WSJT-X/lib/fsk4hf/ft4s280_params.f90

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! FT4S280
! LDPC(280,101)/CRC24 code, six 4x4 Costas arrays for sync, ramp-up and ramp-down symbols
parameter (KK=77) !Information bits (77 + CRC24)
parameter (ND=140) !Data symbols
parameter (NS=24) !Sync symbols
parameter (NN=NS+ND) !Sync and data symbols (164)
parameter (NN2=NS+ND+2) !Total channel symbols (166)
parameter (NSPS=8400) !Samples per symbol at 12000 S/s
parameter (NZ=NSPS*NN) !Sync and Data samples (1,377,600)
parameter (NZ2=NSPS*NN2) !Total samples in shaped waveform (1,394,400)
parameter (NMAX=408*3456) !Samples in iwave (1,410,048)
parameter (NFFT1=4*NSPS, NH1=NFFT1/2) !Length of FFTs for symbol spectra
parameter (NSTEP=NSPS) !Coarse time-sync step size
parameter (NHSYM=(NMAX-NFFT1)/NSTEP) !Number of symbol spectra (1/4-sym steps)
parameter (NDOWN=28) !Downsample factor