This paper expands an analytical formulation of maximal ratio transmission (MRT) precoded massive multiple-input multiple-output (MIMO) systems. Evaluating performance on massive MIMO systems where both base station (BS) and user terminals (UTs) have array antennas could impose impractical computation complexity. The existing work derived the power distribution of inter-user interference (IUI) but that of the desired signal was treated as fixed. This paper enhances its modeling accuracy by deriving the latest. The consistency of the proposed model is confirmed by comparing it to the simulation results.

This letter adopts higher-order modulation scheme than 16QAM to our previously proposed semi-blind uplink interference suppression scheme for multicell multiuser massive MIMO systems. Our semi-blind approach is attained by the decision feedback channel estimation (DFCE) and the sample matrix inversion (SMI) spatial adaptive filtering. However, its efficiency depended on inter-cell interference (ICI), in particular for higher-order QAM. We propose to employ cell partitioning-based M-ary QAM to avoid ICI at the initial condition and verify overall spectral efficiency improvement.

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