Receiver Performance-Complexity Tradeoff in LTE MU-MIMO Transmission
Multi-User Multiple-Input and Multiple-Output (MU-MIMO) transmission scheme provides potential gain in terms of system capacity in spatial correlated scenarios and is considered as one of the key technologies in Long Term Evolution (LTE) systems. The goal of this paper is to gain insight into MU-MIMO detection concepts and their implementation aspects. Various receiver architectures are investigated and their performance is assessed through an advanced link-level simulator. The motivation to study the MU-MIMO detectors rises from the weakness of the co-channel interference-unaware single user detector, the conventional detector for single user MIMO transmission. The most essential problem of these conventional single user detectors in MU-MIMO is the failing to detect signals under the residual interference caused by co-scheduled user, which reduces the performance of the detector.