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More work on a simulator for dpsk with root-raised-cosine pulses.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8632 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke 2018-04-22 19:51:31 +00:00
parent 6445485399
commit bd0d414365
2 changed files with 11 additions and 15 deletions
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12
lib/fsk4hf/genwsprdpsk.f90
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@ -14,7 +14,7 @@ subroutine genwsprdpsk(msg,msgsent,imessage)
logical first
integer ipreamble(16) !Freq estimation preamble
integer isync(32) !Long sync vector
integer imessage(NN)
integer imessage(NN)
data ipreamble/1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1/
data first/.true./
data iuniqueword0/z'30C9E8AD'/
@ -47,11 +47,13 @@ write(*,'(50i1,1x,14i1,1x,4i1)') msgbits
call encode204(msgbits,codeword) !Encode the test message
! Message structure:
! d100 p16 d100
imessage(1:100)=codeword(1:100)
imessage(101:132)=isync
imessage(1)=1 !reference bit
imessage(2:101)=codeword(1:100)
imessage(102:132)=isync(1:31) !only use 31 of the sync bits
imessage(133:232)=codeword(101:200)
do i=2,232
imessage(i)=mod(imessage(i-1)+imessage(i),2)
enddo
return
end subroutine genwsprdpsk

14
lib/fsk4hf/wsprdpsksim.f90
View File

@ -15,7 +15,6 @@ program wsprdpsksim
complex cwav(0:NMAX-1)
real*8 fMHz
integer imessage(NN)
integer idemess(NN) !Differentially encoded message
integer*2 iwave(NMAX) !Generated full-length waveform
! Get command-line argument(s)
@ -54,17 +53,12 @@ program wsprdpsksim
txt=NN*NSPS0/12000.0
call genwsprdpsk(msg,msgsent,imessage) !Encode the message, get itone
imessage=2*imessage-1
write(*,1000) f0,xdt,txt,snrdb,fspread,delay,nfiles,msgsent
1000 format('f0:',f9.3,' DT:',f6.2,' txt:',f6.1,' SNR:',f6.1, &
' fspread:',f6.1,' delay:',f6.1,' nfiles:',i3,2x,a22)
! Assume 0'th message bit is 0
imessage=2*imessage-1
idemess(1)=-1*imessage(1)
do i=2,NN
idemess(i)=imessage(i-1)*imessage(i)
enddo
beta=1.0 ! excess bandwidth
if(nwav.eq.0) then
df=fs/(NMAX/NDOWN) !
@ -84,7 +78,7 @@ program wsprdpsksim
istart=xdt/dt
c0=0.0
do i=1,NN
c0(istart+(i-1)*200)=idemess(i)
c0(istart+(i-1)*200)=imessage(i)
enddo
call four2a(c0,NMAX/NDOWN,1,1,1)
c0=c0*conjg(c)
@ -141,7 +135,7 @@ write(*,*) 'sample SNR: ',10*log10(snrtest)+10*log10(0.4/2.5)
istart=xdt/dt
c0wav=0.0
do i=1,NN
c0wav(istart+(i-1)*200*NDOWN)=idemess(i)
c0wav(istart+(i-1)*200*NDOWN)=imessage(i)
enddo
call four2a(c0wav,NMAX,1,1,1)
c0wav=c0wav*conjg(cwav)