255 lines
7.8 KiB
Fortran
255 lines
7.8 KiB
Fortran
program ldpcsim300
|
|
|
|
! End-to-end test of the (300,60)/crc10 encoder and decoders.
|
|
|
|
use crc
|
|
use packjt
|
|
|
|
parameter(NRECENT=10)
|
|
character*12 recent_calls(NRECENT)
|
|
character*8 arg
|
|
integer*1, allocatable :: codeword(:), decoded(:), message(:)
|
|
integer*1, target:: i1Msg8BitBytes(9)
|
|
integer*1, target:: i1Dec8BitBytes(9)
|
|
integer*1 msgbits(60)
|
|
integer*1 apmask(300)
|
|
integer*1 cw(300)
|
|
integer*2 checksum
|
|
integer colorder(300)
|
|
integer nerrtot(300),nerrdec(300),nmpcbad(60)
|
|
logical checksumok,fsk,bpsk
|
|
real*8, allocatable :: rxdata(:)
|
|
real, allocatable :: llr(:)
|
|
real dllr(300),llrd(300)
|
|
|
|
data colorder/ &
|
|
0,1,2,3,4,5,6,7,8,9,10,11,123,12,13,14,15,16,17,18, &
|
|
19,20,21,22,23,24,25,138,26,145,27,28,29,30,31,32,33,34,35,36, &
|
|
37,154,38,39,40,41,42,43,44,144,46,47,48,49,50,51,52,53,143,54, &
|
|
125,56,57,58,124,59,120,140,157,160,55,60,61,62,156,162,141,64,65,153, &
|
|
181,183,66,170,67,68,69,130,70,164,71,72,73,74,75,63,76,77,135,78, &
|
|
79,80,176,169,82,83,84,167,180,85,136,158,129,166,175,142,134,146,121,165, &
|
|
88,89,192,90,45,91,92,93,182,189,94,95,96,173,81,97,98,178,122,126, &
|
|
132,99,100,152,186,193,101,102,151,103,104,172,159,168,150,190,147,148,201,107, &
|
|
205,177,108,198,197,174,127,109,185,110,202,87,199,171,179,187,139,137,106,131, &
|
|
206,194,112,149,155,113,128,184,196,86,114,203,212,195,208,105,188,161,163,191, &
|
|
200,209,214,204,115,218,133,111,207,117,213,216,211,217,116,215,219,220,210,221, &
|
|
118,222,223,225,224,228,226,229,231,227,233,119,234,235,232,230,237,239,236,238, &
|
|
240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,256,257,258,259, &
|
|
260,261,262,263,264,265,266,267,268,269,270,271,272,273,274,275,276,277,278,279, &
|
|
280,281,282,283,284,285,286,287,288,289,290,291,292,293,294,295,296,297,298,299/
|
|
|
|
do i=1,NRECENT
|
|
recent_calls(i)=' '
|
|
enddo
|
|
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.4) then
|
|
print*,'Usage: ldpcsim niter ndeep #trials s '
|
|
print*,'eg: ldpcsim 100 4 1000 0.84'
|
|
print*,'If s is negative, then value is ignored and sigma is calculated from SNR.'
|
|
return
|
|
endif
|
|
call getarg(1,arg)
|
|
read(arg,*) max_iterations
|
|
call getarg(2,arg)
|
|
read(arg,*) ndeep
|
|
call getarg(3,arg)
|
|
read(arg,*) ntrials
|
|
call getarg(4,arg)
|
|
read(arg,*) s
|
|
|
|
fsk=.false.
|
|
bpsk=.true.
