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ENG201: Linear Systems Analysis and Design Assignment, SUSS, Singapore Determine whether the following signals are periodic. If a signal is periodic, then calculate its fundamental period
University Singapore University of Social Science (SUSS)
Subject ENG201: Linear Systems Analysis and Design
Posted on: 8th Aug 2023

ENG201: Linear Systems Analysis and Design Assignment, SUSS, Singapore Determine whether the following signals are periodic. If a signal is periodic, then calculate its fundamental period

Question 1

(a) Determine whether the following signals are periodic. If a signal is periodic, then calculate its fundamental period.

(b) A linear system, L, has the following relationship,

between its input π‘₯[𝑛] and its output, 𝑦[𝑛], where β„Ž[𝑛] = 𝑒[𝑛] βˆ’ 𝑒[𝑛 βˆ’ 4] and
𝑒[𝑛] is the discrete unit step.

(i) Determine 𝑦[𝑛] when π‘₯[𝑛] = 𝛿[𝑛 βˆ’ 1].

(ii) Determine 𝑦[𝑛] when π‘₯[𝑛] = 𝛿[𝑛 βˆ’ 2].

(iii) Is the system linear time-invariant (LTI)?

(iv) Determine and sketch 𝑦[𝑛] when π‘₯[𝑛] = 𝑒[𝑛].

(c) Which of the following impulse responses corresponds to a stable LTI system? Justify your answer.

Question 2

Consider the following three linear time-invariant (LTI) systems connected as shown in Figure Q2 below:

(a) The impulse response of each block is given by:

Describe the overall system impulse response β„Žπ‘  [𝑛].

(b) Analyse the above system’s frequency response by computing the Discrete
Fourier Transform of its impulse response.

(c) An input signal π‘₯[𝑛] = 2 cos ( 2πœ‹6 𝑛) is fed into the above system. From the
frequency response obtained in Question 2(b), calculate the output signal, 𝑦[𝑛].

(d) Discuss the stability of the above-given system.

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