mirror of https://github.com/saitohirga/WSJT-X.git
Add ft4 files in lib/ft4.
This commit is contained in:
Steve Franke
parent
3bdbf19d1d
commit
66e3f11fba
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@ -463,7 +463,7 @@ set (wsjt_FSRCS
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lib/genmsk_128_90.f90
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lib/genmsk40.f90
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lib/fsk4hf/genft2.f90
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lib/fsk4hf/genft4.f90
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lib/ft4/genft4.f90
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lib/genqra64.f90
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lib/ft8/genft8refsig.f90
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lib/genwspr.f90
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@ -509,8 +509,10 @@ set (wsjt_FSRCS
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lib/msk144signalquality.f90
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lib/msk144sim.f90
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lib/mskrtd.f90
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lib/fsk4hf/ft4sim.f90
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lib/fsk4hf/ft4d.f90
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lib/fsk4hf/ft2sim.f90
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lib/fsk4hf/ft2d.f90
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lib/ft4/ft4sim.f90
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lib/ft4/ft4d.f90
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lib/ft2/cdatetime.f90
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lib/ft2/ft2_decode.f90
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lib/77bit/my_hash.f90
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@ -553,10 +555,13 @@ set (wsjt_FSRCS
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lib/sync4.f90
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lib/sync64.f90
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lib/sync65.f90
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lib/ft4/getcandidates4.f90
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lib/fsk4hf/getcandidates2.f90
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lib/ft2/getcandidates2a.f90
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lib/ft4/syncft4.f90
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lib/ft8/sync8.f90
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lib/ft8/sync8d.f90
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lib/ft4/sync4d.f90
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lib/sync9.f90
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lib/sync9f.f90
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lib/sync9w.f90
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@ -1265,10 +1270,16 @@ target_link_libraries (ft8sim wsjt_fort wsjt_cxx)
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add_executable (msk144sim lib/msk144sim.f90 wsjtx.rc)
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target_link_libraries (msk144sim wsjt_fort wsjt_cxx)
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add_executable (ft4sim lib/fsk4hf/ft4sim.f90 wsjtx.rc)
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add_executable (ft2sim lib/fsk4hf/ft2sim.f90 wsjtx.rc)
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target_link_libraries (ft2sim wsjt_fort wsjt_cxx)
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add_executable (ft2d lib/fsk4hf/ft2d.f90 wsjtx.rc)
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target_link_libraries (ft2d wsjt_fort wsjt_cxx)
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add_executable (ft4sim lib/ft4/ft4sim.f90 wsjtx.rc)
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target_link_libraries (ft4sim wsjt_fort wsjt_cxx)
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add_executable (ft4d lib/fsk4hf/ft4d.f90 wsjtx.rc)
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add_executable (ft4d lib/ft4/ft4d.f90 wsjtx.rc)
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target_link_libraries (ft4d wsjt_fort wsjt_cxx)
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endif(WSJT_BUILD_UTILS)
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@ -1,317 +1,329 @@
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program ft4d
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use crc
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use packjt77
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include 'ft4_params.f90'
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character arg*8,message*37,c77*77,infile*80,fname*16,datetime*11
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character*37 decodes(100)
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character*120 data_dir
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character*90 dmsg
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complex cd2(0:NMAX/16-1) !Complex waveform
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complex cb(0:NMAX/16-1)
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complex cd(0:76*20-1) !Complex waveform
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complex c3(0:19),c2(0:19),c1(0:19),c0(0:19)
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complex ccor(0:3,76)
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complex csum,cterm,cc0,cc1,cc2,cc3,csync1,csync2
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complex csync(12)
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real*8 fMHz
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use crc
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use packjt77
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include 'ft4_params.f90'
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character arg*8,message*37,c77*77,infile*80,fname*16,datetime*11
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character*37 decodes(100)
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character*120 data_dir
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character*90 dmsg
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complex cd2(0:NMAX/16-1) !Complex waveform
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complex cb(0:NMAX/16-1)
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complex cd(0:76*20-1) !Complex waveform
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complex csum,cterm
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complex ctwk(80),ctwk2(80)
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complex csymb(20)
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complex cs(0:3,NN)
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real s4(0:3,NN)
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real a(5)
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real rxdata(128),llr(128) !Soft symbols
