Digital Modulation Techniques, java applets and animations

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

OFDM 20 MHz

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

Horizontaal

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