Results 1 to 10 of about 49,683 (155)

Directional Modulation-Enhanced Multiple Antenna Arrays for Secure and Precise Wireless Transmission [PDF]

open access: yesSensors, 2019
Directional modulation (DM) technique has the ability to enhance the physical layer security (PLS) of wireless communications. Conventional DM schemes are usually based on a single antenna array with the basic assumption that eavesdroppers (Eves) and ...
Wei Zhang   +4 more
doaj   +4 more sources

Directional Modulation With Cooperative Receivers

open access: yesIEEE Access, 2018
Directional modulation (DM) refers to a class of efficient techniques for enhancing the physical layer security of wireless communications. However, conventional DM approaches cannot guarantee the transmission security when eavesdroppers are located ...
Yanping Xiao   +5 more
doaj   +3 more sources

Two Low-Complexity Efficient Beamformers for an IRS- and UAV-Aided Directional Modulation Network

open access: yesDrones, 2023
As excellent tools for aiding communication, an intelligent reflecting surface (IRS) and an unmanned aerial vehicle (UAV) can extend the coverage area, remove the blind area, and achieve a dramatic rate improvement.
Yeqing Lin   +8 more
doaj   +3 more sources

Spatial and Directional Modulation Systems for Near-Field Secure Transmission [PDF]

open access: yesSensors
The proliferation of massive antenna arrays and the consequent intensification of near-field effects with 6G necessitate addressing critical security challenges in near-field communication environments.
Ji Liu   +4 more
doaj   +2 more sources

Ascophyllan Supplementation Is Safe and Associated with Exploratory Modulation of Innate Immune Phenotypes, Biochemical Parameters, and the Gut Microbiome in a Randomized Pilot Trial [PDF]

open access: yesMarine Drugs
Background: Ascophyllan, a sulfated polysaccharide extracted from brown seaweed, has shown immunomodulatory and antioxidant effects in preclinical studies, yet human clinical evidence remains scarce.
Shohei Mizuno   +16 more
doaj   +2 more sources

In vivo evaluation and material basis of the bi-directional immune modulatory effect of Scutellaria barbata D. Don extract [PDF]

open access: yesFrontiers in Medicine
The innate immunity of host defends universally against various invading viruses, providing attractive targets for development of novel broad-spectrum antivirals.
Kerui Wu   +6 more
doaj   +2 more sources

Intensity-asymmetric wavefront shaping in nonlocal meta-lens [PDF]

open access: yesNature Communications
Asymmetric wavefront shaping can unlock essential functionalities for next-generation photonic systems, such as unidirectional transmission, nonlinear signal routing, and nonreciprocal light control.
Jin Yao   +8 more
doaj   +2 more sources

Digital coding metamaterials with multi-modulation schemes and beam steering for intra-chip millimeter-wave connectivity [PDF]

open access: yesScientific Reports
In modern wireless communication systems, data transmission is achieved through the collaboration of digital modulation circuits and antennas. Digital baseband signals are first modulated in terms of amplitude, frequency, and phase of the carrier wave ...
Zhicheng Shen, Sajjad Taravati, Jize Yan
doaj   +2 more sources

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