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Digital Modulation Techniques 
16-QAM 16 QAM with noise, Quadrature amplitude modulation (QAM) is a modulation scheme in which two sinusoidal carriers, one exactly 90 degrees out of phase with respect to the other, are used to transmit data over a given physical channel.
ADSL transmission applet QAM, ADSL-like transmissions, basically ADSL uses multiple carrier modulation : multiple QAM (Quadrature Amplitude modulation)
Amplitude Shift Keying Amplitude Shift Keying modulation technique
Calcul du CRC 16 swf file, en Français
CDMA Code division multiple access (CDMA) is a channel access method utilized by various radio communication technologies
CDMA Coding This applet demonstrates CDMA multiple access coding and allows the user to see the process of coding and decoding in real time
CDMA transmission a Java applet simulates here multiple bit transmissions on the same communication link. The receiver extracts one of the transmitter messages from the transmitted signal by a correlation computation with the tranmitter code which is assumed known
Codage des signaux binaires swf file, en Français
Digital Modulation Techniques Amplitude modulation, Frequency modulation, Quadrature Amplitude Modulation, Phase Shift Modulation
Eye Diagram The Eye Diagram Demonstration (further referenced as EDD) is a Java applet to demonstrate the construction of the so called eye diagram. The application is based on Sun Microsystems’ Java Technology.
Frequency Shift Keying FSK modulation, Frequency shift keying employs two different carrier frequencies which are switched ON and OFF alternately by the mark and space signal
Huffman tree
IQ modulation
IQ modulation IQ modulation, "I" is the "in-phase" component of the waveform, and "Q" represents the quadrature component
Modulateur à quadrature en Français
Modulation Techniques digital modulation techniques: digital signal: AM, FM, PM
Modulation Techniques The following simulation will show the waveform generated by different modulation techniques: digital modulation, frequency modulation, FM, amplitude modulation, AM, Combinations of AM and PSM, Quadrature Amplitude Modulation, phase shift modulation
OFDM modulation The purpose of this tutorial is to give a simple introduction to Orthogonal Frequency Division Multiplexing, binary phase shift keying (BPSK) modulation
PAM, PPM, PDM, PWM Pulse Amplitude Modulation (PAM), Pulse Position Modulation (PPM), Pulse Duration Modulation (PDM), Pulse Width Modulation (PWM), PCM
PAM PAM: pulse amplitude modulation
PCM Converting Analog Signals to Digital Signals using Pulse Code Modulation
Phase Shift Keying (PSK) Phase Shift Keying (PSK), In PSK, the mark and space signals are represented by 180º phase shift and zero phase shift respectively
Pulse Code Modulation Pulse Code Modulation, PCM
Pulse position modulation a PPM signal and how it changes with amplitude and frequency of the modulating signal
Pulse width modulation this form of modulation is often used in control applications as the average value is proportional to the pulse width
Pulse Width Modulation Principle This Demonstration generates a graphical representation of pulse width modulation (PWM) used for variable frequency AC motor drives (VFDs). The carrier frequency signal is illustrated in blue while the reference signal (sine wave) is green
QAM QAM takes advantage of the fact that the greater the number of symbols, the greater the efficiency of the system. Occupied bandwidth is determined, mostly, by the symbol rate. So the more bits (the fundamental information units) per symbol, the higher the efficiency. The number of symbols required for a given system is 2n, where n is the number of bits per symbol. For 16 QAM, n = 4 and there are 16 symbols–each symbol represents four bits: 0000, 0001, 0010
QAM Quadrature Amplitude Modulation, QAM
QPSK signal on a spectrum analyzer Spectrum analyzer and QPSK, QPSK signal
Quadrature Amplitude Modulation combinations of AM and PSM are used in Quadrature Amplitude Modulation
Signal Processing for Cellular Communication Systems Data Flow Diagram, Amplitude Shift Keying, Frequency Shift Keying, Phase Shift Keying, Quadrature Amplitude Modulation, Flat fading, Multi-path fading
Time Division Multiplexing (TDM) Time Division Multiplexing (TDM)
Time Division Multiplexing (TDM) Time Division Multiplexing (TDM), Synchronous Time Division Multiplexing
Time Division Multiplexing
Wavelet compression

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Last updated on: 2011-01-02 | Copyright © 2011-2013 Educypedia.