WSJT-X/lib/fsk4hf/ft8_params.f90

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! LDPC (168,84) code
parameter (KK=84) !Information bits (72 + CRC12)
parameter (ND=56) !Data symbols
parameter (NS=21) !Sync symbols (3 @ Costas 7x7)
parameter (NN=NS+ND) !Total symbols (77)
parameter (NSPS=2048) !Samples per symbol at 12000 S/s
parameter (N7=7*NSPS) !Samples in Costas 7x7 array (14,336)
parameter (NZ=NSPS*NN) !Samples in full 15 s waveform (157,696)
parameter (NMAX=15*12000) !Samples in iwave (180,000)
parameter (NFFT1=1*NSPS, NH1=NFFT1/2) !Length of FFTs for symbol spectra