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# Assignment No 3 Data communication (CS601) Solution and Discussion Spring 2014 Due Date: July 14, 2014

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Assignment

Question 1: (5 Marks)
When a signal travels from source to destination, it may b affected by different external factors that cause the loss of energy, due to which the signal may differs from its actual shape. In the given table you are required to identify the type of noise with respect to noise source.

Noise Source                                                             Noise Type

Telephone Wire
Water Pump
Earthquake
Extra Signal generated by Motion of Electron
Grinder

Question 2: (5 Marks)
Suppose a signal is generated from a source with initial power of 1000W but due to attenuation it is received at destination (80 Km away from source) with power of 100W. Find the total power loss in decibels by writing formula with all calculation steps.

Question 3: (5 Marks)
Suppose you need to have simultaneous transmission of signals through a single medium, then which technique will be used to fulfill this requirement? Also describe, how does that technique work at sender and receiver end?

NOTE: Do not put any query on MDB about this assignment, if you have any query then email at cs601@vu.edu.pk.

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### Replies to This Discussion

Our main purpose here discussion not just Solution

We are here with you hands in hands to facilitate your learning and do not appreciate the idea of copying or replicating solutions.

 Noise Source Noise Type Telephone Wire crosstalk Water Pump Industrial Noise Earthquake Atmospheric Noise Extra Signal generated by Motion of Electron( Shot Noise Grinder  (type of noise : Extraterrestrial Noise )

Grinder  (type of noise : Extraterrestrial Noise )

Extraterrestrial noise is a type of noise from outside the Earth include solar noise and cosmic noise.

so how can grinder noise is a type of Extraterrestrial noise???

i think grinder noise is a type of Induced noise. am i right????

bcz Induced noise comes from source like motors and appliances.

i think u r ri8  Shining Eyex

grinde noise  is not  a type of Extraterrestrial Noise

yes u r right

yes you are right

r u sure abt grinder?

grinder noise may be fall in this catagory

yes u r right

types of noise :

External Noise:
External noise is defined as the type of Noise which is general externally due to communicationsystem. External Noise are analysed qualitatively. Now, External Noise may be classified as

a) Atmospheric Noise : Atmospheric Noise is also known as static noise which is the natural source of disturbance caused by lightning, discharge in thunderstorm and the natural disturbances occurring in the nature.

b) Industrial Noise : Sources of Industrial noise are auto-mobiles, aircraft, ignition of electric motors and switching gear. The main cause of Industrial noise is High voltage wires. These noises is generally produced by the discharge present in the operations.

c) Extraterrestrial Noise : Extraterrestrial Noise exist on the basis of their originating source. They are subdivided into
i) Solar Noise
ii) Cosmic Noise

Internal Noise:
Internal Noise are the type of Noise which are generated internally or within the Communication System or in the receiver. They may be treated qualitatively and can also be reduced or minimized by the proper designing of the system. Internal Noises are classified as

1) Shot Noise : These Noise are generally arises in the active devices due to the random behaviour of Charge particles or carries. In case of electron tube, shot Noise is produces due to the random emission of electron form cathodes.

2) Partition Noise : When a circuit is to divide in between two or more paths then the noise generated is known as Partition noise. The reason for the generation is random fluctuation in the division.

3) Low- Frequency Noise : They are also known as FLICKER NOISE. These type of noise are generally observed at a frequency range below few kHz. Power spectral density of these noise increases with the decrease in frequency. That why the name is given Low- Frequency Noise.

4) High- Frequency Noise : These noises are also known TRANSIT- TIME Noise. They are observed in the semi-conductor devices when the transit time of a charge carrier while crossing a junction is compared with the time period of that signal.

Tariq bhai ye definitions kahan se li hain ap nay?

no H.O main hain, na suggested book main. to phir kahan se li hain. H.O k mutaabiq to na us main industrial noise ka zikar ha na partition noise ka, aur na Extraterrestrial Noise wagera ka. clear karen is confusion ko please.

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