Results 91 to 100 of about 49,696 (296)

Unraveling the Electronic Structure of Silicon Vacancy Centers in 4H‐SiC

Advanced Functional Materials, EarlyView.
The electronic structure of the silicon vacancy in 4H‐SiC is probed via transient absorption spectroscopy, uncovering previously inaccessible excited states of the quartet and doublet spin channels, including the V2' transition. In combination with theoretical analysis, a comprehensive picture of the electronic structure is established.
Ali Tayefeh Younesi, Minh Tuan Luu, Christopher Linderälv, Vytautas Žalandauskas, Marianne Etzelmüller Bathen, Nguyen Tien Son, Takeshi Ohshima, Gergő Thiering, Lukas Razinkovas, Ronald Ulbricht   +9 more
wiley   +1 more source

Orthogonal Time-Frequency-Space (OTFS) and Related Signaling

CoRR
The principle of orthogonal time-frequency-space (OTFS) signaling is firstly analyzed, followed by explaining that OTFS embeds another signaling scheme referred to as orthogonal short-time Fourier (OSTF). Then, the relationship among OTFS, OSTF, orthogonal frequency-division multiplexing (OFDM) and single-carrier frequency-division multiple-access (SC ...
openaire   +2 more sources

Performance of Broadband Multicarrier DS-CDMA using Space-Time Spreading-Assisted Transmit Diversity

, 2005
In this contribution multicarrier direct-sequence code-division multiple-access (MC DS-CDMA) using space–time spreading (STS)-assisted transmit diversity is investigated in the context of broadband communications over frequency-selective Rayleigh-fading ...
Yang, L-L., Hanzo, L.
core  

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

Quasi‐orthogonal space–frequency and space–time–frequency block codes with modified performance and simplified decoder

IET Communications, 2017
Due to their superior performance and moderate computational complexity, quasi‐orthogonal space–frequency block codes (QOSFBCs) and quasi‐orthogonal space–time–frequency block codes (QOSTFBCs) are among prime candidates for implementation in multiple‐input multiple‐output communications systems.
Faroukh Koroupi, Alireza Morsali, Vida Niktab, Mostafa Shahabinejad, Siamak Talebi   +4 more
openaire   +1 more source

Maximum likelihood receivers for space-time coded MIMO systems with gaussian estimation errors [PDF]

Maximum likelihood (ML) receivers for space-time coded multiple-input multiple-output (MIMO) systems with Gaussian channel estimation errors are proposed. Two different cases are considered. In the first case, the conditional probability density function
Chen, Yunfei, Beaulieu, Norman C.
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

OTFS technology research and prospect

Dianxin kexue, 2021
Recently, a new multi-carrier modulation technique termed orthogonal time frequency space (OTFS) was proposed.In the OTFS modulation, the data symbols are modulated at the delay-Doppler plane and spread on all the time-frequency resource elements with ...
Hang LONG, Sen WANG, Linfei XU, Yinhua JIA, Lu DAI   +4 more
doaj   +2 more sources

Artery‐on‐Chip Demonstrates Mechanical and Functional Features of Healthy and Diseased Living Smooth Muscle Tissue

Advanced Functional Materials, EarlyView.
This article details the development of an artery‐on‐chip platform for in vitro arterial disease modeling and therapeutic discovery. It describes the fabrication of a fibrin biomaterial scaffold seeded with iPSC‐derived smooth muscle and endothelial cells, mimicking native artery properties. Two genetic disease models showcase the platform's ability to
Danielle Yarbrough, Roy Chen, Katerina Katsouleas, Jaron Shoemaker, Travis Brady, Tianfang Yu, Jennifer Arthur Ataam, Connor Amelung, Lakshmi Santhanam, Ioannis Karakikes, Sharon Gerecht   +10 more
wiley   +1 more source

Orthogonal Time Frequency Space Modulation: A Tutorial View on Delay-Doppler Communications via Zak Transform

IEEE Open Journal of the Communications Society
The recently proposed orthogonal time frequency space (OTFS) modulation, a representative delay-Doppler (DD) communication scheme, has demonstrated appealing performance over doubly-selective channels.
Shuangyang Li, Peter Jung, Weijie Yuan, Zhiqiang Wei, Jinhong Yuan, Baoming Bai, Giuseppe Caire   +6 more
doaj   +1 more source