Multiuser MIMO (MU-MIMO) is a MIMO technology which can utilize users as a virtual antenna element. There are two different approaches which are Downlink MU-MIMO and Uplink MU-MIMO schemes. For both downlink and uplink MU-MIMO schemes, signal processing for interference cancellation is required to achieve high throughput performance.
For example, if the zero-forcing algorithm is applied the received signal can be modeled as
where is the zeroforcing beamforming vector.