Differential quadrature phase shift keying (DQPSK) is an important modulation format for next-generation 40G optical transport systems. It has excellent tolerance against chromatic dispersion, PMD, ...

The most basic forms of digital modulation are amplitude shift keying (ASK), frequency shift keying (FSK), and phase shift keying (PSK).

Just like it says on the tin, it’s phase shift keying, and a proper implementation uses a phase detection circuit or something similar.

Binary FSK(Frequency Shift Keying) and PSK(Phase Shift keying) are extensively used in telecommunication for digital data transmission. FSK/PSK modulator circuits usually employ analogue components ...

A-BPSK aviation binary phase shift keying—a form of phase-shift keyed modulation with shaped filters especially adapted to perform in an RF environment subject to fading A-QPSK aeronautical ...

Binary FSK (Frequency Shift Keying) and PSK (Phase Shift keying) are extensively used in telecommunication for digital data transmission. FSK/PSK modulator circuits usually employ analogue components ...