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Merge branch 'feat-fst280' of bitbucket.org:k1jt/wsjtx into feat-fst280

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Include code to try sync with full message info.
This commit is contained in:
Joe Taylor 2020-11-23 08:47:37 -05:00
commit d76e56fa31
6 changed files with 89 additions and 18 deletions
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4
lib/q65_decode.f90
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@ -146,6 +146,10 @@ contains
endif
endif
call timer('q65loops',0)
! call q65_loops(c00,nutc,npts/2,nsps/2,nmode,mode65,nsubmode, &
! nFadingModel,ndepth,jpk0,xdt,f0,width,iaptype,apmask,apsymbols, &
! snr1,xdt1,f1,snr2,irc,dat4)
! baud rate required to compute B90TS later
call q65_loops(c00,nutc,npts/2,nsps/2,nmode,mode65,nsubmode, &
nFadingModel,ndepth,jpk0,xdt,f0,width,iaptype,apmask,apsymbols, &
codewords,snr1,xdt1,f1,snr2,irc,dat4)

24
lib/qra/q65/q65.c
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@ -277,9 +277,9 @@ int q65_esnodb(const q65_codec_ds *pCodec, float *pEsNodB, const int *ydec, cons
// Symbol time interval in seconds
#define TS_QRA64 0.576
#define TS_Q65 0.640
// #define TS_Q65 0.640 // T/R = 60 s
// The tables are computed assuming that the bin spacing is that of QRA64, that's to say
// 1/Ts = 12000/6912 Hz, but in q65 Ts is longer (0.640 s) and the table index
// 1/Ts = 12000/6912 Hz, but in Q65 Ts depends on the T/R interval and the table index
// corresponding to a given B90 must be scaled appropriately.
// See below.
@ -287,7 +287,7 @@ int q65_intrinsics_fastfading(q65_codec_ds *pCodec,
float *pIntrinsics, // intrinsic symbol probabilities output
const float *pInputEnergies, // received energies input
const int submode, // submode idx (0=A ... 4=E)
const float B90, // spread bandwidth (90% fractional energy)
const float B90Ts, // spread bandwidth (90% fractional energy)
const int fadingModel) // 0=Gaussian 1=Lorentzian fade model
{
int n, k, j;
@ -295,26 +295,26 @@ int q65_intrinsics_fastfading(q65_codec_ds *pCodec,
int hidx, hlen, hhsz, hlast;
const float *hptr;
float fTemp, fNoiseVar, sumix, maxlogp;
float EsNoMetric;
float EsNoMetric,B90;
float *weight;
const float *pCurSym, *pCurBin;
float *pCurIx;
// printf("pcodec=%08x submode=%d fadingmodel=%d B90Ts=%f\n",pcodec, submode,fadingModel, B90Ts);
if (pCodec==NULL)
return Q65_DECODE_INVPARAMS; // invalid pCodec pointer
if (submode<0 || submode>4)
return Q65_DECODE_INVPARAMS; // invalid submode
// As the symbol duration in q65 is longer than in QRA64 the fading tables continue
// to be valid if the B90 parameter is scaled by the actual symbol rate
// As the symbol duration in q65 is different than in QRA64,
// the fading tables continue to be valid if the B90Ts parameter
// is properly scaled to the QRA64 symbol interval
// Compute index to most appropriate weighting function coefficients
hidx = (int)(logf(B90*TS_Q65/TS_QRA64)/logf(1.09f) - 0.499f);
// if (hidx<0 || hidx > 64)
// // index of weighting function out of range
// // B90 out of range
// return q65_DECODE_INVPARAMS;
B90 = B90Ts/TS_QRA64;
hidx = (int)(logf(B90)/logf(1.09f) - 0.499f);
// Unlike in QRA64 we accept any B90, anyway limiting it to
// the extreme cases (0.9 to 210 Hz approx.)

