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17 lines
996 B
Fortran
17 lines
996 B
Fortran
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! FT4A
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! LDPC(240,101)/CRC24 code, four 4x4 Costas arrays for sync, ramp-up and ramp-down symbols
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parameter (KK=77) !Information bits (77 + CRC24)
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parameter (ND=120) !Data symbols
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parameter (NS=24) !Sync symbols
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parameter (NN=NS+ND) !Sync and data symbols (144)
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parameter (NN2=NS+ND+2) !Total channel symbols (146)
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parameter (NSPS=9600) !Samples per symbol at 12000 S/s
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parameter (NZ=NSPS*NN) !Sync and Data samples (1,382,400)
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parameter (NZ2=NSPS*NN2) !Total samples in shaped waveform (1,397,760)
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parameter (NMAX=408*3456) !Samples in iwave (1,410,048)
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parameter (NFFT1=4*NSPS, NH1=NFFT1/2) !Length of FFTs for symbol spectra
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parameter (NSTEP=NSPS) !Coarse time-sync step size
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parameter (NHSYM=(NMAX-NFFT1)/NSTEP) !Number of symbol spectra (1/4-sym steps)
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parameter (NDOWN=32) !Downsample factor
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