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WIP on sfoxtest.

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This commit is contained in:
Joe Taylor 2024-02-07 14:24:05 -05:00
parent 8c61d303bf
commit ca5bc0e86b
3 changed files with 26 additions and 40 deletions
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2
lib/superfox/hard_symbols.f90
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@ -28,7 +28,7 @@ subroutine hard_symbols(crcvd,f,t,jdat)
jdat(n)=ipk(1)+256-64
endif
enddo
jdat(NN-1:nn)=0
! jdat(NN-1:nn)=0
return
end subroutine hard_symbols

16
lib/superfox/rs_sf.c
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@ -21,20 +21,10 @@ void rs_init_sf_(int *mm, int *nq, int *nn0, int *kk0, int *nfz)
first=0;
}
void rs_encode_sf_(int *dgen, int *sent)
// Encode the information symbols dgen[KK], producing channel symbols sent[NN].
void rs_encode_sf_(int *msg, int *parsym)
// Encode information symbols msg[KK], producing parity symbols parsym[nroots].
{
int b[256]; //These are the parity symbols
encode_rs_sf(rs_sf,dgen,b); //Compute the parity symbols
// Copy parity symbols into sent[] array, followed by information symbols
for (int i=0; i< nn; i++) {
if(i<nroots) {
sent[i]=b[i];
} else {
sent[i]=dgen[i-nroots];
}
}
encode_rs_sf(rs_sf,msg,parsym); //Compute the parity symbols
}
void rs_decode_sf_(int *recd, int *era_pos, int *numera, int *nerr)

46
lib/superfox/sfoxtest.f90
View File

@ -12,13 +12,15 @@ program sfoxtest
complex clo(NMAX) !Complex Local Oscillator
complex cnoise(NMAX) !Complex noise
complex crcvd(NMAX) !Signal as received
integer imsg(KK) !Information symbols
integer jmsg(KK) !Decoded information
integer*1 imsg1(7*KK) !Copy of imsg in 1-bit i*1 format
integer idat(NN) !Encoded data, 7-bit integers
integer jdat(NN) !Recovered hard-decision symbols
integer msg0(KK) !Information symbols
! integer msg(KK) !Decoded information
integer parsym(NN-KK) !Parity symbols
! integer*1 msg1(MM*KK) !Copy of msg0 in 1-bit i*1 format
integer chansym0(NN) !Encoded data, 7-bit integers
integer chansym(NN) !Recovered hard-decision symbols
integer iera(NN)
character fname*17,arg*12
character c357*357,c14*14 !,chkmsg*15
! character c357*357,c14*14 !,chkmsg*15
nargs=iargc()
if(nargs.ne.8) then
@ -51,23 +53,19 @@ program sfoxtest
bandwidth_ratio=2500.0/6000.0
! Generate a message
msg0=0
do i=1,KK-2
imsg(i)=i
msg0(i)=i
enddo
! Append a 14-bit CRC
imsg(KK-1:KK)=0
write(c357,'(51b7.7)') imsg(1:KK)
read(c357,'(357i1)') imsg1
call get_crc14(imsg1,7*KK,ncrc0)
write(c14,'(b14.14)') ncrc0
read(c14,'(2b7.7)') imsg(KK-1:KK)
! Append a CRC here ...
call rs_init_sf(MM,NQ,NN,KK,NFZ) !Initialize the Karn codec
call rs_encode_sf(imsg,idat) !Encode imsg into idat
call rs_encode_sf(msg0,parsym) !Compute parity symbols
chansym0(1:kk)=msg0(1:kk)
chansym0(kk+1:nn)=parsym(1:nn-kk)
! Generate cdat (SuperFox waveform) and clo (LO for sync detection)
call gen_sfox(idat,f0,fsample,syncwidth,cdat,clo)
call gen_sfox(chansym0,f0,fsample,syncwidth,cdat,clo)
do isnr=0,-30,-1
snr=isnr
@ -95,7 +93,7 @@ program sfoxtest
if(f0.eq.0.0) then
f1=1500.0 + 200.0*(ran1(idummy)-0.5)
xdt=2.0*(ran1(idummy)-0.5)
call gen_sfox(idat,f1,fsample,syncwidth,cdat,clo)
call gen_sfox(chansym0,f1,fsample,syncwidth,cdat,clo)
endif
crcvd=0.
@ -115,16 +113,13 @@ program sfoxtest
terr=t-xdt
if(abs(ferr).lt.5.0 .and. abs(terr).lt.0.01) ngoodsync=ngoodsync+1
call hard_symbols(crcvd,f,t,jdat) !Get hard symbol values
call hard_symbols(crcvd,f,t,chansym) !Get hard symbol values
nera=0
call rs_decode_sf(idat,iera,nera,jmsg,nfixed) !Call the decoder
write(c357,'(51b7.7)') jmsg(1:KK)
read(c357,'(357i1)') imsg11
call get_crc14(imsg1,7*KK,ncrc)
nharderr=count(jdat.ne.idat) !Count hard errors
chansym=mod(chansym,nq) !Enforce 0 to nq-1
nharderr=count(chansym.ne.chansym0) !Count hard errors
ntot=ntot+nharderr
nworst=max(nworst,nharderr)
call rs_decode_sf(chansym,iera,nera,nfixed) !Call the decoder
if(snrdb.ne.0) then
fname='000000_000001.wav'
@ -146,6 +141,7 @@ program sfoxtest
! write(13,1200) ifile,snr,ferr,terr,nharderr
!1200 format(i5,3f10.3,i5)
enddo ! ifile
! print*,'D'
fgoodsync=float(ngoodsync)/nfiles
fgood=float(ngood)/nfiles
if(isnr.eq.0) write(*,1300)