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Fast autocorrelation in Verilog


This example works on FinSim 10_0_6 and subsequent versions.

This example shows how to perform a fast autocorrelation on two vectors of type VpFCartesian, which is a complex number in cartesian coordinates, with fields of type real 

module top;
parameter SIZE = 1024;
VpFCartesian t1[2*SIZE -1:0], t2[2*SIZE -1:0], prod[2*SIZE -1:0];
integer j;

initial begin
#1;
   $InitM(t1, ($I1 < SIZE-1) ? 0 : $I1-SIZE+1, 0);
   $PrintM(t1, "%e");
   $InitM(t2, ($I1 < SIZE) ? 0 : 2*SIZE-$I1, 0);
   $PrintM(t2, "%e");
   $VpFft(t1, 0, 2*SIZE-1);
   $VpFft(t2, 0, 2*SIZE-1);
   for (j = 0; j < 2*SIZE; j = j + 1)
     begin
       prod[j] = t1[j] * t2[j];
     end
   $VpIfft(prod, 0, 2*SIZE-1);
   $PrintM(prod, "%e");
end
endmodule

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