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(Computer Communications)

Description

Question 1: [Marks 2]

Assume that a voice channel occupies a bandwidth of 5 kHz. We need to combine four voice channels into a link with a bandwidth of 20 kHz, from 10 to 30 kHz. Draw a complete the diagram to demonstrate the configuration, using the frequency domain. Assume there are no guard bands.

Question 2: [Marks 2]

Five channels, each with a 200-kHz bandwidth, are to be multiplexed together. What is the minimum bandwidth of the link if there is a need for a guard band of 5 kHz between the channels to prevent interference? Draw a complete the diagram to demonstrate the configuration, using the frequency domain.

Question 3: [Marks 2]

The Advanced Mobile Phone System (AMPS) uses two bands. The first band of 824 to 849 MHz is used for sending, and 869 to 894 MHz is used for receiving. Each user has a bandwidth of 30 kHz in each direction. How many people can use their cellular phones simultaneously?

Question 4: [Marks 1]

Find the wavelength of a wave traveling at 50 m/s at a frequency of 5Hz?

Question 5: [Marks 1]

Consider a voice channel being used, via modem, to transmit digital data. Assume a bandwidth of 5000 Hz and the signal levels is 8.

Question 6: [Marks 1]

Consider an example that relates the Nyquist and Shannon formulations. Suppose that the spectrum of a channel is between 3 MHz and 4 MHz and SNRdb = 24db.

Question 7: [Marks 1]

Consider Shannon Capacity Formula (C = B log2(1+SNR), now suppose a telephone line normally has a bandwidth of 3000 Hz assigned for data communication. The SNR is usually 3162. What will be the capacity for this channel?

‫كل ـ ـية الجبي ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـل الصناعـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ــية‬
Jubail Industrial College
‫وكالة شؤون التعليم والتدريب‬
Education and Training Affairs Deputyship

CS 415 (Computer Communications)
Assignment-1
Student ID. -____________________

Question 1:

[ Marks 10]
Student Name: _____________________

[Marks 2]

Assume that a voice channel occupies a bandwidth of 5 kHz. We need to combine four voice
channels into a link with a bandwidth of 20 kHz, from 10 to 30 kHz. Draw a complete the
diagram to demonstrate the configuration, using the frequency domain. Assume there are no
guard bands.

Question 2:

[Marks 2]

Five channels, each with a 200-kHz bandwidth, are to be multiplexed together. What is the
minimum bandwidth of the link if there is a need for a guard band of 5 kHz between the
channels to prevent interference? Draw a complete the diagram to demonstrate the
configuration, using the frequency domain.

‫كل ـ ـية الجبي ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـل الصناعـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ـ ــية‬
Jubail Industrial College
‫وكالة شؤون التعليم والتدريب‬
Education and Training Affairs Deputyship

Question 3:

[Marks 2]

The Advanced Mobile Phone System (AMPS) uses two bands. The first band of 824 to 849
MHz is used for sending, and 869 to 894 MHz is used for receiving. Each user has a
bandwidth of 30 kHz in each direction. How many people can use their cellular phones
simultaneously?

Question 4:

[Marks 1]

Find the wavelength of a wave traveling at 50 m/s at a frequency of 5Hz?

Question 5:

[Marks 1]

Consider a voice channel being used, via modem, to transmit digital data. Assume a bandwidth
of 5000 Hz and the signal levels is 8.

Question 6:

[Marks 1]

Consider an example that relates the Nyquist and Shannon formulations. Suppose that the
spectrum of a channel is between 3 MHz and 4 MHz and SNRdb = 24db.

Question 7:

[Marks 1]

Consider Shannon Capacity Formula (C = B log2(1+SNR), now suppose a telephone line
normally has a bandwidth of 3000 Hz assigned for data communication. The SNR is usually
3162. What will be the capacity for this channel?

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