mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-10-31 15:47:10 -04:00
Add ft4 files; ft4sim works, ft4d is work in progress.
This commit is contained in:
Steve Franke
parent
f447fe49e1
commit
f2dc394c84
@ -462,7 +462,7 @@ set (wsjt_FSRCS
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lib/ft8/genft8.f90
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lib/ft8/genft8.f90
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lib/genmsk_128_90.f90
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lib/genmsk_128_90.f90
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lib/genmsk40.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/genqra64.f90
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lib/genqra64.f90
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lib/ft8/genft8refsig.f90
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lib/ft8/genft8refsig.f90
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lib/genwspr.f90
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lib/genwspr.f90
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@ -508,8 +508,8 @@ set (wsjt_FSRCS
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lib/msk144signalquality.f90
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lib/msk144signalquality.f90
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lib/msk144sim.f90
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lib/msk144sim.f90
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lib/mskrtd.f90
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lib/mskrtd.f90
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lib/fsk4hf/ft2sim.f90
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lib/fsk4hf/ft4sim.f90
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lib/fsk4hf/ft2d.f90
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lib/fsk4hf/ft4d.f90
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lib/77bit/my_hash.f90
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lib/77bit/my_hash.f90
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lib/wsprd/osdwspr.f90
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lib/wsprd/osdwspr.f90
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lib/ft8/osd174_91.f90
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lib/ft8/osd174_91.f90
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@ -1261,11 +1261,11 @@ target_link_libraries (ft8sim wsjt_fort wsjt_cxx)
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add_executable (msk144sim lib/msk144sim.f90 wsjtx.rc)
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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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target_link_libraries (msk144sim wsjt_fort wsjt_cxx)
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add_executable (ft2sim lib/fsk4hf/ft2sim.f90 wsjtx.rc)
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add_executable (ft4sim lib/fsk4hf/ft4sim.f90 wsjtx.rc)
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target_link_libraries (ft2sim wsjt_fort wsjt_cxx)
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target_link_libraries (ft4sim wsjt_fort wsjt_cxx)
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add_executable (ft2d lib/fsk4hf/ft2d.f90 wsjtx.rc)
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add_executable (ft4d lib/fsk4hf/ft4d.f90 wsjtx.rc)
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target_link_libraries (ft2d wsjt_fort wsjt_cxx)
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target_link_libraries (ft4d wsjt_fort wsjt_cxx)
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endif(WSJT_BUILD_UTILS)
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endif(WSJT_BUILD_UTILS)
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@ -13,6 +13,7 @@ program ft2d
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complex c1(0:9),c0(0:9)
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complex c1(0:9),c0(0:9)
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complex ccor(0:1,144)
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complex ccor(0:1,144)
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complex csum,cterm,cc0,cc1,csync1,csync2
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complex csum,cterm,cc0,cc1,csync1,csync2
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complex csync(16),csl(0:159)
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real*8 fMHz
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real*8 fMHz
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real a(5)
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real a(5)
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@ -26,9 +27,10 @@ program ft2d
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integer*2 iwave(NMAX) !Generated full-length waveform
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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 message77(77),apmask(128),cw(128)
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integer*1 hbits(144),hbits1(144),hbits3(144)
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integer*1 hbits(144),hbits1(144),hbits3(144)
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integer*1 s16(16)
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integer*1 s16(16),s45(45)
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logical unpk77_success
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logical unpk77_success
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data s16/0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0/
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data s16/0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0/
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data s45/0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,1,0,0,1,1,1,1,0,0,1,0,0,0,1,1,0,1,0,0,0,1,1,1,0,0/
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fs=12000.0/NDOWN !Sample rate
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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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dt=1/fs !Sample interval after downsample (s)
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@ -36,7 +38,7 @@ program ft2d
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baud=1.0/tt !Keying rate for "itone" symbols (baud)
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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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txt=NZ*dt !Transmission length (s)
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twopi=8.0*atan(1.0)
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twopi=8.0*atan(1.0)
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h=0.8 !h=0.8 seems to be optimum for AWGN sensitivity (not for fading)
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h=0.800 !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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dphi=twopi/2*baud*h*dt*16 ! dt*16 is samp interval after downsample
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dphi0=-1*dphi
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dphi0=-1*dphi
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@ -52,6 +54,18 @@ program ft2d
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the=twopi*h/2.0
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the=twopi*h/2.0
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cc1=cmplx(cos(the),-sin(the))
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cc1=cmplx(cos(the),-sin(the))
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cc0=cmplx(cos(the),sin(the))
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cc0=cmplx(cos(the),sin(the))
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k=0
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do j=1,16
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dphi1=(2*s16(j)-1)*dphi
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phi1=0.0
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do i=0,9
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csl(k)=cmplx(cos(phi1),sin(phi1))
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phi1=mod(phi1+dphi1,twopi)
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k=k+1
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enddo
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enddo
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nargs=iargc()
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nargs=iargc()
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if(nargs.lt.1) then
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if(nargs.lt.1) then
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print*,'Usage: ft2d [-a <data_dir>] [-f fMHz] file1 [file2 ...]'
