mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-10-31 15:47:10 -04:00
Create ft4_decode.f90. Change stand-alone decoder ft4d.f90 to use ft4_decode.f90.
This commit is contained in:
parent
c52f755afc
commit
d9f4a27a3e
@ -513,6 +513,7 @@ set (wsjt_FSRCS
|
||||
lib/fsk4hf/ft2d.f90
|
||||
lib/ft4/ft4sim.f90
|
||||
lib/ft4/ft4d.f90
|
||||
lib/ft4/ft4_decode.f90
|
||||
lib/ft2/cdatetime.f90
|
||||
lib/ft2/ft2_decode.f90
|
||||
lib/77bit/my_hash.f90
|
||||
|
295
lib/ft4/ft4_decode.f90
Normal file
295
lib/ft4/ft4_decode.f90
Normal file
@ -0,0 +1,295 @@
|
||||
subroutine ft4_decode(cdatetime0,nfqso,iwave,ndecodes,mycall,hiscall,nrx,line)
|
||||
|
||||
use packjt77
|
||||
include 'ft4_params.f90'
|
||||
character message*37
|
||||
character c77*77
|
||||
character*61 line
|
||||
character*37 decodes(100)
|
||||
character*120 data_dir
|
||||
character*17 cdatetime0
|
||||
character*6 mycall,hiscall,hhmmss
|
||||
|
||||
complex cd2(0:NMAX/16-1) !Complex waveform
|
||||
complex cb(0:NMAX/16-1)
|
||||
complex cd(0:76*20-1) !Complex waveform
|
||||
complex ctwk(80),ctwk2(80)
|
||||
complex csymb(20)
|
||||
complex cs(0:3,NN)
|
||||
real s4(0:3,NN)
|
||||
|
||||
real bmeta(152),bmetb(152),bmetc(152)
|
||||
real s(NH1,NHSYM)
|
||||
real a(5)
|
||||
real llr(128),llr2(128),llra(128),llrb(128),llrc(128)
|
||||
real s2(0:255)
|
||||
real candidate(3,100)
|
||||
real savg(NH1),sbase(NH1)
|
||||
integer icos4(0:3)
|
||||
integer*2 iwave(NMAX) !Generated full-length waveform
|
||||
integer*1 message77(77),apmask(128),cw(128)
|
||||
integer*1 hbits(152)
|
||||
integer graymap(0:3)
|
||||
integer ip(1)
|
||||
logical unpk77_success
|
||||
logical one(0:511,0:7) ! 256 4-symbol sequences, 8 bits
|
||||
logical first
|
||||
data icos4/0,1,3,2/
|
||||
data graymap/0,1,3,2/
|
||||
data first/.true./
|
||||
save one
|
||||
|
||||
hhmmss=cdatetime0(12:17)
|
||||
fs=12000.0/NDOWN !Sample rate
|
||||
dt=1/fs !Sample interval after downsample (s)
|
||||
tt=NSPS*dt !Duration of "itone" symbols (s)
|
||||
baud=1.0/tt !Keying rate for "itone" symbols (baud)
|
||||
txt=NZ*dt !Transmission length (s)
|
||||
twopi=8.0*atan(1.0)
|
||||
h=1.0 !h=0.8 seems to be optimum for AWGN sensitivity (not for fading)
|
||||
|
||||
if(first) then
|
||||
one=.false.
|
||||
do i=0,255
|
||||
do j=0,7
|
||||
if(iand(i,2**j).ne.0) one(i,j)=.true.
|
||||
enddo
|
||||
enddo
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
data_dir="."
