mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-02-03 09:44:24 -05:00
Trying to re-implement osd for wspr.
This commit is contained in:
parent
c03e3d5186
commit
fa1822bb4a
@ -521,6 +521,7 @@ set (wsjt_FSRCS
|
||||
lib/fsk4hf/msksoftsymw.f90
|
||||
lib/ft8/osd174.f90
|
||||
lib/fsk4hf/osd300.f90
|
||||
lib/fsk4hf/osdwspr.f90
|
||||
lib/pctile.f90
|
||||
lib/peakdt9.f90
|
||||
lib/peakup.f90
|
||||
@ -565,6 +566,7 @@ set (wsjt_FSRCS
|
||||
lib/sync9f.f90
|
||||
lib/sync9w.f90
|
||||
lib/synciscat.f90
|
||||
lib/fsk4hf/tccsim.f90
|
||||
lib/timf2.f90
|
||||
lib/to_contest_msg.f90
|
||||
lib/tweak1.f90
|
||||
@ -586,6 +588,8 @@ set (wsjt_FSRCS
|
||||
lib/fsk4hf/wspr_fsk8_wav.f90
|
||||
lib/fsk4hf/wspr_fsk8_downsample.f90
|
||||
lib/fsk4hf/wsprlfsim.f90
|
||||
lib/fsk4hf/wsprsimf.f90
|
||||
lib/fsk4hf/wspr_wav.f90
|
||||
lib/wspr_downsample.f90
|
||||
lib/zplot9.f90
|
||||
)
|
||||
@ -1232,9 +1236,15 @@ target_link_libraries (ft8code wsjt_fort wsjt_cxx)
|
||||
add_executable (ft8sim lib/ft8/ft8sim.f90 wsjtx.rc)
|
||||
target_link_libraries (ft8sim wsjt_fort wsjt_cxx)
|
||||
|
||||
add_executable (tccsim lib/fsk4hf/tccsim.f90 wsjtx.rc)
|
||||
target_link_libraries (tccsim wsjt_fort wsjt_cxx)
|
||||
|
||||
add_executable (wsprlfsim lib/fsk4hf/wsprlfsim.f90 wsjtx.rc)
|
||||
target_link_libraries (wsprlfsim wsjt_fort wsjt_cxx)
|
||||
|
||||
add_executable (wsprsimf lib/fsk4hf/wsprsimf.f90 wsjtx.rc)
|
||||
target_link_libraries (wsprsimf wsjt_fort wsjt_cxx)
|
||||
|
||||
add_executable (wspr_fsk8d lib/fsk4hf/wspr_fsk8d.f90 wsjtx.rc)
|
||||
target_link_libraries (wspr_fsk8d wsjt_fort wsjt_cxx)
|
||||
|
||||
|
56
lib/fsk4hf/encode4K25A.f90
Normal file
56
lib/fsk4hf/encode4K25A.f90
Normal file
@ -0,0 +1,56 @@
|
||||
subroutine encode4K25A(message,codeword)
|
||||
! A (280,70) rate 1/4 tailbiting convolutional code using
|
||||
! the "4K25A" polynomials from EbNaut website.
|
||||
! Code is transparent, has constraint length 25, and has dmin=58
|
||||
character*10 g1,g2,g3,g4
|
||||
integer*1 codeword(280)
|
||||
!integer*1 p1(25),p2(25),p3(25),p4(25)
|
||||
integer*1 p1(16),p2(16),p3(16),p4(16)
|
||||
integer*1 gg(100)
|
||||
integer*1 gen(280,70)
|
||||
integer*1 itmp(280)
|
||||
integer*1 message(70)
|
||||
logical first
|
||||
data first/.true./
|
||||
data g1/"106042635"/
|
||||
data g2/"125445117"/
|
||||
data g3/"152646773"/
|
||||
data g4/"167561761"/
|
||||
!data p1/1,0,0,0,1,1,0,0,0,0,1,0,0,0,1,0,1,1,0,0,1,1,1,0,1/
|
||||
!data p2/1,0,1,0,1,0,1,1,0,0,1,0,0,1,0,1,0,0,1,0,0,1,1,1,1/
|
||||
!data p3/1,1,0,1,0,1,0,1,1,0,1,0,0,1,1,0,1,1,1,1,1,1,0,1,1/
|
||||
!data p4/1,1,1,0,1,1,1,1,0,1,1,1,0,0,0,1,1,1,1,1,1,0,0,0,1/
|
||||
data p1/1,0,1,0,1,1,0,0,1,1,0,1,1,1,1,1/
|
||||
data p2/1,0,1,1,0,1,0,0,1,1,1,1,1,0,0,1/
|
||||
data p3/1,1,0,0,1,0,1,1,0,1,1,1,0,0,1,1/
|
||||
data p4/1,1,1,0,1,1,0,1,1,1,1,0,0,1,0,1/
|
||||
|
||||
save first,gen
|
||||
|
||||
if( first ) then ! fill the generator matrix
|
||||
gg=0
|
||||
! gg(1:25)=p1
|
||||
! gg(26:50)=p2
|
||||
! gg(51:75)=p3
|
||||
! gg(76:100)=p4
|
||||
gg(1:16)=p1
|
||||
gg(17:32)=p2
|
||||
gg(33:48)=p3
|
||||
gg(49:64)=p4
|
||||
gen=0
|
||||
! gen(1:100,1)=gg(1:100)
|
||||
gen(1:64,1)=gg(1:64)
|
||||
do i=2,70
|
||||
gen(:,i)=cshift(gen(:,i-1),-4,1)
|
||||
enddo
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
codeword=0
|
||||
do i=1,70
|
||||
if(message(i).eq.1) codeword=codeword+gen(:,i)
|
||||
enddo
|
||||
codeword=mod(codeword,2)
|
||||
|
||||
return
|
||||
end subroutine encode4K25A
|
372
lib/fsk4hf/osdtbcc.f90
Normal file
372
lib/fsk4hf/osdtbcc.f90
Normal file
@ -0,0 +1,372 @@
|
||||
subroutine osdtbcc(llr,apmask,ndeep,decoded,cw,nhardmin,dmin)
|
||||
!
