20 citations · 20 across the 4 of their papers we have counts for
7 papers · 1 filter
Analog-Only Beamforming for Near-Field Multiuser MIMO Communications
Ying Wang, Chenhao Qi
For the existing near-field multiuser communications based on hybrid beamforming (HBF) architectures, high-quality effective channel estimation is required to obtain the channel st…
Beam Switching Based Beam Design for High-Speed Train mmWave Communications
Jingjia Huang, Chenhao Qi, Octavia A. Dobre +1
For high-speed train (HST) millimeter wave (mmWave) communications, the use of narrow beams with small beam coverage needs frequent beam switching, while wider beams with small bea…
Hybrid Beamforming Design for Covert mmWave MIMO with Finite-Resolution DACs
Wei Ci, Chenhao Qi, Xiaohu You
We investigate hybrid beamforming design for covert millimeter wave multiple-input multiple-output systems with finite-resolution digital-to-analog converters (DACs), which impose…
Near-Field Multiuser Communications based on Sparse Arrays
Kangjian Chen, Chenhao Qi, Geoffrey Ye Li +1
This paper considers near-field multiuser communications based on sparse arrays (SAs). First, for the uniform SAs (USAs), we analyze the beam gains of channel steering vectors, whi…
Triple-Refined Hybrid-Field Beam Training for mmWave Extremely Large-Scale MIMO
Kangjian Chen, Chenhao Qi, Octavia A. Dobre +1
This paper investigates beam training for extremely large-scale multiple-input multiple-output systems. By considering both the near field and far field, a triple-refined hybrid-fi…
Hybrid Precoding for Mixture Use of Phase Shifters and Switches in mmWave Massive MIMO
Chenhao Qi, Qiang Liu, Xianghao Yu +1
A variable-phase-shifter (VPS) architecture with hybrid precoding for mixture use of phase shifters and switches, is proposed for millimeter wave massive multiple-input multiple-ou…