… we first describe the model of the CSI feedback problem and then introduce the basic principle
of the existing DL-based CSI feedback algorithms. Afterwards, we illustrate … System Model …

… Section II describes the system model and the scenario of CSI feedback. … SYSTEM MODEL
We consider a FDD massive MIMO system … The whole FDD system has Nc sub-carriers. The …

… , users have to estimate the downlink CSI first and then feed it back to the BS [2]. When the …
the BS is large, the overhead for CSI feedback in FDD massive MIMO systems could be huge. …

… This paper proposed a SampleDL method for downlink CSI feedback in FDD massive MIMO
systems. By combing compressive sampling with NNs, the proposed method outperforms …

… the downlink CSI feedback in FDD massive MIMO systems, … Moreover, to reduce the
requirement of a large training samples … downlink CSI feedback in FDD massive MIMO systems …

… We consider the massive MIMO system composed of a base station (BS) with Nt antennas
and a user equipment (UE) with Nr antennas. Following the spatially correlated physical …

… MIMO channel matrix also renders precise CSI feedback an extremely challenging
problem [2]. To alleviate the overhead, several downlink pilot design and uplink CSI feedback …

… SYSTEM MODEL In this section, we explain an FDD massive MIMO system model where
the BS has 𝑁 antennas and there are 𝐾 users each with a single receive antenna. For ease of …

… and downlink channels in the FDD systems, many researchers have … In a FDD massive
MIMO system, the partial channel … basis for DL-based limited feedback. The DL-based limited …

… duplexing (FDD) mode, the reciprocity-based downlink CSI is not … Thus, the downlink CSI
in FDD massive MIMO system should … CSI feedback method effectively reduces the feedback …