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print*,'Usage: ft2d [-a <data_dir>] [-f fMHz] file1 [file2 ...]'
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@ -89,6 +103,22 @@ program ft2d
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xsnr=1.0
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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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if( f0.le.375.0 .or. f0.ge.(5000.0-375.0) ) cycle
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call ft2_downsample(iwave,f0,c2) ! downsample from 160s/Symbol to 10s/Symbol
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call ft2_downsample(iwave,f0,c2) ! downsample from 160s/Symbol to 10s/Symbol
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!c2=c2/sqrt(sum(abs(c2(0:NMAX/16-1))))
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!ishift=-1
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!rccbest=-99.
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!do is=0,435
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!rcc=0.0
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! do id=10,10
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! rcc=rcc+abs(sum(conjg(c2(is:is+159-id))*c2(is+id:is+159)*csl(0:159-id)*conjg(csl(id:159))))
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! enddo
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! if(rcc.gt.rccbest) then
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! rccbest=rcc
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! ishift=is
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! endif
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!write(21,*) is,rcc
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!enddo
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! 750 samples/second here
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! 750 samples/second here
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ibest=-1
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ibest=-1
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sybest=-99.
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sybest=-99.
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@ -102,9 +132,10 @@ program ft2d
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csync1=0.
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csync1=0.
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cterm=1
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cterm=1
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do ib=1,16
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do ib=1,16
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! do ib=1,45
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i1=(ib-1)*10+is
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i1=(ib-1)*10+is
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i2=i1+136*10
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if(s16(ib).eq.1) then
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if(s16(ib).eq.1) then
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! if(s45(ib).eq.1) then
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csync1=csync1+sum(cb(i1:i1+9)*conjg(c1(0:9)))*cterm
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csync1=csync1+sum(cb(i1:i1+9)*conjg(c1(0:9)))*cterm
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cterm=cterm*cc1
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cterm=cterm*cc1
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else
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else
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@ -121,13 +152,18 @@ program ft2d
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enddo
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enddo
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a=0.