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real llr2(128)
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real sbits(152),sbits1(152),sbits3(152)
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real ps(0:8191),psbest(0:8191)
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real candidates(100,2)
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real savg(NH1),sbase(NH1)
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integer ihdr(11)
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integer*2 iwave(NMAX) !Generated full-length waveform
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integer*1 message77(77),apmask(128),cw(128)
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integer*1 hbits(152),hbits1(152),hbits3(152)
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integer*1 s12(12)
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logical unpk77_success
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data s12/0,0,0,1,1,1,1,1,1,0,0,0/
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real*8 fMHz
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real ps(0:8191),psbest(0:8191)
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real bmeta(152),bmetb(152),bmetc(152)
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real s(NH1,NHSYM)
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real a(5)
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real llr(128),llr2(128),llra(128),llrb(128),llrc(128)
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real s2(0:255)
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real candidate(3,100)
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real savg(NH1),sbase(NH1)
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integer ihdr(11)
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integer icos4(0:3)
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integer*2 iwave(NMAX) !Generated full-length waveform
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integer*1 message77(77),apmask(128),cw(128)
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integer*1 hbits(152),hbits1(152),hbits3(152)
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integer*1 s12(12)
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integer graymap(0:3)
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integer ip(1)
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logical unpk77_success
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logical one(0:511,0:7) ! 256 4-symbol sequences, 8 bits
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data s12/1,1,1,2,2,2,2,2,2,1,1,1/
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data icos4/0,1,3,2/
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data graymap/0,1,3,2/
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save one
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fs=12000.0/NDOWN !Sample rate
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dt=1/fs !Sample interval after downsample (s)
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tt=NSPS*dt !Duration of "itone" symbols (s)
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baud=1.0/tt !Keying rate for "itone" symbols (baud)
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txt=NZ*dt !Transmission length (s)
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twopi=8.0*atan(1.0)
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h=1.000 !h=0.8 seems to be optimum for AWGN sensitivity (not for fading)
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fs=12000.0/NDOWN !Sample rate
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dt=1/fs !Sample interval after downsample (s)
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tt=NSPS*dt !Duration of "itone" symbols (s)
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baud=1.0/tt !Keying rate for "itone" symbols (baud)
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txt=NZ*dt !Transmission length (s)
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twopi=8.0*atan(1.0)
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h=1.0 !h=0.8 seems to be optimum for AWGN sensitivity (not for fading)
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dphi=twopi/2*baud*h*dt*16 ! dt*16 is samp interval after downsample
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dphi0=-3*dphi
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dphi1=-dphi
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dphi2=+dphi
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dphi3=+3*dphi
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phi0=0.0
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phi1=0.0
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phi2=0.0
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phi3=0.0
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do i=0,19
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c3(i)=cmplx(cos(phi3),sin(phi3))
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c2(i)=cmplx(cos(phi2),sin(phi2))
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c1(i)=cmplx(cos(phi1),sin(phi1))
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c0(i)=cmplx(cos(phi0),sin(phi0))
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phi3=mod(phi3+dphi3,twopi)
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phi2=mod(phi2+dphi2,twopi)
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phi1=mod(phi1+dphi1,twopi)
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phi0=mod(phi0+dphi0,twopi)
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enddo
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the=twopi*h/2.0
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cc3=cmplx(cos(3*the),+sin(3*the))
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cc2=cmplx(cos(the),+sin(the))
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cc1=cmplx(cos(the),-sin(the))
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cc0=cmplx(cos(3*the),-sin(3*the))
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one=.false.
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do i=0,255
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do j=0,7
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if(iand(i,2**j).ne.0) one(i,j)=.true.
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enddo
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enddo
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nargs=iargc()
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if(nargs.lt.1) then
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print*,'Usage: ft4d [-a <data_dir>] [-f fMHz] file1 [file2 ...]'
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go to 999
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endif
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iarg=1
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data_dir="."
