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https://github.com/saitohirga/WSJT-X.git
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Some repairs and tweaks to development-related programs in fsk4hf directory.
This commit is contained in:
Steven Franke
parent
e9160f3c2f
commit
cf07d478ac
22
lib/fsk4hf/get_crc14.f90
Normal file
22
lib/fsk4hf/get_crc14.f90
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@ -0,0 +1,22 @@
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subroutine get_crc14(mc,ncrc)
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character c14*14
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integer*1 mc(68),r(15),p(15)
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integer ncrc
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! polynomial for 14-bit CRC 0x6757
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data p/1,1,0,0,1,1,1,0,1,0,1,0,1,1,1/
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! divide by polynomial
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r=mc(1:15)
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do i=0,53
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r(15)=mc(i+15)
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r=mod(r+r(1)*p,2)
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r=cshift(r,1)
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enddo
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write(c14,'(14b1)') r(1:14)
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read(c14,'(b14.14)') ncrc
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! mc(55:68)=r(1:14)
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end subroutine get_crc14
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@ -8,13 +8,15 @@ use packjt
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parameter(NRECENT=10)
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character*12 recent_calls(NRECENT)
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character*8 arg
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character*68 cmsg
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character*14 c14
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integer*1, allocatable :: codeword(:), decoded(:), message(:)
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integer*1, target:: i1Msg8BitBytes(9)
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integer*1, target:: i1Dec8BitBytes(9)
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integer*1 msgbits(68)
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integer*1 apmask(204)
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integer*1 cw(204)
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integer*2 checksum
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integer*2 ncrc14,nrcrc14
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integer colorder(204)
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integer nerrtot(204),nerrdec(204),nmpcbad(68)
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logical checksumok,fsk,bpsk
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@ -36,6 +38,8 @@ data colorder/ &
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170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186, &
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187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203/
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data cmsg/'11111111000000001111111100000000111111110000000011000000000000000000'/
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do i=1,NRECENT
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recent_calls(i)=' '
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enddo
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@ -66,41 +70,17 @@ N=204
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K=68
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rate=real(K)/real(N)
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write(*,*) "rate: ",rate
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write(*,*) "niter= ",max_iterations," s= ",s
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allocate ( codeword(N), decoded(K), message(K) )
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allocate ( rxdata(N), llr(N) )
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! The message should be packed into the first 7 bytes
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i1Msg8BitBytes(1:6)=85
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i1Msg8BitBytes(7)=64
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! The CRC will be put into the last 2 bytes
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i1Msg8BitBytes(8:9)=0
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checksum = crc10 (c_loc (i1Msg8BitBytes), 9)
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! For reference, the next 3 lines show how to check the CRC
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i1Msg8BitBytes(8)=checksum/256
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i1Msg8BitBytes(9)=iand (checksum,255)
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checksumok = crc10_check(c_loc (i1Msg8BitBytes), 9)
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if( checksumok ) write(*,*) 'Good checksum'
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write(*,*) i1Msg8BitBytes(1:9)
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mbit=0
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do i=1, 7
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i1=i1Msg8BitBytes(i)
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do ibit=1,8
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mbit=mbit+1
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msgbits(mbit)=iand(1,ishft(i1,ibit-8))
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enddo
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enddo
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i1=i1Msg8BitBytes(8) ! First 2 bits of crc10 are LSB of this byte
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do ibit=1,2
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msgbits(50+ibit)=iand(1,ishft(i1,ibit-2))
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enddo
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i1=i1Msg8BitBytes(9) ! Now shift in last 8 bits of the CRC
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do ibit=1,8
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msgbits(52+ibit)=iand(1,ishft(i1,ibit-8))
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enddo
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read(cmsg,'(68i1)') msgbits
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call get_crc14(msgbits,ncrcsf)
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write(c14,'(b14.14)') ncrcsf
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read(c14,'(14i1)') msgbits(55:68)
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write(*,*) 'message'
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write(*,'(9(8i1,1x))') msgbits
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@ -112,12 +92,12 @@ write(*,*) i1Msg8BitBytes(1:9)
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write(*,*) 'codeword'
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write(*,'(204i1)') codeword
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write(*,*) "Es/N0 SNR2500 ngood nundetected nbadcrc sigma"
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do idb = 20,-18,-1
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!do idb = -16, -16, -1
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write(*,*) "Eb/N0 SNR2500 ngood nundetected nbadcrc sigma"
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do idb = 10,-10,-1
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!do idb = 2, 2, -1
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db=idb/2.0-1.0
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! sigma=1/sqrt( 2*rate*(10**(db/10.0)) ) ! to make db represent Eb/No
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sigma=1/sqrt( 2*(10**(db/10.0)) ) ! db represents Es/No
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sigma=1/sqrt( 2*rate*(10**(db/10.0)) ) ! to make db represent Eb/No
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! sigma=1/sqrt( 2*(10**(db/10.0)) ) ! db represents Es/No
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ngood=0
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nue=0
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nbadcrc=0
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@ -147,7 +127,6 @@ do idb = 20,-18,-1
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if(nerr.ge.1) nerrtot(nerr)=nerrtot(nerr)+1
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nberr=nberr+nerr
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! Correct signal normalization is important for this decoder.
