Investigation on Distributed User Selection for Uplink Multicell Systems with MIMO

Considering a multicell environment, a distributed user selection scheme for uplink multiuser multiple-input multiple-output (MU-MIMO) system is proposed. In the proposed scheme, each user determines their own transmit beamforming vector based on the locally available channel state information (CSI), and informs the associated base station (BS) of the amount of inter-cell interference (ICI) affecting adjacent cells and the resulting beamforming vector. With the identical first-order statistic between the ICI from adjacent cells and the ICI that affects adjacent cells, a set of users can be selected, which the BS will simultaneously serve based on either the achievable sum rate maximization or proportional fairness achievement. Simulation results show that compared with prior distributed user-selection schemes, the proposed method provides a significant improvement in terms of achievable sum rates.