(Redirected from
Modulator)
- 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
External links
