Results 11 to 20 of about 9,047,501 (218)

A Multi-Dimensional Resource Allocation Scheme: In Beam Hopping Technique Enhanced MF-TDMA Satellite Systems

open access: yesIEEE Access
Against the backdrop of the widespread deployment of 5G systems and humanity’s entry into a new era of sixth-generation mobile communication, countries are now turning their attention to exploring uncharted territories through satellite ...
Yifeng Jin   +5 more
doaj   +2 more sources

Millisecond Spin Relaxation Times of Distinct Electron and Hole Subensembles in MA<sub>x</sub>FA<sub>1-x</sub>PbI<sub>3</sub> Perovskite Crystals. [PDF]

open access: yesAdv Sci (Weinh)
Mixed‐cation MAx${\rm MA}_x$ FA1−x${\rm FA}_{1-x}$ PbI3${\rm PbI}_3$ perovskite crystals reveal multiple discrete electron and hole spin subensembles associated with distinct localization environments. Optically detected magnetic resonance combined with resonant spin inertia uncovers carriers spin relaxation times reaching 2 ms and identifies nuclear ...
Hu R   +6 more
europepmc   +2 more sources

Blind Joint Soft-Detection Assisted Slow Frequency-Hopping Multicarrier DS-CDMA [PDF]

open access: yes, 2000
A novel multiple-access scheme based on slow frequency-hopping multicarrier direct-sequence, code-division multiple access (SFH/MC DS-CDMA) is proposed and investigated, which can be rendered compatible with the existing second-generation narrow-band ...
Yang, L-L., Hanzo, L.
core   +2 more sources

Multi-group frequency hopping OFDMA based on statistical multiplexing [PDF]

open access: yes, 2008
In this paper, the multi-group frequency hopping OFDMA (MG-FH OFDMA) based on the statistical multiplexing is proposed for the downlink cellular system. Compared with the existed random frequency hopping OFDMA (RFH-OFDMA) system utilizing the statistical
Su, Xinghui   +9 more
core   +1 more source

Bit error simulation of DQPSK for a slow frequency hopping CDMA system in mobile radio communications [PDF]

open access: yes, 1995
Spread spectrum (SS) techniques seem to be an attractive alternative to conventional narrow-band modulation. In this paper a frequency hopping (FH) system model based on slow FH (SFH) is proposed.
Mortazavi, SH   +3 more
core   +1 more source

Research of adaptive frequency hopping technology in WIA-PA industrial wireless network [PDF]

open access: yes, 2013
WIA-PA (Wireless Networks for Industrial Automation - Process Automation) is IEC international standard. In order to solve the primary problem of wireless network in industrial applications, i.e.
Shuai Liu   +7 more
core   +1 more source

Beam-hopping over-the-air tests using DVB-S2X super-framing

open access: yes, 2022
7 S.The beam-hopping transmission concept has recently received a lot of attention due to a new level of flexibility to accommodate dynamic traffic profiles by employing the latest satellite technology.
Feltrin, E.   +7 more
core   +1 more source

The MICE Muon Beam on ISIS and the beam-line instrumentation of the Muon Ionization Cooling Experiment [PDF]

open access: yes, 2012
The international Muon Ionization Cooling Experiment (MICE), which is under construction at the Rutherford Appleton Laboratory (RAL), will demonstrate the principle of ionization cooling as a technique for the reduction of the phase-space volume occupied
A. Wilson   +815 more
core   +2 more sources

Dynamic Beam Hopping Algorithm for LEO Satellite Systems Based on User Grouping

open access: yes天地一体化信息网络, 2023
In a satellite communication system deployed with massive MIMO, when the number of users far exceeds the number of beams of the satellite, it is still difficult to satisfy the delay requirements of the satellite communication system even if the number of
Qing SHU   +5 more
doaj   +2 more sources

The PRIMA Thesaurus for Materials Science and Engineering

open access: yesAdvanced Engineering Materials, EarlyView.
The PRIMA Thesaurus is a structured vocabulary designed to improve how materials science data is described and shared. Developed with input from multiple experts, it enables clear documentation of research workflows, data exchange, and reuse across platforms.
Rossella Aversa   +8 more
wiley   +1 more source

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