In Figure P3.42, H(z) is the system function of a causal LTI system.
(a) Using z-transforms of the signals shown in the figure, obtain an expression for W(z) in the form
where both H1(z) and H2(z) are expressed in terms of H(z).
(b) For the special case H(z) = z −1/(1 − z −1), determine H1(z) and H2(z).
(c) Is the system H(z) stable? Are the systems H1(z) and H2(z) stable?
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