Results 31 to 40 of about 2,266,545 (303)

Data-Aided Versus Blind Single-Carrier Coherent Receivers

IEEE Photonics Journal, 2010
Fiber-optic research in signal processing for the first generation of coherent communication systems was dominated by receivers with blind adaptation. Next-generation systems will require a scalable and modular design for higher order modulation formats.
Maxim Kuschnerov, M. Chouayakh, K. Piyawanno, B. Spinnler, E. de Man, P. Kainzmaier, Mohammad S. Alfiad, A. Napoli, Berthold Lankl   +8 more
doaj   +1 more source

Real-Time Underwater Wireless Optical Communication System Based on LEDs and Estimation of Maximum Communication Distance

Sensors, 2023
This paper presents a real-time underwater wireless optical communication (UWOC) system. The transmitter of our UWOC system is equipped with four blue LEDs, and we have implemented pre-emphasis technology to extend the modulation bandwidth of these LEDs.
Minglun Zhang, Hongyu Zhou
doaj   +1 more source

Implementation & Performance Investigation of Dicode PPM over Dispersive Optical Channels [PDF]

This work is concerned with the development and investigation of a Dicode PPM (DiPPM) system. A DiPPM coder was developed to code any input PCM signal into DiPPM format. A further investigation took place on the DiPPM spectrum and associated output.
Charitopoulos, Romanos
core   +4 more sources

Synthesis method for distributed amplifiers

Journal of Telecommunications and Information Technology, 2003
New design method is presented for distributed amplifiers (DA). It is shown that by proper design of the applied transmission lines (TL) between the active devices the image impedance and the cut-off frequency COF of the input or output line of the DA ...
Attila Zólomy
doaj   +1 more source

Phase tracking for sub-shot-noise-limited receivers

Physical Review Research, 2020
Nonconventional receivers for phase-coherent states based on non-Gaussian measurements such as photon counting surpass the sensitivity limits of shot-noise-limited coherent receivers, the quantum noise limit (QNL). These non-Gaussian receivers can have a
M. T. DiMario, F. E. Becerra
doaj   +1 more source

Time-Controlled SPAD Receivers in Optical Wireless Communication System

IEEE Photonics Journal, 2023
Single-photon avalanche diodes (SPADs) capable of single photon detection are promising optical sensors for use as receivers in optical wireless communication (OWC) systems.
Junzhi Liu, Wei Jiang, Shiva Kumar, M. Jamal Deen   +3 more
doaj   +1 more source

Neuropsychological and Educational Outcomes in Shwachman–Diamond Syndrome—A Report From the North American Shwachman–Diamond Syndrome Registry

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Shwachman–Diamond syndrome (SDS) is a rare autosomal recessive ribosomopathy characterized by bone marrow failure and multisystem involvement, with emerging evidence of associated neurocognitive impairment. Methods We conducted a retrospective study of 240 individuals with biallelic Shwachman–Bodian–Diamond syndrome (SBDS) mutations
Jane Koo, Melissa Gerstle, Leah Cheng, Richard Cooper, Katherine Coyne, Claire Dusa, Naomi E. Joffe, Diana Schwarz, Sarah Steltz, Akiko Shimamura, Kasiani C. Myers, Thea Quinton   +11 more
wiley   +1 more source

Sensitivity Improvement of 2.5 Gb/s Receivers Using AlGaAsSb Avalanche Photodiodes

Applied Sciences
At a 1550 nm wavelength, the optical sensitivity of conventional indium gallium arsenide (InGaAs)-based avalanche photodiodes (APDs) is restricted by their high excess noise, hindering their performance in long-range free-space optical communication ...
Jonty Veitch, Ding Chen, Jonathan Petticrew, Jo Shien Ng, Chee Hing Tan   +4 more
doaj   +1 more source

Survival After Hematopoietic Stem Cell Transplantation in Diamond–Blackfan Anemia Syndrome: The Role of Iron Overload—A Systematic Review

Pediatric Blood &Cancer, EarlyView.
ABSTRACT We assessed the effect of iron overload (IO) on mortality and complications following hematopoietic stem cell transplantation (HSCT) in patients with Diamond–Blackfan anemia syndrome (DBAS) in a systematic review of individual participant data and cohort data from observational studies.
Geoffrey Z. L. Kuppens, Evangelia Kiakou, Lieke de Zwart, Maurizio Miano, Eduard J. van Beers, Marc Bierings, Marije Bartels   +6 more
wiley   +1 more source

Evaluation of the Scintillation Loss for Optical Communication Systems with Direct Detection [PDF]

, 2006
In optical communications through the atmosphere, the evaluation of a link feasibility often requires the quantification of the scintillation penalty in terms of power loss. To find how much additional optical power is needed to reach the bit-error-rate (
Perlot, Nicolas
core