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71 lines
2.3 KiB
Fortran
71 lines
2.3 KiB
Fortran
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subroutine decode_sf(iwave)
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use sfox_mod
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integer*2 iwave(NMAX)
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integer msg1(0:47)
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integer, allocatable :: rxdat(:)
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integer, allocatable :: rxprob(:)
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integer, allocatable :: rxdat2(:)
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integer, allocatable :: rxprob2(:)
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integer, allocatable :: correct(:)
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real a(3)
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real, allocatable :: s3(:,:) !Symbol spectra: will be s3(NQ,NN)
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complex crcvd(NMAX)
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integer isync(24) !Symbol numbers for sync tones
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data isync/ 1, 2, 4, 7,11,16,22,29,37,39, &
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42,43,45,48,52,57,63,70,78,80, &
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83,84,86,89/
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! Temporary, for initial tests:
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data msg1/ 5, 126, 55, 29, 5, 127, 86, 117, 6, 0, &
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118, 77, 6, 2, 22, 37, 6, 3, 53, 125, &
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1, 27, 124, 110, 54, 12, 9, 43, 43, 64, &
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96, 94, 85, 92, 6, 7, 21, 5, 104, 48, &
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67, 37, 110, 67, 4, 106, 26, 64/
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mm0=7 !Symbol size (bits)
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nn0=127 !Number of information + parity symbols
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kk0=48 !Number of information symbols
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fspread=0.0
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delay=0.0
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fsample=12000.0 !Sample rate (Hz)
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ns0=24 !Number of sync symbols
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call sfox_init(mm0,nn0,kk0,'no',fspread,delay,fsample,ns0)
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! Allocate storage for arrays that depend on code parameters.
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allocate(s3(0:NQ-1,0:NN-1))
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allocate(rxdat(0:NN-1))
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allocate(rxprob(0:NN-1))
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allocate(rxdat2(0:NN-1))
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allocate(rxprob2(0:NN-1))
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allocate(correct(0:NN-1))
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call rs_init_sf(MM,NQ,NN,KK,NFZ) !Initialize the Karn codec
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call sfox_ana(iwave,NMAX,crcvd,NMAX)
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call sfox_sync(iwave,fsample,isync,f,t,fwidth) !Find freq, DT, width
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a=0.
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a(1)=1500.0-f - baud !Shift frequencies down by one bin
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call twkfreq(crcvd,crcvd,NMAX,fsample,a)
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f=1500.0
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call sfox_demod(crcvd,f,t,isync,s3) !Get s3(0:NQ-1,0:127)
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call sfox_prob(s3,rxdat,rxprob,rxdat2,rxprob2)
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do i=0,KK-1
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write(60,3060) i,msg1(i),rxdat(i),rxprob(i),rxdat2(i),rxprob2(i)
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3060 format(6i8)
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enddo
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ntrials=1000
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call ftrsd3(s3,rxdat,rxprob,rxdat2,rxprob2,ntrials, &
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correct,param,ntry)
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if(ntry.lt.ntrials) then
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print*,'A',ntry,count(rxdat(0:KK-1).ne.msg1),count(correct(0:KK-1).ne.msg1)
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call sfox_unpack(correct(0:KK-1))
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endif
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return
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end subroutine decode_sf
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