|
||||
fMHz=7.074
|
||||
|
||||
candidate=0.0
|
||||
ncand=0
|
||||
|
||||
nfa=375
|
||||
nfb=3000
|
||||
syncmin=1.0
|
||||
maxcand=100
|
||||
! call syncft4(iwave,nfa,nfb,syncmin,nfqso,maxcand,s,candidate,ncand,sbase)
|
||||
|
||||
call getcandidates4(iwave,375.0,3000.0,0.2,2200.0,100,savg,candidate,ncand,sbase)
|
||||
ndecodes=0
|
||||
do icand=1,ncand
|
||||
f0=candidate(1,icand)-1.5*37.5
|
||||
xsnr=10*log10(candidate(3,icand))
|
||||
if( f0.le.375.0 .or. f0.ge.(5000.0-375.0) ) cycle
|
||||
call ft4_downsample(iwave,f0,cd2) ! downsample from 320 Sa/Symbol to 20 Sa/Symbol
|
||||
sum2=sum(cd2*conjg(cd2))/(20.0*76)
|
||||
if(sum2.gt.0.0) cd2=cd2/sqrt(sum2)
|
||||
|
||||
! 750 samples/second here
|
||||
ibest=-1
|
||||
smax=-99.
|
||||
dfbest=-1.
|
||||
do idf=-90,+90,5
|
||||
df=idf
|
||||
a=0.
|
||||
a(1)=df
|
||||
ctwk=1.
|
||||
call twkfreq1(ctwk,80,fs,a,ctwk2)
|
||||
do istart=0,315
|
||||
call sync4d(cd2,istart,ctwk2,1,sync)
|
||||
if(sync.gt.smax) then
|
||||
smax=sync
|
||||
ibest=istart
|
||||
dfbest=df
|
||||
endif
|
||||
enddo
|
||||
enddo
|
||||
|
||||
f0=f0+dfbest
|
||||
!f0=1443.75
|
||||
call ft4_downsample(iwave,f0,cb) ! downsample from 320s/Symbol to 20s/Symbol
|
||||
sum2=sum(abs(cb)**2)/(20.0*76)
|
||||
if(sum2.gt.0.0) cb=cb/sqrt(sum2)
|
||||
!ibest=208
|
||||
cd=cb(ibest:ibest+76*20-1)
|
||||
do k=1,NN
|
||||
i1=(k-1)*20
|
||||
csymb=cd(i1:i1+19)
|
||||
call four2a(csymb,20,1,-1,1)
|
||||
cs(0:3,k)=csymb(1:4)/1e2
|
||||
s4(0:3,k)=abs(csymb(1:4))
|
||||
enddo
|
||||
|
||||
! sync quality check
|
||||
is1=0
|
||||
is2=0
|
||||
is3=0
|
||||
do k=1,4
|
||||
ip=maxloc(s4(:,k))
|
||||
if(icos4(k-1).eq.(ip(1)-1)) is1=is1+1
|
||||
ip=maxloc(s4(:,k+36))
|
||||
if(icos4(k-1).eq.(ip(1)-1)) is2=is2+1
|
||||
ip=maxloc(s4(:,k+72))
|
||||
if(icos4(k-1).eq.(ip(1)-1)) is3=is3+1
|
||||
enddo
|
||||
! hard sync sum - max is 12
|
||||
nsync=is1+is2+is3
|
||||
|
||||
do nseq=1,3
|
||||
if(nseq.eq.1) nsym=1
|
||||
if(nseq.eq.2) nsym=2
|
||||
if(nseq.eq.3) nsym=4
|
||||
nt=2**(2*nsym)
|
||||
do ks=1,76,nsym
|
||||
amax=-1.0
|
||||
do i=0,nt-1
|
||||
i1=i/64
|
||||
i2=iand(i,63)/16
|
||||
i3=iand(i,15)/4
|
||||
i4=iand(i,3)
|
||||
if(nsym.eq.1) then
|
||||
s2(i)=abs(cs(graymap(i4),ks))
|
||||
elseif(nsym.eq.2) then
|
||||
s2(i)=abs(cs(graymap(i3),ks)+cs(graymap(i4),ks+1))
|
||||
elseif(nsym.eq.4) then
|
||||
s2(i)=abs(cs(graymap(i1),ks ) + &
|
||||
cs(graymap(i2),ks+1) + &
|
||||
cs(graymap(i3),ks+2) + &
|
||||
cs(graymap(i4),ks+3) &
|
||||
)
|
||||
else
|
||||
print*,"Error - nsym must be 1, 2, or 4."
