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CS431 Assignment 1 Solution and Discussion

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Re: CS431 Assignment 1 Solution and Discussion

Assignment No. 01
Semester: Spring 2020
Wireless Communications – CS431 Total Marks: 10
Due Date: 30-05-2020
Assignment Objective:
• To enhance the student knowledge about the application and usage of different types of transmission medium along with different frequency ranges.
Uploading instructions:
• Your assignment must be in .doc or .docx format (Any other formats like scan images, pdf, bmp, etc will not be accepted).
• Save your assignment with your ID (e.g. bc020200786.doc).
• No assignment will be accepted through email.
Rules for Marking:
It should be clear that your assignment will not get any credit if:
• The assignment is submitted after due date.
• The submitted assignment does not open or file is corrupted.
• Your assignment is copied from internet, handouts or from any other student
• Assignment is covered from lectures 01 to 03.
For any query about the assignment, contact at [email protected]

Assignment Questions
Question No.1 (5 Marks)
Mr. Ahmad is a telecom engineer and he is going to establish a CCTV system for his “ABC organization”. He will install towers at some specific distances to monitor the movement of the people around the “ABC organization”.
Keeping in view the above scenario, answer the following questions with solid reasons:

(a) Which type of microwaves will be required for transmission?
(b) Which type of transmission medium will be used in this scenario?

Question No. 2 (5 Marks)
Consider a channel with a bandwidth of 20 kHz transmitting a signal with two signal levels. You are required to calculate the maximum data bit-rate of a noiseless channel? Mention all necessary formula/calculation steps.

Best of Luck

CS431 - Wireless Communication
CS431 Assignment 3 Solution and Discussion

Assignment No. 03
Semester: Fall 2019
Wireless Communications – CS431
Total Marks: 15
Due Date: Jan 20, 2020
Assignment Objectives:

The objective of the assignment is the enhance the capabilities of students about:
• Wireless application protocol in a cellular network in the wireless communication.
• How to creat IP tunnel from home network to foreign network in wireless communication.

Uploading instructions:

• Your assignment must be in .doc/.docx format (Any other formats like scan images, PDF, bmp, etc will not be accepted).
• Save your assignment with your ID (e.g. bc020200786.doc).
• No assignment will be accepted through email.

Rules for Marking:

• The assignment is submitted after due date.
• The submitted assignment does not open or file is corrupted.
• Your assignment is copied from internet, handouts or from any other student
(Strict disciplinary action will be taken in this case).

For any query about the assignment, contact at [email protected]

Assignment

Question#1 (10 Marks)
A node with IP address 194.122.122.17 wants to send data packets to a mobile node having IP address 194.100.100.25 with home address 194.100.100.15.
Mobile node moved to a foreign network having foreign agent with IP 194.133.133.20. In foreign network, the mobile node is registered at the foreign agent and an IP tunnel is created from home network to foreign network. You are required to show the outer header and inner header of the IP tunnel with source and destination addresses of each header.

Question#2 (3 + 2 = 5 Marks)
a) To deploy mobile IP, some of the entities are important to include without whome the mobile IP can not be deployed. You are required to write the name of those major entities.
b) In satellite based wireless network, which protocol in WAP stack is responsible for maintaining the sessions?

Best of Luck

CS431 - Wireless Communication
CS431 Assignment 2 Solution and Discussion

Assignment No. 02
Semester: Fall 2019
Wireless Communications – CS431
Total Marks: 20
Due Date: Nov 29, 2019
Assignment Objectives:

The objective of the assignment is the enhance the capabilities of students about:
• To understand about the transponder method for multiple access feasibility and various techniques used in multiple access.
• To understand about the network services used in WAN wireless communication network expanded globally.

Uploading instructions:

• Your assignment must be in .doc/.docx format (Any other formats like scan images, PDF, bmp, etc will not be accepted).
• Save your assignment with your ID (e.g. bc020200786.doc).
• No assignment will be accepted through email.

Rules for Marking:

• The assignment is submitted after due date.
• The submitted assignment does not open or file is corrupted.
• Your assignment is copied from internet, handouts or from any other student
(Strict disciplinary action will be taken in this case).

For any query about the assignment, contact at [email protected]

Assignment

Question#1 (15 Marks)
An organization is going to install a system to provide a satellite communication and wants to make it feasible for different type of communication traffic (multiple access). There are different schemes available to accomplish this purpose.
Being a network adviser, you are required to suggest atleast two most appropriate schemes that the organization should follow. Also explain their 2 benefits and 2 drawbacks?

Question#2 (5 Marks)
A cellular communication network is operating globally. You are required to identify which type of communication service network is providing? Explain with a simple example.

Best of Luck

CS431 - Wireless Communication
CS431 Assignment 1 Solution and Discussion

Assignment No. 01
Semester: Fall 2019
Wireless Communications – CS431
Total Marks: 20
Due Date: Nov 15, 2019

Objectives of this assignment are:

• To understand how to overcome a signal attenuation problem.
• To understand the method with minimum code to make error free wireless communication.

Instructions:
Please read the following instructions carefully before solving & submitting the assignment:
The assignment will not be accepted after due date. Zero marks will be awarded if the assignment does not open or the file is corrupt. The assignment file must be an MS Word (.doc/.docx) file format; Assignment will not be accepted in any other format. Zero marks will be awarded if assignment is copied (from other student or copied from handouts or internet). Zero marks will be awarded if Student ID is not mentioned in the assignment file.
This assignment covers week 1 to week 3 lectures.