|
||||
use iso_c_binding
|
||||
parameter (N=280, K=70, L=16)
|
||||
|
||||
integer*1 p1(L),p2(L),p3(L),p4(L)
|
||||
integer*1 gg(100)
|
||||
|
||||
integer*1 apmask(N),apmaskr(N)
|
||||
integer*1 gen(K,N)
|
||||
integer*1 genmrb(K,N),g2(N,K)
|
||||
integer*1 temp(K),m0(K),me(K),mi(K),misub(K),e2sub(N-K),e2(N-K),ui(N-K)
|
||||
integer*1 r2pat(N-K)
|
||||
integer indices(N),nxor(N)
|
||||
integer*1 cw(N),ce(N),c0(N),hdec(N)
|
||||
integer*1 decoded(K)
|
||||
integer indx(N)
|
||||
real llr(N),rx(N),absrx(N)
|
||||
logical first,reset
|
||||
data first/.true./
|
||||
!data p1/1,0,0,0,1,1,0,0,0,0,1,0,0,0,1,0,1,1,0,0,1,1,1,0,1/
|
||||
!data p2/1,0,1,0,1,0,1,1,0,0,1,0,0,1,0,1,0,0,1,0,0,1,1,1,1/
|
||||
!data p3/1,1,0,1,0,1,0,1,1,0,1,0,0,1,1,0,1,1,1,1,1,1,0,1,1/
|
||||
!data p4/1,1,1,0,1,1,1,1,0,1,1,1,0,0,0,1,1,1,1,1,1,0,0,0,1/
|
||||
data p1/1,0,1,0,1,1,0,0,1,1,0,1,1,1,1,1/
|
||||
data p2/1,0,1,1,0,1,0,0,1,1,1,1,1,0,0,1/
|
||||
data p3/1,1,0,0,1,0,1,1,0,1,1,1,0,0,1,1/
|
||||
data p4/1,1,1,0,1,1,0,1,1,1,1,0,0,1,0,1/
|
||||
|
||||
save first,gen
|
||||
|
||||
if( first ) then ! fill the generator matrix
|
||||
gg=0
|
||||
gg(1:L)=p1
|
||||
gg(L+1:2*L)=p2
|
||||
gg(2*L+1:3*L)=p3
|
||||
gg(3*L+1:4*L)=p4
|
||||
gen=0
|
||||
gen(1,1:4*L)=gg(1:4*L)
|
||||
do i=2,K
|
||||
gen(i,:)=cshift(gen(i-1,:),-4)
|
||||
enddo
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
! Re-order received vector to place systematic msg bits at the end.
|
||||
rx=llr
|
||||
apmaskr=apmask
|
||||
|
||||
! Hard decisions on the received word.
|
||||
hdec=0
|
||||
where(rx .ge. 0) hdec=1
|
||||
|
||||
! Use magnitude of received symbols as a measure of reliability.
|
||||
absrx=abs(rx)
|
||||
call indexx(absrx,N,indx)
|
||||
|
||||
! Re-order the columns of the generator matrix in order of decreasing reliability.
|
||||
do i=1,N
|
||||
genmrb(1:K,i)=gen(1:K,indx(N+1-i))
|
||||
indices(i)=indx(N+1-i)
|
||||
enddo
|
||||
|
||||
! Do gaussian elimination to create a generator matrix with the most reliable
|
||||
! received bits in positions 1:K in order of decreasing reliability (more or less).
|
||||
do id=1,K ! diagonal element indices
|
||||
do icol=id,K+20 ! The 20 is ad hoc - beware
|
||||
iflag=0
|
||||
if( genmrb(id,icol) .eq. 1 ) then
|
||||
iflag=1
|
||||
if( icol .ne. id ) then ! reorder column
|
||||
temp(1:K)=genmrb(1:K,id)
|
||||
genmrb(1:K,id)=genmrb(1:K,icol)
|
||||
genmrb(1:K,icol)=temp(1:K)
|
||||
itmp=indices(id)
|
||||
indices(id)=indices(icol)
|
||||
indices(icol)=itmp
|
||||
endif
|
||||
do ii=1,K
|
||||
if( ii .ne. id .and. genmrb(ii,id) .eq. 1 ) then
|
||||
genmrb(ii,1:N)=ieor(genmrb(ii,1:N),genmrb(id,1:N))
|
||||
endif
|
||||
enddo
|
||||
exit
|
||||
endif
|
||||
enddo
|
||||
enddo
|
||||
|
||||
g2=transpose(genmrb)
|
||||
|
||||
! The hard decisions for the K MRB bits define the order 0 message, m0.
|
||||
! Encode m0 using the modified generator matrix to find the "order 0" codeword.
|
||||
! Flip various combinations of bits in m0 and re-encode to generate a list of
|
||||
! codewords. Return the member of the list that has the smallest Euclidean
|
||||
! distance to the received word.
