Introduction - If you have any usage issues, please Google them yourself
1. First Run 2_28_1 run 3_3_1 judge PSK modulation scheme to obtain accurate frequency offset and symbol rate (here only for QPSK) 2. depending on the exact carrier frequency and symbol rate matched filtering operation 3_3_2 3_3_2 be QPSK demodulator 3. 4. Not given signal