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call getarg(iarg,arg)
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if(arg(1:2).eq.'-a') then
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call getarg(iarg+1,data_dir)
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iarg=iarg+2
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endif
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call getarg(iarg,arg)
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if(arg(1:2).eq.'-f') then
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call getarg(iarg+1,arg)
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read(arg,*) fMHz
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iarg=iarg+2
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endif
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ncoh=1
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do ifile=iarg,nargs
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call getarg(ifile,infile)
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j2=index(infile,'.wav')
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open(10,file=infile,status='old',access='stream')
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read(10,end=999) ihdr,iwave
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read(infile(j2-4:j2-1),*) nutc
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datetime=infile(j2-11:j2-1)
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close(10)
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candidate=0.0
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ncand=0
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nfqso=1500
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nfa=500
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nfb=2700
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syncmin=1.0
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maxcand=100
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! call syncft4(iwave,nfa,nfb,syncmin,nfqso,maxcand,s,candidate,ncand,sbase)
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call getcandidates4(iwave,375.0,3000.0,0.2,2200.0,100,savg,candidate,ncand,sbase)
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ndecodes=0
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do icand=1,ncand
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f0=candidate(1,icand)-1.5*37.5
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xsnr=1.0
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if( f0.le.375.0 .or. f0.ge.(5000.0-375.0) ) cycle
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call ft4_downsample(iwave,f0,cd2) ! downsample from 320 Sa/Symbol to 20 Sa/Symbol
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sum2=sum(cd2*conjg(cd2))/(20.0*76)
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if(sum2.gt.0.0) cd2=cd2/sqrt(sum2)
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nargs=iargc()
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if(nargs.lt.1) then
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print*,'Usage: ft4d [-a <data_dir>] [-f fMHz] file1 [file2 ...]'
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go to 999
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endif
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iarg=1
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data_dir="."
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call getarg(iarg,arg)
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if(arg(1:2).eq.'-a') then
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call getarg(iarg+1,data_dir)
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iarg=iarg+2
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endif
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call getarg(iarg,arg)
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if(arg(1:2).eq.'-f') then
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call getarg(iarg+1,arg)
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read(arg,*) fMHz
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iarg=iarg+2
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endif
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ncoh=1
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do ifile=iarg,nargs
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call getarg(ifile,infile)
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j2=index(infile,'.wav')
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open(10,file=infile,status='old',access='stream')
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read(10,end=999) ihdr,iwave
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read(infile(j2-4:j2-1),*) nutc
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datetime=infile(j2-11:j2-1)
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close(10)
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candidates=0.0
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ncand=0
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call getcandidates2(iwave,375.0,3000.0,0.2,2200.0,100,savg,candidates,ncand,sbase)
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ndecodes=0
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do icand=1,ncand
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f0=candidates(icand,1)
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xsnr=1.0
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if( f0.le.375.0 .or. f0.ge.(5000.0-375.0) ) cycle
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call ft4_downsample(iwave,f0,cd2) ! downsample from 320s/Symbol to 20s/Symbol
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s2=sum(cd2*conjg(cd2))/(20.0*76)
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if(s2.gt.0.0) cd2=cd2/sqrt(s2)
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! 750 samples/second here
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ibest=-1
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sybest=-99.
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dfbest=-1.
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do if=-30,+30
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df=if
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a=0.
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a(1)=-df
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call twkfreq1(cd2,NMAX/16,fs,a,cb)
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do istart=0,380
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csync1=0.
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cterm=1
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do ib=1,12
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i1=(ib-1)*20+istart
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if(s12(ib).eq.0) then
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csync1=csync1+sum(cb(i1:i1+19)*conjg(c0(0:19)))*cterm
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cterm=cterm*conjg(cc0)
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else
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csync1=csync1+sum(cb(i1:i1+19)*conjg(c3(0:19)))*cterm
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cterm=cterm*conjg(cc3)
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endif
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enddo
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if(abs(csync1).gt.sybest) then
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ibest=istart
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sybest=abs(csync1)
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dfbest=df
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endif
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enddo
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enddo
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a=0.
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!dfbest=1500.0-f0
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a(1)=-dfbest
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call twkfreq1(cd2,NMAX/16,fs,a,cb)
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ibest=-1
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smax=-99.
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dfbest=-1.
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do idf=-90,+90,5
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df=idf
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a=0.
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a(1)=df
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ctwk=1.