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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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a(1)=-dfbest
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call twkfreq1(c2,NMAX/16,fs,a,cb)
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call twkfreq1(c2,NMAX/16,fs,a,cb)
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!ibest=197
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ib=ibest
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ib=ibest
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cd=cb(ib:ib+144*10-1)
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cd=cb(ib:ib+144*10-1)
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s2=sum(cd*conjg(cd))/(10*144)
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s2=sum(cd*conjg(cd))/(10*144)
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cd=cd/sqrt(s2)
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cd=cd/sqrt(s2)
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do nseq=1,5
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do nseq=1,4
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if( nseq.eq.1 ) then ! noncoherent single-symbol detection
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if( nseq.eq.1 ) then ! noncoherent single-symbol detection
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sbits1=0.0
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sbits1=0.0
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do ibit=1,144
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do ibit=1,144
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@ -178,7 +214,7 @@ program ft2d
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hbits=hbits3
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hbits=hbits3
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endif
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endif
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nsync_qual=count(hbits(1:16).eq.s16)
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nsync_qual=count(hbits(1:16).eq.s16)
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if(nsync_qual.lt.10) exit
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! if(nsync_qual.lt.10) exit
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rxdata=sbits(17:144)
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rxdata=sbits(17:144)
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rxav=sum(rxdata(1:128))/128.0
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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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rx2av=sum(rxdata(1:128)*rxdata(1:128))/128.0
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@ -186,7 +222,11 @@ program ft2d
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rxdata=rxdata/rxsig
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rxdata=rxdata/rxsig
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sigma=0.80
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sigma=0.80
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llr(1:128)=2*rxdata/(sigma*sigma)
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llr(1:128)=2*rxdata/(sigma*sigma)
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!xllrmax=maxval(abs(llr))
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!write(*,*) ifile,icand,nseq,nsync_qual
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apmask=0
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apmask=0
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!apmask(1:29)=1
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!llr(1:29)=xllrmax*(2*s45(17:45)-1)
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max_iterations=40
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max_iterations=40
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do ibias=0,0
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do ibias=0,0
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llr2=llr
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llr2=llr
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@ -209,8 +249,8 @@ program ft2d
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nsnr=nint(xsnr)
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nsnr=nint(xsnr)
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freq=f0+dfbest
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freq=f0+dfbest