|
||||
|
||||
hdec=hdec(indices) ! hard decisions from received symbols
|
||||
m0=hdec(1:K) ! zero'th order message
|
||||
absrx=absrx(indices)
|
||||
rx=rx(indices)
|
||||
apmaskr=apmaskr(indices)
|
||||
|
||||
call mrbencode(m0,c0,g2,N,K)
|
||||
nxor=ieor(c0,hdec)
|
||||
nhardmin=sum(nxor)
|
||||
dmin=sum(nxor*absrx)
|
||||
|
||||
cw=c0
|
||||
ntotal=0
|
||||
nrejected=0
|
||||
|
||||
if(ndeep.eq.0) goto 998 ! norder=0
|
||||
if(ndeep.gt.5) ndeep=5
|
||||
if( ndeep.eq. 1) then
|
||||
nord=1
|
||||
npre1=0
|
||||
npre2=0
|
||||
nt=120
|
||||
ntheta=12
|
||||
elseif(ndeep.eq.2) then
|
||||
nord=1
|
||||
npre1=1
|
||||
npre2=0
|
||||
nt=120
|
||||
ntheta=12
|
||||
elseif(ndeep.eq.3) then
|
||||
nord=1
|
||||
npre1=1
|
||||
npre2=1
|
||||
nt=120
|
||||
ntheta=12
|
||||
ntau=15
|
||||
elseif(ndeep.eq.4) then
|
||||
nord=2
|
||||
npre1=1
|
||||
npre2=0
|
||||
nt=120
|
||||
ntheta=12
|
||||
ntau=15
|
||||
elseif(ndeep.eq.5) then
|
||||
nord=3
|
||||
npre1=1
|
||||
npre2=1
|
||||
nt=80
|
||||
ntheta=22
|
||||
ntau=16
|
||||
endif
|
||||
|
||||
do iorder=1,nord
|
||||
misub(1:K-iorder)=0
|
||||
misub(K-iorder+1:K)=1
|
||||
iflag=K-iorder+1
|
||||
do while(iflag .ge.0)
|
||||
if(iorder.eq.nord .and. npre1.eq.0) then
|
||||
iend=iflag
|
||||
else
|
||||
iend=1
|
||||
endif
|
||||
do n1=iflag,iend,-1
|
||||
mi=misub
|
||||
mi(n1)=1
|
||||
if(any(iand(apmaskr(1:K),mi).eq.1)) cycle
|
||||
ntotal=ntotal+1
|
||||
me=ieor(m0,mi)
|
||||
if(n1.eq.iflag) then
|
||||
call mrbencode(me,ce,g2,N,K)
|
||||
e2sub=ieor(ce(K+1:N),hdec(K+1:N))
|
||||
e2=e2sub
|
||||
nd1Kpt=sum(e2sub(1:nt))+1
|
||||
d1=sum(ieor(me(1:K),hdec(1:K))*absrx(1:K))
|
||||
else
|
||||
e2=ieor(e2sub,g2(K+1:N,n1))
|
||||
nd1Kpt=sum(e2(1:nt))+2
|
||||
endif
|
||||
if(nd1Kpt .le. ntheta) then
|
||||
call mrbencode(me,ce,g2,N,K)
|
||||
nxor=ieor(ce,hdec)
|
||||
if(n1.eq.iflag) then
|
||||
dd=d1+sum(e2sub*absrx(K+1:N))
|
||||
else
|
||||
dd=d1+ieor(ce(n1),hdec(n1))*absrx(n1)+sum(e2*absrx(K+1:N))
|
||||
endif
|
||||
if( dd .lt. dmin ) then
|
||||
dmin=dd
|
||||
cw=ce
|
||||
nhardmin=sum(nxor)
|
||||
nd1Kptbest=nd1Kpt
|
||||
endif
|
||||
else
|
||||
nrejected=nrejected+1
|
||||
endif
|
||||
enddo
|
||||
! Get the next test error pattern, iflag will go negative
|
||||
! when the last pattern with weight iorder has been generated.
|
||||
call nextpat(misub,k,iorder,iflag)
|
||||
enddo
|
||||
enddo
|
||||
|
||||
if(npre2.eq.1) then
|
||||
reset=.true.
|
||||
ntotal=0
|
||||
do i1=K,1,-1
|
||||
do i2=i1-1,1,-1
|
||||
ntotal=ntotal+1
|
||||
mi(1:ntau)=ieor(g2(K+1:K+ntau,i1),g2(K+1:K+ntau,i2))
|
||||
call boxit(reset,mi(1:ntau),ntau,ntotal,i1,i2)
|
||||
enddo
|
||||
enddo
|
||||
|
||||
ncount2=0
|
||||
ntotal2=0
|
||||
reset=.true.
|
||||
! Now run through again and do the second pre-processing rule
|
||||
misub(1:K-nord)=0
|
||||
misub(K-nord+1:K)=1
|
||||
iflag=K-nord+1
|
||||
do while(iflag .ge.0)
|
||||
me=ieor(m0,misub)
|
||||
call mrbencode(me,ce,g2,N,K)
|
||||
e2sub=ieor(ce(K+1:N),hdec(K+1:N))
|
||||
do i2=0,ntau
|
||||
ntotal2=ntotal2+1
|
||||
ui=0
|
||||
if(i2.gt.0) ui(i2)=1
|
||||
r2pat=ieor(e2sub,ui)
|
||||
778 continue
|
||||
call fetchit(reset,r2pat(1:ntau),ntau,in1,in2)
|
||||
if(in1.gt.0.and.in2.gt.0) then
|
||||
ncount2=ncount2+1
|
||||
mi=misub
|
||||
mi(in1)=1
|
||||
mi(in2)=1
|
||||
if(sum(mi).lt.nord+npre1+npre2.or.any(iand(apmaskr(1:K),mi).eq.1)) cycle
|
||||
me=ieor(m0,mi)
|
||||
call mrbencode(me,ce,g2,N,K)
|
||||
nxor=ieor(ce,hdec)
|
||||
dd=sum(nxor*absrx)
|
||||
if( dd .lt. dmin ) then
|
||||
dmin=dd
|
||||
cw=ce
|
||||
nhardmin=sum(nxor)
|
||||
endif
|
||||
goto 778
|
||||
endif
|
||||
enddo
|
||||
call nextpat(misub,K,nord,iflag)
|
||||
enddo
|
||||
endif
|
||||
|
||||
998 continue
|
||||
! Re-order the codeword to place message bits at the end.
