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Work in progress, starting toward implementing soft-decision ftrsd decoder.

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This commit is contained in:
Joe Taylor 2024-02-13 14:56:20 -05:00
parent 8dd19ee80c
commit a516184a3c
3 changed files with 20 additions and 1 deletions
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1
CMakeLists.txt
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@ -591,6 +591,7 @@ set (wsjt_FSRCS
lib/superfox/sfox_sync.f90
lib/superfox/sfox_demod.f90
lib/superfox/sfox_clo.f90
lib/superfox/sym_prob.f90
lib/superfox/ran1.f90
)

2
lib/superfox/sfox_demod.f90
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@ -11,10 +11,12 @@ subroutine sfox_demod(crcvd,f,t,s3,chansym)
i0=nint(12000.0*t)
df=12000.0/NSPS
j0=nint(f/df)-NQ/2
chansym=0
do n=1,ND !Loop over all symbols
ib=n*NSPS + i0
if(n.gt.ND1) ib=(NS+n)*NSPS + i0
ia=ib-NSPS+1
chansym(n)=0
if(ia.lt.1 .or. ib.gt.NMAX) cycle
c=crcvd(ia:ib)
call four2a(c,NSPS,1,-1,1) !Compute symbol spectrum

18
lib/superfox/sfoxtest.f90
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@ -13,13 +13,16 @@ program sfoxtest
complex cnoise(NMAX) !Complex noise
complex crcvd(NMAX) !Signal as received
real a(3)
real, allocatable :: s3(:,:) !Symbol spectra: will be s3(NQ,ND)
integer, allocatable :: msg0(:) !Information symbols
integer, allocatable :: parsym(:) !Parity symbols
integer, allocatable :: chansym0(:) !Encoded data, 7-bit integers
integer, allocatable :: chansym(:) !Recovered hard-decision symbols
integer, allocatable :: iera(:) !Positions of erasures
integer, allocatable :: rxdat(:)
integer, allocatable :: rxprob(:)
integer, allocatable :: rxdat2(:)
integer, allocatable :: rxprob2(:)
character fname*17,arg*12,itu*2
nargs=iargc()
@ -78,6 +81,10 @@ program sfoxtest
allocate(chansym0(1:NN))
allocate(chansym(1:NN))
allocate(iera(1:NN))
allocate(rxdat(0:ND-1))
allocate(rxprob(0:ND-1))
allocate(rxdat2(0:ND-1))
allocate(rxprob2(0:ND-1))
rms=100.
fsample=12000.0 !Sample rate (Hz)
@ -165,10 +172,19 @@ program sfoxtest
call twkfreq(crcvd,crcvd,NMAX,12000.0,a)
f=1500.0
call sfox_demod(crcvd,f,t,s3,chansym) !Get s3 and hard symbol values
call sym_prob(s3,rxdat,rxprob,rxdat2,rxprob2)
chansym(1:ND)=rxdat !### TEMPORARY ? ###
! do j=0,ND-1
! do j=0,5
! write(*,3001) j,chansym(1+j),rxdat(j),rxprob(j),rxdat2(j),rxprob2(j)
!3001 format('prob'i5,5i8)
! enddo
nera=0
chansym=mod(chansym,nq) !Enforce 0 to nq-1
nharderr=count(chansym.ne.chansym0) !Count hard errors
! nhard2=count(rxdat.ne.chansym0(1:ND)) !Count hard errors
! print*,'A',nharderr,nhard2
ntot=ntot+nharderr
nworst=max(nworst,nharderr)
call rs_decode_sf(chansym,iera,nera,nfixed) !Call the decoder