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Streamline fst4_decode. Add timer for downsampling.

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Steven Franke 2020-08-20 09:48:32 -05:00 committed by Bill Somerville
parent 782c779392
commit e02850ae5a
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GPG Key ID: D864B06D1E81618F
3 changed files with 88 additions and 97 deletions
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4
lib/decoder.f90
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@ -196,7 +196,7 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
params%nQSOProgress,params%nfqso,params%nfa,params%nfb, &
params%nsubmode,ndepth,params%ntr,params%nexp_decode, &
params%ntol,params%emedelay, &
logical(params%lapcqonly),mycall,hiscall,params%nfsplit,iwspr)
logical(params%lapcqonly),mycall,hiscall,iwspr)
call timer('dec240 ',1)
go to 800
endif
@ -210,7 +210,7 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
params%nQSOProgress,params%nfqso,params%nfa,params%nfb, &
params%nsubmode,ndepth,params%ntr,params%nexp_decode, &
params%ntol,params%emedelay, &
logical(params%lapcqonly),mycall,hiscall,params%nfsplit,iwspr)
logical(params%lapcqonly),mycall,hiscall,iwspr)
call timer('dec240 ',1)
go to 800
endif

19
lib/fst4/get_fst4_bitmetrics.f90
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@ -11,6 +11,7 @@ subroutine get_fst4_bitmetrics(cd,nss,hmod,nmax,nhicoh,bitmetrics,s4,badsync)
integer graymap(0:3)
integer ip(1)
integer hmod
integer hbits(2*NN)
logical one(0:65535,0:15) ! 65536 8-symbol sequences, 16 bits
logical first
logical badsync
@ -122,10 +123,28 @@ subroutine get_fst4_bitmetrics(cd,nss,hmod,nmax,nhicoh,bitmetrics,s4,badsync)
enddo
enddo
hbits=0
where(bitmetrics(:,1).ge.0) hbits=1
ns1=count(hbits( 1: 16).eq.(/0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0/))
ns2=count(hbits( 77: 92).eq.(/1,1,1,0,0,1,0,0,1,0,1,1,0,0,0,1/))
ns3=count(hbits(153:168).eq.(/0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0/))
ns4=count(hbits(229:244).eq.(/1,1,1,0,0,1,0,0,1,0,1,1,0,0,0,1/))
ns5=count(hbits(305:320).eq.(/0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0/))
nsync_qual=ns1+ns2+ns3+ns4+ns5
if(nsync_qual.lt. 46) then
badsync=.true.
return
endif
call normalizebmet(bitmetrics(:,1),2*NN)
call normalizebmet(bitmetrics(:,2),2*NN)
call normalizebmet(bitmetrics(:,3),2*NN)
call normalizebmet(bitmetrics(:,4),2*NN)
scalefac=2.83
bitmetrics=scalefac*bitmetrics
return
end subroutine get_fst4_bitmetrics

162
lib/fst4_decode.f90
View File

@ -31,7 +31,7 @@ contains
subroutine decode(this,callback,iwave,nutc,nQSOProgress,nfqso, &
nfa,nfb,nsubmode,ndepth,ntrperiod,nexp_decode,ntol, &
emedelay,lapcqonly,mycall,hiscall,nfsplit,iwspr)
emedelay,lapcqonly,mycall,hiscall,iwspr)
use timer_module, only: timer
use packjt77
@ -252,29 +252,10 @@ contains
call four2a(c_bigfft,nfft1,1,-1,0) !r2c
! call blank2(nfa,nfb,nfft1,c_bigfft,iwave)
nhicoh=0
if(hmod.eq.1) then
if(fMHz.lt.2.0) then
nsyncoh=8 ! Use N=8 for sync
nhicoh=1 ! Use N=1,2,4,8 for symbol estimation
else
nsyncoh=4 ! Use N=4 for sync
nhicoh=0 ! Use N=1,2,3,4 for symbol estimation
endif
else
if(hmod.eq.2) nsyncoh=1
if(hmod.eq.4) nsyncoh=-2
if(hmod.eq.8) nsyncoh=-4
endif
if( single_decode ) then
fa=max(100,nint(nfqso+1.5*hmod*baud-ntol))
fb=min(4800,nint(nfqso+1.5*hmod*baud+ntol))
else
fa=max(100,nfa)
fb=min(4800,nfb)
endif
nhicoh=1
nsyncoh=8
fa=max(100,nint(nfqso+1.5*hmod*baud-ntol))
fb=min(4800,nint(nfqso+1.5*hmod*baud+ntol))
minsync=1.2
if(ntrperiod.eq.15) minsync=1.15
@ -296,54 +277,15 @@ contains
! Output array c2 is complex baseband sampled at 12000/ndown Sa/sec.
