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15 lines
813 B
Fortran
15 lines
813 B
Fortran
! FT4 37.5 baud - 26.67 ms symbol duration
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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=64) !Data symbols
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parameter (NS=12) !Sync symbols (12)
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parameter (NN=NS+ND) !Total channel symbols (76)
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parameter (NSPS=320) !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=2.5*12000) !Samples in iwave (36,000)
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parameter (NFFT1=640, 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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