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Several tweaks to FT4 simulation and decoding procedures. Now -0.5 < DT < 0.5

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This commit is contained in:
Joe Taylor 2019-04-03 10:13:50 -04:00
parent 013c06b6ca
commit 6ea9f4990d
4 changed files with 12 additions and 16 deletions
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2
lib/decoder.f90
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@ -149,7 +149,7 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
go to 800
endif
if(params%nmode.eq.-4) then
if(params%nmode.eq.5) then
call timer('decft4 ',0)
call my_ft4%decode(ft4_decoded,id2,params%nQSOProgress,params%nfqso, &
params%nutc,params%nfa,params%nfb,params%ndepth,ncontest, &

7
lib/ft4/ft4sim.f90
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@ -111,18 +111,15 @@ program ft4sim
c0((NN+1)*NSPS:(NN+2)*NSPS-1)=c0((NN+1)*NSPS:(NN+2)*NSPS-1)*(1.0+cos(twopi*(/(i,i=0,NSPS-1)/)/(2.0*NSPS) ))/2.0
c0((NN+2)*NSPS:)=0.
k=nint((xdt+0.35)/dt)
k=nint((xdt+0.5)/dt)
c0=cshift(c0,-k)
ia=k
do ifile=1,nfiles
c=c0
if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c,NZZ,NWAVE,fs,delay,fspread)
c=sig*c
ib=k
wave=real(c)
peak=maxval(abs(wave(ia:ib)))
peak=maxval(abs(wave))
nslots=1
if(snrdb.lt.90) then

17
lib/ft4_decode.f90
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@ -31,7 +31,7 @@ contains
class(ft4_decoder), intent(inout) :: this
procedure(ft4_decode_callback) :: callback
parameter (NSS=NSPS/NDOWN)
parameter (NZZ=18*3456)
character message*37,msgsent*37,msg0*37
character c77*77
character*37 decodes(100)
@ -42,8 +42,8 @@ contains
character*6 hhmmss
character*4 cqstr,cqstr0
complex cd2(0:NMAX/NDOWN-1) !Complex waveform
complex cb(0:NMAX/NDOWN-1)
complex cd2(0:NZZ/NDOWN-1) !Complex waveform
complex cb(0:NZZ/NDOWN-1+NN*NSS)
complex cd(0:NN*NSS-1) !Complex waveform
complex ctwk(2*NSS),ctwk2(2*NSS,-16:16)
complex csymb(NSS)
@ -60,7 +60,7 @@ contains
integer apbits(2*ND)
integer apmy_ru(28),aphis_fd(28)
integer icos4a(0:3),icos4b(0:3),icos4c(0:3),icos4d(0:3)
integer*2 iwave(NMAX) !Raw received data
integer*2 iwave(NZZ) !Raw received data
integer*1 message77(77),rvec(77),apmask(2*ND),cw(2*ND)
integer*1 hbits(2*NN)
integer graymap(0:3)
@ -216,7 +216,7 @@ contains
snr=candidate(3,icand)-1.0
call ft4_downsample(iwave,dobigfft,f0,cd2) !Downsample to 32 Sam/Sym
if(dobigfft) dobigfft=.false.
sum2=sum(cd2*conjg(cd2))/(real(NMAX)/real(NDOWN))
sum2=sum(cd2*conjg(cd2))/(real(NZZ)/real(NDOWN))
if(sum2.gt.0.0) cd2=cd2/sqrt(sum2)
! Sample rate is now 12000/16 = 750 samples/second
do isync=1,2
@ -225,15 +225,14 @@ contains
idfmax=12
idfstp=3
ibmin=0
! ibmax=216 !Max DT = 216/750 = 0.288 s
ibmax=432
ibmax=800
ibstp=4
else
idfmin=idfbest-4
idfmax=idfbest+4
idfstp=1
ibmin=max(0,ibest-5)
ibmax=min(ibest+5,NMAX/NDOWN-1)
ibmax=min(ibest+5,NZZ/NDOWN-1)
ibstp=1
endif
ibest=-1
@ -462,7 +461,7 @@ contains
xsnr=-20.0
endif
nsnr=nint(max(-20.0,xsnr))
xdt=ibest/750.0 - 0.45
xdt=ibest/750.0 - 0.5
call this%callback(sync,nsnr,xdt,f0,message,iaptype,qual)
if(ibest.ge.ibmax-15) msg0=message !Possible dupe candidate
exit

2
widgets/mainwindow.cpp
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@ -2886,7 +2886,7 @@ void MainWindow::decode() //decode()
if(m_mode=="FT8") dec_data.params.lft8apon = ui->actionEnable_AP_FT8->isVisible () &&
ui->actionEnable_AP_FT8->isChecked ();
if(m_mode=="FT8") dec_data.params.napwid=50;
if(m_mode=="FT4") dec_data.params.nmode=-4;
if(m_mode=="FT4") dec_data.params.nmode=5;
dec_data.params.ntrperiod=m_TRperiod;
dec_data.params.nsubmode=m_nSubMode;
if(m_mode=="QRA64") dec_data.params.nsubmode=100 + m_nSubMode;