Differential phase shift keying (DPSK) is a digital modulation scheme that encodes data in the phase of a carrier signal. In DPSK, the phase of the carrier signal is changed to represent each data bit. The advantage of DPSK over other digital modulation schemes is that it does not require a linear amplifier, which simplifies receiver design.
DPSK can be used to transmit data over long distances without distortion. This makes it ideal for applications such as fiber optic communication systems. DPSK has also been used in wireless communication systems, where it can provide immunity to multipath fading and interference.
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