|
||||
endif
|
||||
enddo
|
||||
ipt=1+(ks-1)*2
|
||||
if(nsym.eq.1) ibmax=1
|
||||
if(nsym.eq.2) ibmax=3
|
||||
if(nsym.eq.4) ibmax=7
|
||||
do ib=0,ibmax
|
||||
bm=maxval(s2(0:nt-1),one(0:nt-1,ibmax-ib)) - &
|
||||
maxval(s2(0:nt-1),.not.one(0:nt-1,ibmax-ib))
|
||||
if(ipt+ib .gt.152) cycle
|
||||
if(nsym.eq.1) then
|
||||
bmeta(ipt+ib)=bm
|
||||
elseif(nsym.eq.2) then
|
||||
bmetb(ipt+ib)=bm
|
||||
elseif(nsym.eq.4) then
|
||||
bmetc(ipt+ib)=bm
|
||||
endif
|
||||
enddo
|
||||
enddo
|
||||
enddo
|
||||
|
||||
call normalizebmet(bmeta,152)
|
||||
call normalizebmet(bmetb,152)
|
||||
call normalizebmet(bmetc,152)
|
||||
|
||||
hbits=0
|
||||
where(bmeta.ge.0) hbits=1
|
||||
ns1=count(hbits( 1: 8).eq.(/0,0,0,1,1,0,1,1/))
|
||||
ns2=count(hbits( 73: 80).eq.(/0,0,0,1,1,0,1,1/))
|
||||
ns3=count(hbits(145:152).eq.(/0,0,0,1,1,0,1,1/))
|
||||
nsync_qual=ns1+ns2+ns3
|
||||
|
||||
sigma=0.7
|
||||
llra(1:64)=bmeta(9:72)
|
||||
llra(65:128)=bmeta(81:144)
|
||||
llra=2*llra/sigma**2
|
||||
llrb(1:64)=bmetb(9:72)
|
||||
llrb(65:128)=bmetb(81:144)
|
||||
llrb=2*llrb/sigma**2
|
||||
llrc(1:64)=bmetc(9:72)
|
||||
llrc(65:128)=bmetc(81:144)
|
||||
llrc=2*llrc/sigma**2
|
||||
|
||||
do isd=1,3
|
||||
if(isd.eq.1) llr=llra
|
||||
if(isd.eq.2) llr=llrb
|
||||
if(isd.eq.3) llr=llrc
|
||||
apmask=0
|
||||
max_iterations=40
|
||||
do ibias=0,0
|
||||
llr2=llr
|
||||
if(ibias.eq.1) llr2=llr+0.4
|
||||
if(ibias.eq.2) llr2=llr-0.4
|
||||
call bpdecode128_90(llr2,apmask,max_iterations,message77,cw,nharderror,niterations)
|
||||
if(nharderror.ge.0) exit
|
||||
enddo
|
||||
if(sum(message77).eq.0) cycle
|
||||
if( nharderror.ge.0 ) then
|
||||
write(c77,'(77i1)') message77(1:77)
|
||||
call unpack77(c77,1,message,unpk77_success)
|
||||
idupe=0
|
||||
do i=1,ndecodes
|
||||
if(decodes(i).eq.message) idupe=1
|
||||
enddo
|
||||
if(idupe.eq.1) exit
|
||||
ndecodes=ndecodes+1
|
||||
decodes(ndecodes)=message
|
||||
nsnr=nint(xsnr)-15
|
||||
freq=f0
|
||||
|
||||
write(line,1000) hhmmss,nsnr,ibest/750.0,nint(freq),message
|
||||
1000 format(a6,i4,f5.2,i5,' + ',1x,a37)
|
||||
open(24,file='all_ft2.txt',status='unknown',position='append')
|
||||
write(24,1002) cdatetime0,nsnr,ibest/750.0,nint(freq),message, &
|
||||
nharderror,nsync_qual,isd,niterations
|
||||
if(hhmmss.eq.' ') write(*,1002) cdatetime0,nsnr, &
|
||||
ibest/750.0,nint(freq),message,nharderror,nsync_qual,isd,niterations
|
||||
1002 format(a17,i4,f6.2,i5,' Rx ',a37,4i5)
|
||||
close(24)
|
||||
|
||||
!### Temporary: assume most recent decoded message conveys "hiscall".
