Results 61 to 70 of about 1,722,156 (269)

Wideband Beamforming for Hybrid Massive MIMO Terahertz Communications

IEEE Journal on Selected Areas in Communications, 2021
The combination of large bandwidth at terahertz (THz) and the large number of antennas in massive MIMO results in the non-negligible spatial wideband effect in time domain or the corresponding beam squint issue in frequency domain, which will cause severe performance degradation if not properly treated.
Feifei Gao, Bolei Wang, Chengwen Xing, Jianping An, Geoffrey Ye Li   +4 more
openaire   +3 more sources

Energy Efficiency and Asymptotic Performance Evaluation of Beamforming Structures in Doubly Massive MIMO mmWave Systems

, 2017
Future cellular systems based on the use of millimeter waves will heavily rely on the use of antenna arrays both at the transmitter and at the receiver.
Buzzi, Stefano, D'Andrea, Carmen
core   +1 more source

Dynamic Hybrid Beamforming Designs for ELAA Near-Field Communications [PDF]

IEEE Journal on Selected Areas in Communications
Extremely large-scale antenna array (ELAA) is a key candidate technology for the sixth generation (6G) mobile networks. Nevertheless, using substantial numbers of antennas to transmit high-frequency signals in ELAA systems significantly exacerbates the ...
Meng-Ting Liu, Ming Li, Rang Liu, Qian Liu   +3 more
semanticscholar   +1 more source

A Smart Magnetically Actuated Flip‐Disc Programmable Metasurface with Ultralow Power Consumption for Real‐Time Channel Control

Advanced Functional Materials, EarlyView.
The study proposes a 1‐bit programmable metasurface based on flip‐disc display, named flip‐disc metasurface (FD‐MTS). This new design enables ultralow energy consumption while maintaining coding patterns. It also exhibits high scalability and multifunctional flexibility.
Jiang Han Bao, Che Liu, Jia Cheng Li, Zhen Hao Fu, Yi Su Huang, Si Qi Huang, Lei Zhang, Jian Wei You, Tie Jun Cui   +8 more
wiley   +1 more source

Multiple-Beam Selection With Limited Feedback for Hybrid Beamforming in Massive MIMO Systems

IEEE Access, 2017
Hybrid multiple-input multiple-output (MIMO) systems have been thought as a promising technology in future 5G. Compared with conventional digital MIMO systems, such a structure is equipped with fewer RF chains, which would reduce the computational ...
Yuwei Ren, Yingmin Wang, Can Qi, Yinjun Liu   +3 more
doaj   +1 more source

Low complexity but near optimal hybrid beamforming design in tera‐hertz communication systems: principles and opportunities

IET Microwaves, Antennas & Propagation, 2023
Next generation communication systems go to tetra‐hertz (THz) frequency bands. In this article, low‐complexity but near‐optimal hybrid beamforming design is investigated in THz by considering its unique channel characteristics and discuss potential ...
Qingdong Yue, Jie Hu, Kun Yang
doaj   +1 more source

Partial Zero-Forcing for Multi-Way Relay Networks

, 2018
The ever increasing demands for mobile network access have resulted in a significant increase in bandwidth usage. By improving the system spectral efficiency, multi-way relay networks (MWRNs) provide promising approaches to address this challenge.
Ardakani, Masoud, Jing, Yindi, Noori, Moslem, Rahimian, Samira, Zhang, Wuhua   +4 more
core   +1 more source

Joint Control of Radiated and Surface Waves via Space‐Time Coding Metasurfaces

Advanced Functional Materials, EarlyView.
A unified space‐time coding metasurface platform enables simultaneous control of radiated and surface‐confined waves across multiple harmonics. Demonstrated functionalities include multi‐frequency beam shaping; surface‐wave excitation, and hybrid multiplexing.
Zihao Dai, Yi Ning Zheng, Lei Zhang, Xiao Qing Chen, Giuseppe Castaldi, Tie Jun Cui, Vincenzo Galdi   +6 more
wiley   +1 more source

Design and Fabrication of High Dielectric GRIN Lens for a Directive Antenna Using a Hybrid Filled Voxel Additive Manufacturing Technique

Advanced Materials Technologies, EarlyView.
Hybrid‐filled voxel AM enables integration of high‐permittivity materials into additively manufactured devices. Using this approach, a graded refractive index (GRIN) lens is demonstrated, achieving a 50% antenna size reduction with enhanced directivity.
Qianfang Zheng, Anna Radkovskaya, Kailun Xu, Ekaterina Shamonina, Patrick S. Grant   +4 more
wiley   +1 more source

Hybrid Beamforming With Discrete Phase Shifts for RIS-Assisted Multiuser SWIPT System

IEEE Wireless Communications Letters, 2023
Reconfigurable Intelligent Surfaces (RIS) provides an emerging affordable solution by leveraging massive low-cost reconfigurable reflective array elements. In this letter, by utilizing low-cost passive reflecting elements, a joint hybrid beamforming with
Zhen Chen, Jie Tang, Nan Zhao, Mingqian Liu, D. So   +4 more
semanticscholar   +1 more source