Efficient downlink cooperative multi-cell transmission for MU-MIMO system

Cooperative communication technology has been widely studied in recent years due to providing higher resource utilization and more reliable communication. In this work, we consider a downlink multi-user multi-input-multi-output (MU-MIMO) system with cooperative multi-cell transmission. Assuming that the channel state information are available at cell and user, we propose a simple user scheduling algorithm which can achieve the multi-user diversity gain and a power allocation scheme that subject to the total transmission power constrains so that it can more efficiently utilize the system resource and suppress the co-channel interference for the target user equipment. Theoretical analysis and Monte Carlo simulation results show that the transmission sum-rate of the proposed scheme is higher than the traditional single-cell or multi-cell transmission for single user. Additionally, performance of the edge user will also be improved when using the proposed scheme.