Influence of CSI Estimation Error and Feedback Delay on Throughput of Layered Partially Non-Orthogonal Block Diagonalization with Adaptive Interference Admission Control for BS Cooperative MU-MIMO

This paper investigates the influence of channel state information (CSI) error at the transmitter on the achievable throughput of our previously reported layered partially non-orthogonal block diagonalization (BD) precoding method with adaptive interference admission control (AIAC) for downlink multiuser (MU) multiple-input multiple-output (MIMO) transmission employing multiple base station (BS) cooperation. The impacts of the CSI estimation error at the user terminal and feedback delay are separately examined and they are compared to conventional approaches. Computer simulation results reveal that the layered BD with AIAC is more robust against CSI error at the transmitter than full BD with full CSI feedback, which implies the effectiveness of the layered BD with AIAC method in practice.