- For the musical use of "modulation", see modulation (music).
Modulation describes a range of techniques for encoding information on a carrier signal, typically a sine-wave signal. A device that performs modulation is known as a modulator.
Modulation techniques include:
When OFDM is used in conjunction with channel coding techniques, it is described as Coded orthogonal frequency division modulation (COFDM).
Pulse modulation techniques include:
When transmitting digital data, modulation normally involves shifting one or more properties of the carrier wave between a set of states, a process referred to as keying. This type of modulation includes:
The use of on-off keying to transmit Morse code at radio frequencies is known as continuous wave (CW) operation.
Modulation is frequently used in conjunction with various channel access methods.
See also
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