mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-08 01:56:10 -05:00
529ad6eec9
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6805 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
121 lines
3.5 KiB
Fortran
121 lines
3.5 KiB
Fortran
program QRA65code
|
|
|
|
! Provides examples of message packing, bit and symbol ordering,
|
|
! QRA (63,12) encoding, and other necessary details of the QRA65
|
|
! protocol. Also permits simple simulations to measure performance
|
|
! on an AWGN channel with secure time and frequency synchronization.
|
|
|
|
! Return codes from qra65_dec:
|
|
! irc=0 [? ? ?] AP0 (decoding with no a-priori information)
|
|
! irc=1 [CQ ? ?] AP27
|
|
! irc=2 [CQ ? ] AP42
|
|
! irc=3 [CALL ? ?] AP29
|
|
! irc=4 [CALL ? ] AP44
|
|
! irc=5 [CALL CALL ?] AP57
|
|
|
|
use packjt
|
|
character*22 msg,msg0,msg1,decoded,cok*3,bad*1,msgtype*10,arg*12
|
|
integer dgen(12),sent(63),dec(12)
|
|
real s3(0:63,1:63)
|
|
include 'testmsg.f90'
|
|
|
|
nargs=iargc()
|
|
if(nargs.lt.1) then
|
|
print*,'Usage: qra65code "message" [snr2500] [Nrpt]'
|
|
print*,' qra65code -t [snr2500]'
|
|
go to 999
|
|
endif
|
|
|
|
call getarg(1,msg) !Get message from command line
|
|
snr2500=10.0
|
|
if(nargs.ge.2) then
|
|
call getarg(2,arg)
|
|
read(arg,*) snr2500
|
|
endif
|
|
sig=sqrt(2.0)*10.0**(0.05*(snr2500+29.7))
|
|
nmsg=1
|
|
nrpt=1
|
|
if(msg(1:2).eq."-t") then
|
|
nmsg=NTEST
|
|
else
|
|
if(nargs.ge.3) then
|
|
call getarg(3,arg)
|
|
read(arg,*) nrpt
|
|
endif
|
|
endif
|
|
|
|
write(*,1010)
|
|
1010 format(" Message Decoded Err? Type rc"/77("-"))
|
|
|
|
ngood=0
|
|
nbad=0
|
|
do nn=1,nrpt
|
|
do imsg=1,nmsg
|
|
if(nmsg.gt.1) msg=testmsg(imsg)
|
|
call fmtmsg(msg,iz) !To upper, collapse mult blanks
|
|
msg0=msg !Input message
|
|
call chkmsg(msg,cok,nspecial,flip) !See if it includes "OOO" report
|
|
msg1=msg !Message without "OOO"
|
|
call packmsg(msg1,dgen,itype) !Pack message into 12 six-bit bytes
|
|
msgtype=""
|
|
if(itype.eq.1) msgtype="Std Msg"
|
|
if(itype.eq.2) msgtype="Type 1 pfx"
|
|
if(itype.eq.3) msgtype="Type 1 sfx"
|
|
if(itype.eq.4) msgtype="Type 2 pfx"
|
|
if(itype.eq.5) msgtype="Type 2 sfx"
|
|
if(itype.eq.6) msgtype="Free text"
|
|
|
|
call qra65_enc(dgen,sent) !Encode using QRA65
|
|
|
|
! Generate a simulated s3() array with moderately high S/N
|
|
do j=1,63
|
|
do i=0,63
|
|
x=gran()
|
|
y=gran()
|
|
s3(i,j)=x*x + y*y
|
|
enddo
|
|
k=sent(j)
|
|
x=gran() + sig
|
|
y=gran()
|
|
s3(k,j)=x*x + y*y
|
|
enddo
|
|
|
|
call qra65_dec(s3,dec,irc) !Decode
|
|
decoded=" "
|
|
if(irc.ge.0) then
|
|
call unpackmsg(dec,decoded) !Unpack the user message
|
|
call fmtmsg(decoded,iz)
|
|
else
|
|
dec=0
|
|
endif
|
|
|
|
if(decoded.eq.msg0) then
|
|
ngood=ngood+1
|
|
else
|
|
if(irc.ge.0) nbad=nbad+1
|
|
endif
|
|
ii=imsg
|
|
if(nrpt.gt.1) ii=nn
|
|
write(*,1020) ii,msg0,decoded,itype,msgtype,irc
|
|
1020 format(i4,1x,a22,2x,a22,4x,i3,": ",a13,i3)
|
|
enddo
|
|
|
|
if(nmsg.eq.1 .and.nrpt.eq.1) then
|
|
write(*,1030) dgen
|
|
1030 format(/'Packed message, 6-bit symbols ',12i3) !Display packed symbols
|
|
|
|
write(*,1040) sent
|
|
1040 format(/'Information-carrying channel symbols'/(i5,20i3))
|
|
|
|
write(*,1050) dec
|
|
1050 format(/'Received message, 6-bit symbols ',12i3) !Display packed symbols
|
|
endif
|
|
enddo
|
|
|
|
if(nrpt.gt.1) then
|
|
write(*,1060) ngood,nrpt,nbad
|
|
1060 format('Decoded messages:',i5,'/',i4,' Undetected errors:',i5)
|
|
endif
|
|
|
|
999 end program QRA65code
|