WSJT-X/lib/ft8/ft8_params.f90

! LDPC (174,91) code
parameter (KK=91)                     !Information bits (77 + CRC14)
parameter (ND=58)                     !Data symbols
parameter (NS=21)                     !Sync symbols (3 @ Costas 7x7)
parameter (NN=NS+ND)                  !Total channel symbols (79)
parameter (NSPS=1920)                 !Samples per symbol at 12000 S/s
parameter (NZ=NSPS*NN)                !Samples in full 15 s waveform (151,680)
parameter (NMAX=15*12000)             !Samples in iwave (180,000)
parameter (NFFT1=2*NSPS, NH1=NFFT1/2) !Length of FFTs for symbol spectra
parameter (NSTEP=NSPS/4)              !Rough time-sync step size
parameter (NHSYM=NMAX/NSTEP-3)        !Number of symbol spectra (1/4-sym steps)
parameter (NDOWN=60)                  !Downsample factor
Fix an egregious bug and another not-so-egregious bug. The egregious bug prevented decodes of most signals with negative DT. 2018-12-03 08:18:52 -05:00			`! LDPC (174,91) code`
			`parameter (KK=91) !Information bits (77 + CRC14)`
First bare-bones decoder for FT8. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7716 ab8295b8-cf94-4d9e-aec4-7959e3be5d79 2017-06-14 16:21:01 -04:00			`parameter (ND=58) !Data symbols`
Some test routines. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7712 ab8295b8-cf94-4d9e-aec4-7959e3be5d79 2017-06-13 15:42:45 -04:00			`parameter (NS=21) !Sync symbols (3 @ Costas 7x7)`
Various tweaks to test routines. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7720 ab8295b8-cf94-4d9e-aec4-7959e3be5d79 2017-06-15 10:58:59 -04:00			`parameter (NN=NS+ND) !Total channel symbols (79)`
FT8 now uses nsps=1920. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7784 ab8295b8-cf94-4d9e-aec4-7959e3be5d79 2017-07-06 09:38:06 -04:00			`parameter (NSPS=1920) !Samples per symbol at 12000 S/s`
			`parameter (NZ=NSPS*NN) !Samples in full 15 s waveform (151,680)`
Some test routines. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7712 ab8295b8-cf94-4d9e-aec4-7959e3be5d79 2017-06-13 15:42:45 -04:00			`parameter (NMAX=15*12000) !Samples in iwave (180,000)`
First bare-bones decoder for FT8. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7716 ab8295b8-cf94-4d9e-aec4-7959e3be5d79 2017-06-14 16:21:01 -04:00			`parameter (NFFT1=2*NSPS, NH1=NFFT1/2) !Length of FFTs for symbol spectra`
Use quarter-symbol steps for time sync. Lower sync threshold. Implement subtraction and two pass decoding. Use osd2 only near nfqso. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7861 ab8295b8-cf94-4d9e-aec4-7959e3be5d79 2017-07-12 17:49:39 -04:00			`parameter (NSTEP=NSPS/4) !Rough time-sync step size`
Fix a comment. No code changes. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7863 ab8295b8-cf94-4d9e-aec4-7959e3be5d79 2017-07-12 20:31:52 -04:00			`parameter (NHSYM=NMAX/NSTEP-3) !Number of symbol spectra (1/4-sym steps)`
Minor tweaks for code cleanup. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7786 ab8295b8-cf94-4d9e-aec4-7959e3be5d79 2017-07-06 10:19:39 -04:00			`parameter (NDOWN=60) !Downsample factor`