Multiuser diversity is used to select users for high-performance information transmission at the basestation based on the feedback information from all candidate UEs. When the closed-loop multiple antenna system uses multiuser diversity, the feedback load for both methods should be well balanced. While the close-loop multiuser beamforming system requires high-rate feedback to control spatial interference among selected users, the multiuser diversity scheme requires relatively small feedback load for each user[1].

  1. D. J. Love, R. W. Heath, Jr., V. K. N. Lau, D. Gesbert, B. D. Rao, and M. Andrews, “An overview of limited feedback in wireless communication systems ,” IEEE J. Select. Areas Commun., vol. 26, no. 8, pp. 1341–1365, Oct. 2008