Consider the block diagram of a discrete-time system given in Figure.
(a) Find the difference-equation model of this system.
(b) Find the system transfer function.
(c) Determine the range of the parameter a for which this system is BIBO stable.
(d) Find the impulse response of this system. Is the answer to Part (c) evident from the impulse response? Why?
(e) Let a = 0.5. Find the unit step response for this system.
(f) Let a = 2.0. Find the unit step response for this system.
(g) Check the results of Parts (e) and (f) using MATLAB.
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