|
||||
i0=index(message,' ')
|
||||
if(i0.ge.3 .and. i0.le.7) then
|
||||
hiscall=message(i0+1:i0+6)
|
||||
i1=index(hiscall,' ')
|
||||
if(i1.gt.0) hiscall=hiscall(1:i1)
|
||||
endif
|
||||
nrx=-1
|
||||
if(index(message,'CQ ').eq.1) nrx=1
|
||||
if((index(message,trim(mycall)//' ').eq.1) .and. &
|
||||
(index(message,' '//trim(hiscall)//' ').ge.4)) then
|
||||
if(index(message,' 559 ').gt.8) nrx=2
|
||||
if(index(message,' R 559 ').gt.8) nrx=3
|
||||
if(index(message,' RR73 ').gt.8) nrx=4
|
||||
endif
|
||||
!###
|
||||
exit
|
||||
|
||||
endif
|
||||
enddo ! sequence estimation
|
||||
enddo !candidate list
|
||||
|
||||
return
|
||||
end subroutine ft4_decode
|
||||
|
||||
subroutine ft4_downsample(iwave,f0,c)
|
||||
|
||||
! Input: i*2 data in iwave() at sample rate 12000 Hz
|
||||
! Output: Complex data in c(), sampled at 1200 Hz
|
||||
|
||||
include 'ft4_params.f90'
|
||||
parameter (NFFT2=NMAX/16)
|
||||
integer*2 iwave(NMAX)
|
||||
complex c(0:NMAX/16-1)
|
||||
complex c1(0:NFFT2-1)
|
||||
complex cx(0:NMAX/2)
|
||||
real x(NMAX)
|
||||
equivalence (x,cx)
|
||||
|
||||
BW=6.0*75
|
||||
df=12000.0/NMAX
|
||||
x=iwave
|
||||
call four2a(x,NMAX,1,-1,0) !r2c FFT to freq domain
|
||||
ibw=nint(BW/df)
|
||||
i0=nint(f0/df)
|
||||
c1=0.
|
||||
c1(0)=cx(i0)
|
||||
do i=1,NFFT2/2
|
||||
arg=(i-1)*df/bw
|
||||
win=exp(-arg*arg)
|
||||
c1(i)=cx(i0+i)*win
|
||||
c1(NFFT2-i)=cx(i0-i)*win
|
||||
enddo
|
||||
c1=c1/NFFT2
|
||||
call four2a(c1,NFFT2,1,1,1) !c2c FFT back to time domain
|
||||
c=c1(0:NMAX/16-1)
|
||||
return
|
||||
end subroutine ft4_downsample
|
||||
|
293
lib/ft4/ft4d.f90
293
lib/ft4/ft4d.f90
@ -1,59 +1,28 @@
|
||||
program ft4d
|
||||
|
||||
use crc
|
||||
use packjt77
|
||||
include 'ft4_params.f90'
|
||||
character arg*8,message*37,c77*77,infile*80,fname*16,datetime*11
|
||||
character*37 decodes(100)
|
||||
character*120 data_dir
|
||||
character*90 dmsg
|
||||
complex cd2(0:NMAX/16-1) !Complex waveform
|
||||
complex cb(0:NMAX/16-1)
|
||||
complex cd(0:76*20-1) !Complex waveform
|
||||
complex csum,cterm
|
||||
complex ctwk(80),ctwk2(80)
|
||||
complex csymb(20)
|
||||
complex cs(0:3,NN)
|
||||
real s4(0:3,NN)
|
||||
|
||||
character*8 arg
|
||||
character*17 cdatetime
|
||||
character*120 data_dir
|
||||
character*11 datetime
|
||||
character*37 decodes(100)
|
||||
character*16 fname
|
||||
character*6 hiscall
|
||||
character*80 infile
