mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-08-24 15:16:36 -04:00
17 lines
976 B
Fortran
17 lines
976 B
Fortran
! FT4
|
|
! LDPC(174,91) code, four 4x4 Costas arrays for sync, ramp-up and ramp-down symbols
|
|
|
|
parameter (KK=91) !Information bits (77 + CRC14)
|
|
parameter (ND=87) !Data symbols
|
|
parameter (NS=16) !Sync symbols
|
|
parameter (NN=NS+ND) !Sync and data symbols (103)
|
|
parameter (NN2=NS+ND+2) !Total channel symbols (105)
|
|
parameter (NSPS=576) !Samples per symbol at 12000 S/s
|
|
parameter (NZ=NSPS*NN) !Sync and Data samples (59328)
|
|
parameter (NZ2=NSPS*NN2) !Total samples in shaped waveform (60480)
|
|
parameter (NMAX=21*3456) !Samples in iwave (72576)
|
|
parameter (NFFT1=2304, 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=18) !Downsample factor
|