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:
Where the signal is a simple low speed on-off indication, as in morse code or radioteletype (RTTY) transmission, modulation is often known as 'keying' as in the terms
Where Morse code is used to turn the carrier wave on and off, the term used is not 'amplitude keying', but 'continuous wave' (CW) operation.
Modulation is frequently used in conjunction with various [channel access method]?s, such as
Where these methods are used for dividing forward and reverse communication channels, they are known as duplexing methods, such as:
See also: