Results 51 to 60 of about 1,380,112 (215)

Flexible wearable electronics for cardiovascular monitoring from surface signals to deep physiological insights

FlexMat, EarlyView.
This review organizes flexible wearable electronics for cardiovascular monitoring into four interconnected information layers: surface electrophysiology, hemodynamic sensing, vascular imaging, and biofluid biomarker analysis. This framework clarifies how electrical rhythm, vascular loading, structural and flow‐related features, and biochemical states ...
Qiao Chen, Hongwen Chen, Yuanyuan Li, Pingan Yang, Rui Li, Zhihao Zhou   +5 more
wiley   +1 more source

Low Complexity and Robust Codebook-Based Analog Beamforming for Millimeter Wave MIMO Systems

IEEE Access, 2017
Millimeter-wave (mm-Wave) MIMO systems have been proposed to achieve higher spectral efficiency via the hybrid beamforming structure, which consists of analog beamforming and digital beamforming.
Yong Niu, Ziqi Feng, Min Chen, Yong Li, Zhangdui Zhong, Bo Ai   +5 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

Scalable Large Field‐of‐view 3D Photoacoustic Ultrasound Imaging With Digital Multiplexing for Human Extremities

Laser &Photonics Reviews, EarlyView.
A digitally multiplexed, large‐aperture photoacoustic and ultrasound imaging architecture is presented to overcome the fundamental limited‐view artifact inherent in conventional arrays. By significantly broadening the structural detection coverage, this scalable platform enables high‐fidelity 3D visualization of human extremities within a single ...
Sinyoung Park, Minsik Sung, Hyunhee Kim, Kijong Lee, Joongho Ahn, Eun‐Yeong Park, Sungsik Park, Hyung Ham Kim, Chulhong Kim   +8 more
wiley   +1 more source

EVALUATING THE IMPACT OF CHANNEL FADING AND ANTENNA ARCHITECTURE ON BEAMFORMING PERFORMANCE FOR NEXT-GENERATION WIRELESS SYSTEMS [PDF]

ICTACT Journal on Communication Technology
Antenna beamforming has emerged as a promising solution for the advanced wireless communication systems particularly where large number of antennas is used at the transmitter and receiver (multiple input multiple output-MIMO) systems.
Kartik Ramesh Patel, Sanjay Dasrao Deshmukh   +1 more
doaj   +1 more source

Digital Twin‐Based Optimization of Service Availability in LEO Mega Constellations Considering Handover Delays in Open RAN

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT As non‐terrestrial networks (NTNs) become integral to future 6G systems, ensuring seamless connectivity and service continuity over low Earth orbit (LEO) satellite constellations is essential. This work investigates the impact of open radio access network (RAN) functional splits on handover performance in NTNs, focusing on minimizing service ...
Siva Satya Sri Ganesh Seeram, Luca Feltrin, Mustafa Ozger, Cicek Cavdar   +3 more
wiley   +1 more source

Reducing feedback requirements of the multiple weight opportunistic beamforming scheme via selective multiuser diversity [PDF]

, 2008
Opportunistic beamforming (OB) relies on the transmission of Channel State Information (CSI) in the form of instantaneous Signal to Noise Ratio (SNR) from Mobile Stations (MSs) back to the Base Station (BS) for scheduling purposes that increase ...
Nicolaou, M, Marios Nicolaou, Angela Doufexi, Doufexi, A, Armour, SMD, Simon Armour   +5 more
core   +1 more source

Spectral Efficiency of mmWave Massive MIMO Systems with Hybrid Beamforming

Wasit Journal of Engineering Sciences
Millimeter wave communications (mmWave) has been considered a key enabling technique for 5G systems since it offers orders of magnitude more spectrum than current frequency bands.
Sajjad Kadhim, Hasan Khazaal, Hamed Al-Raweshidy, Ismail Hburi, Ruwa Mohammed, Asmaa Aliwy   +5 more
doaj   +1 more source

Joint User Scheduling and MU-MIMO Hybrid Beamforming Algorithm for mmWave FDMA Massive MIMO System

International Journal of Antennas and Propagation, 2016
The large bandwidth and multipath in millimeter wave (mmWave) cellular system assure the existence of frequency selective channels; it is necessary that mmWave system remains with frequency division multiple access (FDMA) and user scheduling. But for the
Jing Jiang, Deting Kong
doaj   +1 more source

Directional modulation design for multi-beam multiplexing based on hybrid antenna array structures

EURASIP Journal on Advances in Signal Processing, 2023
For integrated sensing and communication, one important research direction is to employ various beamforming techniques to avoid interference between the two functions.
Maolin Li, Bo Zhang, Baoju Zhang, Wei Liu, Taekon Kim, Cheng Wang   +5 more
doaj   +1 more source