiver side in frequency division duplex (FDD) systems. Recently, cooperative multi-point transmission technologies (CoMP), such as cooperative MIMO, are receiving a considerable attention due to their potential cell-edge throughput improvement. In the application of AMC scheme with CQI feedback to cooperative MIMO, the CQI generation scheme designed for non-cooperative MIMO scheme may not obtain the optimum CQI value since the transmission signals from adjacent BSs are regarded as interference signals. The CQI feedback scheme needs to be enhanced so that transmission signals from adjacent BSs in cooperative MIMO are regarded as desired signals. This paper investigates a CQI generation scheme based on MMI for cooperative MIMO with AMC in frequency-selective channels, and evaluates its throughput performance.
Date of Conference: Oct. 29 2012-Nov. 2 2012