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Assignment No. 3 
Total Marks: 20
Due Date: 15012013 

Objective: To understand the Signal Conversion and Guided Media Instructions: Please read the following instructions carefully before solving & submitting assignment: Assignment should be in your own wordings not copied from net, handouts or books. It should be clear that your assignment will not get any credit (marks) if:
For any query about the assignment, contact at cs601@vu.edu.pk
GOOD LUCK 




Q. 1. Calculate the baud rate against given bit rates by following the methods of given modulation techniques against each bit rate. Write all necessary steps, formulas and units. Also write any 2 possible constellation points of given modulation techniques by considering their given configuration changes (amplitude, phase). [ 15 Marks ]
a) 4000 bps 16QAM b) 25000bps 32QAM c) 48000bps 64QAM
Q. 2. You are required to make a comparison between Single Mode and Multi Mode Fiber Optics on the basis of given parameters. [ 5 Marks ]
Note: Detail is not required, just fill the table comparatively.


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Parameters 
Single Mode 
Multimode 
Size 
High 100 teraHertz 
150/300 MHzkm 
Distance 


Light Source 


Attenuation Resistance 
0.35/0.25 db/km

3/1db/km 
Cost 


plz complet this table as much as u knows............
It is expensive in cost
what about Distance?
Bachun ya kasi ajeeb si assignment ha is dafa....
Example:
Modulation Bits/Baud Baud rate Bit rate
16QAM 4 N 4N
32QAM 5 N 5N
64QAM 6 N 6N
kia given bps ko is given table k bit rate par divide kar k ans aey ga???
ap table say pehly wali example dekho,i hope apko clear ho jaey ga
a) 4000 bps 16QAM
b) 25000bps 32QAM
c) 48000bps 64QAM
Solutio:
A) QAM16 encodes 5 bits per symbol (2^4=16).
Baud rate = symbol rate = bit rate / bits per symbol
= 4000 bps / 4 bits per symbol = 1000
B) QAM32 encodes 5 bits per symbol (2^5=32).
Baud rate = symbol rate = bit rate / bits per symbol
= 25000 bps / 5 bits per symbol = 5000
C) QAM64 encodes 6 bits per symbol (2^6=64).
Baud rate = symbol rate = bit rate / bits per symbol
= 48000 bps / 6 bits per symbol = 8000
Theak hal kia hy na ?
In Q# 1 You have to just write the variation values (combination of amplitude and phase) that can be in given techniques.
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