Throughput performance of layered partially non-orthogonal block diagonalization with adaptive interference admission control in distributed antenna system

Recent academic studies have shown that the distributed antenna system (DAS) provides potential advantages such as reduced transmission power and increased system throughput. This paper considers a multiple base station (BS)-cooperative DAS downlink. We apply our previously reported multiuser multiple-input multiple-output (MIMO) precoding scheme called layered partially non-orthogonal block diagonalization (BD) with adaptive interference admission control (AIAC). Layered BD with AIAC is applicable when some of the instantaneous channel state information (CSI) feedback between the user equipment and the respective transmitter antennas are missing if the path loss between the user equipment and the transmitter antennas exceeds a predetermined threshold. Experimental results show that the combination of a multi-BS-cooperative DAS and layered BD with AIAC increases the system throughput of BS-cooperative-multiuser MIMO with partial CSI feedback. In particular, the worst user throughput is significantly increased with DAS. This is because geographically distributed antennas help to reduce the dead spots and improve user fairness.