|
||||
cw(indices)=cw
|
||||
hdec(indices)=hdec
|
||||
decoded=0
|
||||
return
|
||||
end subroutine osdtbcc
|
||||
|
||||
subroutine mrbencode(me,codeword,g2,N,K)
|
||||
integer*1 me(K),codeword(N),g2(N,K)
|
||||
! fast encoding for low-weight test patterns
|
||||
codeword=0
|
||||
do i=1,K
|
||||
if( me(i) .eq. 1 ) then
|
||||
codeword=ieor(codeword,g2(1:N,i))
|
||||
endif
|
||||
enddo
|
||||
return
|
||||
end subroutine mrbencode
|
||||
|
||||
subroutine nextpat(mi,k,iorder,iflag)
|
||||
integer*1 mi(k),ms(k)
|
||||
! generate the next test error pattern
|
||||
ind=-1
|
||||
do i=1,k-1
|
||||
if( mi(i).eq.0 .and. mi(i+1).eq.1) ind=i
|
||||
enddo
|
||||
if( ind .lt. 0 ) then ! no more patterns of this order
|
||||
iflag=ind
|
||||
return
|
||||
endif
|
||||
ms=0
|
||||
ms(1:ind-1)=mi(1:ind-1)
|
||||
ms(ind)=1
|
||||
ms(ind+1)=0
|
||||
if( ind+1 .lt. k ) then
|
||||
nz=iorder-sum(ms)
|
||||
ms(k-nz+1:k)=1
|
||||
endif
|
||||
mi=ms
|
||||
do i=1,k ! iflag will point to the lowest-index 1 in mi
|
||||
if(mi(i).eq.1) then
|
||||
iflag=i
|
||||
exit
|
||||
endif
|
||||
enddo
|
||||
return
|
||||
end subroutine nextpat
|
||||
|
||||
subroutine boxit(reset,e2,ntau,npindex,i1,i2)
|
||||
integer*1 e2(1:ntau)
|
||||
integer indexes(4000,2),fp(0:525000),np(4000)
|
||||
logical reset
|
||||
common/boxes/indexes,fp,np
|
||||
|
||||
if(reset) then
|
||||
patterns=-1
|
||||
fp=-1
|
||||
np=-1
|
||||
sc=-1
|
||||
indexes=-1
|
||||
reset=.false.
|
||||
endif
|
||||
|
||||
indexes(npindex,1)=i1
|
||||
indexes(npindex,2)=i2
|
||||
ipat=0
|
||||
do i=1,ntau
|
||||
if(e2(i).eq.1) then
|
||||
ipat=ipat+ishft(1,ntau-i)
|
||||
endif
|
||||
enddo
|
||||
|
||||
ip=fp(ipat) ! see what's currently stored in fp(ipat)
|
||||
if(ip.eq.-1) then
|
||||
fp(ipat)=npindex
|
||||
else
|
||||
do while (np(ip).ne.-1)
|
||||
ip=np(ip)
|
||||
enddo
|
||||
np(ip)=npindex
|
||||
endif
|
||||
return
|
||||
end subroutine boxit
|
||||
|
||||
subroutine fetchit(reset,e2,ntau,i1,i2)
|
||||
integer indexes(4000,2),fp(0:525000),np(4000)
|
||||
integer lastpat
|
||||
integer*1 e2(ntau)
|
||||
logical reset
|
||||
common/boxes/indexes,fp,np
|
||||
save lastpat,inext
|
||||
|
||||
if(reset) then
|
||||
lastpat=-1
|
||||
reset=.false.
|
||||
endif
|
||||
|
||||
ipat=0
|
||||
do i=1,ntau
|
||||
if(e2(i).eq.1) then
|
||||
ipat=ipat+ishft(1,ntau-i)
|
||||
endif
|
||||
enddo
|
||||
index=fp(ipat)
|
||||
|
||||
if(lastpat.ne.ipat .and. index.gt.0) then ! return first set of indices
|
||||
i1=indexes(index,1)
|
||||
i2=indexes(index,2)
|
||||
inext=np(index)
|
||||
elseif(lastpat.eq.ipat .and. inext.gt.0) then
|
||||
i1=indexes(inext,1)
|
||||
i2=indexes(inext,2)
|
||||
inext=np(inext)
|
||||
else
|
||||
i1=-1
|
||||
i2=-1
|
||||
inext=-1
|
||||
endif
|
||||
lastpat=ipat
|
||||
return
|
||||
end subroutine fetchit
|
||||
|
374
lib/fsk4hf/osdwspr.f90
Normal file
374
lib/fsk4hf/osdwspr.f90
Normal file
@ -0,0 +1,374 @@
|
||||
subroutine osdwspr(llr,apmask,ndeep,decoded,cw,nhardmin,dmin)
|
||||
!
|
||||
use iso_c_binding
|
||||
parameter (N=162, K=50, L=32)
|
||||
|
||||
!integer*1 p1(L),p2(L),p3(L),p4(L)
|
||||
integer*1 gg(64)
|
||||
|
||||
integer*1 apmask(N),apmaskr(N)
|
||||
integer*1 gen(K,N)
|
||||
integer*1 genmrb(K,N),g2(N,K)
|
||||
integer*1 temp(K),m0(K),me(K),mi(K),misub(K),e2sub(N-K),e2(N-K),ui(N-K)
|
||||
integer*1 r2pat(N-K)
|
||||
integer indices(N),nxor(N)
|
||||
integer*1 cw(N),ce(N),c0(N),hdec(N)
|
||||
integer*1 decoded(K)
|
||||
integer indx(N)
|
||||
real llr(N),rx(N),absrx(N)
|
||||
logical first,reset
|
||||
data first/.true./
|
||||
!data p1/1,0,0,0,1,1,0,0,0,0,1,0,0,0,1,0,1,1,0,0,1,1,1,0,1/
|
||||
!data p2/1,0,1,0,1,0,1,1,0,0,1,0,0,1,0,1,0,0,1,0,0,1,1,1,1/
|
||||
!data p3/1,1,0,1,0,1,0,1,1,0,1,0,0,1,1,0,1,1,1,1,1,1,0,1,1/
|
||||
!data p4/1,1,1,0,1,1,1,1,0,1,1,1,0,0,0,1,1,1,1,1,1,0,0,0,1/
|
||||
!data p1/1,0,1,0,1,1,0,0,1,1,0,1,1,1,1,1/
|
||||
!data p2/1,0,1,1,0,1,0,0,1,1,1,1,1,0,0,1/
|
||||
!data p3/1,1,0,0,1,0,1,1,0,1,1,1,0,0,1,1/
|
||||
!data p4/1,1,1,0,1,1,0,1,1,1,1,0,0,1,0,1/
|
||||
data gg/1,1,0,1,0,1,0,0,1,0,0,0,1,1,0,0,1,0,1,0,0,1,0,1,1,1,0,1,1,0,0,0, &
|
||||
0,1,0,0,0,0,0,0,1,0,0,1,1,1,1,0,0,0,1,0,0,1,0,0,1,0,1,1,1,1,1,1/
|
||||
|
||||
save first,gen
|
||||
|
||||
if( first ) then ! fill the generator matrix
|
||||
! gg=0
|
||||
! gg(1:L)=p1
|
||||
! gg(L+1:2*L)=p2
|
||||
! gg(2*L+1:3*L)=p3
|
||||
! gg(3*L+1:4*L)=p4
|
||||
gen=0
|
||||
gen(1,1:2*L)=gg(1:2*L)
|
||||
do i=2,K
|
||||
gen(i,:)=cshift(gen(i-1,:),-2)
|
||||
enddo
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
! Re-order received vector to place systematic msg bits at the end.
