منابع مشابه
Robust bandlimited watermarking with trellis coded modulation
Digital watermarking is equivalent to bandlimited, powerlimited digital communication. The power limit is due to the requirement of imperceptible watermarks, and has long been recognized. The bandwidth limit is due to the lowpass spectrum of images and possible lowpass attacks (malicious or unintentional). This is related to the concept of channel capacity, and has only recently been addressed ...
متن کاملJoint Coding and Modulation Designs for Bandlimited Satellite Channels
This thesis addresses the problem of severe bandwidth. and power limitation of future satellite systems by a joint consideration of coding and modulation. Bandwidth economy is achieved by two methods. First, baseband pulses with rapid spectral rolloff and less than unity bandwidth-to-symbol-rate ratioare obtained by allowing controlled intersymbol interference (ISI). Second, phase shift keying ...
متن کاملIntensity modulation of pseudocolor images.
Fura-2 is a popular real-time fluorescent indicator used to image intracellular, free calcium concentrations ([Ca2+]i) in living cells. One difficulty with fura-2-based digital imaging is how to best display the [Ca2+]i information that is acquired. Typically, only the [Ca2+]i as pseudocolor data are displayed, and the localization and intensity of the dye are not presented. This paper describe...
متن کاملWavelength modulation spectroscopy: combined frequency and intensity laser modulation.
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 modulation with an arbitrary phase shift occurs. On the basis of this model, the effect of several modulation parameters on the detected sign...
متن کاملLossless intensity modulation in integrated photonics.
We present a dynamical analysis of lossless intensity modulation in two different ring resonator geometries. In both geometries, we demonstrate modulation schemes that result in a symmetrical output with an infinite on/off ratio. The systems behave as lossless intensity modulators where the time-averaged output optical power is equal to the time-averaged input optical power.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: IEEE Transactions on Communications
سال: 2012
ISSN: 0090-6778
DOI: 10.1109/tcomm.2012.091712.110496