Low-Complexity Multiuser MIMO Downlink System Based on a Small-Sized CQI Quantizer

It is known that the conventional semi-orthogonal user selection based on a greedy algorithm cannot provide a globally optimal solution due to its semi-orthogonal property. To find a more optimal user set and prevent the waste of the feedback resource at the base station, the authors present a multiuser multiple-input multiple-output system using a Random BeamForming (RBF) scheme, in which one unitary matrix is used. To reduce feedback overhead for Channel Quality Information (CQI), they propose an efficient CQI quantizer based on a closed-form expression of expected SINR for selected users.

Provided by: EURASIP Topic: Mobility Date Added: Feb 2012 Format: PDF

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