For any query about the assignment, contact at [email protected]

Assignment Questions

Question#1 (10 Marks)
An organization has its satellite based network that it provides direct broadcast services. This organization comes across signal attenuation problem due to the long distance communication links which results in the poor service.
As a network engineer, what you will advise to that organization to compensate this attenuation?

Question#2 (10 Marks)
A wide area network based organization wants to make error free communication by using CRC error detection technique. In addition the organization wants to keep the transmission code in minimum of its length.

Being a networking engineer, which one of the following would you suggest to the organization to achieve its goal?
Polynomials Error Correction Hamming Code
Support your answer with atleast one valid example.

Best of Luck

CS431 - Wireless Communication

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CS431 Assignment 1 Solution and Discussion
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CS431 Assignment 3 Solution and Discussion
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@zaasmi thank you so much sir
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Answer to Q#1
Modern transponders can carry many different types of communications traffic. They can also receive signals from multiple ground stations, combining (multiplexing) or splitting (de-multiplexing) them for onwards transmission to other multiple ground stations. This method, by which many users share a common satellite resource, is called Multiple Access. There are several schemes for accomplishing this, each with its benefits and drawbacks.

TDMA (Time Division Multiple Access) allocates a time slot to the user in a repetitive time frame. The signal is digitized and the data bits are stored in a buffer in a compressed time frame until their allocated time slot comes around when they are transmitted during their allocated time. At the receiver end of the link the bits are rearranged, spreading them out to reassemble the original digital signal and converted back to analogue form. The signal occupies the entire transponder bandwidth, but only during its allocated time slot. The rest of the time the bandwidth is available to other users. Digital signals typically have better noise immunity than analogue signals.

FDMA (Frequency Division Multiple Access) shares the bandwidth between the users, with each user allocated a unique, narrower section of the available bandwidth. It works with analogue signals and all users have uninterrupted use of their own narrow frequency band or channel with all users occupying the available bandwidth simultaneously, each within their own narrow channel. The sender’s signal, called the baseband signal, is frequency shifted into the allocated frequency band for transmission and the receiver restores it back to the baseband.

CDMA (Code Division Multiple Access) also known a Spread Spectrum, modulates the user’s signal with a pseudorandom code so that it occupies the full available spectrum, appearing as noise. The receiver uses the same pseudorandom code in an auto correlator device, which only recognizes a signal modulated with the same auto code and thus separates it from the noise. CDMA is more complex but has better noise immunity and provides greater security than the other two systems.

Answer to Q#2
• Mobile Service Satellites (MSS)
• Example: Satellite Phones
CS431 Assignment 1 Solution and Discussion
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Answer to Q#1

A transponder is a wireless communications, monitoring, or control device that picks up and automatically responds to an incoming signal.
Transponders are microwave repeaters located at intermediate points in a communications link, which are used to compensate for the signal attenuation along the route to extend the range of the link. They receive the very weak signals from a sender at one end of the link, amplify them, and re-transmit them at much higher power to the receiver at the other end of the link. The whole purpose of a communications satellite system is to place a transponder in position, to keep it there and to keep it powered up. Because of the very high launch costs, for satellite systems to be economically justified, the transponder should be able to carry high traffic volumes including television channels as well as dozens of multiplexed voice communications and other data links. It should also be small and light.

Questions: Marks 10

Question # 1 Marks 10
An organization has its satellite-based network that it provides direct broadcast services. This organization comes across signal attenuation problem due to the long distance communication links, which results in the poor service.
As a network engineer, what you will advise to that organization to compensate this attenuation?

Answer to Q#1

A transponder is a wireless communications, monitoring, or control device that picks up and automatically responds to an incoming signal.
Transponders are microwave repeaters located at intermediate points in a communications link, which are used to compensate for the signal attenuation along the route to extend the range of the link. They receive the very weak signals from a sender at one end of the link, amplify them, and re-transmit them at much higher power to the receiver at the other end of the link. The whole purpose of a communications satellite system is to place a transponder in position, to keep it there and to keep it powered up. Because of the very high launch costs, for satellite systems to be economically justified, the transponder should be able to carry high traffic volumes including television channels as well as dozens of multiplexed voice communications and other data links. It should also be small and light.

Answer to Q#2
Being a networking engineer, he should suggest the use of polynomial codes to the organization for desired objective.
The benefits of using polynomial codes is that it produces short codes. For example, here a 6-bit pattern is replaced by 3 terms.
In polynomial codes, the degree is 1 less than the number of bits in the binary pattern. The degree of polynomial is the highest power in polynomial. For example as shown in fig degree of polynomial x5 +x2 + 1 are 5. The bit pattern in this case is 6.
A pattern of Os and 1s can be represented as a polynomial with coefficient of o and 1.
Here, the power of each term shows the position of the bit and the coefficient shows the values of the bit.
For example, if binary pattern is 100101, its corresponding polynomial representation is x5 + x2 + 1. Figure shows the polynomial where all the terms with zero coefficient are removed and x J is replaced by x and XO by 1.

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CS431 Assignment 1 Solution and Discussion
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CS431 Assignment 1 Solution and Discussion
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