This paper studies the Hierarchical Modulation, a transmission strategy of the approaching scalable multimedia over frequencyselective fading channel for improving the perceptible quality. An optimization strategy for Hierarchical Modulation and convolutional encoding, which can achieve the target bit error rates with minimum global signal-to-noise ratio in a single-user scenario, is suggested....

In this paper, a scalable multimedia system with unequal error probabilities (UEP) is considered. A combination of adaptive modulation and hierarchical (embedded) constellations is implemented to realize three different levels of data priorities. The highest priority data bits spread over all available subcarriers with a relatively low modulation order. The next data levels are embedded on top ...

This paper investigates from an automatic speech recognition perspective, the most effective way of combining Multi Layer Perceptron (MLP) classifiers trained on different ranges of auditory and modulation frequencies. Two different combination schemes based on MLP are considered. The first one operates in parallel fashion and is invariant to the order in which feature streams are introduced. T...

Aiming at the electromagnetic radiation and noise problem resulting from the electric drive system, the application of the random space vector PWM (SVPWM) strategy is proposed to be used in the electric vehicle (EV). The random SVPWM strategy is introduced firstly. Furthermore, the closed-loop control system is analyzed based on the vector control method using the random SVPWM technology. Final...

transfer matrix method (tmm) has been applied to analyze characteristics of semiconductor laser optical amplifiers. the input signal is sinusoidal modulating wave and we do not assume the modulating bias signal as well. we have shown that the distoration arises from gain modulation at low modulation frequencies, but in microwave modulation frequencies, the gain takes an average value and the re...

This paper introduces a new method to control resonance frequency and output power of induction heating coil. Induction heating coil can be controlled by single phase sinusoidal pulse width modulation (SPWM) inverter .All electrical requirements beside magnetic permeability and resistivity variation for modeling induction heating coil have been considered to make simulations practical .Control ...

the determination of the optimal distribution of the catalytic activity profile, whichmaximizes the catalytic effectiveness, in created unsteady state conditions, is analyzed andtreated numerically for the case of a simple reaction. it was proven that the modulation, of thetemperature and the reactant concentration of the external bulk fluid, leads to a considerableincrease of the catalytic eff...