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Temporary code (### commented out ###) for calibrating SNR.

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This commit is contained in:
Joe Taylor 2024-02-16 16:11:01 -05:00
parent 40331f3c1f
commit cdcdedfe40
3 changed files with 49 additions and 10 deletions
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5
lib/superfox/ftrsd3.f90
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@ -143,10 +143,7 @@ subroutine ftrsd3(s3,chansym0,rxdat,rxprob,rxdat2,rxprob2,ntrials0, &
endif
enddo
call rs_decode_sf(workdat,era_pos,numera,nerr) !Call the decoder
do i=0,NN-1
write(60,3101) i,chansym0(i),workdat(i),workdat(i)-chansym0(i)
3101 format(4i8)
enddo
if( nerr.ge.0) then
! We have a candidate codeword. Find its hard and soft distance from
! the received word. Also find pp1 and pp2 from the full array

39
lib/superfox/plotspec.f90 Normal file
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@ -0,0 +1,39 @@
subroutine plotspec(dat)
use sfox_mod
real dat(NMAX)
real s(0:NSPS/2)
complex c(0:NSPS-1)
integer ipk(1)
nblks=NZ/NSPS
s=0.
fac=1.0/NSPS
do j=1,nblks
ib=j*NSPS
ia=ib-NSPS+1
c=fac*dat(ia:ib)
call four2a(c,NSPS,1,-1,1)
do i=0,NSPS/2
s(i)=s(i) + real(c(i))**2 + aimag(c(i))**2
enddo
enddo
df=12000.0/NSPS
ipk=maxloc(s)
f0=df*(ipk(1)-1)
p_sig_plus_noise=maxval(s)
p_noise=0.
do i=0,NSPS/2
f=i*df
if(f.le.2500+df .and. abs(f-f0).gt.0.5*df) p_noise=p_noise + s(i)
write(40,1000) f,s(i)
1000 format(2f10.3)
enddo
p_sig=p_sig_plus_noise - p_noise*df/2500.0
snr=p_sig/p_noise
snrdb=db(snr)
write(*,1100) snrdb
1100 format('Measured SNR:',f7.2)
end subroutine plotspec

15
lib/superfox/sfoxtest.f90
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@ -114,6 +114,7 @@ program sfoxtest
call rs_encode_sf(msg0,parsym) !Compute parity symbols
chansym0(0:kk-1)=msg0(1:kk)
chansym0(kk:nn-1)=parsym(1:nn-kk)
! chansym0=NQ/2 !### TEMPORARY, for SNR calibration ###
! Generate clo, the LO for sync detection
call timer('clo ',0)
@ -161,17 +162,17 @@ program sfoxtest
crcvd=0.
crcvd(1:NMAX)=cshift(sig*cdat(1:NMAX),-nint(xdt*fsample)) + cnoise
dat=aimag(sig*cdat(1:NMAX)) + xnoise !Add generated AWGN noise
fac=32767.0
if(snr.ge.90.0) iwave(1:NMAX)=nint(fac*dat(1:NMAX))
if(snr.lt.90.0) iwave(1:NMAX)=nint(rms*dat(1:NMAX))
call timer('watterso',0)
if(fspread.ne.0 .or. delay.ne.0) call watterson(crcvd,NMAX,NZ,fsample,&
delay,fspread)
call timer('watterso',1)
dat=aimag(sig*cdat(1:NMAX)) + xnoise !Add generated AWGN noise
! call plotspec(dat) !### TEMPORARY, for SNR calibration ###
fac=32767.0
if(snr.ge.90.0) iwave(1:NMAX)=nint(fac*dat(1:NMAX))
if(snr.lt.90.0) iwave(1:NMAX)=nint(rms*dat(1:NMAX))
! Find signal freq and DT
call timer('sync ',0)
call sfox_sync(crcvd,clo,nv,f,t)
@ -248,3 +249,5 @@ program sfoxtest
999 call timer('sfoxtest',101)
end program sfoxtest
! include 'plotspec.f90' !### TEMPORARY, for SNR calibration ###