! The size of the downsampled c2 array is nfft2=nfft1/ndown
call timer('dwnsmpl ',0)
call fst4_downsample(c_bigfft,nfft1,ndown,fc0,sigbw,c2)
call timer('dwnsmpl ',1)
call timer('sync240 ',0)
fc1=0.0
if(emedelay.lt.0.1) then ! search offsets from 0 s to 2 s
is0=1.5*nspsec
ishw=1.5*nspsec
else ! search plus or minus 1.5 s centered on emedelay
is0=nint((emedelay+1.0)*nspsec)
ishw=1.5*nspsec
endif
smax=-1.e30
do if=-12,12
fc=fc1 + 0.1*baud*if
do istart=max(1,is0-ishw),is0+ishw,4*hmod
call sync_fst4(c2,istart,fc,hmod,nsyncoh,nfft2,nss, &
ntrperiod,fs2,sync)
if(sync.gt.smax) then
fc2=fc
isbest=istart
smax=sync
endif
enddo
enddo
fc1=fc2
is0=isbest
ishw=4*hmod
isst=1*hmod
smax=0.0
do if=-7,7
fc=fc1 + 0.02*baud*if
do istart=max(1,is0-ishw),is0+ishw,isst
call sync_fst4(c2,istart,fc,hmod,nsyncoh,nfft2,nss, &
ntrperiod,fs2,sync)
if(sync.gt.smax) then
fc2=fc
isbest=istart
smax=sync
endif
enddo
enddo
call fst4_sync_search(c2,nfft2,hmod,fs2,nss,ntrperiod,nsyncoh,emedelay,sbest,fcbest,isbest)
call timer('sync240 ',1)
fc_synced = fc0 + fc2
fc_synced = fc0 + fcbest
dt_synced = (isbest-fs2)*dt2 !nominal dt is 1 second so frame starts at sample fs2
candidates(icand,3)=fc_synced
candidates(icand,4)=isbest
@ -382,7 +324,11 @@ contains
isbest=nint(candidates(icand,4))
xdt=(isbest-nspsec)/fs2
if(ntrperiod.eq.15) xdt=(isbest-real(nspsec)/2.0)/fs2
call timer('dwnsmpl ',0)
call fst4_downsample(c_bigfft,nfft1,ndown,fc_synced,sigbw,c2)
call timer('dwnsmpl ',1)
do ijitter=0,jittermax
if(ijitter.eq.0) ioffset=0
if(ijitter.eq.1) ioffset=1
@ -392,32 +338,16 @@ contains
cframe=c2(is0:is0+160*nss-1)
bitmetrics=0
call timer('bitmetrc',0)
if(hmod.eq.1) then
call get_fst4_bitmetrics(cframe,nss,hmod,nblock,nhicoh,bitmetrics,s4,badsync)
else
call get_fst4_bitmetrics2(cframe,nss,hmod,nblock,bitmetrics,s4,badsync)
endif
call get_fst4_bitmetrics(cframe,nss,hmod,nblock,nhicoh,bitmetrics,s4,badsync)
call timer('bitmetrc',1)
if(badsync) cycle
hbits=0
where(bitmetrics(:,1).ge.0) hbits=1
ns1=count(hbits( 1: 16).eq.(/0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0/))
ns2=count(hbits( 77: 92).eq.(/1,1,1,0,0,1,0,0,1,0,1,1,0,0,0,1/))
ns3=count(hbits(153:168).eq.(/0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0/))
ns4=count(hbits(229:244).eq.(/1,1,1,0,0,1,0,0,1,0,1,1,0,0,0,1/))
ns5=count(hbits(305:320).eq.(/0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0/))
nsync_qual=ns1+ns2+ns3+ns4+ns5
if(nsync_qual.lt. 46) cycle !### Value ?? ###
