Hybrid beamforming architecture that combines analog beamforming and digital
beamforming has been widely accepted in the emerging millimeter-wave (mmWave) …

In this article, multiuser beam training based on hierarchical codebook for millimeter wave
massive multi-input multi-output is investigated, where the base station (BS) simultaneously …

In this paper, a simultaneous multiuser hierarchical beam training scheme for multiuser
mmWave massive MIMO systems is proposed based on the designed adaptive hierarchical …

We consider a 5G millimeter-wave (mmWave) massive MIMO system with subconnected
hybrid structure, where each transceiver unit (TXRU) is connected to a subarray at the …

This letter proposes a simultaneous beam training (BT) scheme for multiuser millimeter-
wave systems with subarray structures. To conduct parallel BT among user-groups and …

We investigate beam training and allocation for multiuser millimeter wave massive MIMO
systems. An orthogonal pilot-based beam training scheme is first developed to reduce the …

Aiming at the problem of high computational complexity due to a large number of antennas
deployed in mmWave massive multiple-input multiple-output (MIMO) communication …

Due to the inherent high path-loss of millimeterwave signals, beamforming combined with
massive MIMO is crucial for increasing coverage range, whereby beam alignment via beam …

Massive MIMO systems are known to be a very promising solution for future 5G systems. The
attractiveness of using such a system for millimeter Wave (mmWave) transmissions comes …

A novel approach is proposed to improve channel estimation accuracy in hierarchical
codebook-based beam search for millimeter-wave (mmWave) massive multiple-input and …