Embedded PSO/PIU based cooperative transmit beamforming for multiuser MIMO systems

In this paper, we proposed an embedded particle swarm optimization/parallel iterative update (PSO/PIU) scheme to concurrently search users' cooperative transmit beamformers (CBTFs) for the uplink of multiuser MIMO systems. This proposed scheme is a modified PSO approach by embedding the PIU mechanism into the conventional PSO. With the help of the PIU mechanism, the interference can be effectively mitigated in each iteration. As a result, the PSO's searching solution ability can be improved, which leads the CTBFs to be iteratively updated to reach or approach to the global solution. Finally, simulation results show that the proposed scheme outperforms existing works.