The massive multiple-input multiple-output (MIMO) technology considerably enhances the
spectral efficiency of a wireless communication system. However, it suffers from substantial …

Massive multiple-input multiple-output systems deploying a large number of antennas at the
base station considerably increase the spectrum efficiency by serving multiple users …

Unlike the time-division duplexing systems, the downlink (DL) and uplink (UL) channels are
not reciprocal in the case of frequency-division duplexing (FDD). However, some long-term …

For frequency-division duplexing (FDD) massive multiple-input multiple-output (MIMO)
systems, it is challenging for the base station (BS) to acquire downlink channel state …

We propose a channel state information acquisition mechanism to reduce the training
overhead in frequency-division duplexing (FDD) massive multiple-input multiple-output …

Channel state information (CSI) at the base station (BS) is required to fully exploit the
advantages of massive MIMO. However, due to massive BS antennas, the estimation and …

We propose a novel method for massive multiple-input multiple-output (massive MIMO) in
frequency division duplexing (FDD) systems. Due to the large frequency separation between …

Time-division duplex (TDD)-based massive MIMO systems rely on the reciprocity of the
wireless propagation channels when calculating the downlink precoders based on uplink …

Accurate channel tracking with a small pilot overhead is vital for real-time massive multiple-
input and multiple-output (MIMO) communication over a dynamic channel. Recently …

Transmitter channel state information (CSIT) is indispensable for the spectral efficiency
gains offered by massive multiple-input multiple-output (MIMO) systems. In a frequency …