Results 71 to 80 of about 1,408 (177)

Photonic Hybrid Precoding for Millimeter Wave RoF Systems

open access: yesCoRR, 2017
Large propagation path loss and limited scattering of millimeter wave (mmwave) channels create new challenges for physical layer signal processing. Hence, in this article, we propose a photonic hybrid precoding model for mmwave radio-over-fiber systems that overcomes hardware constraints on radio frequency precoding.
openaire   +2 more sources

Hybrid centralized-distributed precoding in fronthaul-constrained CF-mMIMO systems [PDF]

open access: yes
We investigate a fronthaul-limited cell-free massive multiple-input multiple-output (CF-mMIMO) system and propose a hybrid centralized-distributed precoding strategy that dynamically adapts to varying fronthaul and spectral efficiency (SE) requirements ...
Cotton, Simon   +12 more
core   +1 more source

Hybrid MU-MIMO Precoding Based on K-Means User Clustering

open access: yes, 2019
Multi-User (MU) Multiple-Input-Multiple-Output (MIMO) systems have been extensively investigated over the last few years from both theoretical and practical perspectives.
Andrei-Alexandru Enescu   +2 more
core   +1 more source

Hybrid Analog and Digital Precoding Design in Multiuser MIMO Systems

open access: yes, 2017
In this paper, we proposed the hybrid precoding and hybrid decoding systems of multi-user multi-input multi-output (MU-MIMO) over the millimeter-wave band to improve the system\ue2s spectrum efficiency. Consider that the base station and user equipments (
Chang, Hsiao-tzu
core  

Over-Sampling Codebook-Based Hybrid Minimum Sum-Mean-Square-Error Precoding for Millimeter-Wave 3D-MIMO

open access: yes, 2018
: Hybrid precoding design is challenging for millimeter-wave (mmWave) massive MIMO. Most prior hybrid precoding schemes are designed to maximize the sum spectral efficiency (SSE), while seldom investigate the bit-error-rate (BER). Therefore, this letter
Gao, Zhen   +3 more
core   +1 more source

Hybrid Precoding and Combining Design for Wideband Millimeter Wave Systems

open access: yes, 2019
In this thesis, we focus on the wideband millimeter-wave(Mmwave) systems and propose a hybrid precoding and combining design. In this case that large-scale antenna array equipped at both the transmitter and receiver, the conventional fully-digital ...
Yang, Chi-Sheng
core  

Hybrid Analog-Digital Precoding Revisited Under Realistic RF Modeling [PDF]

open access: yes, 2016
In this letter, we revisit hybrid analog-digital precoding systems with emphasis on the modeling of their radio-frequency (RF) losses, to realistically evaluate their benefits in 5G system implementations.
Rulikowski, P   +3 more
core  

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