|
||||
rx=llr
|
||||
apmaskr=apmask
|
||||
|
||||
! Hard decisions on the received word.
|
||||
hdec=0
|
||||
where(rx .ge. 0) hdec=1
|
||||
|
||||
! Use magnitude of received symbols as a measure of reliability.
|
||||
absrx=abs(rx)
|
||||
call indexx(absrx,N,indx)
|
||||
|
||||
! Re-order the columns of the generator matrix in order of decreasing reliability.
|
||||
do i=1,N
|
||||
genmrb(1:K,i)=gen(1:K,indx(N+1-i))
|
||||
indices(i)=indx(N+1-i)
|
||||
enddo
|
||||
|
||||
! Do gaussian elimination to create a generator matrix with the most reliable
|
||||
! received bits in positions 1:K in order of decreasing reliability (more or less).
|
||||
do id=1,K ! diagonal element indices
|
||||
do icol=id,K+20 ! The 20 is ad hoc - beware
|
||||
iflag=0
|
||||
if( genmrb(id,icol) .eq. 1 ) then
|
||||
iflag=1
|
||||
if( icol .ne. id ) then ! reorder column
|
||||
temp(1:K)=genmrb(1:K,id)
|
||||
genmrb(1:K,id)=genmrb(1:K,icol)
|
||||
genmrb(1:K,icol)=temp(1:K)
|
||||
itmp=indices(id)
|
||||
indices(id)=indices(icol)
|
||||
indices(icol)=itmp
|
||||
endif
|
||||
do ii=1,K
|
||||
if( ii .ne. id .and. genmrb(ii,id) .eq. 1 ) then
|
||||
genmrb(ii,1:N)=ieor(genmrb(ii,1:N),genmrb(id,1:N))
|
||||
endif
|
||||
enddo
|
||||
exit
|
||||
endif
|
||||
enddo
|
||||
enddo
|
||||
|
||||
g2=transpose(genmrb)
|
||||
|
||||
! The hard decisions for the K MRB bits define the order 0 message, m0.
|
||||
! Encode m0 using the modified generator matrix to find the "order 0" codeword.
|
||||
! Flip various combinations of bits in m0 and re-encode to generate a list of
|
||||
! codewords. Return the member of the list that has the smallest Euclidean
|
||||
! distance to the received word.
|
||||
|
||||
hdec=hdec(indices) ! hard decisions from received symbols
|
||||
m0=hdec(1:K) ! zero'th order message
|
||||
absrx=absrx(indices)
|
||||
rx=rx(indices)
|
||||
apmaskr=apmaskr(indices)
|
||||
|
||||
call mrbencode(m0,c0,g2,N,K)
|
||||
nxor=ieor(c0,hdec)
|
||||
nhardmin=sum(nxor)
|
||||
dmin=sum(nxor*absrx)
|
||||
|
||||
cw=c0
|
||||
ntotal=0
|
||||
nrejected=0
|
||||
|
||||
if(ndeep.eq.0) goto 998 ! norder=0
|
||||
if(ndeep.gt.5) ndeep=5
|
||||
if( ndeep.eq. 1) then
|
||||
nord=1
|
||||
npre1=0
|
||||
npre2=0
|
||||
nt=120
|
||||
ntheta=12
|
||||
elseif(ndeep.eq.2) then
|
||||
nord=1
|
||||
npre1=1
|
||||
npre2=0
|
||||
nt=120
|
||||
ntheta=12
|
||||
elseif(ndeep.eq.3) then
|
||||
nord=1
|
||||
npre1=1
|
||||
npre2=1
|
||||
nt=120
|
||||
ntheta=12
|
||||
ntau=15
|
||||
elseif(ndeep.eq.4) then
|
||||
nord=2
|
||||
npre1=1
|
||||
npre2=0
|
||||
nt=120
|
||||
ntheta=12
|
||||
ntau=15
|
||||
elseif(ndeep.eq.5) then
|
||||
nord=3
|
||||
npre1=1
|
||||
npre2=1
|
||||
nt=80
|
||||
ntheta=22
|
||||
ntau=16
|
||||
endif
|
||||
|
||||
do iorder=1,nord
|
||||
misub(1:K-iorder)=0
|
||||
misub(K-iorder+1:K)=1
|
||||
iflag=K-iorder+1
|
||||
do while(iflag .ge.0)
|
||||
if(iorder.eq.nord .and. npre1.eq.0) then
|
||||
iend=iflag
|
||||
else
|
||||
iend=1
|
||||
endif
|
||||
do n1=iflag,iend,-1
|
||||
mi=misub
|
||||
mi(n1)=1
|
||||
if(any(iand(apmaskr(1:K),mi).eq.1)) cycle
|
||||
ntotal=ntotal+1
|
||||
me=ieor(m0,mi)
|
||||
if(n1.eq.iflag) then
|
||||
call mrbencode(me,ce,g2,N,K)
|
||||
e2sub=ieor(ce(K+1:N),hdec(K+1:N))
|
||||
e2=e2sub
|
||||
nd1Kpt=sum(e2sub(1:nt))+1
|
||||
d1=sum(ieor(me(1:K),hdec(1:K))*absrx(1:K))
|
||||
else
|
||||
e2=ieor(e2sub,g2(K+1:N,n1))
|
||||
nd1Kpt=sum(e2(1:nt))+2
|
||||
endif
|
||||
if(nd1Kpt .le. ntheta) then
|
||||
call mrbencode(me,ce,g2,N,K)
|
||||
nxor=ieor(ce,hdec)
|
||||
if(n1.eq.iflag) then
|
||||
dd=d1+sum(e2sub*absrx(K+1:N))
|
||||
else
|
||||
dd=d1+ieor(ce(n1),hdec(n1))*absrx(n1)+sum(e2*absrx(K+1:N))
|
||||
endif
|
||||
if( dd .lt. dmin ) then
|
||||
dmin=dd
|
||||
cw=ce
|
||||
nhardmin=sum(nxor)
|
||||
nd1Kptbest=nd1Kpt
|
||||
endif
|
||||
else
|
||||
nrejected=nrejected+1
|
||||
endif
|
||||
enddo
|
||||
! Get the next test error pattern, iflag will go negative
|
||||
! when the last pattern with weight iorder has been generated.
