Capacity and Power Allocation Scheme for Linear MIMO Beamforming with Imperfect Channel State Information

Perfect channel state information (CSI) is always assumed in work on multiple-input, multiple-output (MIMO) precoding theoretical analyze. In this paper, we investigate the effect of imperfect channel state information on the performance of MIMO broadcast channel (MIMO-BC). We show that even with moderate channel estimation error, the system performance degrade significantly. So, we propose a Frobenius norm based power allocation scheme to guarantee the user´s QoS. Simulation results show that this scheme enhances the user´s outage performance and reduces the sensitivity to the imperfect CSI.