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rxav=sum(rxdata)/N
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rx2av=sum(rxdata*rxdata)/N
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rxsig=sqrt(rx2av-rxav*rxav)
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@ -166,58 +145,35 @@ do idb = 20,-18,-1
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apmask=0
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! max_iterations is max number of belief propagation iterations
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call bpdecode204(llr,apmask,max_iterations,decoded,cw,nharderror,niterations)
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if(nharderror.lt.0) niterations=-1
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if( (nharderror .lt. 0) .and. (ndeep .ge. 0) ) then
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call osd204(llr, apmask, ndeep, decoded, cw, nhardmin, dmin)
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niterations=nhardmin
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endif
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n2err=0
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do i=1,N
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if( cw(i)*(2*codeword(i)-1.0) .lt. 0 ) n2err=n2err+1
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enddo
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!write(*,*) nerr,niterations,n2err
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damp=0.75
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ndither=0
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if( niterations .lt. 0 ) then
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do i=1, ndither
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do in=1,N
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dllr(in)=damp*gran()
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enddo
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llrd=llr+dllr
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call bpdecode300(llrd, apmask, max_iterations, decoded, cw, nharderror, niterations)
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if( niterations .ge. 0 ) exit
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enddo
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endif
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! If the decoder finds a valid codeword, niterations will be .ge. 0.
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if( niterations .ge. 0 ) then
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! Check the CRC
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do ibyte=1,6
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itmp=0
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do ibit=1,8
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itmp=ishft(itmp,1)+iand(1,decoded((ibyte-1)*8+ibit))
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enddo
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i1Dec8BitBytes(ibyte)=itmp
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enddo
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i1Dec8BitBytes(7)=decoded(49)*128+decoded(50)*64
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! Need to pack the received crc into bytes 8 and 9 for crc10_check
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i1Dec8BitBytes(8)=decoded(51)*2+decoded(52)
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i1Dec8BitBytes(9)=decoded(53)*128+decoded(54)*64+decoded(55)*32+decoded(56)*16
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i1Dec8BitBytes(9)=i1Dec8BitBytes(9)+decoded(57)*8+decoded(58)*4+decoded(59)*2+decoded(60)*1
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call get_crc14(decoded,ncheck)
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ncrcflag=0
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if( crc10_check( c_loc( i1Dec8BitBytes ), 9 ) ) ncrcflag=1
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if(ncheck.eq.0) ncrcflag=1
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if( ncrcflag .ne. 1 ) then
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nbadcrc=nbadcrc+1
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endif
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nueflag=0
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nueflag=0
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nerrmpc=0
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do i=1,K ! find number of errors in message+crc part of codeword
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if( msgbits(i) .ne. decoded(i) ) then
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nueflag=1
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if(ncrcflag.eq.1) nueflag=1
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nerrmpc=nerrmpc+1
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endif
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enddo
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if(nerrmpc.ge.1) nmpcbad(nerrmpc)=nmpcbad(nerrmpc)+1 ! This histogram should inform our selection of CRC poly
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if( ncrcflag .eq. 1 .and. nueflag .eq. 0 ) then
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ngood=ngood+1
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@ -117,12 +117,12 @@ write(*,*) i1Msg8BitBytes(1:9)
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write(*,*) 'codeword'
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write(*,'(38(8i1,1x))') codeword
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write(*,*) "Es/N0 SNR2500 ngood nundetected nbadcrc sigma"
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write(*,*) "Eb/N0 SNR2500 ngood nundetected nbadcrc sigma"
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do idb = 20,-16,-1
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!do idb = -16, -16, -1
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db=idb/2.0-1.0
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! sigma=1/sqrt( 2*rate*(10**(db/10.0)) ) ! to make db represent Eb/No
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sigma=1/sqrt( 2*(10**(db/10.0)) ) ! db represents Es/No
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sigma=1/sqrt( 2*rate*(10**(db/10.0)) ) ! to make db represent Eb/No
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! sigma=1/sqrt( 2*(10**(db/10.0)) ) ! db represents Es/No
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ngood=0
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nue=0
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nbadcrc=0
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@ -102,7 +102,7 @@ ntotal=0
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nrejected=0
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if(ndeep.eq.0) goto 998 ! norder=0
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if(ndeep.gt.5) ndeep=5
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if(ndeep.gt.6) ndeep=6
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if( ndeep.eq. 1) then
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nord=1
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npre1=0
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@ -136,6 +136,13 @@ elseif(ndeep.eq.5) then
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nt=40
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ntheta=12
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ntau=19
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elseif(ndeep.eq.6) then
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nord=3
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npre1=1
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npre2=1
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nt=60
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ntheta=22
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ntau=16
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endif
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do iorder=1,nord
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