|
|
|
|
! don't count crc bits as data bits
|
|
N=300
|
|
K=60
|
|
! scale Eb/No for a (300,50) code
|
|
rate=real(50)/real(N)
|
|
|
|
write(*,*) "rate: ",rate
|
|
write(*,*) "niter= ",max_iterations," s= ",s
|
|
|
|
allocate ( codeword(N), decoded(K), message(K) )
|
|
allocate ( rxdata(N), llr(N) )
|
|
|
|
! The message should be packed into the first 7 bytes
|
|
i1Msg8BitBytes(1:6)=85
|
|
i1Msg8BitBytes(7)=64
|
|
! The CRC will be put into the last 2 bytes
|
|
i1Msg8BitBytes(8:9)=0
|
|
checksum = crc10 (c_loc (i1Msg8BitBytes), 9)
|
|
! For reference, the next 3 lines show how to check the CRC
|
|
i1Msg8BitBytes(8)=checksum/256
|
|
i1Msg8BitBytes(9)=iand (checksum,255)
|
|
checksumok = crc10_check(c_loc (i1Msg8BitBytes), 9)
|
|
if( checksumok ) write(*,*) 'Good checksum'
|
|
write(*,*) i1Msg8BitBytes(1:9)
|
|
|
|
mbit=0
|
|
do i=1, 7
|
|
i1=i1Msg8BitBytes(i)
|
|
do ibit=1,8
|
|
mbit=mbit+1
|
|
msgbits(mbit)=iand(1,ishft(i1,ibit-8))
|
|
enddo
|
|
enddo
|
|
i1=i1Msg8BitBytes(8) ! First 2 bits of crc10 are LSB of this byte
|
|
do ibit=1,2
|
|
msgbits(50+ibit)=iand(1,ishft(i1,ibit-2))
|
|
enddo
|
|
i1=i1Msg8BitBytes(9) ! Now shift in last 8 bits of the CRC
|
|
do ibit=1,8
|
|
msgbits(52+ibit)=iand(1,ishft(i1,ibit-8))
|
|
enddo
|
|
|
|
write(*,*) 'message'
|
|
write(*,'(9(8i1,1x))') msgbits
|
|
|
|
call encode300(msgbits,codeword)
|
|
call init_random_seed()
|
|
call sgran()
|
|
|
|
write(*,*) 'codeword'
|
|
write(*,'(38(8i1,1x))') codeword
|
|
|
|
write(*,*) "Es/N0 SNR2500 ngood nundetected nbadcrc sigma"
|
|
do idb = 20,-16,-1
|
|
!do idb = -16, -16, -1
|
|
db=idb/2.0-1.0
|
|
! sigma=1/sqrt( 2*rate*(10**(db/10.0)) ) ! to make db represent Eb/No
|
|
sigma=1/sqrt( 2*(10**(db/10.0)) ) ! db represents Es/No
|
|
ngood=0
|
|
nue=0
|
|
nbadcrc=0
|
|
nberr=0
|
|
do itrial=1, ntrials
|
|
! Create a realization of a noisy received word
|
|
do i=1,N
|
|
if( bpsk ) then
|
|
rxdata(i) = 2.0*codeword(i)-1.0 + sigma*gran()
|
|
elseif( fsk ) then
|
|
if( codeword(i) .eq. 1 ) then
|
|
r1=(1.0 + sigma*gran())**2 + (sigma*gran())**2
|
|
r2=(sigma*gran())**2 + (sigma*gran())**2
|
|
elseif( codeword(i) .eq. 0 ) then
|
|
r2=(1.0 + sigma*gran())**2 + (sigma*gran())**2
|
|
r1=(sigma*gran())**2 + (sigma*gran())**2
|
|
endif
|
|
rxdata(i)=0.35*(sqrt(r1)-sqrt(r2))
|
|
! rxdata(i)=0.35*(exp(r1)-exp(r2))
|
|
! rxdata(i)=0.12*(log(r1)-log(r2))
|
|
endif
|
|
enddo
|
|
nerr=0
|
|
do i=1,N
|
|
if( rxdata(i)*(2*codeword(i)-1.0) .lt. 0 ) nerr=nerr+1
|
|
enddo
|
|
if(nerr.ge.1) nerrtot(nerr)=nerrtot(nerr)+1
|
|
nberr=nberr+nerr
|
|
|
|
! Correct signal normalization is important for this decoder.