2
lib/qra/q65/q65.h
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@ -69,7 +69,7 @@ int q65_intrinsics_fastfading(q65_codec_ds *pCodec,
float *pIntrinsics, // intrinsic symbol probabilities output
const float *pInputEnergies, // received energies input
const int submode, // submode idx (0=A ... 4=E)
const float B90, // spread bandwidth (90% fractional energy)
const float B90Ts, // normalized spread bandwidth (90% fractional energy)
const int fadingModel); // 0=Gaussian 1=Lorentzian fade model

3
lib/qra/q65/q65_loops.f90
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@ -85,7 +85,8 @@ subroutine q65_loops(c00,nutc,npts2,nsps,mode,mode64,nsubmode,nFadingModel, &
if(b90.gt.230.0) cycle
! if(b90.lt.0.15*width) exit
call timer('q65_intr',0)
call q65_intrinsics_ff(s3,nsubmode,b90,nFadingModel,s3prob)
b90ts = b90/baud
call q65_intrinsics_ff(s3,nsubmode,b90ts,nFadingModel,s3prob)
call timer('q65_intr',1)
if(iaptype.eq.4) then
call timer('q65_apli',0)

4
lib/qra/q65/q65_subs.c
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@ -46,7 +46,7 @@ void q65_enc_(int x[], int y[])
q65_encode(&codec,y,x);
}
void q65_intrinsics_ff_(float s3[], int* submode, float* B90,
void q65_intrinsics_ff_(float s3[], int* submode, float* B90Ts,
int* fadingModel, float s3prob[])
{
@ -69,7 +69,7 @@ void q65_intrinsics_ff_(float s3[], int* submode, float* B90,
}
first=0;
}
rc = q65_intrinsics_fastfading(&codec,s3prob,s3,*submode,*B90,*fadingModel);
rc = q65_intrinsics_fastfading(&codec,s3prob,s3,*submode,*B90Ts,*fadingModel);
if(rc<0) {
printf("error in q65_intrinsics()\n");
exit(0);

68
lib/sync_q65.f90
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@ -13,8 +13,10 @@ subroutine sync_q65(iwave,nmax,mode65,nsps,nfqso,ntol,xdt,f0,snr1,width)
! snr1 Relative SNR of sync signal
parameter (NSTEP=8) !Step size nsps/NSTEP
character*37 msg,msgsent
integer*2 iwave(0:nmax-1) !Raw data
integer isync(22) !Indices of sync symbols
integer itone(85)
real, allocatable :: s1(:,:) !Symbol spectra, quarter-symbol steps
real, allocatable :: ccf(:,:) !CCF(freq,lag)
real, allocatable :: ccf1(:) !CCF(freq) at best lag
@ -144,5 +146,69 @@ subroutine sync_q65(iwave,nmax,mode65,nsps,nfqso,ntol,xdt,f0,snr1,width)
enddo
width=i*1.414*df
return
!### Experimental:
nQSOprogress=3
if(nQSOprogress.lt.1) go to 900
! "Deep Likelihood" decode attempt
do imsg=1,3
ccf=0.
msg='K1ABC W9XYZ RRR'
if(imsg.eq.2) msg='K1ABC W9XYZ RR73'
if(imsg.eq.3) msg='K1ABC W9XYZ 73'
call genq65(msg,0,msgsent,itone,i3,n3)
do lag=lag1,lag2
do k=1,85
j=j0 + NSTEP*(k-1) + 1 + lag
if(j.ge.1 .and. j.le.jz) then
do i=-ia,ia
ii=i0+2*itone(k)+i
ccf(i,lag)=ccf(i,lag) + s1(ii,j)
enddo
endif
enddo
enddo
ic=ntol/df
ccfmax=0.
ipk=0
jpk=0
do i=-ic,ic
do j=lag1,lag2
if(ccf(i,j).gt.ccfmax) then
ipk=i
jpk=j
ccfmax=ccf(i,j)
endif
enddo
enddo
f0a=nfqso + ipk*df
xdta=jpk*dtstep
sq=0.
nsq=0
do j=lag1,lag2
if(abs(j-jpk).gt.6) then
sq=sq + ccf(ipk,j)**2
nsq=nsq+1
endif
enddo
rms=sqrt(sq/nsq)
smax=ccf(ipk,jpk)
snr1a=smax/rms
write(57,3001) imsg,xdt,xdta,f0,f0a,snr1,snr1a
3001 format(i1,6f8.2)
do j=lag1,lag2
write(55,3055) j,j*dtstep,ccf(ipk,j)/rms
3055 format(i5,f8.3,f10.3)
enddo
do i=-ia,ia
write(56,3056) i*df,ccf(i,jpk)/rms
3056 format(2f10.3)
enddo
enddo
900 return
end subroutine sync_q65