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1210 format(a11,2i4,f6.2,f12.7,2x,a22,i3)
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1210 format(a11,2i4,f6.2,f12.7,2x,a22,i3)
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write(*,1212) datetime(8:11),nsnr,ibest/750.0,freq,message,'*',nseq,nharderror
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write(*,1212) datetime(8:11),nsnr,ibest/750.0,freq,message,'*',nseq,nharderror,nsync_qual
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1212 format(a4,i4,f5.1,f11.1,2x,a22,a1,i5,i5)
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1212 format(a4,i4,2x,f5.3,f11.1,2x,a22,a1,i5,i5,i5)
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goto 888
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goto 888
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endif
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endif
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enddo ! nseq
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enddo ! nseq
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@ -48,7 +48,7 @@ program ft2sim
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twopi=8.0*atan(1.0)
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twopi=8.0*atan(1.0)
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fs=12000.0 !Sample rate (Hz)
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fs=12000.0 !Sample rate (Hz)
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dt=1.0/fs !Sample interval (s)
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dt=1.0/fs !Sample interval (s)
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hmod=0.8 !Modulation index (0.5 is MSK, 1.0 is FSK)
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hmod=0.800 !Modulation index (0.5 is MSK, 1.0 is FSK)
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tt=NSPS*dt !Duration of symbols (s)
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tt=NSPS*dt !Duration of symbols (s)
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baud=1.0/tt !Keying rate (baud)
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baud=1.0/tt !Keying rate (baud)
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txt=NZ*dt !Transmission length (s)
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txt=NZ*dt !Transmission length (s)
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14
lib/fsk4hf/ft4_params.f90
Normal file
14
lib/fsk4hf/ft4_params.f90
Normal file
@ -0,0 +1,14 @@
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! FT4 37.5 baud - 26.67 ms symbol duration
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! LDPC (128,90) code
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parameter (KK=90) !Information bits (77 + CRC13)
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parameter (ND=64) !Data symbols
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parameter (NS=12) !Sync symbols (12)
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parameter (NN=NS+ND) !Total channel symbols (76)
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parameter (NSPS=320) !Samples per symbol at 12000 S/s
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parameter (NZ=NSPS*NN) !Samples in full 1.92 s waveform (23040)
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parameter (NMAX=2.5*12000) !Samples in iwave (36,000)
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parameter (NFFT1=640, NH1=NFFT1/2) !Length of FFTs for symbol spectra
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parameter (NSTEP=NSPS/4) !Rough time-sync step size
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parameter (NHSYM=NMAX/NSTEP-3) !Number of symbol spectra (1/4-sym steps)
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parameter (NDOWN=16) !Downsample factor
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317
lib/fsk4hf/ft4d.f90
Normal file
317
lib/fsk4hf/ft4d.f90
Normal file
@ -0,0 +1,317 @@
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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*10-1) !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,csync1,csync2
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complex csync(12)
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real*8 fMHz
