WSJT-X/lib/ft4/ft4_params.f90

! 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
Change ft4 to use (174,91) code and 512 Sa/symbol. 2019-01-27 00:03:54 -05:00			`! FT4`
Update some comments, delete obsolete files. 2019-06-05 11:17:59 -04:00			`! LDPC(174,91) code, four 4x4 Costas arrays for sync, ramp-up and ramp-down symbols`
Add ft4 files; ft4sim works, ft4d is work in progress. 2019-01-21 20:31:54 -05:00
Change ft4 to use (174,91) code and 512 Sa/symbol. 2019-01-27 00:03:54 -05:00			`parameter (KK=91) !Information bits (77 + CRC14)`
			`parameter (ND=87) !Data symbols`
			`parameter (NS=16) !Sync symbols`
More code cleanup -- just comments and formatting. 2019-01-30 12:22:41 -05:00			`parameter (NN=NS+ND) !Sync and data symbols (103)`
			`parameter (NN2=NS+ND+2) !Total channel symbols (105)`
FT4: Change Fortran code to NSPS=576 and make necessary accompanying changes on the C++ side. Basically works except that Tx audio has incorrect DT and audio is truncated at the end. Also, command line decoding using JT9 is not as sensitive as decoding from within WSJT-X. 2019-05-22 18:02:15 -04:00			`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`
New scheme for finding candidates. Speed up sync. Improved SNR calibration. 2019-02-02 17:29:17 -05:00			`parameter (NSTEP=NSPS) !Coarse time-sync step size`
			`parameter (NHSYM=(NMAX-NFFT1)/NSTEP) !Number of symbol spectra (1/4-sym steps)`
FT4: Change Fortran code to NSPS=576 and make necessary accompanying changes on the C++ side. Basically works except that Tx audio has incorrect DT and audio is truncated at the end. Also, command line decoding using JT9 is not as sensitive as decoding from within WSJT-X. 2019-05-22 18:02:15 -04:00			`parameter (NDOWN=18) !Downsample factor`