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Allow entry and decoding of WSPR-format message in ldpcsim174_74.

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This commit is contained in:
Joe Taylor 2020-04-13 15:43:34 -04:00
parent 5e391c7ff8
commit e82b9ffa38
2 changed files with 26 additions and 7 deletions
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2
CMakeLists.txt
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@ -603,7 +603,7 @@ set (wsjt_FSRCS
lib/fsk4hf/osd204.f90
lib/fsk4hf/genwsprcpm.f90
lib/fsk4hf/encode204.f90
lib/ft8/decode174_91.f90
# lib/ft8/decode174_91.f90
lib/fsk4hf/ldpcsim174_91.f90
lib/fsk4hf/ldpcsim174_74.f90
lib/fsk4hf/get_crc24.f90

31
lib/fsk4hf/ldpcsim174_74.f90
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@ -3,10 +3,12 @@ program ldpcsim174_74
! End-to-end test of the (174,74)/crc24 encoder and decoders.
use crc
use packjt
use packjt77
parameter(N=174, K=74, M=N-K)
character*8 arg
character*37 msg0,msg
character*77 c77
character*50 cmsg
character*24 c24
integer*1 msgbits(74)
@ -17,21 +19,22 @@ program ldpcsim174_74
integer nerrtot(174),nerrdec(174),nmpcbad(74)
real rxdata(N),llr(N)
real dllr(174),llrd(174)
data cmsg/'11111111000000001111111100000000111111110000000011'/
logical first,unpk77_success
data first/.true./
nerrtot=0
nerrdec=0
nmpcbad=0 ! Used to collect the number of errors in the message+crc part of the codeword
nargs=iargc()
if(nargs.ne.5) then
print*,'Usage: ldpcsim niter ndeep #trials s K'
print*,'e.g. ldpcsim174_74 20 5 1000 0.85 64'
if(nargs.ne.5 .and. nargs.ne.6) then
print*,'Usage: ldpcsim niter ndeep #trials s K [msg]'
print*,'e.g. ldpcsim174_74 20 5 1000 0.85 64 "K9AN EN50 37"'
print*,'s : if negative, then value is ignored and sigma is calculated from SNR.'
print*,'niter: is the number of BP iterations.'
print*,'ndeep: -1 is BP only, ndeep>=0 is OSD order'
print*,'K :is the number of message+CRC bits and must be in the range [50,74]'
print*,'WSPR-format message is optional'
return
endif
call getarg(1,arg)
@ -44,6 +47,10 @@ program ldpcsim174_74
read(arg,*) s
call getarg(5,arg)
read(arg,*) Keff
msg0='K9AN EN50 37 '
if(nargs.eq.6) call getarg(6,msg0)
call pack77(msg0,i3,n3,c77)
cmsg=c77(1:50)
rate=real(Keff)/real(N)
@ -128,6 +135,18 @@ program ldpcsim174_74
pberr=real(nberr)/(real(ntrials*N))
write(*,"(f4.1,4x,f5.1,1x,i8,1x,i8,8x,f5.2,8x,e10.3)") db,esn0,ngood,nue,ss,pberr
if(first) then
write(c77,'(50i1)') message
c77(51:77)='000000000000000000000110000'
call unpack77(c77,0,msg,unpk77_success)
if(unpk77_success) then
write(*,1100) msg(1:14)
1100 format('Decoded message: ',a14)
else
print*,'Error unpacking message'
endif
first=.false.
endif
enddo
open(unit=23,file='nerrhisto.dat',status='unknown')