Hello,
I am trying to use the green FFT block with number of simultaneous inputs
set to 0. My understanding was that this makes a biplex fft that processes
two independant data streams in parallel, thus the pol0 input should have x0
x1 x2... and pol1 should have y0 y1 y2 and then the pol0 output will just
have frequencies related to pol0. However, when I simulate this, I find that
the two inputs are interacting. If I set one input to a constant, the output
is significantly different than if I connect the two inputs together (in
which case I should get two identical copies at the output.
I did notice in the packetized correlator iBOB design (using pink blocks)
the pfb_fir block preceeding the fft is set to biplex mode, but I had
assumed this didn't change the functionality of the block since a biplex
pfb_fir block should be equivalent two single input pfb_fir blocks.
Can someone more clearly explain the functionality of the FFT block?
Thank you,
Glenn
