Assignment No. 3
Semester Fall 2012
Data Communication - CS601

 

Total Marks: 20

 

Due Date: 15-01-2013

 

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:

 

  • The assignment is submitted after due date.
  • The submitted assignment does not open or file is corrupt.
  • The assignment is copied (from other student or copied from handouts or internet).

 

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                                                          16-QAM

b)     25000bps                                                         32-QAM

c)      48000bps                                                        64-QAM

 

 

 

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 MHz-km

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:

QAM-64 encodes 6 bits per symbol (2^6=64).
Baud rate = symbol rate = bit rate / bits per symbol
= 72000 bps / 6 bits per symbol = 12000

Modulation         Bits/Baud                 Baud rate    Bit rate

16-QAM                      4                              N                 4N

32-QAM                      5                              N                  5N

64-QAM                      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                                                          16-QAM

b)     25000bps                                                         32-QAM

c)      48000bps                                                        64-QAM

Solutio:

 

A) QAM-16 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) QAM-32 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) QAM-64 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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