Rate Control for Zero-Forcing Beamforming Multiuser MIMO Systems with QR-Decomposition MLD Receiver

A rate control scheme is described for zero-forcing beamforming (ZFBF) multiuser multiple-input and multiple-output (MU-MIMO) systems with a QR-decomposition maximum likelihood detector (MLD) at the receiver. For selected users, a modulation-and- coding set is selected for each substream by estimating the per-substream post-MLD signal-to-interference- plus-noise ratio. Iterative modified QR-decomposition MLD is employed at the receiver to achieve the throughput expected from the transmitter. The simulation results demonstrated that the proposed rate-control scheme achieved the target packet error rate while increasing the throughout for ZFBF-MU- MIMO systems as the number of user candidates increases.