Concept

Quadrature amplitude modulation

Related publications (246)

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Wavelength modulation spectroscopy: combined frequency and intensity laser modulation

Luc Thévenaz, Philippe Robert

A theoretical model of wavelength modulation spectroscopy that uses a laser diode on a Lorentzian absorption line is presented. This theory describes the general case of a current-modulated semiconductor laser for which a combined intensity and frequency m ...

Optical Society of America2003

Self-referenced method for optical path difference calibration in low-coherence interferometry

René Salathé, Theo Lasser, Boris Clément Karamata, Markus Laubscher

A simple method for the calibration of optical path difference modulation in low-coherence interferometry is presented. Spectrally filtering a part of the detected interference signal results in a high-coherence signal that encodes the scan imperfections a ...

2003

Field Assessment of Cavitation Detection Methods in Hydropower Plants

François Avellan, Mohamed Farhat, Eduard Egusquiza

An experimental investigation on Francis turbines suffering from inlet cavitation erosion on the runner blades has permitted to assess several aspects of the actual cavitation erosion detection and prediction methods based on vibrations. Detection tests in ...

International Association For Hydraulic Research2002

Bandwidth-Efficient Constant-Energy Trellis-Coded Modulation Schemes with Prescribed Decoding Delay

Bixio Rimoldi

For a general class of constant-energy trellis-coded modulation schemes with

2^{\nu}

states, necessary and sufficient conditions to guarantee that a maximum-likelihood sequence estimator can decode each symbol with a fixed delay of

\nu

symbols are deri ...

2002

Modulated ECH power absorption measurements using a diamagnetic loop in the TCV tokamak

Timothy Goodman, Jean-Marc Moret, Stefano Alberti, Adriano Manini

The additional power absorbed by the plasma can be determined from the time derivative of the total plasma energy, which can be estimated from the diamagnetic flux of the plasma using a diamagnetic loop. The main difficulty in using diamagnetic measurement ...

2002

Serially concatenated coding for broadcasting S-UMTS applications

Christina Fragouli

Satellite-UMTS supports broadcast applications that involve transmission of the same encoded data over channels that may vary significantly. The same code must allow a user with a good channel to recover the information with low complexity, while a user wi ...

2002

Bandwidth-Efficient Constant-Energy Trellis-Coded Modulation Schemes with Prescribed Decoding Delay

Bixio Rimoldi

For a general class of constant-energy trellis-coded modulation schemes with 2 ? states, necessary and sufficient conditions to guarantee that a maximum-likelihood sequence estimator can decode each symbol with a fixed delay of ? symbols are derived. Addit ...

2001

Detection of fading overlapping multipath components for mobile positioning systems

Ali H. Sayed

The Federal Communications Commission (FCC) mandate for locating the position of wireless 911 callers is fueling research in the area of mobile-positioning technologies. Overlapping multipath propagation is one of the main sources of mobile-positioning err ...

2001

A method for polarisation imaging using digital holography

Christian Depeursinge, Tristan Colomb, Etienne Cuche

A numerical holographic method, which is able to determine the amplitude components of the Jones vector of a wavefront in addition to its phase and amplitude, is presented. Two reference waves, with orthogonal polarisations interfere with the transmitted o ...

Springer-Verlag Berlin2000

Coherence transfer by single-transition cross-polarization: Quantitation of cross-correlation effects in nuclear magnetic resonance

Geoffrey Bodenhausen, Fabien Ferrage

Selective single-transition cross-polarization (ST-CP) may be achieved in four-level systems such as encountered in NMR of scalar-coupled two-spin systems (for example, 15N-1H groups in peptides), by employing two selective resonant fields applied to a pai ...

2000

Bandwidth-Efficient Constant-Energy Trellis-Coded Modulation Schemes with Prescribed Decoding Delay

Bixio Rimoldi

For a general class of constant-energy trellis-coded modulation schemes with

2^{\nu}

states, necessary and sufficient conditions to guarantee that a maximum-likelihood sequence estimator can decode each symbol with a fixed delay of

\nu

symbols are deri ...

2002