COMSATS

COMSATS Institute of Information Technology Lahore

Assignment 1

Course

Title: Analog Communication Systems

Course

Instructor/s: Syed Ahmed Faran

Semester: 5th

Batch: FA12-BTE Section:

Date: 10th

November, 201

Problem 1:

We need to wirelessly transmit our message signal

i. Sketch spectrum of m(t).

ii. Find and sketch spectrum of DSB

iii. Supress the LSB terms in above spectra to generate USB spectra only.

iv. By looking at the spectra above, write appropriate equation in time domain of a signal that

would have spectra as above.

v. You can use an appropriate filter to generate above USB spectra from DSB

Suppose you generate USB signal by phase shifting method. Write

USB phase shifter when message signal is

vi. Compare equations of part iv

how are they equal?

Problem 2:

COMSATS - Lancaster Dual Degree Programme

COMSATS Institute of Information Technology Lahore

Assignment 1 Semester Fall 2014

Analog Communication Systems Course

Code: EEE352

Programme

Name: BS Electrical Telecommunication

Section: A Total Score: 40

, 2014. Hand-in date: 17th

November

We need to wirelessly transmit our message signal m(t)=cos300t using SSB modulation.

m(t).

Find and sketch spectrum of DSB-SC signal 2m(t)cos1000t.

Supress the LSB terms in above spectra to generate USB spectra only.

the spectra above, write appropriate equation in time domain of a signal that

would have spectra as above.

You can use an appropriate filter to generate above USB spectra from DSB

Suppose you generate USB signal by phase shifting method. Write appropriate equation of a

USB phase shifter when message signal is m(t)=cos300t.

part iv and part v. Both these equations represent a USB signal. Show

COMSATS Institute of Information Technology Lahore

Electrical Telecommunication Engineering (DDP)

November, 2014.

(18 marks)

using SSB modulation.

the spectra above, write appropriate equation in time domain of a signal that

-SC signal.

appropriate equation of a

. Both these equations represent a USB signal. Show

(8 marks)

Problem 3: (6 marks)

Problem 4: (8 marks)

An angle modulated signal with carrier frequency = 2 10 is given by equation:

() = 10cos ( + 0.12000)

i. After angle modulation, what would be maximum frequency that modulated signal could

attain?

ii. Estimate bandwidth of().