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Significant throughput gains can be achieved in a Multi-User MIMO (MU-MIMO) wireless system by exploiting the combination of multi-user scheduling and multi-user diversity. Open-Loop MU-MIMO (OL-MU-MIMO) is a codebook based precoding technique where precoders are fixed a priori at the Base Station (BS) in a known fashion and the user needs to feedback which precoding vector is to be chosen referred to as Precoding Vector Index (PVI) or stream indicator. This scheme feedbacks the Channel Quality Indicator (CQI) which is used by the BS for allocation of Modulation and Coding Scheme (MCS) to the scheduled users.
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