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call twkfreq1(ctwk,80,fs,a,ctwk2)
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do istart=0,315
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call sync4d(cd2,istart,ctwk2,1,sync)
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if(sync.gt.smax) then
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smax=sync
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ibest=istart
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dfbest=df
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endif
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enddo
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enddo
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f0=f0+dfbest
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!f0=1443.75
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call ft4_downsample(iwave,f0,cb) ! downsample from 320s/Symbol to 20s/Symbol
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sum2=sum(abs(cb)**2)/(20.0*76)
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if(sum2.gt.0.0) cb=cb/sqrt(sum2)
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!ibest=208
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ib=ibest
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cd=cb(ibest:ibest+76*20-1)
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do k=1,NN
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i1=(k-1)*20
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csymb=cd(i1:i1+19)
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call four2a(csymb,20,1,-1,1)
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cs(0:3,k)=csymb(1:4)/1e2
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s4(0:3,k)=abs(csymb(1:4))
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enddo
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cd=cb(ib:ib+76*20-1)
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do nseq=1,1
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if( nseq.eq.1 ) then ! noncoherent single-symbol detection
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sbits1=0.0
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do isym=1,76
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ib=(isym-1)*20
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ccor(3,isym)=sum(cd(ib:ib+19)*conjg(c3(0:19)))
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ccor(2,isym)=sum(cd(ib:ib+19)*conjg(c2(0:19)))
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ccor(1,isym)=sum(cd(ib:ib+19)*conjg(c1(0:19)))
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ccor(0,isym)=sum(cd(ib:ib+19)*conjg(c0(0:19)))
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sbits1(2*isym-1)= max(abs(ccor(2,isym)),abs(ccor(3,isym)))- &
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max(abs(ccor(0,isym)),abs(ccor(1,isym)))
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sbits1(2*isym) = max(abs(ccor(1,isym)),abs(ccor(2,isym)))- &
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max(abs(ccor(0,isym)),abs(ccor(3,isym)))
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hbits1(2*isym-1:2*isym)=0
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if(sbits1(2*isym-1).gt.0) hbits1(2*isym-1)=1
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if(sbits1(2*isym ).gt.0) hbits1(2*isym )=1
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enddo
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sbits=sbits1
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hbits=hbits1
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sbits3=sbits1
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hbits3=hbits1
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elseif( nseq.ge.2 ) then
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nbit=2*nseq-1
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numseq=2**(nbit)
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ps=0
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do ibit=nbit/2+1,144-nbit/2
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ps=0.0
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pmax=0.0
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do iseq=0,numseq-1
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csum=0.0
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cterm=1.0
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k=1
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do i=nbit-1,0,-1
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ibb=iand(iseq/(2**i),1)
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csum=csum+ccor(ibb,ibit-(nbit/2+1)+k)*cterm
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if(ibb.eq.0) cterm=cterm*cc0
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if(ibb.eq.1) cterm=cterm*cc1
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k=k+1
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enddo
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ps(iseq)=abs(csum)
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if( ps(iseq) .gt. pmax ) then
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pmax=ps(iseq)
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ibflag=1
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endif
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enddo
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if( ibflag .eq. 1 ) then
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psbest=ps
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ibflag=0
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endif
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call getbitmetric(2**(nbit/2),psbest,numseq,sbits3(ibit))
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hbits3(ibit)=0
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if(sbits3(ibit).gt.0) hbits3(ibit)=1
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enddo
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sbits=sbits3
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hbits=hbits3
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endif
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nsync_qual=count(hbits(1:24).eq.(/0,0,0,0,0,0,1,0,1,0,1,0,1,0,1,0,1,0,0,0,0,0,0,0/))
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! if(nsync_qual.lt.10) exit
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rxdata=sbits(25:152)
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rxav=sum(rxdata(1:128))/128.0
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rx2av=sum(rxdata(1:128)*rxdata(1:128))/128.0
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rxsig=sqrt(rx2av-rxav*rxav)
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rxdata=rxdata/rxsig
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sigma=0.80
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llr(1:128)=2*rxdata/(sigma*sigma)
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apmask=0
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max_iterations=40
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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) goto 888
|
||||
ndecodes=ndecodes+1
|
||||
decodes(ndecodes)=message
|
||||
nsnr=nint(xsnr)
|
||||
freq=f0+dfbest
|
||||
1210 format(a11,2i4,f6.2,f12.7,2x,a22,i3)
|
||||
write(*,1212) datetime(8:11),nsnr,ibest/750.0,freq,message,'*',nseq,nharderror,nsync_qual
|
||||
1212 format(a4,i4,2x,f5.3,f11.1,2x,a22,a1,i5,i5,i5)
|
||||
goto 888
|
||||
endif
|
||||
enddo ! nseq
|
||||
888 continue
|
||||
enddo !candidate list
|
||||
enddo !files
|
||||
! 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
|
||||
|
||||
write(*,1120)
|
||||
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
|
||||
enddo !files
|
||||
|
||||
write(*,1120)
|
||||
1120 format("<DecodeFinished>")
|
||||
|
||||
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
|
||||
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 downsample2(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 downsample2
|
||||
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)
|
||||
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
|
||||
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
|
||||
|
||||
|
|
|
|||
|
|
@ -6,9 +6,9 @@ parameter (ND=64) !Data symbols
|
|||
parameter (NS=12) !Sync symbols (12)
|
||||
parameter (NN=NS+ND) !Total channel symbols (76)
|
||||
parameter (NSPS=320) !Samples per symbol at 12000 S/s
|
||||
parameter (NZ=NSPS*NN) !Samples in full 1.92 s waveform (23040)
|
||||
parameter (NMAX=2.5*12000) !Samples in iwave (36,000)
|
||||
parameter (NFFT1=640, NH1=NFFT1/2) !Length of FFTs for symbol spectra
|
||||
parameter (NSTEP=NSPS/4) !Rough time-sync step size
|
||||
parameter (NZ=NSPS*NN) !Samples in full 2.03 s message frame (24320)
|
||||
parameter (NMAX=2.5*12000) !Samples in iwave (30,000)
|
||||
parameter (NFFT1=1280, NH1=NFFT1/2) !Length of FFTs for symbol spectra
|
||||
parameter (NSTEP=NSPS/4) !Coarse time-sync step size
|
||||
parameter (NHSYM=NMAX/NSTEP-3) !Number of symbol spectra (1/4-sym steps)
|
||||
parameter (NDOWN=16) !Downsample factor
|
||||
|
|
@ -0,0 +1,329 @@
|
|||
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)
|
||||
|
||||
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
|
||||
print*,'Usage: ft4d [-a <data_dir>] [-f fMHz] file1 [file2 ...]'
