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TELE3113 Mid-Term Exam in T1
Week 5: 14th March
Instructions to Candidates
a) The time allowed: 60 minutes
b) Extra time to download, scan & upload: 30 minutes
c) Answer sheets should be uploaded via Midterm Exam
Answer Sheets Submission Link' on the Moodle
Course page
d) Deadline for uploading to Moodle: 10:30 am
e) Write your name and z-ID on this exam paper if you
are using a tablet/i-pad or on each answer sheet if
writing by hand
f) Answer all the questions. Total Marks = 20
g) Marks are as indicated. Questions do NOT have equal
marks.
h) All answers are to be written in the space provided on
this question paper or in blank sheets.
i) Trigonometric Identities, Fourier Transform table, and
Bessel function table are attached.
j) The paper consists of 2 questions, having three subparts
each.
k) This paper contains 22 pages in total, including this
page and six blank pages for doing rough work.
l) This exam contributes 20% to the total course
assessment.
2
Question 1 (10 marks)
a) A message signal () = cos(2π40) +
1
2
cos(2π90) is transmitted using a
double sideband suppressed carrier (DSB-SC) modulation system with a sinusoidal
carrier signal having a frequency of and amplitude of . Sketch the spectrum
() of the transmitted DSB-SC signal () along with its phasor diagram. (3+2
marks)
Additional Space For Answering Q1a (Page 1 of 1)
b) Now consider a message signal () = cos(200π) which is transmitted using
Amplitude Modulation (AM). Find the transmitted power and transmit
bandwidth for this AM modulated signal with underlying carrier amplitude
being = 10 and modulation index set as = 0.6. (2 marks)