Results 61 to 70 of about 29,221 (286)

Neural Network DPD for Aggrandizing SM-VCSEL-SSMF-Based Radio over Fiber Link Performance

Photonics, 2021
This paper demonstrates an unprecedented novel neural network (NN)-based digital predistortion (DPD) solution to overcome the signal impairments and nonlinearities in Analog Optical fronthauls using radio over fiber (RoF) systems.
Muhammad Usman Hadi, Muhammad Awais, Mohsin Raza, Kiran Khurshid, Hyun Jung   +4 more
doaj   +1 more source

Comparison of Transmitter Nonlinearity Impairments in externally modulated Sigma-Delta-over Fiber vs Analog Radio-over-Fiber links [Elektronisk resurs]

, 2022
Sigma-Delta-over-Fiber and Analog-Radio-over-Fiber are compared in terms of non-linearity impairments in a transmitter with external optical modulation. The results show that Sigma-Delta-over-Fiber is more robust towards nonlinear characteristics in the ...
Fager, Christian,, Olofsson, Frida,, Aabel, Lise,, Karlsson, Magnus,   +3 more
core  

NR Conformance Testing of Analog Radio-over-LWIR FSO Fronthaul link for 6G Distributed MIMO Networks

, 2023
We experimentally test the compliance with 5G/NR 3GPP technical specifications of an analog radio-over-FSO link at 9 mu m. The ACLR and EVM transmitter requirements are fulfilled validating the suitability of LWIR FSO for 6G fronthaul.
Han, M.,, Joharifar, Mahdieh,, Maisons, G.,, Joharifar, M.,, Yu, X.,, Popov, S.,, Popov, Sergei,, Teissier, R.,, Maisons, Gregory,, Wang, M.,, Lourdudoss, S.,, Zhang, L.,, Spolitis, S.,, Pang, Xiaodan,, Djupsjöbacka, Anders,, Lourdudoss, Sebastian,, Puerta, R.,, Ozolins, Oskars,, Puerta, Rafael,, Schatz, R.,, Fan, Yuchuan,, Abautret, Johan,, Spolitis, Sandis,, Sun, Y. -T,, Schatz, Richard,, Teissier, Roland,, Bobrovs, Vjaceslavs,, Sun, Yan-Ting,, Bobrovs, V.,, Han, Mengyao,, Abautret, J.,, Zhang, Lu,, Yu, Xianbin,, Wang, Muguang,   +33 more
core   +1 more source

A Dislocation Perspective on Strength and Toughness in Ceramics

Advanced Engineering Materials, EarlyView.
Dislocations in ceramics enjoy a long but yet under‐appreciated history. The three research waves for dislocations in ceramics highlight the topic evolution over the last 90 years. This review focuses on the impact of dislocation on strength and toughness in ceramics.
Xufei Fang
wiley   +1 more source

Laser‐Induced Graphene from Waste Almond Shells

Advanced Functional Materials, EarlyView.
Almond shells, an abundant agricultural by‐product, are repurposed to create a fully bioderived almond shell/chitosan composite (ASC) degradable in soil. ASC is converted into laser‐induced graphene (LIG) by laser scribing and proposed as a substrate for transient electronics.
Yulia Steksova, Anna Chiara Bressi, Marina Galliani, Attilio Marino, Gianni Ciofani, Eduardo Machado‐Charry, Hilda Gomez Bernal, Alessandra Francini, Luca Sebastiani, Francesco Greco   +9 more
wiley   +1 more source

Performance Limits of Direct Wideband Coherent 3D Localization in Distributed Massive MIMO Systems

Sensors, 2021
We address the accuracy of wideband direct position estimation of a radio transmitter via a distributed antenna array in 5G cellular systems. Our derivations are based only on the presence of spatially coherent line-of-sight (LoS) signal components ...
Nenad Vukmirović, Miljko Erić, Petar M. Djurić   +2 more
doaj   +1 more source

Optoelectronic Synaptic Devices Using Molecular Telluride Phase‐Change Inks for Three‐Factor Learning

Advanced Functional Materials, EarlyView.
Optoelectronic synaptic devices based on solution‐processed molecular telluride GST‐225 phase‐change inks are demonstrated for three‐factor learning. A global optical signal broadcast through a silicon waveguide induces non‐volatile conductance updates exclusively in locally electrically flagged memristors.
Kevin Portner, Dhananjeya Kumaar, Giacomo Torti, Killian Keller, Till Zellweger, Florian M. Schenk, Christoph Weilenmann, Daniel Chelladurai, Vara Prasad Jonnalagadda, Ghazi Sarwat Syed, Vanessa Wood, Jürg Leuthold, Alexandros Emboras, Maksym Yarema, Mathieu Luisier   +14 more
wiley   +1 more source

Ultra-Wideband Analog Radio-over-Fiber Communication System Employing Pulse-Position Modulation

Applied Sciences
This research presents a novel approach to 28 GHz impulse radio ultra-wideband (IR-UWB) transmission using pulse position modulation (PPM) over an analog radio-over-fiber (ARoF) link, investigating the impact of fiber-based fronthaul on the overall ...
Sandis Migla, Kristaps Rubuls, Nikolajs Tihomorskis, Toms Salgals, Oskars Ozolins, Vjaceslavs Bobrovs, Sandis Spolitis, Arturs Aboltins   +7 more
doaj   +1 more source

Phase Fluctuation Cancellation for Uplink Radar Arrays Based on Passive Frequency Mixing

IEEE Photonics Journal, 2018
Precise time-difference detections among different radars in uplink radar arrays require ultrastable phase transfer in bidirectional analog optical fiber links.
Zonglei Li, Lianshan Yan, Bin Luo, Wei Pan   +3 more
doaj   +1 more source

Receptor‐Free Identification of Toxic Gases Enabled by Hygroscopic Aqueous Salt Films

Advanced Functional Materials, EarlyView.
Water as a gas sensor coating sounds impossible—until it stops evaporating. Here, hygroscopic salt solutions (LiCl, LiBr, H3PO4) form non‐drying aqueous films on CNT chemiresistors under ambient air. Gases partition into these liquid layers, sometimes transforming into water, and generate salt‐specific resistance fingerprints across a four‐channel ...
Seongwoo Lee, Yun‐Tae Kim, Hwarang Choi, Sanghwan Park, Seongyeop Lim, Chang Young Lee   +5 more
wiley   +1 more source