# CS601 Data Communication Assignment 3 Solution Fall 2013

Assignment

Question 1:   (10 Marks)

a) Assume that a sports channel is using FM (frequency modulation) for broadcasting its transmission. You are required to calculate the bandwidth of broadcasted signal (modulated) in KHz for each of the following signals:

• Modulating signal with a bandwidth of 15 KHz.
• Modulating signal with frequencies of 4000 to 7000 Hz.

Bw(modulated signal) = BW(modulating signal)*10

= 15*10

= 150KHz

BW    =   f2 – f1

BW    =   7000-4000

BW     =  3000Hz

BW     =  3000/1000

BW    =   3KHz

Bw(modulated signal) = BW(modulating signal)*10

= 3*10

= 30KHz

b) Suppose a radio channel is using AM (Amplitude modulation) for broadcasting its transmission. You are required to calculate the bandwidth of broadcasted signal in KHz for each of the following signals:

• Modulating signal with a bandwidth of 6 KHz.
• Modulating signal with frequencies of 3000 to 6000 Hz.

Bw(modulated signal) = BW(modulating signal)*2

= 6*2

= 12KHz

BW    =   f2 – f1

BW    =   6000-3000

BW     =  3000Hz

BW     =  3000/1000

BW    =   3KHz

Bw(modulated signal) = BW(modulating signal)*2

= 3*2

= 6KHz

Question 2:   (5 Marks)

Radio waves transmission utilizes five different types of propagation. You are required to identify at least one application (that uses the particular propagation) for each of the given propagation types.