Training and Feedback Optimization for Multiuser MIMO Downlink
Training and Feedback Optimization for Multiuser MIMO Downlink
We consider a MIMO fading broadcast channel where the fading channel coefficients are constant over time-frequency blocks that span a coherent time x a coherence bandwidth. In closed-loop systems, channel state information at transmitter (CSIT) is acquired by the downlink training sent by the base station and an explicit feedback …