Performance analysis of multiple antenna multi-user detection

We derive the diversity order of some multiple antenna multi-user cancellation and detection schemes. The common property of these detection methods is the usage of Alamouti and quasi-orthogonal space-time block codes. For detecting J users each having N transmit antennas, these schemes require only J antennas at the receiver. Our analysis shows that when having M receive antennas, the array-processing schemes provide the diversity order of N(M-J+1). In addition, our results prove that regardless of the number of users or receive antennas, when using maximum-likelihood decoding we get the full transmit and receive diversities, i.e. NM, similar to the no-interference scenario.