|
||||
character*61 line
|
||||
character*6 mycall
|
||||
|
||||
real*8 fMHz
|
||||
real ps(0:8191),psbest(0:8191)
|
||||
real bmeta(152),bmetb(152),bmetc(152)
|
||||
real s(NH1,NHSYM)
|
||||
real a(5)
|
||||
real llr(128),llr2(128),llra(128),llrb(128),llrc(128)
|
||||
real s2(0:255)
|
||||
real candidate(3,100)
|
||||
real savg(NH1),sbase(NH1)
|
||||
|
||||
integer ihdr(11)
|
||||
integer icos4(0:3)
|
||||
integer*2 iwave(NMAX) !Generated full-length waveform
|
||||
integer*1 message77(77),apmask(128),cw(128)
|
||||
integer*1 hbits(152),hbits1(152),hbits3(152)
|
||||
integer*1 s12(12)
|
||||
integer graymap(0:3)
|
||||
integer ip(1)
|
||||
logical unpk77_success
|
||||
logical one(0:511,0:7) ! 256 4-symbol sequences, 8 bits
|
||||
data s12/1,1,1,2,2,2,2,2,2,1,1,1/
|
||||
data icos4/0,1,3,2/
|
||||
data graymap/0,1,3,2/
|
||||
save one
|
||||
|
||||
fs=12000.0/NDOWN !Sample rate
|
||||
dt=1/fs !Sample interval after downsample (s)
|
||||
tt=NSPS*dt !Duration of "itone" symbols (s)
|
||||
baud=1.0/tt !Keying rate for "itone" symbols (baud)
|
||||
txt=NZ*dt !Transmission length (s)
|
||||
twopi=8.0*atan(1.0)
|
||||
h=1.0 !h=0.8 seems to be optimum for AWGN sensitivity (not for fading)
|
||||
|
||||
one=.false.
|
||||
do i=0,255
|
||||
do j=0,7
|
||||
if(iand(i,2**j).ne.0) one(i,j)=.true.
|
||||
enddo
|
||||
enddo
|
||||
|
||||
nargs=iargc()
|
||||
if(nargs.lt.1) then
|
||||
@ -82,174 +51,11 @@ program ft4d
|
||||
read(10,end=999) ihdr,iwave
|
||||
read(infile(j2-4:j2-1),*) nutc
|
||||
datetime=infile(j2-11:j2-1)
|
||||
cdatetime=' '//datetime
|
||||
close(10)
|
||||
candidate=0.0
|
||||
ncand=0
|
||||
|
||||
nfqso=1500
|
||||
nfa=500
|
||||
nfb=2700
|
||||
syncmin=1.0
|
||||
maxcand=100
|
||||
! call syncft4(iwave,nfa,nfb,syncmin,nfqso,maxcand,s,candidate,ncand,sbase)
|
||||
|
||||
call getcandidates4(iwave,375.0,3000.0,0.2,2200.0,100,savg,candidate,ncand,sbase)
|
||||
ndecodes=0
|
||||
do icand=1,ncand
|
||||
f0=candidate(1,icand)-1.5*37.5
|
||||
xsnr=1.0
|
||||
if( f0.le.375.0 .or. f0.ge.(5000.0-375.0) ) cycle
|
||||
call ft4_downsample(iwave,f0,cd2) ! downsample from 320 Sa/Symbol to 20 Sa/Symbol
|
||||
sum2=sum(cd2*conjg(cd2))/(20.0*76)
|
||||
if(sum2.gt.0.0) cd2=cd2/sqrt(sum2)
|
||||
|
||||
! 750 samples/second here
|
||||
ibest=-1
|
||||
smax=-99.
|
||||
dfbest=-1.
|
||||
do idf=-90,+90,5
|
||||
df=idf
|
||||
a=0.
|
||||
a(1)=df
|
||||
ctwk=1.
