- quadratural-amplitude modulation
- квадратурно-амплитудная модуляция
English-Russian dictionary of modern telecommunications. 2003.
English-Russian dictionary of modern telecommunications. 2003.
Optical hybrid — A 90° optical hybrid is a six port device that is used for coherent signal demodulation for either homodyne or heterodyne detection. It would mix the incoming signal with the four quadratural states associated with the reference signal in the… … Wikipedia