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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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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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dphi=twopi/2*baud*h*dt*16 ! dt*16 is samp interval after downsample
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dphi0=-1.5*dphi
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dphi1=-0.5*dphi
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dphi2=+0.5*dphi
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dphi3=+1.5*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=0,9
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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(phi1+dphi3,twopi)
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phi2=mod(phi1+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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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)
|
||||||
|
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)
|
||||||
|
candidates=0.0
|
||||||
|
ncand=0
|
||||||
|
call getcandidates2(iwave,375.0,3000.0,0.2,2200.0,100,savg,candidates,ncand,sbase)
|
||||||
|
ndecodes=0
|
||||||
|
do icand=1,ncand
|
||||||
|
f0=candidates(icand,1)
|
||||||
|
xsnr=1.0
|
||||||
|
if( f0.le.375.0 .or. f0.ge.(5000.0-375.0) ) cycle
|
||||||
|
call ft4_downsample(iwave,f0,cd2) ! downsample from 160s/Symbol to 10s/Symbol
|
||||||
|
|
||||||
|
! 750 samples/second here
|
||||||
|
ibest=-1
|
||||||
|
sybest=-99.
|
||||||
|
dfbest=-1.
|
||||||
|
do if=-60,+60
|
||||||
|
df=if
|
||||||
|
a=0.
|
||||||
|
a(1)=-df
|
||||||
|
call twkfreq1(cd2,NMAX/16,fs,a,cb)
|
||||||
|
do is=0,380
|
||||||
|
csync1=0.
|
||||||
|
cterm=1
|
||||||
|
do ib=1,12
|
||||||
|
i1=(ib-1)*10+is
|
||||||
|
if(s12(ib).eq.0) then
|
||||||
|
csync1=csync1+sum(cb(i1:i1+19)*conjg(c0(0:19)))*cterm
|
||||||
|
cterm=cterm*cc0
|
||||||
|
else
|
||||||
|
csync1=csync1+sum(cb(i1:i1+19)*conjg(c3(0:19)))*cterm
|
||||||
|
cterm=cterm*cc3
|
||||||
|
endif
|
||||||
|
enddo
|
||||||
|
if(abs(csync1).gt.sybest) then
|
||||||
|
ibest=is
|
||||||
|
sybest=abs(csync1)
|
||||||
|
dfbest=df
|
||||||
|
endif
|
||||||
|
enddo
|
||||||
|
enddo
|
||||||
|
|
||||||
|
a=0.
|
||||||
|
!dfbest=1500.0-f0
|
||||||
|
a(1)=-dfbest
|
||||||
|
|
||||||
|
call twkfreq1(c2,NMAX/16,fs,a,cb)
|
||||||
|
|
||||||
|
!ibest=197
|
||||||
|
ib=ibest
|
||||||
|
write(*,*) f0,f0+dfbest,ibest
|
||||||
|
goto 888
|
||||||
|
cd=cb(ib:ib+144*10-1)
|
||||||
|
s2=sum(cd*conjg(cd))/(10*144)
|
||||||
|
cd=cd/sqrt(s2)
|
||||||
|
do nseq=1,1
|
||||||
|
if( nseq.eq.1 ) then ! noncoherent single-symbol detection
|
||||||
|
sbits1=0.0
|
||||||
|
do ibit=1,76
|
||||||
|
ib=(ibit-1)*10
|
||||||
|
ccor(1,ibit)=sum(cd(ib:ib+9)*conjg(c1(0:9)))
|
||||||
|
ccor(0,ibit)=sum(cd(ib:ib+9)*conjg(c0(0:9)))
|
||||||
|
sbits1(ibit)=abs(ccor(1,ibit))-abs(ccor(0,ibit))
|
||||||
|
hbits1(ibit)=0
|
||||||
|
if(sbits1(ibit).gt.0) hbits1(ibit)=1
|
||||||
|
enddo
|
||||||
|
sbits=sbits1
|
||||||
|
hbits=hbits1
|
||||||
|
sbits3=sbits1
|
||||||
|
hbits3=hbits1
|
||||||
|
elseif( nseq.ge.2 ) then
|
||||||
|
nbit=2*nseq-1
|
||||||
|
numseq=2**(nbit)
|
||||||
|
ps=0
|
||||||
|
do ibit=nbit/2+1,144-nbit/2
|
||||||
|
ps=0.0
|
||||||
|
pmax=0.0
|
||||||
|
do iseq=0,numseq-1
|
||||||
|
csum=0.0
|
||||||
|
cterm=1.0
|
||||||
|
k=1
|
||||||
|
do i=nbit-1,0,-1
|
||||||
|
ibb=iand(iseq/(2**i),1)
|
||||||
|
csum=csum+ccor(ibb,ibit-(nbit/2+1)+k)*cterm
|
||||||
|
if(ibb.eq.0) cterm=cterm*cc0
|
||||||
|
if(ibb.eq.1) cterm=cterm*cc1
|
||||||
|
k=k+1
|
||||||
|
enddo
|
||||||
|
ps(iseq)=abs(csum)
|
||||||
|
if( ps(iseq) .gt. pmax ) then
|
||||||
|
pmax=ps(iseq)
|
||||||
|
ibflag=1
|
||||||
|
endif
|
||||||
|
enddo
|
||||||
|
if( ibflag .eq. 1 ) then
|
||||||
|
psbest=ps
|
||||||
|
ibflag=0
|
||||||
|
endif
|
||||||
|
call getbitmetric(2**(nbit/2),psbest,numseq,sbits3(ibit))
|
||||||
|
hbits3(ibit)=0
|
||||||
|
if(sbits3(ibit).gt.0) hbits3(ibit)=1
|
||||||
|
enddo
|
||||||
|
sbits=sbits3
|
||||||
|
hbits=hbits3
|
||||||
|
endif
|
||||||
|
nsync_qual=count(hbits(1:16).eq.s16)
|
||||||
|
! if(nsync_qual.lt.10) exit
|
||||||
|
rxdata=sbits(17:144)
|
||||||
|
rxav=sum(rxdata(1:128))/128.0
|
||||||
|
rx2av=sum(rxdata(1:128)*rxdata(1:128))/128.0
|
||||||
|
rxsig=sqrt(rx2av-rxav*rxav)
|
||||||
|
rxdata=rxdata/rxsig
|
||||||
|
sigma=0.80
|
||||||
|
llr(1:128)=2*rxdata/(sigma*sigma)
|
||||||
|
!xllrmax=maxval(abs(llr))
|
||||||
|
!write(*,*) ifile,icand,nseq,nsync_qual
|
||||||
|
apmask=0
|
