An Efficient User Scheduling Scheme for MU-MIMO Systems with Limited Feedback

On the MU-MIMO broadcast channel, Per-User Unitary and Rate Control (PU2RC) as a practical design is proposed for emerging cellular standards in 3GPP LTE. Unfortunately, when the number of users is small, the performance of PU2RC would be degraded with the increase of codebook size. In this paper, we propose an efficient user scheduling scheme to overcome this defect in PU2RC by enlargement of user scheduling space. The key feature of the proposed scheme is that at the BS each user is associated with at least one codebook vectors with the help of a predetermined threshold value. Simulation results show that the proposed scheme can be efficient to solute the problem of conventional scheme in PU2RC at the small number of users.