Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
14352 changed files with 3176737 additions and 0 deletions
@@ -0,0 +1,30 @@
+subroutine spec9f(id2,npts,nsps,s1,jz,nq)
+
+! Compute symbol spectra at quarter-symbol steps.
+
+  integer*2 id2(0:npts)
+  real s1(nq,jz)
+  real x(960)
+  complex c(0:480)
+  equivalence (x,c)
+
+  nfft=2*nsps                               !FFTs at twice the symbol length
+  nh=nfft/2
+  do j=1,jz
+     ia=(j-1)*nsps/4
+     ib=ia+nsps-1
+     if(ib.gt.npts) exit
+     x(1:nh)=id2(ia:ib)
+     x(nh+1:)=0.
+     call four2a(x,nfft,1,-1,0)           !r2c
+     k=mod(j-1,340)+1
+     do i=1,NQ
+        s1(i,j)=1.e-10*(real(c(i))**2 + aimag(c(i))**2)
+     enddo
+  enddo
+
+!### Reference spectrum should be applied here (or possibly earlier?) ###
+!### Normalize so that rms (or level?) is 1.0 ?  ###
+
+  return
+end subroutine spec9f