|
||||
call nextpat(misub,k,iorder,iflag)
|
||||
enddo
|
||||
enddo
|
||||
|
||||
if(npre2.eq.1) then
|
||||
reset=.true.
|
||||
ntotal=0
|
||||
do i1=K,1,-1
|
||||
do i2=i1-1,1,-1
|
||||
ntotal=ntotal+1
|
||||
mi(1:ntau)=ieor(g2(K+1:K+ntau,i1),g2(K+1:K+ntau,i2))
|
||||
call boxit(reset,mi(1:ntau),ntau,ntotal,i1,i2)
|
||||
enddo
|
||||
enddo
|
||||
|
||||
ncount2=0
|
||||
ntotal2=0
|
||||
reset=.true.
|
||||
! Now run through again and do the second pre-processing rule
|
||||
misub(1:K-nord)=0
|
||||
misub(K-nord+1:K)=1
|
||||
iflag=K-nord+1
|
||||
do while(iflag .ge.0)
|
||||
me=ieor(m0,misub)
|
||||
call mrbencode(me,ce,g2,N,K)
|
||||
e2sub=ieor(ce(K+1:N),hdec(K+1:N))
|
||||
do i2=0,ntau
|
||||
ntotal2=ntotal2+1
|
||||
ui=0
|
||||
if(i2.gt.0) ui(i2)=1
|
||||
r2pat=ieor(e2sub,ui)
|
||||
778 continue
|
||||
call fetchit(reset,r2pat(1:ntau),ntau,in1,in2)
|
||||
if(in1.gt.0.and.in2.gt.0) then
|
||||
ncount2=ncount2+1
|
||||
mi=misub
|
||||
mi(in1)=1
|
||||
mi(in2)=1
|
||||
if(sum(mi).lt.nord+npre1+npre2.or.any(iand(apmaskr(1:K),mi).eq.1)) cycle
|
||||
me=ieor(m0,mi)
|
||||
call mrbencode(me,ce,g2,N,K)
|
||||
nxor=ieor(ce,hdec)
|
||||
dd=sum(nxor*absrx)
|
||||
if( dd .lt. dmin ) then
|
||||
dmin=dd
|
||||
cw=ce
|
||||
nhardmin=sum(nxor)
|
||||
endif
|
||||
goto 778
|
||||
endif
|
||||
enddo
|
||||
call nextpat(misub,K,nord,iflag)
|
||||
enddo
|
||||
endif
|
||||
|
||||
998 continue
|
||||
! Re-order the codeword to place message bits at the end.
|
||||
cw(indices)=cw
|
||||
hdec(indices)=hdec
|
||||
decoded=0
|
||||
return
|
||||
end subroutine osdwspr
|
||||
|
||||
subroutine mrbencode(me,codeword,g2,N,K)
|
||||
integer*1 me(K),codeword(N),g2(N,K)
|
||||
! fast encoding for low-weight test patterns
|
||||
codeword=0
|
||||
do i=1,K
|
||||
if( me(i) .eq. 1 ) then
|
||||
codeword=ieor(codeword,g2(1:N,i))
|
||||
endif
|
||||
enddo
|
||||
return
|
||||
end subroutine mrbencode
|
||||
|
||||
subroutine nextpat(mi,k,iorder,iflag)
|
||||
integer*1 mi(k),ms(k)
|
||||
! generate the next test error pattern
|
||||
ind=-1
|
||||
do i=1,k-1
|
||||
if( mi(i).eq.0 .and. mi(i+1).eq.1) ind=i
|
||||
enddo
|
||||
if( ind .lt. 0 ) then ! no more patterns of this order
|
||||
iflag=ind
|
||||
return
|
||||
endif
|
||||
ms=0
|
||||
ms(1:ind-1)=mi(1:ind-1)
|
||||
ms(ind)=1
|
||||
ms(ind+1)=0
|
||||
if( ind+1 .lt. k ) then
|
||||
nz=iorder-sum(ms)
|
||||
ms(k-nz+1:k)=1
|
||||
endif
|
||||
mi=ms
|
||||
do i=1,k ! iflag will point to the lowest-index 1 in mi
|
||||
if(mi(i).eq.1) then
|
||||
iflag=i
|
||||
exit
|
||||
endif
|
||||
enddo
|
||||
return
|
||||
end subroutine nextpat
|
||||
|
||||
subroutine boxit(reset,e2,ntau,npindex,i1,i2)
|
||||
integer*1 e2(1:ntau)
|
||||
integer indexes(4000,2),fp(0:525000),np(4000)
|
||||
logical reset
|
||||
common/boxes/indexes,fp,np
|
||||
|
||||
if(reset) then
|
||||
patterns=-1
|
||||
fp=-1
|
||||
np=-1
|
||||
sc=-1
|
||||
indexes=-1
|
||||
reset=.false.