|
||||
call twkfreq1(ctwk,80,fs,a,ctwk2)
|
||||
do istart=0,315
|
||||
call sync4d(cd2,istart,ctwk2,1,sync)
|
||||
if(sync.gt.smax) then
|
||||
smax=sync
|
||||
ibest=istart
|
||||
dfbest=df
|
||||
endif
|
||||
enddo
|
||||
enddo
|
||||
|
||||
f0=f0+dfbest
|
||||
!f0=1443.75
|
||||
call ft4_downsample(iwave,f0,cb) ! downsample from 320s/Symbol to 20s/Symbol
|
||||
sum2=sum(abs(cb)**2)/(20.0*76)
|
||||
if(sum2.gt.0.0) cb=cb/sqrt(sum2)
|
||||
!ibest=208
|
||||
cd=cb(ibest:ibest+76*20-1)
|
||||
do k=1,NN
|
||||
i1=(k-1)*20
|
||||
csymb=cd(i1:i1+19)
|
||||
call four2a(csymb,20,1,-1,1)
|
||||
cs(0:3,k)=csymb(1:4)/1e2
|
||||
s4(0:3,k)=abs(csymb(1:4))
|
||||
enddo
|
||||
|
||||
! sync quality check
|
||||
is1=0
|
||||
is2=0
|
||||
is3=0
|
||||
do k=1,4
|
||||
ip=maxloc(s4(:,k))
|
||||
if(icos4(k-1).eq.(ip(1)-1)) is1=is1+1
|
||||
ip=maxloc(s4(:,k+36))
|
||||
if(icos4(k-1).eq.(ip(1)-1)) is2=is2+1
|
||||
ip=maxloc(s4(:,k+72))
|
||||
if(icos4(k-1).eq.(ip(1)-1)) is3=is3+1
|
||||
enddo
|
||||
! hard sync sum - max is 12
|
||||
nsync=is1+is2+is3
|
||||
|
||||
do nseq=1,3
|
||||
if(nseq.eq.1) nsym=1
|
||||
if(nseq.eq.2) nsym=2
|
||||
if(nseq.eq.3) nsym=4
|
||||
nt=2**(2*nsym)
|
||||
do ks=1,76,nsym
|
||||
amax=-1.0
|
||||
do i=0,nt-1
|
||||
i1=i/64
|
||||
i2=iand(i,63)/16
|
||||
i3=iand(i,15)/4
|
||||
i4=iand(i,3)
|
||||
if(nsym.eq.1) then
|
||||
s2(i)=abs(cs(graymap(i4),ks))
|
||||
elseif(nsym.eq.2) then
|
||||
s2(i)=abs(cs(graymap(i3),ks)+cs(graymap(i4),ks+1))
|
||||
elseif(nsym.eq.4) then
|
||||
s2(i)=abs(cs(graymap(i1),ks ) + &
|
||||
cs(graymap(i2),ks+1) + &
|
||||
cs(graymap(i3),ks+2) + &
|
||||
cs(graymap(i4),ks+3) &
|
||||
)
|
||||
else
|
||||
print*,"Error - nsym must be 1, 2, or 4."
|
||||
endif
|
||||
enddo
|
||||
ipt=1+(ks-1)*2
|
||||
if(nsym.eq.1) ibmax=1
|
||||
if(nsym.eq.2) ibmax=3
|
||||
if(nsym.eq.4) ibmax=7
|
||||
do ib=0,ibmax
|
||||
bm=maxval(s2(0:nt-1),one(0:nt-1,ibmax-ib)) - &
|
||||
maxval(s2(0:nt-1),.not.one(0:nt-1,ibmax-ib))
|
||||
if(ipt+ib .gt.152) cycle
|
||||
if(nsym.eq.1) then
|
||||
bmeta(ipt+ib)=bm
|
||||
elseif(nsym.eq.2) then
|
||||
bmetb(ipt+ib)=bm
|
||||
elseif(nsym.eq.4) then
|
||||
bmetc(ipt+ib)=bm
|
||||
endif
|
||||
enddo
|
||||
enddo
|
||||
enddo
|
||||
|
||||
call normalizebmet(bmeta,152)
|
||||
call normalizebmet(bmetb,152)
|
||||
call normalizebmet(bmetc,152)
|
||||
|
||||
hbits=0
|
||||
where(bmeta.ge.0) hbits=1
|
||||
ns1=count(hbits( 1: 8).eq.(/0,0,0,1,1,0,1,1/))
|
||||
ns2=count(hbits( 73: 80).eq.(/0,0,0,1,1,0,1,1/))
|
||||
ns3=count(hbits(145:152).eq.(/0,0,0,1,1,0,1,1/))
|
||||
nsync_qual=ns1+ns2+ns3
|
||||
|
||||
sigma=0.7
|
||||
llra(1:64)=bmeta(9:72)
|
||||
llra(65:128)=bmeta(81:144)
|
||||
llra=2*llra/sigma**2
|
||||
llrb(1:64)=bmetb(9:72)
|
||||
llrb(65:128)=bmetb(81:144)
|
||||
llrb=2*llrb/sigma**2
|
||||
llrc(1:64)=bmetc(9:72)
|
||||
llrc(65:128)=bmetc(81:144)
|
