This video provides an introduction to the basic concepts of phase shift keying as well as offset and differential phase shift keying.

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Timeline:
00:00 Introduction
00:11 About phase shift keying
00:52 Binary phase shift keying
01:22 PSK constellation diagrams
02:07 QPSK (quadrature phase shift keying)
02:57 Higher order PSK
03:38 Avoiding the origin
04:38 Offset PSK
05:15 QPSK vs. OQPSK
05:30 Differential PSK
06:30 QPSK vs. Pi/4 DQPSK
06:42 Applications of offset and differential PSK
07:17 Summary