Reduced-Complexity Receivers for the Downlink of a Multicell CDMA System with Multiple Antennas

In this paper, we address the use of a novel low-complexity receiver, namely, a reduced-complexity hybrid receiver (HR) for the downlink of a multicell CDMA system with a transmit delay diversity transmission scheme. This receiver is designed by combining the merits of the decorrelating receiver (DR) and the conventional receiver (CR). Unlike most multiuser receivers, the reduced-complexity HR operates with the same information as CR. For a target performance metric (e.g. bit error probability (BEP) = 10¿2), the reduced-complexity HR significantly outperforms CR, DR, average minimum mean square error (MMSE) receiver, signal to noise ratio (SINR) maximizing (max-SINR) receiver, and reduced-complexity MMSE receiver with estimated channel information.