scalefac=2.83
do il=1,4
llrs( 1: 60,il)=bitmetrics( 17: 76, il)
llrs( 61:120,il)=bitmetrics( 93:152, il)
llrs(121:180,il)=bitmetrics(169:228, il)
llrs(181:240,il)=bitmetrics(245:304, il)
enddo
llrs=scalefac*llrs
apmag=maxval(abs(llrs(:,1)))*1.1
ntmax=nblock+nappasses(nQSOProgress)
@ -440,14 +370,8 @@ contains
iaptype=0
endif
if(itry.gt.nblock) then
llr=llrs(:,1)
if(nblock.gt.1) then
if(hmod.eq.1) llr=llrs(:,3)
if(hmod.eq.2) llr=llrs(:,1)
if(hmod.eq.4) llr=llrs(:,2)
if(hmod.eq.8) llr=llrs(:,4)
endif
if(itry.gt.nblock) then ! do ap passes
llr=llrs(:,nblock) ! Use largest blocksize as the basis for AP passes
iaptype=naptypes(nQSOProgress,itry-nblock)
if(lapcqonly) iaptype=1
if(iaptype.ge.2 .and. apbits(1).gt.1) cycle ! No, or nonstandard, mycall
@ -486,7 +410,7 @@ contains
if(iwspr.eq.0) then
maxosd=2
Keff=91
norder=3
norder=4
call timer('d240_101',0)
call decode240_101(llr,Keff,maxosd,norder,apmask,message101, &
cw,ntype,nharderrors,dmin)
@ -556,8 +480,8 @@ contains
fsig=fc_synced - 1.5*hmod*baud
if(ex) then
write(21,3021) nutc,icand,itry,nsyncoh,iaptype, &
ijitter,ntype,nsync_qual,nharderrors,dmin, &
sync,xsnr,xdt,fsig,w50,trim(msg)
ijitter,ntype,nsync_qual,nharderrors,dmin, &
sync,xsnr,xdt,fsig,w50,trim(msg)
3021 format(i6.6,6i3,2i4,f6.1,f7.2,f6.1,f6.2,f7.1,f7.3,1x,a)
flush(21)
endif
@ -799,6 +723,54 @@ contains
return
end subroutine get_candidates_fst4
subroutine fst4_sync_search(c2,nfft2,hmod,fs2,nss,ntrperiod,nsyncoh,emedelay,sbest,fcbest,isbest)
complex c2(0:nfft2-1)
integer hmod
nspsec=int(fs2)
baud=fs2/real(nss)
fc1=0.0
if(emedelay.lt.0.1) then ! search offsets from 0 s to 2 s
is0=1.5*nspsec
ishw=1.5*nspsec
else ! search plus or minus 1.5 s centered on emedelay
is0=nint((emedelay+1.0)*nspsec)
ishw=1.5*nspsec
endif
sbest=-1.e30
do if=-12,12
fc=fc1 + 0.1*baud*if
do istart=max(1,is0-ishw),is0+ishw,4*hmod
call sync_fst4(c2,istart,fc,hmod,nsyncoh,nfft2,nss, &
ntrperiod,fs2,sync)
if(sync.gt.sbest) then
fcbest=fc
isbest=istart
sbest=sync
endif
enddo
enddo
fc1=fcbest
is0=isbest
ishw=4*hmod
isst=1*hmod
sbest=0.0
do if=-7,7
fc=fc1 + 0.02*baud*if
do istart=max(1,is0-ishw),is0+ishw,isst
call sync_fst4(c2,istart,fc,hmod,nsyncoh,nfft2,nss, &
ntrperiod,fs2,sync)
if(sync.gt.sbest) then
fcbest=fc
isbest=istart
sbest=sync
endif
enddo
enddo
end subroutine fst4_sync_search
subroutine dopspread(itone,iwave,nsps,nmax,ndown,hmod,i0,fc,fmid,w50)
! On "plotspec" special request, compute Doppler spread for a decoded signal