In order to realize the advantages of the massive MIMO systems, the channel state
information must be obtained at the base station (BS). However, it is a challenging task in
the frequency division duplexing (FDD) systems due to the overwhelming overhead of
downlink channel pilots and uplink channel feedback. In this paper, we consider the multi-
user massive MIMO system and apply joint sparsity-based technique to reduce the
overhead. Due to the shared scatterers in the physical propagation environment, the user …