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.

Answer:

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.

Answer:

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.

Answer:

Propagation   Application
Surface Long range Radio, Submarine Communication
Tropospheric AM Radio,
Ionospheric Military communication, Fax, Telephone
Line of sight Satellite communication, Mobile telephone, FM Radio
Space Radar, Satellite communication

 

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