||||
llrc=2*llrc/sigma**2
|
||||
|
||||
do isd=1,3
|
||||
if(isd.eq.1) llr=llra
|
||||
if(isd.eq.2) llr=llrb
|
||||
if(isd.eq.3) llr=llrc
|
||||
apmask=0
|
||||
max_iterations=40
|
||||
do ibias=0,0
|
||||
llr2=llr
|
||||
if(ibias.eq.1) llr2=llr+0.4
|
||||
if(ibias.eq.2) llr2=llr-0.4
|
||||
call bpdecode128_90(llr2,apmask,max_iterations,message77,cw,nharderror,niterations)
|
||||
if(nharderror.ge.0) exit
|
||||
enddo
|
||||
if(sum(message77).eq.0) cycle
|
||||
if( nharderror.ge.0 ) then
|
||||
write(c77,'(77i1)') message77(1:77)
|
||||
call unpack77(c77,1,message,unpk77_success)
|
||||
idupe=0
|
||||
do i=1,ndecodes
|
||||
if(decodes(i).eq.message) idupe=1
|
||||
enddo
|
||||
if(idupe.eq.1) cycle
|
||||
ndecodes=ndecodes+1
|
||||
decodes(ndecodes)=message
|
||||
nsnr=nint(xsnr)
|
||||
write(*,1212) datetime(8:11),nsnr,ibest/750.0,f0,message,'*',nharderror,nsync_qual,isd,niterations
|
||||
1212 format(a4,i4,2x,f5.3,f11.1,2x,a22,a1,i5,i5,i5,i5)
|
||||
endif
|
||||
enddo ! sequence estimation
|
||||
enddo !candidate list
|
||||
call ft4_decode(cdatetime,nfqso,iwave,ndecodes,mycall,hiscall,nrx,line)
|
||||
if(ndecodes.ge.1) write(*,'(a61)') line
|
||||
enddo !files
|
||||
|
||||
write(*,1120)
|
||||
@ -257,73 +63,4 @@ program ft4d
|
||||
|
||||
999 end program ft4d
|
||||
|
||||
subroutine getbitmetric(ib,ps,ns,xmet)
|
||||
real ps(0:ns-1)
|
||||
xm1=0
|
||||
xm0=0
|
||||
do i=0,ns-1
|
||||
if( iand(i/ib,1) .eq. 1 .and. ps(i) .gt. xm1 ) xm1=ps(i)
|
||||
if( iand(i/ib,1) .eq. 0 .and. ps(i) .gt. xm0 ) xm0=ps(i)
|
||||
enddo
|
||||
xmet=xm1-xm0
|
||||
return
|
||||
end subroutine getbitmetric
|
||||
|
||||
subroutine downsample4(ci,f0,co)
|
||||
parameter(NI=144*160,NH=NI/2,NO=NI/16) ! downsample from 200 samples per symbol to 10
|
||||
complex ci(0:NI-1),ct(0:NI-1)
|
||||
complex co(0:NO-1)
|
||||
fs=12000.0
|
||||
df=fs/NI
|
||||
ct=ci
|
||||
call four2a(ct,NI,1,-1,1) !c2c FFT to freq domain
|
||||
i0=nint(f0/df)
|
||||
ct=cshift(ct,i0)
|
||||
co=0.0
|
||||
co(0)=ct(0)
|
||||
b=8.0
|
||||
do i=1,NO/2
|
||||
arg=(i*df/b)**2
|
||||
filt=exp(-arg)
|
||||
co(i)=ct(i)*filt
|
||||
co(NO-i)=ct(NI-i)*filt
|
||||
enddo
|
||||
co=co/NO
|
||||
call four2a(co,NO,1,1,1) !c2c FFT back to time domain
|
||||
return
|
||||
end subroutine downsample4
|
||||
|
||||
subroutine ft4_downsample(iwave,f0,c)
|
||||
|
||||
! Input: i*2 data in iwave() at sample rate 12000 Hz
|
||||
! Output: Complex data in c(), sampled at 1200 Hz
|
||||
|
||||
include 'ft4_params.f90'
|
||||
parameter (NFFT2=NMAX/16)
|
||||
integer*2 iwave(NMAX)
|
||||
complex c(0:NMAX/16-1)
|
||||
complex c1(0:NFFT2-1)
|
||||
complex cx(0:NMAX/2)
|
||||
real x(NMAX)
|
||||
equivalence (x,cx)
|
||||
|
||||
BW=6.0*75
|
||||
df=12000.0/NMAX
|
||||
x=iwave
|
||||
call four2a(x,NMAX,1,-1,0) !r2c FFT to freq domain
|
||||
ibw=nint(BW/df)
|
||||
i0=nint(f0/df)
|
||||
c1=0.
