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Use squared metric for fst4 - works better on fading channel.

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Steven Franke 2020-08-01 10:58:21 -05:00 committed by Bill Somerville
parent 37e05f6074
commit cdbe425e56
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2 changed files with 16 additions and 16 deletions
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2
lib/fst4/get_fst4_bitmetrics.f90
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@ -105,7 +105,7 @@ subroutine get_fst4_bitmetrics(cd,nss,hmod,nmax,nhicoh,bitmetrics,s4,badsync)
csum=csum+cs(graymap(ntone),ks+j)*cterm
cterm=cterm*conjg(cp(graymap(ntone)))
enddo
s2(i)=abs(csum)
s2(i)=abs(csum)**2
enddo
ipt=1+(ks-1)*2
if(nsym.eq.1) ibmax=1

30
lib/fst4/get_fst4_bitmetrics2.f90
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@ -49,21 +49,21 @@ subroutine get_fst4_bitmetrics2(cd,nss,hmod,nsizes,bitmetrics,s4hmod,badsync)
i1=(k-1)*NSS
csymb=cd(i1:i1+NSS-1)
do itone=0,3
s4(itone,k,1)=abs(sum(csymb*conjg(c1(:,itone))))
s4(itone,k,2)=abs(sum(csymb( 1:nss/2)*conjg(c1( 1:nss/2,itone)))) + &
abs(sum(csymb(nss/2+1: nss)*conjg(c1(nss/2+1: nss,itone))))
s4(itone,k,3)=abs(sum(csymb( 1: nss/4)*conjg(c1( 1: nss/4,itone)))) + &
abs(sum(csymb( nss/4+1: nss/2)*conjg(c1( nss/4+1: nss/2,itone)))) + &
abs(sum(csymb( nss/2+1:3*nss/4)*conjg(c1( nss/2+1:3*nss/4,itone)))) + &
abs(sum(csymb(3*nss/4+1: nss)*conjg(c1(3*nss/4+1: nss,itone))))
s4(itone,k,4)=abs(sum(csymb( 1: nss/8)*conjg(c1( 1: nss/8,itone)))) + &
abs(sum(csymb( nss/8+1: nss/4)*conjg(c1( nss/8+1: nss/4,itone)))) + &
abs(sum(csymb( nss/4+1:3*nss/8)*conjg(c1( nss/4+1:3*nss/8,itone)))) + &
abs(sum(csymb(3*nss/8+1: nss/2)*conjg(c1(3*nss/8+1: nss/2,itone)))) + &
abs(sum(csymb( nss/2+1:5*nss/8)*conjg(c1( nss/2+1:5*nss/8,itone)))) + &
abs(sum(csymb(5*nss/8+1:3*nss/4)*conjg(c1(5*nss/8+1:3*nss/4,itone)))) + &
abs(sum(csymb(3*nss/4+1:7*nss/8)*conjg(c1(3*nss/4+1:7*nss/8,itone)))) + &
abs(sum(csymb(7*nss/8+1: nss)*conjg(c1(7*nss/8+1: nss,itone))))
s4(itone,k,1)=abs(sum(csymb*conjg(c1(:,itone))))**2
s4(itone,k,2)=abs(sum(csymb( 1:nss/2)*conjg(c1( 1:nss/2,itone))))**2 + &
abs(sum(csymb(nss/2+1: nss)*conjg(c1(nss/2+1: nss,itone))))**2
s4(itone,k,3)=abs(sum(csymb( 1: nss/4)*conjg(c1( 1: nss/4,itone))))**2 + &
abs(sum(csymb( nss/4+1: nss/2)*conjg(c1( nss/4+1: nss/2,itone))))**2 + &
abs(sum(csymb( nss/2+1:3*nss/4)*conjg(c1( nss/2+1:3*nss/4,itone))))**2 + &
abs(sum(csymb(3*nss/4+1: nss)*conjg(c1(3*nss/4+1: nss,itone))))**2
s4(itone,k,4)=abs(sum(csymb( 1: nss/8)*conjg(c1( 1: nss/8,itone))))**2 + &
abs(sum(csymb( nss/8+1: nss/4)*conjg(c1( nss/8+1: nss/4,itone))))**2 + &
abs(sum(csymb( nss/4+1:3*nss/8)*conjg(c1( nss/4+1:3*nss/8,itone))))**2 + &
abs(sum(csymb(3*nss/8+1: nss/2)*conjg(c1(3*nss/8+1: nss/2,itone))))**2 + &
abs(sum(csymb( nss/2+1:5*nss/8)*conjg(c1( nss/2+1:5*nss/8,itone))))**2 + &
abs(sum(csymb(5*nss/8+1:3*nss/4)*conjg(c1(5*nss/8+1:3*nss/4,itone))))**2 + &
abs(sum(csymb(3*nss/4+1:7*nss/8)*conjg(c1(3*nss/4+1:7*nss/8,itone))))**2 + &
abs(sum(csymb(7*nss/8+1: nss)*conjg(c1(7*nss/8+1: nss,itone))))**2
enddo
enddo