Results 111 to 120 of about 52,116 (297)

Covert Information Mapped Spatial and Directional Modulation toward Secure Wireless Transmission. [PDF]

Sensors (Basel), 2021
Tian J, Chen H, Wang Z, Shi X, Ji Z, Li X.   +5 more
europepmc   +1 more source

On directional modulation: An analysis of transmission scheme with multiple directions

2015 IEEE International Conference on Communication Workshop (ICCW), 2015
Increasing the spectral efficiency was always the motivation behind the evolution of wireless communication systems. Also, due to the widespread usage of wireless systems, securing the transmitted data rises as a main concern nowadays. Hereby, we introduce a scheme that increases the capacity of wireless systems by transmitting multiple independent ...
Mohammed Hafez, Hüseyin Arslan
openaire   +2 more sources

Glissile Interphase Boundaries Enable Collective Phase Switching in Epitaxial Polar Oxides

Advanced Functional Materials, EarlyView.
A triple point is identified in the phase diagram of low‐symmetry epitaxial BiFeO3 thin film along with an extended regime of phase competition associated with a flattened energy landscape. The electromechanical response is shown to be governed by correlated interphase‐boundary motion, including scale‐free avalanche dynamics characteristic of systems ...
Mohammad Moein Seyfouri, Oliver Paull, Ralph Bulanadi, Yasuhiro Sakamoto, Shintaro Yasui, Mikayla Lord, Mahak Chhabra, David Walker, Patrycja Paruch, Shery Chang, Nagarajan Valanoor, Daniel Sando   +11 more
wiley   +1 more source

Directional modulation design based on crossed-dipole arrays for two signals with orthogonal polarisations [PDF]

, 2018
Directional modulation (DM) is a physical layer security technique based on antenna arrays and so far the polarisation information has not been considered in its designs.
Lan, X., Zhang, B., Liu, W., Bo Zhang, Xiang Lan, Wei Liu   +5 more
core   +1 more source

Chiral Phase Change Nanomaterials

Advanced Functional Materials, EarlyView.
This work demonstrates reversible, non‐volatile phase transitions in chiral Ge2${\rm Ge}_2$Sb2${\rm Sb}_2$Te5${\rm Te}_5$ (GST) nanohelices for high‐speed optical modulation of chirality and dynamic control of the state of polarization (SOP). The chiral nanostructures are fabricated using a highly directional, wafer‐scale physical vapor deposition ...
Joshua A. Burrow, Md Shah Alam, Riad Yahiaoui, Evan M. Smith, Ryan Laing, Jules Gardener, Thomas A. Searles, Piyush J. Shah, Shivashankar Vangala, Joshua R. Hendrickson, Andrew M. Sarangan, Imad Agha   +11 more
wiley   +1 more source

A Cooperative Network Coding Strategy for the Interference Relay Channel. [PDF]

, 2012
In this paper, we study an interference relay network with a satellite as relay. We propose a cooperative strategy based on physical layer network coding and superposition modulation decoding for uni-directional communications among users.
Méric, Hugo, Bui, Huyen Chi, Lacan, Jérôme, Boucheret, Marie-Laure   +3 more
core   +1 more source

Multi-user directional modulation with reconfigurable holographic surfaces

EURASIP Journal on Wireless Communications and Networking
Large intelligent surfaces arise as an emerging technology and critical building block for sixth-generation (6G) wireless networks. Reconfigurable holographic surfaces (RHSs) have been attracting significant attention recently as active antenna arrays ...
M. Yaser Yağan, Samed Keşir, İbrahim Hökelek, Ali E. Pusane, Ali Görçin   +4 more
doaj   +1 more source

Dynamic Interfacial Chemistry of Choline Chloride as Electrolyte Additive for Stable Zn‐Iodine Batteries

Advanced Functional Materials, EarlyView.
Choline chloride (ChCl) additive enables dynamic interface engineering in Zn‐I2 batteries by forming hydrophobic polyiodide complexes and a Zn‐stabilizing Ch+‐rich layer under electric field modulation. This dual‐function strategy suppresses iodine hydrolysis and dendrite formation, while optimizing Zn2+ solvation and transport for high‐efficiency ...
Xiaoyu Bi, Yuchuan Ren, Ao Yu, Linlin Yang, Ren He, Yapeng Cheng, Xingqi Chang, Xuan Lu, Yanting Xie, Qian Xue, Hu Yuan, Canhuang Li, Runzhou Huang, Jordi Jacas Biendicho, Chaoqi Zhang, Jian Shang, Andreu Cabot   +16 more
wiley   +1 more source

Dye‐Initiated Chirped Cholesteric Polymer Networks Exhibiting Broadband Dissipative Chiral Photonic Bands

Advanced Functional Materials, EarlyView.
A dye‐based photoinitiator acting as a structure‐directing element, guides the formation of a cholesteric polymer network that behaves as a chirped photonic structure with dissipative chiral coupling. Photopolymerization freezes a depth‐dependent helical pitch, broadening the Bragg resonance spectrum.
Alfredo Mazzulla, Pasquale Pagliusi, Gabriella Cipparrone   +2 more
wiley   +1 more source

MXene Wrapped Magnetic Mesocrystals for Durable Redox Catalytic Cancer Therapy and Responsive MRI

Advanced Functional Materials, EarlyView.
Conformal wrapping of ultrathin Ti3C2Tx MXene nanosheets on Fe3O4 mesocrystals creates topology‐stabilized Schottky junctions that direct photoinduced electron transfer under NIR irradiation. The unique architecture sustains Fenton catalysis, promotes continuous hydroxyl radical production, and provides photo‐responsive MRI contrast.
Min Jun Ko, Seongchan Kim, Jun‐Hyeok Han, Sanghee Lee, Minji Ahn, Hong En Fu, Young Jun Jang, Yoo Sang Jeon, Weiguo Li, Young Keun Kim, Dong‐Hyun Kim   +10 more
wiley   +1 more source