||||||
|
!apmask(1:29)=1
|
||||||
|
!llr(1:29)=xllrmax*(2*s45(17:45)-1)
|
||||||
|
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) 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
|
||||||
|
|
||||||
|
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 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 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=4.0*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
|
||||||
|
|
||||||
158
lib/fsk4hf/ft4sim.f90
Normal file
158
lib/fsk4hf/ft4sim.f90
Normal file
@ -0,0 +1,158 @@
|
|||||||
|
program ft4sim
|
||||||
|
|
||||||
|
! Generate simulated signals for experimental "FT4" mode
|
||||||
|
|
||||||
|
use wavhdr
|
||||||
|
use packjt77
|
||||||
|
include 'ft4_params.f90' !Set various constants
|
||||||
|
parameter (NWAVE=NN*NSPS)
|
||||||
|
type(hdr) h !Header for .wav file
|
||||||
|
character arg*12,fname*17
|
||||||
|
character msg37*37,msgsent37*37
|
||||||
|
character c77*77
|
||||||
|
complex c0(0:NMAX-1)
|
||||||
|
complex c(0:NMAX-1)
|
||||||
|
real wave(NMAX)
|
||||||
|
real dphi(0:NMAX-1)
|
||||||
|
real pulse(960)
|
||||||
|
integer itone(NN)
|
||||||
|
integer*1 msgbits(77)
|
||||||
|
integer*2 iwave(NMAX) !Generated full-length waveform
|
||||||
|
|
||||||
|
! Get command-line argument(s)
|
||||||
|
nargs=iargc()
|
||||||
|
if(nargs.ne.8) then
|
||||||
|
print*,'Usage: ft4sim "message" f0 DT fdop del width nfiles snr'
|
||||||
|
print*,'Examples: ft4sim "K1ABC W9XYZ EN37" 1500.0 0.0 0.1 1.0 0 10 -18'
|
||||||
|
print*,' ft4sim "WA9XYZ/R KA1ABC/R FN42" 1500.0 0.0 0.1 1.0 0 10 -18'
|
||||||
|
print*,' ft4sim "K1ABC RR73; W9XYZ <KH1/KH7Z> -11" 300 0 0 0 25 1 -10'
|
||||||
|
go to 999
|
||||||
|
endif
|
||||||
|
call getarg(1,msg37) !Message to be transmitted
|
||||||
|
call getarg(2,arg)
|
||||||
|
read(arg,*) f0 !Frequency (only used for single-signal)
|
||||||
|
call getarg(3,arg)
|
||||||
|
read(arg,*) xdt !Time offset from nominal (s)
|
||||||
|
call getarg(4,arg)
|
||||||
|
read(arg,*) fspread !Watterson frequency spread (Hz)
|
||||||
|
call getarg(5,arg)
|
||||||
|
read(arg,*) delay !Watterson delay (ms)
|
||||||
|
call getarg(6,arg)
|
||||||
|
read(arg,*) width !Filter transition width (Hz)
|
||||||
|
call getarg(7,arg)
|
||||||
|
read(arg,*) nfiles !Number of files
|
||||||
|
call getarg(8,arg)
|
||||||
|
read(arg,*) snrdb !SNR_2500
|
||||||
|
|
||||||
|
nfiles=abs(nfiles)
|
||||||
|
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)
|
||||||
|
tt=NSPS*dt !Duration of symbols (s)
|
||||||
|
baud=1.0/tt !Keying rate (baud)
|
||||||
|
txt=NZ*dt !Transmission length (s)
|
||||||
|
|
||||||
|
bandwidth_ratio=2500.0/(fs/2.0)
|
||||||
|
sig=sqrt(2*bandwidth_ratio) * 10.0**(0.05*snrdb)
|
||||||
|
if(snrdb.gt.90.0) sig=1.0
|
||||||
|
txt=NN*NSPS/12000.0
|
||||||
|
|
||||||
|
! Source-encode, then get itone()
|
||||||
|
i3=-1
|
||||||
|
n3=-1
|
||||||
|
call pack77(msg37,i3,n3,c77)
|
||||||
|
read(c77,'(77i1)') msgbits
|
||||||
|
call genft4(msg37,0,msgsent37,itone)
|
||||||
|
write(*,*)
|
||||||
|
write(*,'(a9,a37,3x,a7,i1,a1,i1)') 'Message: ',msgsent37,'i3.n3: ',i3,'.',n3
|
||||||
|
write(*,1000) f0,xdt,txt,snrdb
|
||||||
|
1000 format('f0:',f9.3,' DT:',f6.2,' TxT:',f6.1,' SNR:',f6.1)
|
||||||
|
write(*,*)
|
||||||
|
if(i3.eq.1) then
|
||||||
|
write(*,*) ' mycall hiscall hisgrid'
|
||||||
|
write(*,'(28i1,1x,i1,1x,28i1,1x,i1,1x,i1,1x,15i1,1x,3i1)') msgbits(1:77)
|
||||||
|
else
|
||||||
|
write(*,'(a14)') 'Message bits: '
|
||||||
|
write(*,'(77i1)') msgbits
|
||||||
|
endif
|
||||||
|
write(*,*)
|
||||||
|
write(*,'(a17)') 'Channel symbols: '
|
||||||
|
write(*,'(76i1)') itone
|
||||||
|
write(*,*)
|
||||||
|
|
||||||
|
call sgran()
|
||||||
|
|
||||||
|
! The filtered frequency pulse
|
||||||
|
do i=1,960
|
||||||
|
tt=(i-480.5)/320.0
|
||||||
|
pulse(i)=gfsk_pulse(1.0,tt)
|
||||||
|
enddo
|
||||||
|
|
||||||
|
! Define the instantaneous frequency waveform
|
||||||
|
dphi_peak=twopi*(hmod/2.0)/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)
|
||||||
|
enddo
|
||||||
|
|
||||||
|
phi=0.0
|
||||||
|
c0=0.0
|
||||||
|
dphi=dphi+twopi*f0*dt
|
||||||
|
do j=0,NMAX-1
|
||||||
|
c0(j)=cmplx(cos(phi),sin(phi))
|
||||||
|
phi=mod(phi+dphi(j),twopi)
|
||||||
|
enddo
|
||||||
|
|
||||||
|
c0(0:319)=c0(0:319)*(1.0-cos(twopi*(/(i,i=0,319)/)/640.0) )/2.0
|
||||||
|
c0(77*320:77*320+319)=c0(77*320:77*320+319)*(1.0+cos(twopi*(/(i,i=0,319)/)/640.0 ))/2.0
|
||||||
|
c0(78*320:)=0.
