2020-12-26 10:08:53 -05:00
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module q65
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2021-01-13 10:23:38 -05:00
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parameter (NSTEP=8) !Time bins per symbol, in s1() and s1a()
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parameter (PLOG_MIN=-240.0) !List decoding threshold
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2020-12-26 10:08:53 -05:00
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integer nsave,nlist,LL0
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integer listutc(10)
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2020-12-30 15:40:06 -05:00
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integer apsym0(58),aph10(10)
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2020-12-27 15:27:26 -05:00
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integer apmask(13),apsymbols(13)
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2021-01-13 10:44:19 -05:00
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integer,dimension(22) :: isync = (/1,9,12,13,15,22,23,26,27,33,35, &
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38,46,50,55,60,62,66,69,74,76,85/)
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2021-01-13 10:23:38 -05:00
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integer codewords(63,206)
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2021-01-13 11:29:33 -05:00
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integer navg,ibwa,ibwb,ncw,nsps,mode_q65,istep,nsmo
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2021-01-13 10:44:19 -05:00
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real,allocatable,save :: s1a(:,:) !Cumulative symbol spectra
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2021-01-13 10:55:01 -05:00
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real sync(85) !sync vector
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2020-12-26 10:08:53 -05:00
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2021-01-09 19:58:34 -05:00
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contains
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subroutine q65_clravg
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2021-01-13 10:23:38 -05:00
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s1a=0.
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navg=0
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2021-01-09 19:58:34 -05:00
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return
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end subroutine q65_clravg
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2021-01-13 11:44:29 -05:00
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subroutine q65_symspec(iwave,nmax,iz,jz,s1)
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integer*2 iwave(0:nmax-1) !Raw data
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real s1(iz,jz)
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complex, allocatable :: c0(:) !Complex spectrum of symbol
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allocate(c0(0:nsps-1))
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nfft=nsps
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fac=1/32767.0
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do j=1,jz !Compute symbol spectra at step size
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i1=(j-1)*istep
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i2=i1+nsps-1
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k=-1
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do i=i1,i2,2 !Load iwave data into complex array c0, for r2c FFT
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xx=iwave(i)
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yy=iwave(i+1)
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k=k+1
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c0(k)=fac*cmplx(xx,yy)
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enddo
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c0(k+1:)=0.
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call four2a(c0,nfft,1,-1,0) !r2c FFT
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do i=1,iz
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s1(i,j)=real(c0(i))**2 + aimag(c0(i))**2
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enddo
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! For large Doppler spreads, should we smooth the spectra here?
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do i=1,nsmo
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call smo121(s1(1:iz,j),iz)
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enddo
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enddo
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s1a=s1a+s1
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navg=navg+1
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return
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end subroutine q65_symspec
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subroutine q65_dec_q3(df,s1,iz,jz,ia,lag1,lag2,i0,j0,ccf,ccf1,ccf2, &
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ia2,s3,LL,snr2,dat4,idec,decoded)
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character*37 decoded
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integer itone(85)
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integer ijpk(2)
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integer dat4(13)
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real ccf(-ia2:ia2,-53:214)
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real ccf1(-ia2:ia2)
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real ccf2(-ia2:ia2)
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real s1(iz,jz)
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real s3(-64:LL-65,63)
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ipk=0
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jpk=0
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ccf_best=0.
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imsg_best=-1
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do imsg=1,ncw
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i=1
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k=0
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do j=1,85
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if(j.eq.isync(i)) then
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i=i+1
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itone(j)=-1
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else
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k=k+1
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itone(j)=codewords(k,imsg)
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endif
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enddo
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! Compute 2D ccf using all 85 symbols in the list message
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ccf=0.
