An Analysis of Scheduling and Feedback for Multiuser MIMO Systems

In this paper, for multiuser MIMO system, we consider a suboptimal scheduling scheme that allocates the channel to the user whose channel matrix has the maximal Frobenius norm and also we derive a tight expression of system capacity for it. Furthermore, exploiting this Frobenius norm, we propose a threshold based limited feedback scheme and give a theoretical analysis between the capacity and threshold value. Simulation shows the proposed schemes can achieve tradeoffs among complexity, feedback load, and capacity enhancement with the proper threshold value, which can be obtained by our analytical approximations.