|
||||
go to 999
|
||||
endif
|
||||
iarg=1
|
||||
data_dir="."
|
||||
call getarg(iarg,arg)
|
||||
if(arg(1:2).eq.'-a') then
|
||||
call getarg(iarg+1,data_dir)
|
||||
iarg=iarg+2
|
||||
endif
|
||||
call getarg(iarg,arg)
|
||||
if(arg(1:2).eq.'-f') then
|
||||
call getarg(iarg+1,arg)
|
||||
read(arg,*) fMHz
|
||||
iarg=iarg+2
|
||||
endif
|
||||
ncoh=1
|
||||
|
||||
do ifile=iarg,nargs
|
||||
call getarg(ifile,infile)
|
||||
j2=index(infile,'.wav')
|
||||
open(10,file=infile,status='old',access='stream')
|
||||
read(10,end=999) ihdr,iwave
|
||||
read(infile(j2-4:j2-1),*) nutc
|
||||
datetime=infile(j2-11:j2-1)
|
||||
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
|
||||
enddo !files
|
||||
|
||||
write(*,1120)
|
||||
1120 format("<DecodeFinished>")
|
||||
|
||||
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
|
||||
|
||||
|
|
@ -18,6 +18,8 @@ program ft4sim
|
|||
integer itone(NN)
|
||||
integer*1 msgbits(77)
|
||||
integer*2 iwave(NMAX) !Generated full-length waveform
|
||||
integer icos4(4)
|
||||
data icos4/0,1,3,2/
|
||||
|
||||
! Get command-line argument(s)
|
||||
nargs=iargc()
|
||||
|
|
@ -48,7 +50,7 @@ program ft4sim
|
|||
twopi=8.0*atan(1.0)
|
||||
fs=12000.0 !Sample rate (Hz)
|
||||
dt=1.0/fs !Sample interval (s)
|
||||
hmod=1.000 !Modulation index (0.5 is MSK, 1.0 is FSK)
|
||||
hmod=1.0 !Modulation index (0.5 is MSK, 1.0 is FSK)
|
||||
tt=NSPS*dt !Duration of symbols (s)
|
||||
baud=1.0/tt !Keying rate (baud)
|
||||
txt=NZ*dt !Transmission length (s)
|
||||
|
|
@ -114,10 +116,6 @@ program ft4sim
|
|||
c0=cshift(c0,-k)
|
||||
ia=k
|
||||
|
||||
do i=0,NMAX-1
|
||||
write(21,*) i,real(c0(i)),imag(c0(i)),dphi(i)
|
||||
enddo
|
||||
|
||||
do ifile=1,nfiles
|
||||
c=c0
|
||||
if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c,NMAX,NWAVE,fs,delay,fspread)
|
||||
|
|
@ -15,12 +15,15 @@ subroutine genft4(msg0,ichk,msgsent,i4tone)
|
|||
character*37 message !Message to be generated
|
||||
character*37 msgsent !Message as it will be received
|
||||
character*77 c77
|
||||
integer*4 i4tone(76)
|
||||
integer*4 i4tone(76),itmp(64)
|
||||
integer*1 codeword(128)
|
||||
integer*1 msgbits(77)
|
||||
integer*1 s12(12)
|
||||
integer icos4(4)
|
||||
real*8 xi(864),xq(864),pi,twopi
|
||||
data s12/0,0,0,3,3,3,3,3,3,0,0,0/
|
||||
! data s12/1,1,1,2,2,2,2,2,2,1,1,1/
|
||||
data icos4/0,1,3,2/
|
||||
|
||||
logical unpk77_success
|
||||
|
||||
twopi=8.*atan(1.0)
|
||||
|
|
@ -56,13 +59,17 @@ subroutine genft4(msg0,ichk,msgsent,i4tone)
|
|||
! 10 3
|
||||
|
||||
!Create 144-bit channel vector:
