phase-and-amplitude modulation
Determination of electrostatic force and its characteristics based on phase difference by amplitude modulation atomic force microscopy
... oscillation phase difference by amplitude modulation atomic force ...the phase difference obtained from the experiment, the quantitative dependence of the absolute magnitude of the ...
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DESIGN OF SIMULINK MODEL FOR OFDM AND COMPARISON OF FFT- OFDM AND DWT-OFDM.
... To generate a baseband OFDM symbol, a serial digitized data stream is first channel coded and then modulated using phase shift keying (PSK) or quadrature amplitude modulation (QAM). These data ...
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Fourier Transform And Its Application In Modulation Techniques
... through modulation i.e. amplitude modulation (AM), frequency modulation (FM) or phase modulation ...of modulation, demodulation and Fourier Transform need to be explored ...
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Three-Dimension Carrierless Amplitude Phase Modulation (3-D CAP) Performance Analysis using MATLAB Simulink
... order modulation formats so-called CAP has been proposed for copper wires as early as ...quadrature amplitude modulation (QAM), both CAP and QAM supports multiple ...CAP modulation has ...
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OFDM in Free Space Optical Communication System
... frequency, amplitude, phase, and ...are amplitude modulation with direct detection and phase modulation in combination with a homodyne or heterodyne ...digital modulation ...
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Performance of OFDM System with Constant Amplitude Modulation
... duces the PAPR value from 8.8 dB for conventional OFDM system to 1.5 dB. While in [20], a novel multi- carrier spread spectrum watermarking scheme for the application of image error concealment using multicar- rier-code ...
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Simulation of High Data Rate Transmission over Optical Cable Channels Using OFDM/OQAM Modulation
... Figure 1 shows the architecture of proposed system. Orthogonal Frequency Division Multiplexing (OFDM) is a special type of multicarrier modulation with densely spaced sub carriers and overlapping spectra. The ...
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Evaluation of SNR for AWGN, Rayleigh and Rician Fading Channels Under DPSK Modulation Scheme with Constant BER
... as Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), Phase Shift Keying (PSK), Differential Phase shift Keying (DPSK) and Quadrature Amplitude Modulation (QAM) are very ...
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Optical System Design of Telescope Based on Mixed Modulation Diffractive Lens
... rector, respectively, η is the magnification of the Reimager. So far, many dif- fraction devices, including Fresnel Zone Plate, phase Fresnel lens and photon sieves, have been used as Magnifying Glass [6] [7] [8]. ...
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Fuzzy inference system based adaptive modulation scheme for optical wireless communication
... a modulation technique is one of the key technical decisions in the design of any communication ...particular modulation technique is assessed are highlighted optical power efficiency and bandwidth ...
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Optical gas sensors based on correlation spectroscopy using a Fabry Perot interferometer
... background amplitude in gas sensors using an FPI as a modulator in a form of correlation based device has been analysed in section ...background modulation, because the FT of these filters has high ...
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Three-phase AC-AC hexagonal chopper system with heterodyne modulation for power flow control enhancement
... Abstract—This paper proposes a three-phase AC chopper system for the interconnection of various distributed generation (DG) farms or main utilities to enhance the active and reactive power flow control. The ...
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Waveform Discrimination in the Electric Fish Eigenmannia: Sensitivity for the Phase Differences Between the Spectral Components of a Stimulus Wave
... If the stimulus field is of 30% amplitude compared to the fish's own field, the depth of the phase modulation of the combined fields left versus right reaches the remarkable value of up [r] ...
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New Approach for Network Modulation in Cooperative Communication
... network modulation is applicable and desirable in many scenarios with the minimum of at least three nodes should be in the wireless ...network modulation, there can be generate other more NM schemes, which ...
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1 25 Gbps and 2 5 Gbps data rate transmission of 2D CAP modulation for access network
... CAP modulation (2D-CAP), shaping filters use the properties of a well- known square-root raised cosine (SRRC) filter with zero- ISI, merged with the orthogonal properties of sine and cosine waveforms that has ...
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Adaptive differential amplitude pulse position modulation technique (DAPPM) using fuzzy logic for optical wireless communication channels
... position modulation (PPM) requires the least average optical power compared to other modulation schemes in line-of-sight links but suffer severely in diffused ...
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Design And Development Of Software Defined Radio
... This project is to design and develop a Software Defined Radio that using implements the coding technique and modulation scheme (Quadrature Amplitude Modulation (QAM) with Orthogonal Frequency ...
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A Study on FPGA Based Digital Modulators
... digital modulation scheme will significantly affect the characteristics and performance of a communication ...frequency, phase, amplitude or a combination of ...resultant modulation on ...
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High dimensionality carrierless amplitude phase modulation technique for radio over fiber system
... (2D-CAP) modulation, shaping filters use the property of a square-root raised cosine (SRRC) filter with zero-ISI, merged with the orthogonal property of sine and cosine waveforms that has ...
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Comparative Study of Digital Modulation Techniques Using MATLAB
... digital modulation provides more information capacity, compatibility with digital data services, higher data security, better quality communications, and quicker system ...digital modulation techniques used ...
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