|
|
rxav=sum(rxdata)/N
|
|
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
|
|
ss=s
|
|
endif
|
|
|
|
llr=2.0*rxdata/(ss*ss)
|
|
apmask=0
|
|
! max_iterations is max number of belief propagation iterations
|
|
call bpdecode300(llr, apmask, max_iterations, decoded, niterations, cw)
|
|
if( (niterations .lt. 0) .and. (ndeep .ge. 0) ) then
|
|
call osd300(llr, apmask, ndeep, decoded, cw, nhardmin, dmin)
|
|
niterations=nhardmin
|
|
endif
|
|
n2err=0
|
|
do i=1,N
|
|
if( cw(i)*(2*codeword(i)-1.0) .lt. 0 ) n2err=n2err+1
|
|
enddo
|
|
!write(*,*) nerr,niterations,n2err
|
|
damp=0.75
|
|
ndither=0
|
|
if( niterations .lt. 0 ) then
|
|
do i=1, ndither
|
|
do in=1,N
|
|
dllr(in)=damp*gran()
|
|
enddo
|
|
llrd=llr+dllr
|
|
call bpdecode300(llrd, apmask, max_iterations, decoded, niterations, cw)
|
|
if( niterations .ge. 0 ) exit
|
|
enddo
|
|
endif
|
|
|
|
! If the decoder finds a valid codeword, niterations will be .ge. 0.
|
|
if( niterations .ge. 0 ) then
|
|
! Check the CRC
|
|
do ibyte=1,6
|
|
itmp=0
|
|
do ibit=1,8
|
|
itmp=ishft(itmp,1)+iand(1,decoded((ibyte-1)*8+ibit))
|
|
enddo
|
|
i1Dec8BitBytes(ibyte)=itmp
|
|
enddo
|
|
i1Dec8BitBytes(7)=decoded(49)*128+decoded(50)*64
|
|
! Need to pack the received crc into bytes 8 and 9 for crc10_check
|
|
i1Dec8BitBytes(8)=decoded(51)*2+decoded(52)
|
|
i1Dec8BitBytes(9)=decoded(53)*128+decoded(54)*64+decoded(55)*32+decoded(56)*16
|
|
i1Dec8BitBytes(9)=i1Dec8BitBytes(9)+decoded(57)*8+decoded(58)*4+decoded(59)*2+decoded(60)*1
|
|
ncrcflag=0
|
|
if( crc10_check( c_loc( i1Dec8BitBytes ), 9 ) ) ncrcflag=1
|
|
|
|
if( ncrcflag .ne. 1 ) then
|
|
nbadcrc=nbadcrc+1
|
|
endif
|
|
nueflag=0
|
|
|
|
nerrmpc=0
|
|
do i=1,K ! find number of errors in message+crc part of codeword
|
|
if( msgbits(i) .ne. decoded(i) ) then
|
|
nueflag=1
|
|
nerrmpc=nerrmpc+1
|
|
endif
|
|
enddo
|
|
if(nerrmpc.ge.1) nmpcbad(nerrmpc)=nmpcbad(nerrmpc)+1 ! This histogram should inform our selection of CRC poly
|
|
if( ncrcflag .eq. 1 .and. nueflag .eq. 0 ) then
|
|
ngood=ngood+1
|
|
if(nerr.ge.1) nerrdec(nerr)=nerrdec(nerr)+1
|
|
else if( ncrcflag .eq. 1 .and. nueflag .eq. 1 ) then
|
|
nue=nue+1;
|
|
endif
|
|
endif
|
|
enddo
|
|
snr2500=db+10*log10(1.389/2500.0)
|
|
pberr=real(nberr)/(real(ntrials*N))
|
|
write(*,"(f4.1,4x,f5.1,1x,i8,1x,i8,1x,i8,8x,f5.2,8x,e10.3)") db,snr2500,ngood,nue,nbadcrc,ss,pberr
|
|
|
|
enddo
|
|
|
|
open(unit=23,file='nerrhisto.dat',status='unknown')
|
|
do i=1,120
|
|
write(23,'(i4,2x,i10,i10,f10.2)') i,nerrdec(i),nerrtot(i),real(nerrdec(i))/real(nerrtot(i)+1e-10)
|
|
enddo
|
|
close(23)
|
|
open(unit=25,file='nmpcbad.dat',status='unknown')
|
|
do i=1,60
|
|
write(25,'(i4,2x,i10)') i,nmpcbad(i)
|
|
enddo
|
|
close(25)
|
|
|
|
|
|
|
|
end program ldpcsim300
|