Performance analysis of multiuser MIMO system based on zero forcing for moving targets

This paper provides performance analysis of multiuser multiple input multiple output (MIMO) downlink system based on zero forcing (ZF) assuming communication with moving targets. Under different conditions of antenna number, Doppler frequency, and channel estimation interval, performance of several simple methods which attempt to extend the ZF area based on channel prediction using linear extrapolation is investigated through computer experiments adopting Jakes' model. First, two point ZF method and ZF with derivative constraint are compared under idealistic conditions. Next, time variant weight is applied to multiuser MIMO ZF problem, and its characteristics are evaluated with respect to other approaches. The results show that the advantage of those methods depends on the system and/or channel conditions.