what is complex filter
Hello,
I expected something like that. I didn't yet know "complex filters" as a common term in signal processing, but that doesn't mean a thing. Polyphase, however, is wellknown and certainly not a synonymous. But no need to discuss term definitions.
The "complex" aspect of the filter is, that it joins two channels, who together represent a complex signal, the wellknown I and Q channels of a receiver. In the receiver, both signals are scalars, and treated as such. In an analog receiver circuit, they are voltages or currents, in a digital one, they are numbers. I don't see any special simulation issue. Complex arithmetics could be needed for the filter design, but not for simulation, I think.
Regards,
Frank