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Tweak some decoder parameters for better performance.

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This commit is contained in:
Steve Franke 2019-01-10 10:35:09 -06:00
parent e0658f183f
commit f63f0301eb
1 changed files with 2 additions and 3 deletions
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5
lib/fsk4hf/ft2d.f90
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@ -103,7 +103,7 @@ program ft2d
cd=c2(ib:ib+144*10-1) cd=c2(ib:ib+144*10-1)
s2=sum(cd*conjg(cd))/(10*144) s2=sum(cd*conjg(cd))/(10*144)
cd=cd/sqrt(s2) cd=cd/sqrt(s2)
do nseq=1,7 do nseq=1,4
if( nseq.eq.1 ) then ! noncoherent single-symbol detection if( nseq.eq.1 ) then ! noncoherent single-symbol detection
sbits1=0.0 sbits1=0.0
do ibit=1,144 do ibit=1,144
@ -159,11 +159,10 @@ program ft2d
rx2av=sum(rxdata(1:128)*rxdata(1:128))/128.0 rx2av=sum(rxdata(1:128)*rxdata(1:128))/128.0
rxsig=sqrt(rx2av-rxav*rxav) rxsig=sqrt(rx2av-rxav*rxav)
rxdata=rxdata/rxsig rxdata=rxdata/rxsig
sigma=0.90 sigma=0.80
llr(1:128)=2*rxdata/(sigma*sigma) llr(1:128)=2*rxdata/(sigma*sigma)
apmask=0 apmask=0
max_iterations=40 max_iterations=40
ifer=0
do ibias=0,0 do ibias=0,0
llr2=llr llr2=llr
if(ibias.eq.1) llr2=llr+0.4 if(ibias.eq.1) llr2=llr+0.4