|
||||
i4tone(1:12)=s12
|
||||
do i=1,64
|
||||
is=codeword(2*i)+2*codeword(2*i-1)
|
||||
if(is.le.1) i4tone(12+i)=is
|
||||
if(is.eq.2) i4tone(12+i)=3
|
||||
if(is.eq.3) i4tone(12+i)=2
|
||||
if(is.le.1) itmp(i)=is
|
||||
if(is.eq.2) itmp(i)=3
|
||||
if(is.eq.3) itmp(i)=2
|
||||
enddo
|
||||
i4tone(1:4)=icos4
|
||||
i4tone(5:36)=itmp(1:32)
|
||||
i4tone(37:40)=icos4
|
||||
i4tone(41:72)=itmp(33:64)
|
||||
i4tone(73:76)=icos4
|
||||
|
||||
999 return
|
||||
end subroutine genft4
|
||||
|
|
@ -1,9 +1,7 @@
|
|||
subroutine getcandidates4(id,fa,fb,syncmin,nfqso,maxcand,savg,candidate, &
|
||||
ncand,sbase)
|
||||
|
||||
! For now, hardwired to find the largest peak in the average spectrum
|
||||
|
||||
include 'ft2_params.f90'
|
||||
include 'ft4_params.f90'
|
||||
real s(NH1,NHSYM)
|
||||
real savg(NH1),savsm(NH1)
|
||||
real sbase(NH1)
|
||||
|
|
@ -11,9 +9,7 @@ subroutine getcandidates4(id,fa,fb,syncmin,nfqso,maxcand,savg,candidate, &
|
|||
complex cx(0:NH1)
|
||||
real candidate(3,maxcand)
|
||||
integer*2 id(NMAX)
|
||||
integer*1 s8(8)
|
||||
integer indx(NH1)
|
||||
data s8/0,1,1,1,0,0,1,0/
|
||||
equivalence (x,cx)
|
||||
|
||||
! Compute symbol spectra, stepping by NSTEP steps.
|
||||
|
|
@ -33,10 +29,9 @@ subroutine getcandidates4(id,fa,fb,syncmin,nfqso,maxcand,savg,candidate, &
|
|||
savg=savg + s(1:NH1,j) !Average spectrum
|
||||
enddo
|
||||
savsm=0.
|
||||
do i=2,NH1-1
|
||||
savsm(i)=sum(savg(i-1:i+1))/3.
|
||||
do i=6,NH1-5
|
||||
savsm(i)=sum(savg(i-5:i+5))/11.
|
||||
enddo
|
||||
|
||||
nfa=fa/df
|
||||
nfb=fb/df
|
||||
np=nfb-nfa+1
|
||||
|
|
@ -58,6 +53,8 @@ subroutine getcandidates4(id,fa,fb,syncmin,nfqso,maxcand,savg,candidate, &
|
|||
if(xmax.gt.1.2) then
|
||||
ncand=ncand+1
|
||||
candidate(1,ncand)=f0
|
||||
candidate(2,ncand)=-99.9
|
||||
candidate(3,ncand)=xmax
|
||||
endif
|
||||
return
|
||||
end subroutine getcandidates4
|
||||
|
|
@ -0,0 +1,54 @@
|
|||
subroutine sync4d(cd0,i0,ctwk,itwk,sync)
|
||||
|
||||
! Compute sync power for a complex, downsampled FT4 signal.
|
||||
! 20 samples per symbol
|
||||
|
||||
include 'ft4_params.f90'
|
||||
parameter(NP=NMAX/16)
|
||||
complex cd0(0:NP-1)
|
||||
complex csync(80)
|
||||
complex csync2(80)
|
||||
complex ctwk(80)
|
||||
complex z1,z2,z3
|
||||
logical first
|
||||
integer icos4(0:3)
|
||||
data icos4/0,1,3,2/
|
||||
data first/.true./
|
||||
save first,twopi,fs2,dt2,taus,baud,csync
|
||||
|
||||
p(z1)=real(z1)**2 + aimag(z1)**2 !Statement function for power
|
||||
|
||||
! Set some constants and compute the csync array.
