Aliasing cancelation in block filters and periodically time varying systems: a time-domain approach
R. Gandhi, Sushmita Mitra · 2002
A block filter, in general, is a linear, periodic and time-varying (LPTV) system. Under certain conditions satisfied by the transfer function matrix of the filter, the system has an alias free operation, i.e., it behaves like a linear time-invariant (LTI) system. In this paper, we first develop a set of necessary and sufficient conditions for the alias free operation of block filters based on a time-domain analysis of the system. We then develop conditions for the alias free operation of general LPTV systems.