Abstract
The supportive number of users achieving the maximum sum rate is studied in uplink massive MIMO systems for zero-forcing (ZF) and maximum-ratio combining (MRC). We obtain the lower bound of the achievable rate of each user for ZF and MRC receivers with any finite number of base station (BS) antennas, respectively. By this theoretical result, this paper will focus on the supportive number of users which was constrained with the minimum achievable rate. Through analyzing the optimal problem of maximizing the overall sum rate, we obtain the expression of optimal number of users and present the user scheduling algorithm for achieving the maximized sum rate. The numerical results show that the massive MIMO systems can improve the supportive number of users, and ZF receivers can support more number of users than MRC under the same condition.
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