|
||||
endif
|
||||
|
||||
indexes(npindex,1)=i1
|
||||
indexes(npindex,2)=i2
|
||||
ipat=0
|
||||
do i=1,ntau
|
||||
if(e2(i).eq.1) then
|
||||
ipat=ipat+ishft(1,ntau-i)
|
||||
endif
|
||||
enddo
|
||||
|
||||
ip=fp(ipat) ! see what's currently stored in fp(ipat)
|
||||
if(ip.eq.-1) then
|
||||
fp(ipat)=npindex
|
||||
else
|
||||
do while (np(ip).ne.-1)
|
||||
ip=np(ip)
|
||||
enddo
|
||||
np(ip)=npindex
|
||||
endif
|
||||
return
|
||||
end subroutine boxit
|
||||
|
||||
subroutine fetchit(reset,e2,ntau,i1,i2)
|
||||
integer indexes(4000,2),fp(0:525000),np(4000)
|
||||
integer lastpat
|
||||
integer*1 e2(ntau)
|
||||
logical reset
|
||||
common/boxes/indexes,fp,np
|
||||
save lastpat,inext
|
||||
|
||||
if(reset) then
|
||||
lastpat=-1
|
||||
reset=.false.
|
||||
endif
|
||||
|
||||
ipat=0
|
||||
do i=1,ntau
|
||||
if(e2(i).eq.1) then
|
||||
ipat=ipat+ishft(1,ntau-i)
|
||||
endif
|
||||
enddo
|
||||
index=fp(ipat)
|
||||
|
||||
if(lastpat.ne.ipat .and. index.gt.0) then ! return first set of indices
|
||||
i1=indexes(index,1)
|
||||
i2=indexes(index,2)
|
||||
inext=np(index)
|
||||
elseif(lastpat.eq.ipat .and. inext.gt.0) then
|
||||
i1=indexes(inext,1)
|
||||
i2=indexes(inext,2)
|
||||
inext=np(inext)
|
||||
else
|
||||
i1=-1
|
||||
i2=-1
|
||||
inext=-1
|
||||
endif
|
||||
lastpat=ipat
|
||||
return
|
||||
end subroutine fetchit
|
||||
|
194
lib/fsk4hf/tccsim.f90
Normal file
194
lib/fsk4hf/tccsim.f90
Normal file
@ -0,0 +1,194 @@
|
||||
!
|
||||
! Simulator for terminated convolutional codes (so, far, only rate 1/2)
|
||||
! BPSK on AWGN Channel
|
||||
!
|
||||
! Hybrid decoder - Fano Sequential Decoder and Ordered Statistics Decoder (OSD)a
|
||||
!
|
||||
program tccsim
|
||||
|
||||
parameter (N=162,K=50)
|
||||
integer*1 gen(K,N)
|
||||
integer*1 gg(64)
|
||||
integer*1 mbits(50),mbits2(50)
|
||||
integer*4 mettab(-128:127,0:1)
|
||||
|
||||
parameter (NSYM=162)
|
||||
parameter (MAXSYM=220)
|
||||
character*12 arg
|
||||
character*22 msg,msg2
|
||||
integer*1 data0(11)
|
||||
integer*1 data1(11)
|
||||
integer*1 dat(162)
|
||||
integer*1 softsym(162)
|
||||
integer*1 apmask(162),cw(162)
|
||||
real*4 xx0(0:255)
|
||||
real ss(162)
|
||||
|
||||
character*64 g ! Interleaved polynomial coefficients
|
||||
data g/'1101010010001100101001011101100001000000100111100010010010111111'/
|
||||
|
||||
data xx0/ & !Metric table
|
||||
1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, &
|
||||
1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, &
|
||||
1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, &
|
||||
1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, &
|
||||
1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, &
|
||||
1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, &
|
||||
0.988, 1.000, 0.991, 0.993, 1.000, 0.995, 1.000, 0.991, &
|
||||
1.000, 0.991, 0.992, 0.991, 0.990, 0.990, 0.992, 0.996, &
|
||||
0.990, 0.994, 0.993, 0.991, 0.992, 0.989, 0.991, 0.987, &
|
||||
0.985, 0.989, 0.984, 0.983, 0.979, 0.977, 0.971, 0.975, &
|
||||
0.974, 0.970, 0.970, 0.970, 0.967, 0.962, 0.960, 0.957, &
|
||||
0.956, 0.953, 0.942, 0.946, 0.937, 0.933, 0.929, 0.920, &
|
||||
0.917, 0.911, 0.903, 0.895, 0.884, 0.877, 0.869, 0.858, &
|
||||
0.846, 0.834, 0.821, 0.806, 0.790, 0.775, 0.755, 0.737, &
|
||||
0.713, 0.691, 0.667, 0.640, 0.612, 0.581, 0.548, 0.510, &
|
||||
0.472, 0.425, 0.378, 0.328, 0.274, 0.212, 0.146, 0.075, &
|
||||
0.000,-0.079,-0.163,-0.249,-0.338,-0.425,-0.514,-0.606, &
|
||||
-0.706,-0.796,-0.895,-0.987,-1.084,-1.181,-1.280,-1.376, &
|
||||
-1.473,-1.587,-1.678,-1.790,-1.882,-1.992,-2.096,-2.201, &
|
||||
-2.301,-2.411,-2.531,-2.608,-2.690,-2.829,-2.939,-3.058, &
|
||||
-3.164,-3.212,-3.377,-3.463,-3.550,-3.768,-3.677,-3.975, &
|
||||
-4.062,-4.098,-4.186,-4.261,-4.472,-4.621,-4.623,-4.608, &
|
||||
-4.822,-4.870,-4.652,-4.954,-5.108,-5.377,-5.544,-5.995, &
|
||||
-5.632,-5.826,-6.304,-6.002,-6.559,-6.369,-6.658,-7.016, &
|
||||
-6.184,-7.332,-6.534,-6.152,-6.113,-6.288,-6.426,-6.313, &
|
||||
-9.966,-6.371,-9.966,-7.055,-9.966,-6.629,-6.313,-9.966, &
|
||||
-5.858,-9.966,-9.966,-9.966,-9.966,-9.966,-9.966,-9.966, &
|
||||
