It is well known that the performance of frequency-division-duplex (FDD) massive MIMO
systems with iid channels is disappointing compared with that of time-division-duplex (TDD) …

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 …

This paper proposes a unified transmission strategy for multiuser time division duplex
(TDD)/frequency division duplex (FDD) massive multiple-input-multiple-output (MIMO) …

Channel reciprocity in time-division duplexing (TDD) massive multiple-input multiple-output
(MIMO) systems can be exploited to reduce the overhead required for the acquisition of …

Cell-free massive MIMO communications is an emerging network technology for 5G wireless
communications wherein distributed multi-antenna access points (APs) serve many users …

In this paper, we study the effect of channel aging on the uplink and downlink performance
of an FDD massive MIMO system, as the system dimension increases. Since the training …

This paper proposes a spatially common sparsity based adaptive channel estimation and
feedback scheme for frequency division duplex based massive multi-input multi-output …

Co-time co-frequency uplink and downlink (CCUD) transmission was considered
challenging in the cellular system due to the strong self-interference (SI) between the …

When there are a large number of antennas in massive MIMO systems, the transmitted
wideband signal will be sensitive to the physical propagation delay of electromagnetic …

Network-assisted full-duplex (NAFD) distributed massive multiple-input multiple-output
(MIMO) systems enable simultaneous uplink and downlink communications by dynamically …