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Speed up wspr4d.

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This commit is contained in:
Steven Franke 2020-04-21 13:44:24 -05:00
parent 03efe4d54a
commit 529cc1bae1
4 changed files with 16 additions and 13 deletions
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2
CMakeLists.txt
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@ -602,7 +602,7 @@ set (wsjt_FSRCS
lib/fsk4hf/osd204.f90
lib/fsk4hf/genwsprcpm.f90
lib/fsk4hf/encode204.f90
# lib/ft8/decode174_91.f90
lib/fsk4hf/decode174_74.f90
lib/fsk4hf/ldpcsim174_91.f90
lib/fsk4hf/ldpcsim174_74.f90
lib/fsk4hf/ldpcsim174_101.f90

7
lib/fsk4hf/ldpcsim174_74.f90
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@ -98,10 +98,6 @@ program ldpcsim174_74
rx2av=sum(rxdata*rxdata)/N
rxsig=sqrt(rx2av-rxav*rxav)
rxdata=rxdata/rxsig
! To match the metric to the channel, s should be set to the noise standard deviation.
! For now, set s to the value that optimizes decode probability near threshold.
! The s parameter can be tuned to trade a few tenth's dB of threshold for an order of
! magnitude in UER
if( s .lt. 0 ) then
ss=sigma
else
@ -114,7 +110,8 @@ program ldpcsim174_74
call bpdecode174_74(llr,apmask,max_iterations,message,cw,nharderror,niterations)
dmin=0.0
if( (nharderror .lt. 0) .and. (ndeep .ge. 0) ) then
call osd174_74(llr, Keff, apmask, ndeep, message, cw, nharderror, dmin)
! call osd174_74(llr, Keff, apmask, ndeep, message, cw, nharderror, dmin)
call decode174_74(llr,Keff,ndeep,apmask,max_iterations,message,cw,nharderror,niterations,ncheck,dmin,isuper)
endif
if(nharderror.ge.0) then

2
lib/fsk4hf/osd174_74.f90
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@ -22,7 +22,7 @@ subroutine osd174_74(llr,k,apmask,ndeep,message74,cw,nhardmin,dmin)
integer indices(N),nxor(N)
integer*1 cw(N),ce(N),c0(N),hdec(N)
integer*1, allocatable :: decoded(:)
integer*1 message50(50),message74(74)
integer*1 message74(74)
integer indx(N)
real llr(N),rx(N),absrx(N)

18
lib/fsk4hf/wspr4d.f90
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@ -119,13 +119,13 @@ program wspr4d
enddo
if(smax .lt. 100.0 ) cycle
idecoded=0
do ijitter=0,4
do ijitter=0,2
if(idecoded.eq.1) exit
if(ijitter.eq.1) ioffset=20
if(ijitter.eq.2) ioffset=-20
if(ijitter.eq.3) ioffset=40
if(ijitter.eq.4) ioffset=-40
if(ijitter.eq.0) ioffset=0
if(ijitter.eq.1) ioffset=50
if(ijitter.eq.2) ioffset=-50
is0=isbest+ioffset
if(is0.lt.0) cycle
cframe=c2(is0:is0+103*416-1)
@ -168,7 +168,13 @@ program wspr4d
dmin=0.0
call bpdecode174_74(llr,apmask,max_iterations,message,cw,nhardbp,niterations)
Keff=64
if(nhardbp.lt.0) call osd174_74(llr,Keff,apmask,5,message,cw,nhardosd,dmin)
! if(nhardbp.lt.0) call osd174_74(llr,Keff,apmask,5,message,cw,nhardosd,dmin)
maxsuperits=2
ndeep=4
if(nhardbp.lt.0) then
call decode174_74(llr,Keff,ndeep,apmask,maxsuperits,message,cw,nhardosd,iter,ncheck,dmin,isuper)
endif
if(nhardbp.ge.0 .or. nhardosd.ge.0) then
write(c77,'(50i1)') message
c77(51:77)='000000000000000000000110000'