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# Assignment No. 3 Semester: Spring 2015 Data Communication - CS601 Total Marks: 12 Due Date: 27/07/2015

Objective:

To have the understanding of Transmission Impairments

and Performance of Transmission Medium.

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Question No.1:

Consider a noisy channel in which the value of the signal-to-noise ratio is 2500

and the channel capacity according to Shannon Capacity formula is 33840 bps.

Find its bandwidth? Provide your answer with full calculation and correct unit.

 Calculation Bandwidth with proper Unit

Question No. 2:

Suppose a signal travels through a transmission medium and due to some

reasons its power is reduced to quarter. You are required to measures the relative strength of this signal before and after power loss. Provide your answer with full calculation and correct unit.

 Calculation Relative signal strength before and after power loss with unit

Note: Give you solution with all relevant calculations in given tables.

Views: 7219

### Replies to This Discussion

yeh p2 ki -6.02 value kahan se aye jb ka hum formula mai p2 ko put ker chuky hai.

ifza take log10 of 0.25 that will be equal to 0.6 then multiply 0.6 with 10 the answer will be 6

Assignment No: 2 (Lessons 28 – 30)

salam if you  ,ve solution of this assignment please.

Question 1:                                                                                                       Marks: 3+4=7

a)      A box contains 4 red and 5 white flowers. A random sample of 6 flowers is drawn without replacement from the box. Find the probability that the sample contains 3 red flowers.

b)      If X is binomially distributed with mean 8 and variance 4.8, then find the parameters of binomial distribution.

Question 2:                                                                                                          Marks: 3+5=8

a)       Suppose the number of defective screws produced by a machine per day follows Poisson distribution with parameter 2. What is the probability that, out of the total production of the day, there are at least one defective screw?

b)       The  Army  reports  that  the  distribution  of  head  circumferences  among  soldiers is  approximately  normal  with  mean  23.4 inches  and  standard  deviation 1.4 inches. What  percent  of  soldiers  have  a  head  circumference  between  21.0  inches and   24.0  inches?

CS601 ASSIgnment SOlution See attach file

Attachments:

q no 2 sol

 Signal strength before loss =100w =20dB Signal strength after loss = 25w = 13.9794 dB

Loss= 20dB-13.9794dB

=-6.0206 dB

Suppose a signal travels through a transmission medium and due to some reasons its power is reduced to quarter. You are required to measures the relative strength of this signal before and after power loss. Provide your answer with full calculation and correct unit.

dB=10 log10(0.25P1/P1)

=10 (-0.6)

=-6.02

So P2 =-6.02

We know that P2 = 0.25 P1

There for P1=P2/0.25

=-6.02/0.25

=-24

 2

Shannon Capacity Formula

C=B*log2 (1+S/N)

 33840=Blog2(1+2500) 33840=B(11.288)

33840/11.288 Hz = B

2997.87

Question No.1:

Consider a noisy channel in which the value of the signal-to-noise ratio is 2500 and the channel capacity according to Shannon Capacity formula is 33840 bps. Find its bandwidth? Provide your answer with full calculation and correct unit.

• C=B log2(1+S/N)
• B=C/log2(1=S/N)
•  B=33840/log2(2501)
•  B=2997.8207H

Q2

Suppose a signal travels through a transmission medium and due to some reasons its power is reduced to quarter. You are required to measures the relative strength of this signal before and after power loss. Provide your answer with full calculation and correct unit.

dB=10 log10(0.25P1/P1)

=10 (-0.6)

=-6.02

So P2 =-6.02

We know that P2 = 0.25 P1

There for P1=P2/0.25

=-6.02/0.25

=-24

# CS601 Assignment no 3 Solution By Talha Junaid

Attachments:

Q1 answer is wrong

# CS 601 assignment 3 soluton By emanmalik97

Attachments:

1

2

3

4

5

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