QPSK
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Quadrature Phase Shift Keying (QPSK) is a method to transmit digital information on a carrier by changing the phase of the carrier. In QPSK there are 4 different phase changes defined, each phase change represents the transmission of 2 bits. An example of phase change and the bits it represents is given in the table below.
| Symbol |
Phase change |
| 00 |
0 degrees |
| 01 |
90 degrees |
| 11 |
180 degrees |
| 10 |
270 degrees |
QPSK is used in a number of communication and broadcasting systems, e.g. DVB-S.