RF modulation techniques, java applets

Amplitude modulation amplitude modulation was the original method used for transmitting audio signals over radio frequency waves. It is still used today in AM radio. This applet demonstrates the modulation process

Amplitude modulation 2 The applet shows an amplitude modulated signal

Amplitude modulation 3 simulation of AM

AM-FM modulation - AM demodulation in amplitude modulation the amplitude of a slowly varying signal is impressed onto the amplitude of a rapidly varying signal

Démodulation d'amplitude

Double sideband modulation double sideband modulation, DSB, Educypedia

Double side band Suppressed Carrier System (DSB/SC)

FDM: Frequency Devision Multiplex

FM spectra the spectrum generated by an FM pair centers on the carrier frequency, with sidebands found at multiples of the modulating frequency added and subtracted from the carrier. The power at each sideband is determined by the index of modulation (modAmp/modFreq) and a Bessel function, Frequency modulation and Bessel functions

Foxhole Radio What is the Foxhole Radio? What are the Components?

Frequency and Phase Modulation

Frequency modulation Frequency modulation is the process of varying the frequency of a carrier wave in proportion to the instantaneous amplitude of the modulating signal, ...

Frequency modulation in frequency modulation the amplitude is kept constant and the frequency is modulated by the amplitude of the modulating signal

Frequency modulation and Bessel functions the spectrum of a frequency modulated signal must be determined using Bessel functions

Frequency modulation fundamentals

Frequency modulation frequency modulation, FM

Modulation AM Italian

Modulation AM et FM en Français

Modulations d'amplitude et de fréquence en Français

Modulation d'amplitude en Français

Modulation FM Italian

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

Phase and Frequency Modulation Phase and Frequency Modulation, To give an overview of two angle modulation methods (phase modulation and frequency modulation)

Phase Modulation Phase Modulation, PM

Power Content of Frequency Modulation and Phase Modulation This Demonstration illustrates frequency modulation (FM) and phase modulation (PM) using one sinusoidal tone as the modulating signal

Power Efficiency Of Amplitude Modulation This Demonstration illustrates the effect of changing the modulation factor (also called the modulation depth) on the power efficiency of ordinary amplitude modulation (AM) technique. A modulation factor greater than 1 results in envelope distortion, causing difficulties during demodulation

Single side band demodulation in single-side-band demodulation, the carrier is reinserted before the modulation signal is extracted using envelope detection. The amplitude of the reinserted carrier determines how close the demodulated signal is to the original modulating signal

Single sideband modulation single sideband modulation, SSB

Single Side band suppressed Carrier (SSB/SC) Filter method of producing SSB/SC signals

Spectre d'un signal modulé en amplitude en Français

Spectre d'un signal modulé en fréquence en Français

Horizontaal

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 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

Codage d'information sur un canal de transmission

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

Hamming code

Huffman tree

IQ modulation IQ modulation, "I" is the "in-phase" component of the waveform, and "Q" represents the quadrature component

Modulateur à quadrature en Français

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

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)

Wavelet compression

Horizontaal

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