|
||||
c1(0)=cx(i0)
|
||||
do i=1,NFFT2/2
|
||||
arg=(i-1)*df/bw
|
||||
win=exp(-arg*arg)
|
||||
c1(i)=cx(i0+i)*win
|
||||
c1(NFFT2-i)=cx(i0-i)*win
|
||||
enddo
|
||||
c1=c1/NFFT2
|
||||
call four2a(c1,NFFT2,1,1,1) !c2c FFT back to time domain
|
||||
c=c1(0:NMAX/16-1)
|
||||
return
|
||||
end subroutine ft4_downsample
|
||||
|
||||
|
@ -92,12 +92,12 @@ program ft4sim
|
||||
enddo
|
||||
|
||||
! Define the instantaneous frequency waveform
|
||||
dphi_peak=twopi*(hmod/2.0)/real(NSPS)
|
||||
dphi_peak=twopi*hmod/real(NSPS)
|
||||
dphi=0.0
|
||||
do j=1,NN
|
||||
ib=(j-1)*320
|
||||
ie=ib+960-1
|
||||
dphi(ib:ie)=dphi(ib:ie)+dphi_peak*pulse*(2*itone(j)-3)
|
||||
dphi(ib:ie)=dphi(ib:ie)+dphi_peak*pulse*itone(j)
|
||||
enddo
|
||||
|
||||
phi=0.0
|
||||
|
@ -5,7 +5,6 @@ subroutine genft4(msg0,ichk,msgsent,i4tone)
|
||||
! Input:
|
||||
! - msg0 requested message to be transmitted
|
||||
! - ichk if ichk=1, return only msgsent
|
||||
! if ichk.ge.10000, set imsg=ichk-10000 for short msg
|
||||
! - msgsent message as it will be decoded
|
||||
! - i4tone array of audio tone values, {0,1,2,3}
|
||||
|
||||
@ -21,7 +20,6 @@ subroutine genft4(msg0,ichk,msgsent,i4tone)
|
||||
integer*1 s12(12)
|
||||
integer icos4(4)
|
||||
real*8 xi(864),xq(864),pi,twopi
|
||||
! data s12/1,1,1,2,2,2,2,2,2,1,1,1/
|
||||
data icos4/0,1,3,2/
|
||||
|
||||
logical unpk77_success
|
||||
|
@ -26,7 +26,7 @@ subroutine syncft4(iwave,nfa,nfb,syncmin,nfqso,maxcand,s,candidate, &
|
||||
! Compute symbol spectra, stepping by NSTEP steps.
|
||||
savg=0.
|
||||
tstep=NSTEP/12000.0
|
||||
df=12000.0/NFFT1 !3.125 Hz
|
||||
df=12000.0/NFFT1
|
||||
fac=1.0/300.0
|
||||
do j=1,NHSYM
|
||||
ia=(j-1)*NSTEP + 1
|
||||
|
Loading…
Reference in New Issue
Block a user