Results 51 to 60 of about 435,575 (301)

Fast carrier recovery in FHSS systems with DDS based Costas loop [PDF]

Electronics, 2015
Owing to fast change of carrier frequency, the usage of coherent demodulation methods in Frequency-Hopping Spread Spectrum (FHSS) communication systems is limited by the coherent state acquisition performed by the local oscillator.
Slavko Šajić
doaj   +1 more source

Method of Non-Data-Aided Carrier Recovery with Modulation Identification [PDF]

, 2004
A non-data aided carrier recovery technique using digital modulation format identification called multi-mode PLL (Phase Locked Loop) is proposed. This technique can be interpreted as a modulation identification method that is robust against static phase ...
Kohno, Ryuji, Morelos-Zaragoza, Robert H, Umebayashi, Kenta   +2 more
core   +1 more source

Blind Carrier Phase Recovery for General 2{\pi}/M-rotationally Symmetric Constellations

, 2012
This paper introduces a novel blind carrier phase recovery estimator for general 2{\Pi}/M-rotationally symmetric constellations. This estimation method is a generalization of the non-data-aided (NDA) nonlinear Phase Metric Method (PMM) estimator already ...
Bouallègue, Ammar, Jarboui, Slaheddine, Slimane, Emna Ben   +2 more
core   +1 more source

Ultrafast electroabsorption dynamics in an InAs quantum dot saturable absorber at 1.3 mu m [PDF]

, 2006
The authors report a direct measurement of the absorption dynamics in an InAs p-i-n ridge waveguide quantum dot modulator. The carrier escape mechanisms are investigated via subpicosecond pump-probe measurements at room temperature, under reverse bias ...
Gomez-Iglesias, A., Malins, D. B., Miller, Alan, Rafailov, E. U., Sibbett, W., White, S. J.   +5 more
core   +2 more sources

Structural biology of ferritin nanocages

FEBS Letters, EarlyView.
Ferritin is a conserved iron‐storage protein that sequesters iron as a ferric mineral core within a nanocage, protecting cells from oxidative damage and maintaining iron homeostasis. This review discusses ferritin biology, structure, and function, and highlights recent cryo‐EM studies revealing mechanisms of ferritinophagy, cellular iron uptake, and ...
Eloise Mastrangelo, Flavio Di Pisa
wiley   +1 more source

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source

CARRIER RECOVERY AND CLOCK RECOVERY FOR QPSK DEMODULATION

International Journal of Research in Engineering and Technology, 2014
This paper deals with the design and implementation aspects of high data rate digital demodulators. The Existing remote sensing satellites support data rates of several hundred mega bits per second. The future trend is towards giga bit rate transmission.
openaire   +1 more source

High-speed pulse train amplification in semiconductor optical amplifiers with optimized bias current [PDF]

, 2017
In this paper, we have experimentally investigated the optimized bias current of semiconductor optical amplifiers (SOAs) to achieve high-speed input pulse train amplification with high gain and low distortion.
Ghafouri-Shiraz, H., Hou, Lianping, Kelly, Anthony E., Xia, Mingjun   +3 more
core   +1 more source

AAA+ protein unfoldases—the Moirai of the proteome

FEBS Letters, EarlyView.
AAA+ unfoldases are essential molecular motors that power protein degradation and disaggregation. This review integrates recent cryo‐electron microscopy (cryo‐EM) structures and single‐molecule biophysical data to reconcile competing models of substrate translocation.
Stavros Azinas, Marta Carroni
wiley   +1 more source

Electric field-induced carrier recovery and thermal stability of radiation-induced defects in β-Ga2O3

APL Materials
This study explores the effects of proton irradiation and post-irradiation carrier removal and recovery mechanisms on β-Ga2O3 Schottky diodes. Carrier recovery was achieved through voltage stressing and thermal annealing, providing insights into defect ...
Hemant Ghadi, Tal Kasher, Joe F. McGlone, Lingyu Meng, Dong Su Yu, Hongping Zhao, Michael. W. McCurdy, Daniel M. Fleetwood, Ronald D. Schrimpf, Steven A. Ringel   +9 more
doaj   +1 more source