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Interpolate threshold sensitivity for 50% decoding probability.

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This commit is contained in:
Joe Taylor 2024-02-08 13:06:54 -05:00
parent 4a1e6a19fc
commit ec535541db
1 changed files with 13 additions and 6 deletions
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17
lib/superfox/sfoxtest.f90
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@ -1,10 +1,9 @@
program sfoxtest program sfoxtest
! Generate and test sync waveforms for possible use in SuperFox signal. ! Generate and test possible waveforms for SuperFox signal.
use wavhdr use wavhdr
use sfox_mod use sfox_mod
! include "sfox_params.f90"
type(hdr) h !Header for .wav file type(hdr) h !Header for .wav file
integer*2 iwave(NMAX) !Generated i*2 waveform integer*2 iwave(NMAX) !Generated i*2 waveform
real*4 xnoise(NMAX) !Random noise real*4 xnoise(NMAX) !Random noise
@ -60,6 +59,7 @@ program sfoxtest
1000 format('M:',i2,' Base code: (',i3,',',i3,') NSPS:',i5, & 1000 format('M:',i2,' Base code: (',i3,',',i3,') NSPS:',i5, &
' Symbol Rate:',f7.3,' BW:',f6.0) ' Symbol Rate:',f7.3,' BW:',f6.0)
! Allocate storage for arrays that depend on code parameters.
allocate(msg0(1:KK)) allocate(msg0(1:KK))
allocate(parsym(1:NN-KK)) allocate(parsym(1:NN-KK))
allocate(chansym0(1:NN)) allocate(chansym0(1:NN))
@ -84,6 +84,7 @@ program sfoxtest
call rs_encode_sf(msg0,parsym) !Compute parity symbols call rs_encode_sf(msg0,parsym) !Compute parity symbols
chansym0(1:kk)=msg0(1:kk) chansym0(1:kk)=msg0(1:kk)
chansym0(kk+1:nn)=parsym(1:nn-kk) chansym0(kk+1:nn)=parsym(1:nn-kk)
fgood0=1.0
! Generate cdat (SuperFox waveform) and clo (LO for sync detection) ! Generate cdat (SuperFox waveform) and clo (LO for sync detection)
call gen_sfox(chansym0,f0,fsample,syncwidth,cdat,clo) call gen_sfox(chansym0,f0,fsample,syncwidth,cdat,clo)
@ -167,10 +168,7 @@ program sfoxtest
maxerr=(nn-kk)/2 maxerr=(nn-kk)/2
if(nharderr.le.maxerr) ngood=ngood+1 if(nharderr.le.maxerr) ngood=ngood+1
! write(13,1200) ifile,snr,ferr,terr,nharderr
!1200 format(i5,3f10.3,i5)
enddo ! ifile enddo ! ifile
! print*,'D'
fgoodsync=float(ngoodsync)/nfiles fgoodsync=float(ngoodsync)/nfiles
fgood=float(ngood)/nfiles fgood=float(ngood)/nfiles
if(isnr.eq.0) write(*,1300) if(isnr.eq.0) write(*,1300)
@ -179,8 +177,17 @@ program sfoxtest
ave_harderr=float(ntot)/nfiles ave_harderr=float(ntot)/nfiles
write(*,1310) snr,nfiles,fgoodsync,fgood,ave_harderr,nworst write(*,1310) snr,nfiles,fgoodsync,fgood,ave_harderr,nworst
1310 format(f7.2,i6,2f7.2,f7.1,i6) 1310 format(f7.2,i6,2f7.2,f7.1,i6)
if(snrdb.eq.0 .and. fgood.le.0.5 .and. fgood0.gt.0.5) then
threshold=isnr+1 - (fgood0-0.50)/(fgood0-fgood)
endif
fgood0=fgood
if(snrdb.ne.0.0) exit if(snrdb.ne.0.0) exit
if(fgoodsync.lt.0.5) exit if(fgoodsync.lt.0.5) exit
enddo ! isnr enddo ! isnr
write(*,1320) threshold
1320 format('Threshold sensitivity (50% decoding):',f6.1)
999 end program sfoxtest 999 end program sfoxtest