The principle of quaternary phase modulation
Four-phase absolute phase modulation (4BPSK): The relationship between the two-bit code ak, bk and the carrier phase is shown in the following table
2. Phase modulation method to generate 4BPSK signal
Schematic diagram of in-phase code sequence mI(t) and positive code sequence mQ(t) waveform
m(t) is transformed into parallel bipolar sequences mI(t) and mQ(t)
The agreement is phase
The absolute four-phase phase modulation logic process is shown in Table 6-3:
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