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