1! LDPC (128,90) code
2parameter (KK=90)                     !Information bits (77 + CRC13)
3parameter (ND=128)                    !Data symbols
4parameter (NS=16)                     !Sync symbols (2x8)
5parameter (NN=NS+ND)                  !Total channel symbols (144)
6parameter (NSPS=160)                  !Samples per symbol at 12000 S/s
7parameter (NZ=NSPS*NN)                !Samples in full 1.92 s waveform (23040)
8parameter (NMAX=30000)                !Samples in iwave (2.5*12000)
9parameter (NFFT1=400, NH1=NFFT1/2)    !Length of FFTs for symbol spectra
10parameter (NSTEP=NSPS/4)              !Rough time-sync step size
11parameter (NHSYM=NMAX/NSTEP-3)        !Number of symbol spectra (1/4-sym steps)
12parameter (NDOWN=16)                  !Downsample factor
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