View the step-by-step solution to:

Question




Please help me solve with solutions.



hw2-page-001.jpg

hw2-page-002.jpg

Also we assume that fcT is an integer. Show that the estimated phase o of the system equals the
true one, o.
Product
1(t)
modulator
fa di
cos(27 fet)
Local
r(t) = Ac cos (2n fet - )
oscillator
tan -1 ( 0)
Estimated phase
90 phase
shifter
sin (27 fet)
12
Product
modulator
12 (t
Figure 2: Problem 2.
Problem 3 (33%) Consider the super-heterodyne receiver in Figure 3.
yz(t)
Bandpass
Product
Bandpass
Product
Lowpass
yRF(t)
filter
modulator
filter
modulator
ilter
Local
oscillator
fLo = 1 Hz
Local
oscillator
IF = 0.5 Hz
RF Section
IF Section
Figure 3: Problem 3.
The target is to demodulate a DSB-SC modulated signal at carrier frequency fc = 1.5 Hz and
with message bandwidth W = 0.4 Hz. Figure 4 illustrates the spectrum of the received signal
yRF (t), which has other modulated signals over other frequency bands, and the frequency responses
of the filters in the receiver. Sketch the spectra of yi(t), y2(t), 93(t) and y4(t) in the graph paper
in Figure 5.
2

hw2-page-003.jpg

hw2-page-004.jpg

Recently Asked Questions

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.

  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

    Browse Documents
  • -

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question
Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes