Inverters inherently have the property of controlling output frequency but the output voltage can’t be varied. Usually to vary output voltage we have to vary supply voltage which is not always possible for this reason PWM techniques gained momentum. Basic aim of PWM technique is to control output voltage and harmonic reduction. Pulse-width modulation (PWM), or pulseduration modulation (PDM), is...

This paper presents application of the low Duty Cycle Ratio (DCR) modulations: isochronous Digital Pulse Position Modulation (DPPM) and anisochronous Digital Pulse Interval Modulation (DPIM) in backscatter based passive RFID communication system. The proposed modulations are compared to commonly used Amplitude Shift Keying (ASK) modulation. Low DCR modulations are customized for data transmissi...

In this paper, we present the design of complex Ultra-wideband (UWB) pulses which enables the phase-shift keying (PSK) modulation for UWB Impulse Radio (IR) Communications. Two classes of complex UWB pulses are proposed based on complex Gaussian wavelets and complex rational orthogonal wavelets respectively. Formulas in closed form are derived for a full control of the time and frequency proper...

Abstract Laser-induced acoustic (LIA) technology is a possible way of communicating from an air platform to underwater target. The present paper describes modulation method n-multiple frequency shift keying (n-MFSK) used for improving the communication rate LIA technology. thermal expansion mechanism was selected as generating signal by pulse laser in this work. Thus, pulsed repetition (PRF) ca...

The fundamental concepts and challenges of orthogonal time frequency space (OTFS) modulation have been reviewed in Part I this three-part tutorial. In second part, we provide an overview the state-of-the-art transceiver designs for OTFS systems, with a particular focus on cyclic prefix (CP) design, window pulse shaping, channel estimation, signal detection. Furthermore, analyze performance modu...