|
||||
if( first ) then
|
||||
twopi=8.0*atan(1.0)
|
||||
fs2=12000.0/NDOWN !Sample rate after downsampling
|
||||
dt2=1/fs2 !Corresponding sample interval
|
||||
taus=20*dt2 !Symbol duration
|
||||
baud=1.0/taus !Keying rate
|
||||
k=1
|
||||
phi=0.0
|
||||
do i=0,3
|
||||
! dphi=(twopi/2.0)*(2*icos4(i)-3)*baud*dt2
|
||||
dphi=twopi*icos4(i)*baud*dt2
|
||||
do j=1,20
|
||||
csync(k)=cmplx(cos(phi),sin(phi)) !Waveform for 7x7 Costas array
|
||||
phi=mod(phi+dphi,twopi)
|
||||
k=k+1
|
||||
enddo
|
||||
enddo
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
sync=0
|
||||
i1=i0 !three Costas arrays
|
||||
i2=i0+36*20-1
|
||||
i3=i0+72*20-1
|
||||
csync2=csync
|
||||
if(itwk.eq.1) csync2=ctwk*csync2 !Tweak the frequency
|
||||
if(i1.ge.0 .and. i1+79.le.NP-1) z1=sum(cd0(i1:i1+79)*conjg(csync2))
|
||||
if(i2.ge.0 .and. i2+79.le.NP-1) z2=sum(cd0(i2:i2+79)*conjg(csync2))
|
||||
if(i3.ge.0 .and. i3+79.le.NP-1) z3=sum(cd0(i3:i3+79)*conjg(csync2))
|
||||
sync = sync + p(z1) + p(z2) + p(z3)
|
||||
|
||||
return
|
||||
end subroutine sync4d
|
||||
|
|
@ -0,0 +1,145 @@
|
|||
subroutine syncft4(iwave,nfa,nfb,syncmin,nfqso,maxcand,s,candidate, &
|
||||
ncand,sbase)
|
||||
|
||||
include 'ft4_params.f90'
|
||||
! Search over +/- 2.5s relative to 0.5s TX start time.
|
||||
parameter (JZ=20)
|
||||
complex cx(0:NH1)
|
||||
real s(NH1,NHSYM)
|
||||
real savg(NH1)
|
||||
real sbase(NH1)
|
||||
real x(NFFT1)
|
||||
real sync2d(NH1,-JZ:JZ)
|
||||
real red(NH1)
|
||||
real candidate0(3,maxcand)
|
||||
real candidate(3,maxcand)
|
||||
real dd(NMAX)
|
||||
integer jpeak(NH1)
|
||||
integer indx(NH1)
|
||||
integer ii(1)
|
||||
integer*2 iwave(NMAX)
|
||||
integer icos4(0:3)
|
||||
data icos4/0,1,3,2/ !Costas 4x4 tone pattern
|
||||
equivalence (x,cx)
|
||||
|
||||
dd=iwave/1e3
|
||||
! Compute symbol spectra, stepping by NSTEP steps.
|
||||
savg=0.
|
||||
tstep=NSTEP/12000.0
|
||||
df=12000.0/NFFT1 !3.125 Hz
|
||||
fac=1.0/300.0
|
||||
do j=1,NHSYM
|
||||
ia=(j-1)*NSTEP + 1
|
||||
ib=ia+NSPS-1
|
||||
x(1:NSPS)=fac*dd(ia:ib)
|
||||
x(NSPS+1:)=0.
|
||||
call four2a(x,NFFT1,1,-1,0) !r2c FFT
|
||||
do i=1,NH1
|
||||
s(i,j)=real(cx(i))**2 + aimag(cx(i))**2
|
||||
enddo
|
||||
savg=savg + s(1:NH1,j) !Average spectrum
|
||||
enddo
|
||||
|
||||
call baseline(savg,nfa,nfb,sbase)
|
||||
|
||||
ia=max(1,nint(nfa/df))
|
||||
ib=nint(nfb/df)
|
||||
nssy=NSPS/NSTEP ! # steps per symbol
|
||||
nfos=NFFT1/NSPS ! # frequency bin oversampling factor
|
||||
jstrt=0.25/tstep
|
||||
candidate0=0.
|
||||
k=0
|
||||
|
||||
do i=ia,ib
|
||||
do j=-JZ,+JZ
|
||||
ta=0.