|
||||||
|
|
||||||
|
k=nint((xdt+0.25)/dt)
|
||||||
|
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)
|
||||||
|
c=sig*c
|
||||||
|
|
||||||
|
ib=k
|
||||||
|
wave=real(c)
|
||||||
|
peak=maxval(abs(wave(ia:ib)))
|
||||||
|
nslots=1
|
||||||
|
if(width.gt.0.0) call filt8(f0,nslots,width,wave)
|
||||||
|
|
||||||
|
if(snrdb.lt.90) then
|
||||||
|
do i=1,NMAX !Add gaussian noise at specified SNR
|
||||||
|
xnoise=gran()
|
||||||
|
wave(i)=wave(i) + xnoise
|
||||||
|
enddo
|
||||||
|
endif
|
||||||
|
|
||||||
|
gain=100.0
|
||||||
|
if(snrdb.lt.90.0) then
|
||||||
|
wave=gain*wave
|
||||||
|
else
|
||||||
|
datpk=maxval(abs(wave))
|
||||||
|
fac=32766.9/datpk
|
||||||
|
wave=fac*wave
|
||||||
|
endif
|
||||||
|
if(any(abs(wave).gt.32767.0)) print*,"Warning - data will be clipped."
|
||||||
|
iwave=nint(wave)
|
||||||
|
h=default_header(12000,NMAX)
|
||||||
|
write(fname,1102) ifile
|
||||||
|
1102 format('000000_',i6.6,'.wav')
|
||||||
|
open(10,file=fname,status='unknown',access='stream')
|
||||||
|
write(10) h,iwave !Save to *.wav file
|
||||||
|
close(10)
|
||||||
|
write(*,1110) ifile,xdt,f0,snrdb,fname
|
||||||
|
1110 format(i4,f7.2,f8.2,f7.1,2x,a17)
|
||||||
|
enddo
|
||||||
|
999 end program ft4sim
|
||||||
68
lib/fsk4hf/genft4.f90
Normal file
68
lib/fsk4hf/genft4.f90
Normal file
@ -0,0 +1,68 @@
|
|||||||
|
subroutine genft4(msg0,ichk,msgsent,i4tone)
|
||||||
|
! s12 + 64symbols = 76 channel symbols 2.027s message duration
|
||||||
|
!
