Results 31 to 40 of about 2,222,192 (302)
IEEE Access, 2019 An average bit error ratio (ABER) performance model for multiple phase shift keying (MPSK) based on a balanced detector with a fiber is presented in the free-space link for the first time.
Haifeng Yao +8 more
doaj +1 more source
Results of the Optical Downlink Experiment KIODO from OICETS Satellite to Optical Ground Station Oberpfaffenhofen (OGS-OP) [PDF]
, 2007 Optical LEO downlinks from the Japanese OICETS to the optical ground station built by the German Aerospace Center (DLR) near Munich have been performed. This was the first optical LEO downlink on European grounds.
Perlot, Nicolas +13 more
core +1 more source
IEEE Photonics Journal, 2017 Mach–Zehnder (MZ) modulators are widely used in optical transmitters to generate high-speed optical signals. With electronic dispersion compensation (EDC), the driving signals to MZ modulators change from digital to analog, or continuous waveforms.
Xiatao Huang +6 more
doaj +1 more source
Use of Negative Impedance Converters for Bandwidth Extension of Optical Transmitters
IEEE Open Journal of Circuits and Systems, 2021 The design and advantages of a novel light emitting diode (LED) bandwidth extension technique, based on the adoption of negative impedance converters (NICs), are discussed in the context of visible light communication systems.
Amany Kassem, Izzat Darwazeh
doaj +1 more source
Lambertian source modelling of free space optical ground-to-train communications [PDF]
, 2012 There is a increasing demand for high speed data services while travelling on trains and other means of public transportation. Hence, an alternative technology to radio frequency (RF) communications called free space optics (FSO) could be used to provide
Ghassemlooy, Zabih +9 more
core +1 more source
Performance optimization of free-space optical communication protocols based on results from FSO demonstrations [PDF]
, 2007 The mobile free-space optical channel mainly suffers from relatively long link outages, produced by short-term blockings of the line-of-sight (obstacles, clouds), pointing- and tracking-errors or deep signal-fades caused by index of refraction turbulence
Bernhard Epple, Epple, Bernhard
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IEEE Access, 2023 The use of multiple transmitters in a turbulent free-space optical (FSO) communication link can enhance the systems performance because greater received power can improve receiver sensitivity. Nevertheless, the effect of having more power at the receiver
Jeremiah Oluwatosin Bandele +3 more
doaj +1 more source
Linearisation of frequency-hopped transmitters using Cartesian feedback [PDF]
, 1995 This paper investigates the potential of the Cartesian feedback technique in linearising frequency-hopped (FH) transmitters for use in third generation mobile communication systems.
Boloorian, M, McGeehan, JP
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Multi-user indoor optical wireless communication system channel control using a genetic algorithm [PDF]
, 2011 A genetic algorithm controlled multispot transmitter is demonstrated that is capable of optimising the received power distribution for randomly aligned single element receivers in multiple fully diffuse optical wireless communications systems with ...
M.S. Leeson +7 more
core +1 more source
Multi-format transmitters for coherent optical M-PSK and M-QAM transmission
, 2022 S.225-229Coherent optical transmission returns into the focus of research. One significant advantage is the preservation of all the information of the optical field during detection, leading to enhanced possibilities for optical multi-level modulation ...
Seimetz, M.
core +1 more source