-9.966,-9.966,-9.966,-9.966,-9.966,-9.966,-9.966,-9.966, &
|
||||
-9.966,-9.966,-9.966,-9.966,-9.966,-9.966,-9.966,-9.966, &
|
||||
-9.966,-9.966,-9.966,-9.966,-9.966,-9.966,-9.966,-9.966, &
|
||||
-9.966,-9.966,-9.966,-9.966,-9.966,-9.966,-9.966,-9.966, &
|
||||
-9.966,-9.966,-9.966,-9.966,-9.966,-9.966,-9.966,-9.966/
|
||||
|
||||
bias=0.42
|
||||
scale=120
|
||||
! ndelta=nint(3.4*scale)
|
||||
ndelta=100
|
||||
ib=150
|
||||
slope=2
|
||||
do i=0,255
|
||||
mettab(i-128,0)=nint(scale*(xx0(i)-bias))
|
||||
if(i.gt.ib) mettab(i-128,0)=mettab(ib-128,0)-slope*(i-ib)
|
||||
if(i.ge.1) mettab(128-i,1)=mettab(i-128,0)
|
||||
enddo
|
||||
mettab(-128,1)=mettab(-127,1)
|
||||
|
||||
! Get command-line argument(s)
|
||||
nargs=iargc()
|
||||
if(nargs.ne.3) then
|
||||
print*,'Usage: tccsim "message" ntrials ndepth'
|
||||
go to 999
|
||||
endif
|
||||
call getarg(1,msg) !Get message from command line
|
||||
write(*,1000) msg
|
||||
1000 format('Message: ',a22)
|
||||
call getarg(2,arg)
|
||||
read(arg,*) ntrials
|
||||
call getarg(3,arg)
|
||||
read(arg,*) ndepth
|
||||
|
||||
nbits=50+31 !User bits=99, constraint length=32
|
||||
nbytes=(nbits+7)/8
|
||||
limit=20000
|
||||
|
||||
data0=0
|
||||
! call wqencode(msg,ntype0,data0) !Source encoding
|
||||
data0(1:7)=1
|
||||
write(*,1002) data0(1:7),data0(1:6),data0(7)/64
|
||||
1002 format(/'Source-encoded message, 50 bits:'/'Hex: ',7z3.2/ &
|
||||
'Binary: ',6b9.8,b3.2)
|
||||
|
||||
! Demonstrates how to create the generator matrix from a string that contains the interleaved
|
||||
! polynomial coefficients
|
||||
gen=0
|
||||
do j=1,64
|
||||
read(g(j:j),"(i1)") gg(j) ! read polynomial coeffs from string
|
||||
enddo
|
||||
do i=1,K
|
||||
gen(i,2*(i-1)+1:2*(i-1)+64)=gg ! fill the generator matrix with cyclic shifts of gg
|
||||
enddo
|
||||
|
||||
! get message bits from data0
|
||||
nbits=0
|
||||
do i=1,7
|
||||
do ib=7,0,-1
|
||||
nbits=nbits+1
|
||||
if(nbits .le. 50) then
|
||||
mbits(nbits)=0
|
||||
if(btest(data0(i),ib)) mbits(nbits)=1
|
||||
endif
|
||||
enddo
|
||||
enddo
|
||||
|
||||
! Encode message bits using the generator matrix, generating a 162-bit codeword.
|
||||
cw=0
|
||||
do i=1,50
|
||||
if(mbits(i).eq.1) cw=mod(cw+gen(i,:),2)
|
||||
enddo
|
||||
|
||||
write(*,*) 'Codeword from generator matrix: '
|
||||
write(*,'(162i1)') cw
|
||||
|
||||
call encode232(data0,nbytes,dat,MAXSYM) !Convolutional encoding
|
||||
write(*,*) 'Codeword from encode232: '
|
||||
write(*,'(162i1)') dat
|
||||
|
||||
! call inter_mept(dat,1) !Interleaving
|
||||
|
||||
! Here, we have channel symbols.
|
||||
|
||||
! call inter_mept(dat,-1) !Remove interleaving
|
||||
|
||||
call init_random_seed()
|
||||
call sgran()
|
||||
|
||||
do isnr=10,-20,-1
|
||||
sigma=1/sqrt(2*(10**((isnr/2.0)/10.0)))
|
||||
ngood=0
|
||||
nbad=0
|
||||
do i=1,ntrials
|
||||
do j=1,162
|
||||
ss(j)=-(2*dat(j)-1)+sigma*gran() !Simulate soft symbols
|
||||
enddo
|
||||
|
||||
rms=sqrt(sum(ss**2))
|
||||
ss=100*ss/rms
|
||||
where(ss>127.0) ss=127.0
|
||||
where(ss<-127.0) ss=-127.0
|
||||
softsym=ss
|
||||
|
||||
! Call the sequential (Fano algorithm) decoder
|
||||
nbits=50+31
|
||||
call fano232(softsym,nbits,mettab,ndelta,limit,data1,ncycles,metric,nerr)
|
||||
iflag=0
|
||||
nhardmin=0
|
||||
dmin=0.0
|
||||
|
||||
! If Fano fails, call OSD
|
||||
if(nerr.ne.0 .and. ndepth.ge.0) then
|
||||
apmask=0
|
||||
cw=0
|
||||
call osdwspr(-ss/127,apmask,ndepth,cw,nhardmin,dmin)
|
||||
|
||||
! OSD produces a codeword, but code is not systematic
|
||||
! Use Fano with hard decisions to retrieve the message from the codeword
|
||||
cw=-(2*cw-1)*64
|
||||
nbits=50+31
|
||||
call fano232(cw,nbits,mettab,ndelta,limit,data1,ncycles,metric,nerr)
|
||||
iflag=1
|
||||
endif
|
||||
|
||||
! call wqdecode(data1,msg2,ntype1)
|
||||
! write(*,*) msg2,iflag,nhardmin,dmin
|
||||
if(nerr.eq.0 .and. any(data1.ne.data0)) nbad=nbad+1
|
||||
if(nerr.eq.0 .and. all(data1.eq.data0)) ngood=ngood+1
|
||||
enddo
|
||||
|
||||
write(*,'(f4.1,i8,i8)') isnr/2.0,ngood,nbad
|
||||
enddo
|
||||
|
||||
999 end program tccsim
|
||||
|
||||
include '../wsprcode/wspr_old_subs.f90'
|
||||
|
Loading…
Reference in New Issue
Block a user