|
||||
tb=0.
|
||||
tc=0.
|
||||
t0a=0.
|
||||
t0b=0.
|
||||
t0c=0.
|
||||
do n=0,3
|
||||
m=j+jstrt+nssy*n
|
||||
if(m.ge.1.and.m.le.NHSYM) then
|
||||
ta=ta + s(i+nfos*icos4(n),m)
|
||||
t0a=t0a + sum(s(i:i+nfos*3:nfos,m))
|
||||
endif
|
||||
tb=tb + s(i+nfos*icos4(n),m+nssy*36)
|
||||
t0b=t0b + sum(s(i:i+nfos*3:nfos,m+nssy*36))
|
||||
if(m+nssy*72.le.NHSYM) then
|
||||
tc=tc + s(i+nfos*icos4(n),m+nssy*72)
|
||||
t0c=t0c + sum(s(i:i+nfos*3:nfos,m+nssy*72))
|
||||
endif
|
||||
enddo
|
||||
t=ta+tb+tc
|
||||
t0=t0a+t0b+t0c
|
||||
t0=(t0-t)/3.0
|
||||
sync_abc=t/t0
|
||||
t=tb+tc
|
||||
t0=t0b+t0c
|
||||
t0=(t0-t)/3.0
|
||||
sync_bc=t/t0
|
||||
sync2d(i,j)=max(sync_abc,sync_bc)
|
||||
enddo
|
||||
enddo
|
||||
|
||||
red=0.
|
||||
do i=ia,ib
|
||||
ii=maxloc(sync2d(i,-JZ:JZ)) - 1 - JZ
|
||||
j0=ii(1)
|
||||
jpeak(i)=j0
|
||||
red(i)=sync2d(i,j0)
|
||||
enddo
|
||||
iz=ib-ia+1
|
||||
call indexx(red(ia:ib),iz,indx)
|
||||
ibase=indx(nint(0.40*iz)) - 1 + ia
|
||||
if(ibase.lt.1) ibase=1
|
||||
if(ibase.gt.nh1) ibase=nh1
|
||||
base=red(ibase)
|
||||
red=red/base
|
||||
do i=1,min(maxcand,iz)
|
||||
n=ia + indx(iz+1-i) - 1
|
||||
if(red(n).lt.syncmin.or.isnan(red(n)).or.k.eq.maxcand) exit
|
||||
k=k+1
|
||||
! candidate0(1,k)=n*df+37.5*1.5
|
||||
candidate0(1,k)=n*df
|
||||
candidate0(2,k)=(jpeak(n)-1)*tstep
|
||||
candidate0(3,k)=red(n)
|
||||
enddo
|
||||
ncand=k
|
||||
|
||||
! Put nfqso at top of list, and save only the best of near-dupe freqs.
|
||||
do i=1,ncand
|
||||
if(abs(candidate0(1,i)-nfqso).lt.10.0) candidate0(1,i)=-candidate0(1,i)
|
||||
if(i.ge.2) then
|
||||
do j=1,i-1
|
||||
fdiff=abs(candidate0(1,i))-abs(candidate0(1,j))
|
||||
if(abs(fdiff).lt.4.0) then
|
||||
if(candidate0(3,i).ge.candidate0(3,j)) candidate0(3,j)=0.
|
||||
if(candidate0(3,i).lt.candidate0(3,j)) candidate0(3,i)=0.
|
||||
endif
|
||||
enddo
|
||||
endif
|
||||
enddo
|
||||
|
||||
fac=20.0/maxval(s)
|
||||
s=fac*s
|
||||
|
||||
! Sort by sync
|
||||
! call indexx(candidate0(3,1:ncand),ncand,indx)
|
||||
! Sort by frequency
|
||||
call indexx(candidate0(1,1:ncand),ncand,indx)
|
||||
k=1
|
||||
! do i=ncand,1,-1
|
||||
do i=1,ncand
|
||||
j=indx(i)
|
||||
! if( candidate0(3,j) .ge. syncmin .and. candidate0(2,j).ge.-1.5 ) then
|
||||
if( candidate0(3,j) .ge. syncmin ) then
|
||||
candidate(2:3,k)=candidate0(2:3,j)
|
||||
candidate(1,k)=abs(candidate0(1,j))
|
||||
k=k+1
|
||||
endif
|
||||
enddo
|
||||
ncand=k-1
|
||||
return
|
||||
end subroutine syncft4
|
||||
Loading…
Reference in New Issue