|
||||||
|
! Encode an FT4 message
|
||||||
|
! 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}
|
||||||
|
|
||||||
|
use iso_c_binding, only: c_loc,c_size_t
|
||||||
|
use packjt77
|
||||||
|
character*37 msg0
|
||||||
|
character*37 message !Message to be generated
|
||||||
|
character*37 msgsent !Message as it will be received
|
||||||
|
character*77 c77
|
||||||
|
integer*4 i4tone(76)
|
||||||
|
integer*1 codeword(128)
|
||||||
|
integer*1 msgbits(77)
|
||||||
|
integer*1 s12(12)
|
||||||
|
real*8 xi(864),xq(864),pi,twopi
|
||||||
|
data s12/0,0,0,3,3,3,3,3,3,0,0,0/
|
||||||
|
logical unpk77_success
|
||||||
|
|
||||||
|
twopi=8.*atan(1.0)
|
||||||
|
pi=twopi/2.0
|
||||||
|
|
||||||
|
message=msg0
|
||||||
|
|
||||||
|
do i=1, 37
|
||||||
|
if(ichar(message(i:i)).eq.0) then
|
||||||
|
message(i:37)=' '
|
||||||
|
exit
|
||||||
|
endif
|
||||||
|
enddo
|
||||||
|
do i=1,37 !Strip leading blanks
|
||||||
|
if(message(1:1).ne.' ') exit
|
||||||
|
message=message(i+1:)
|
||||||
|
enddo
|
||||||
|
|
||||||
|
i3=-1
|
||||||
|
n3=-1
|
||||||
|
call pack77(message,i3,n3,c77)
|
||||||
|
call unpack77(c77,0,msgsent,unpk77_success) !Unpack to get msgsent
|
||||||
|
|
||||||
|
if(ichk.eq.1) go to 999
|
||||||
|
read(c77,"(77i1)") msgbits
|
||||||
|
call encode_128_90(msgbits,codeword)
|
||||||
|
|
||||||
|
! Grayscale mapping:
|
||||||
|
! bits tone
|
||||||
|
! 00 0
|
||||||
|
! 01 1
|
||||||
|
! 11 2
|
||||||
|
! 10 3
|
||||||
|
|
||||||
|
!Create 144-bit channel vector:
|
||||||
|
i4tone(1:12)=s12
|
||||||
|
do i=1,64
|
||||||
|
is=codeword(2*i-1)+2*codeword(2*i)
|
||||||
|
if(is.le.1) i4tone(12+i)=is
|
||||||
|
if(is.eq.2) i4tone(12+i)=3
|
||||||
|
if(is.eq.3) i4tone(12+i)=2
|
||||||
|
enddo
|
||||||
|
|
||||||
|
999 return
|
||||||
|
end subroutine genft4
|
||||||
63
lib/fsk4hf/getcandidates4.f90
Normal file
63
lib/fsk4hf/getcandidates4.f90
Normal file
@ -0,0 +1,63 @@
|
|||||||
|
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'
|
||||||
|
real s(NH1,NHSYM)
|
||||||
|
real savg(NH1),savsm(NH1)
|
||||||
|
real sbase(NH1)
|
||||||
|
real x(NFFT1)
|
||||||
|
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.
|
||||||
|
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*id(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
|
||||||
|
savsm=0.
|
||||||
|
do i=2,NH1-1
|
||||||
|
savsm(i)=sum(savg(i-1:i+1))/3.
|
||||||
|
enddo
|
||||||
|
|
||||||
|
nfa=fa/df
|
||||||
|
nfb=fb/df
|
||||||
|
np=nfb-nfa+1
|
||||||
|
indx=0
|
||||||
|
call indexx(savsm(nfa:nfb),np,indx)
|
||||||
|
xn=savsm(nfa+indx(nint(0.3*np)))
|
||||||
|
savsm=savsm/xn
|
||||||
|
imax=-1
|
||||||
|
xmax=-99.
|
||||||
|
do i=2,NH1-1
|
||||||
|
if(savsm(i).gt.savsm(i-1).and. &
|
||||||
|
savsm(i).gt.savsm(i+1).and. &
|
||||||
|
savsm(i).gt.xmax) then
|
||||||
|
xmax=savsm(i)
|
||||||
|
imax=i
|
||||||
|
endif
|
||||||
|
enddo
|
||||||
|
f0=imax*df
|
||||||
|
if(xmax.gt.1.2) then
|
||||||
|
ncand=ncand+1
|
||||||
|
candidate(1,ncand)=f0
|
||||||
|
endif
|
||||||
|
return
|
||||||
|
end subroutine getcandidates4
|
||||||
Loading…
Reference in New Issue
Block a user