On-Off Keying (OOK)
On-off keying (OOK) is a modulation scheme that consists of keying a sinusoidal carrier signal on and off with a unipolar binary signal. OOK is equivalent to two-level amplitude-shift keying (ASK).
![](noloc_OOK1.gif)
Unipolar Binary Baseband Signal
![](noloc_OOK.gif)
Resulting OOK Modulated Signal