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iia=200.0/df
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do lag=lag1,lag2
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do k=1,85
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j=j0 + NSTEP*(k-1) + 1 + lag
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if(j.ge.1 .and. j.le.jz) then
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do i=-ia2,ia2
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ii=i0+mode_q65*itone(k)+i
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if(ii.ge.iia .and. ii.le.iz) ccf(i,lag)=ccf(i,lag) + s1(ii,j)
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enddo
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endif
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enddo
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enddo
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ccfmax=maxval(ccf(-ia:ia,:))
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if(ccfmax.gt.ccf_best) then
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ccf_best=ccfmax
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ijpk=maxloc(ccf(-ia:ia,:))
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ipk=ijpk(1)-ia-1
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jpk=ijpk(2)-53-1
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f0=nfqso + (ipk-mode_q65)*df
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xdt=jpk*dtstep
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imsg_best=imsg
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ccf1=ccf(:,jpk)
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endif
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enddo ! imsg
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i1=i0+ipk-64
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i2=i1+LL-1
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j=j0+jpk-7
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n=0
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do k=1,85
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j=j+8
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if(sync(k).gt.0.0) then
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cycle
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endif
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n=n+1
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if(j.ge.1 .and. j.le.jz) then
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do i=0,LL-1
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s3(i-64,n)=s1(i+i1,j) !Copy from s1 into s3
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enddo
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endif
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enddo
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nsubmode=0
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if(mode_q65.eq.2) nsubmode=1
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if(mode_q65.eq.4) nsubmode=2
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if(mode_q65.eq.8) nsubmode=3
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if(mode_q65.eq.16) nsubmode=4
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nFadingModel=1
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baud=12000.0/nsps
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do ibw=ibwa,ibwb
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b90=1.72**ibw
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b90ts=b90/baud
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call q65_dec1(s3,nsubmode,b90ts,esnodb,irc,dat4,decoded)
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if(irc.ge.0) then
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snr2=esnodb - db(2500.0/baud) + 3.0 !Empirical adjustment
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idec=1
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ic=ia2/4;
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base=(sum(ccf1(-ia2:-ia2+ic)) + sum(ccf1(ia2-ic:ia2)))/(2.0+2.0*ic);
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ccf1=ccf1-base
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smax=maxval(ccf1)
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if(smax.gt.10.0) ccf1=10.0*ccf1/smax
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base=(sum(ccf2(-ia2:-ia2+ic)) + sum(ccf2(ia2-ic:ia2)))/(2.0+2.0*ic);
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ccf2=ccf2-base
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smax=maxval(ccf2)
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if(smax.gt.10.0) ccf2=10.0*ccf2/smax
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exit
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endif
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enddo
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return
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end subroutine q65_dec_q3
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2021-01-13 11:38:49 -05:00
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subroutine q65_dec1(s3,nsubmode,b90ts,esnodb,irc,dat4,decoded)
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use packjt77
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real s3(1,1) !Silence compiler warning that wants to see a 2D array
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real s3prob(0:63,63) !Symbol-value probabilities
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integer dat4(13)
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character c77*77,decoded*37
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logical unpk77_success
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nFadingModel=1
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decoded=' '
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call q65_intrinsics_ff(s3,nsubmode,b90ts,nFadingModel,s3prob)
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call q65_dec_fullaplist(s3,s3prob,codewords,ncw,esnodb,dat4,plog,irc)
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if(sum(dat4).le.0) irc=-2
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if(irc.ge.0 .and. plog.gt.PLOG_MIN) then
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write(c77,1000) dat4(1:12),dat4(13)/2
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1000 format(12b6.6,b5.5)
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call unpack77(c77,0,decoded,unpk77_success) !Unpack to get msgsent
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else
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irc=-1
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endif
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return
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end subroutine q65_dec1
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2021-01-13 09:46:14 -05:00
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subroutine q65_dec2(s3,nsubmode,b90ts,esnodb,irc,dat4,decoded)
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use packjt77
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real s3(1,1) !Silence compiler warning that wants to see a 2D array
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real s3prob(0:63,63) !Symbol-value probabilities
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integer dat4(13)
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character c77*77,decoded*37
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logical unpk77_success
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nFadingModel=1
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decoded=' '
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call q65_intrinsics_ff(s3,nsubmode,b90ts,nFadingModel,s3prob)
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call q65_dec(s3,s3prob,APmask,APsymbols,esnodb,dat4,irc)
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if(sum(dat4).le.0) irc=-2
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if(irc.ge.0) then
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write(c77,1000) dat4(1:12),dat4(13)/2
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1000 format(12b6.6,b5.5)
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call unpack77(c77,0,decoded,unpk77_success) !Unpack to get msgsent
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endif
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return
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end subroutine q65_dec2
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subroutine q65_s1_to_s3(s1,iz,jz,i0,j0,ipk,jpk,LL,mode_q65,sync,s3)
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2021-01-13 10:44:19 -05:00
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! Copy from s1 or s1a into s3
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2021-01-13 09:46:14 -05:00
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real s1(iz,jz)
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real s3(-64:LL-65,63)
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real sync(85) !sync vector
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i1=i0+ipk-64 + mode_q65
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i2=i1+LL-1
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if(i1.ge.1 .and. i2.le.iz) then
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j=j0+jpk-7
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n=0
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do k=1,85
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j=j+8
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if(sync(k).gt.0.0) then
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cycle
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endif
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n=n+1
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if(j.ge.1 .and. j.le.jz) s3(-64:LL-65,n)=s1(i1:i2,j)
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enddo
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endif
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return
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end subroutine q65_s1_to_s3
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2020-12-26 10:08:53 -05:00
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end module q65
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