mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-06 01:11:18 -05:00
17 lines
996 B
Fortran
17 lines
996 B
Fortran
! FT4A
|
|
! LDPC(240,101)/CRC24 code, four 4x4 Costas arrays for sync, ramp-up and ramp-down symbols
|
|
|
|
parameter (KK=77) !Information bits (77 + CRC24)
|
|
parameter (ND=120) !Data symbols
|
|
parameter (NS=24) !Sync symbols
|
|
parameter (NN=NS+ND) !Sync and data symbols (144)
|
|
parameter (NN2=NS+ND+2) !Total channel symbols (146)
|
|
parameter (NSPS=9600) !Samples per symbol at 12000 S/s
|
|
parameter (NZ=NSPS*NN) !Sync and Data samples (1,382,400)
|
|
parameter (NZ2=NSPS*NN2) !Total samples in shaped waveform (1,397,760)
|
|
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=32) !Downsample factor
|