2017-04-19 16:01:10 -04:00
|
|
|
subroutine msksoftsym(zz,aa,bb,id,nterms,ierror,rxdata,nhard0,nhard, &
|
|
|
|
|
nhardsync0,nhardsync)
|
2017-04-19 15:55:11 -04:00
|
|
|
|
|
|
|
|
parameter (KK=84) !Information bits (72 + CRC12)
|
|
|
|
|
parameter (ND=168) !Data symbols: LDPC (168,84), r=1/2
|
|
|
|
|
parameter (NS=65) !Sync symbols (2 x 26 + Barker 13)
|
|
|
|
|
parameter (NR=3) !Ramp up/down
|
|
|
|
|
parameter (NN=NR+NS+ND) !Total symbols (236)
|
|
|
|
|
parameter (NSPS=16) !Samples per MSK symbol (16)
|
|
|
|
|
parameter (N2=2*NSPS) !Samples per OQPSK symbol (32)
|
|
|
|
|
parameter (N13=13*N2) !Samples in central sync vector (416)
|
|
|
|
|
parameter (NZ=NSPS*NN) !Samples in baseband waveform (3760)
|
|
|
|
|
parameter (NFFT1=4*NSPS,NH1=NFFT1/2)
|
|
|
|
|
|
|
|
|
|
complex zz(NS+ND) !Complex symbol values (intermediate)
|
|
|
|
|
complex z,z0
|
|
|
|
|
real rxdata(ND) !Soft symbols
|
|
|
|
|
real aa(20),bb(20) !Fitted polyco's
|
|
|
|
|
integer id(NS+ND) !NRZ values (+/-1) for Sync and Data
|
|
|
|
|
integer ierror(NS+ND)
|
|
|
|
|
|
|
|
|
|
n=0
|
|
|
|
|
ierror=0
|
|
|
|
|
do j=1,117
|
|
|
|
|
xx=j*2.0/117.0 - 1.0
|
|
|
|
|
yii=1.
|
|
|
|
|
yqq=0.
|
|
|
|
|
if(nterms.gt.0) then
|
|
|
|
|
yii=aa(1)
|
|
|
|
|
yqq=bb(1)
|
|
|
|
|
do i=2,nterms
|
|
|
|
|
yii=yii + aa(i)*xx**(i-1)
|
|
|
|
|
yqq=yqq + bb(i)*xx**(i-1)
|
|
|
|
|
enddo
|
|
|
|
|
endif
|
|
|
|
|
z0=cmplx(yii,yqq)
|
|
|
|
|
z=zz(j)*conjg(z0)
|
|
|
|
|
p=real(z)
|
|
|
|
|
if(abs(id(j)).eq.2) then
|
|
|
|
|
if(real(z)*id(j).lt.0) then !Sync bit
|
|
|
|
|
nhardsync=nhardsync+1
|
|
|
|
|
nhardsync0=nhardsync0+1
|
|
|
|
|
ierror(j)=2
|
|
|
|
|
endif
|
|
|
|
|
else
|
|
|
|
|
n=n+1 !Data bit
|
|
|
|
|
rxdata(n)=p
|
|
|
|
|
ierr=0
|
|
|
|
|
if(id(j)*p.lt.0) then
|
|
|
|
|
ierr=1
|
|
|
|
|
ierror(j)=1
|
|
|
|
|
endif
|
|
|
|
|
nhard0=nhard0+ierr
|
|
|
|
|
nhard=nhard+ierr
|
|
|
|
|
endif
|
|
|
|
|
enddo
|
|
|
|
|
|
|
|
|
|
do j=118,233
|
|
|
|
|
xx=(j-116.5)*2.0/117.0 - 1.0
|
|
|
|
|
yii=1.
|
|
|
|
|
yqq=0.
|
|
|
|
|
if(nterms.gt.0) then
|
|
|
|
|
yii=aa(1)
|
|
|
|
|
yqq=bb(1)
|
|
|
|
|
do i=2,nterms
|
|
|
|
|
yii=yii + aa(i)*xx**(i-1)
|
|
|
|
|
yqq=yqq + bb(i)*xx**(i-1)
|
|
|
|
|
enddo
|
|
|
|
|
endif
|
|
|
|
|
z0=cmplx(yii,yqq)
|
|
|
|
|
z=zz(j)*conjg(z0)
|
|
|
|
|
p=aimag(z)
|
|
|
|
|
n=n+1
|
|
|
|
|
rxdata(n)=p
|
|
|
|
|
ierr=0
|
|
|
|
|
if(id(j)*p.lt.0) then
|
|
|
|
|
ierr=1
|
|
|
|
|
ierror(j)=1
|
|
|
|
|
endif
|
|
|
|
|
nhard0=nhard0+ierr
|
|
|
|
|
nhard=nhard+ierr
|
|
|
|
|
enddo
|
|
|
|
|
|
|
|
|
|
return
|
|
|
|
|
end subroutine msksoftsym
|
