Digital modulation

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  Frequency modulation

  In telecommunications, frequency modulation (FM) conveys information over a carrier wave by varying its frequency (contrast this with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant). In analog applications, the instantaneous frequency of...
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  Multiple frequency-shift keying

  Multiple frequency-shift keying (MFSK) is a variation of frequency-shift keying (FSK) that uses more than two frequencies. MFSK is a form of M-ary orthogonal modulation, where each symbol consists of one element from an alphabet of orthogonal waveforms. M, the size of the alphabet, is usually a...
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  Amplitude modulation

  Amplitude modulation (AM) is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. AM works by varying the strength of the transmitted signal in relation to the information being sent. For example, changes in the signal strength can be...

• Continuous-phase frequency-shift keying

  Continuous-phase frequency-shift keying (CPFSK) is a commonly-used variation of frequency-shift keying (FSK), which is itself a special case of analog frequency modulation. FSK is a method of modulating digital data onto a sinusoidal carrier wave, encoding the information present in the data to...

• Quadrature modulation

  Quadrature modulation is the general technique of modulating two carriers. Examples include Quadrature amplitude modulation, Phase-shift keying, and Minimum-shift keying. Constellation diagrams are used to examine the modulation in the 2-D signal space. Sending a signal by amplitude modulation...