MITS5003Wireless Networks & Communication –

2019SS

Assignment No 2

Submission Due Date: 17/01/2020 before 5 pm

Submission Guidelines:

All submissions are to be submitted through turn-it-in. Drop-boxes linked to turn-it-in will be

set up in the Unit of Study Moodle account. Assignments not submitted through these drop-

boxes will not be considered.

Submissions must be made by the due date and time.

The turn-it-in similarity score will be used in determining the level if any of plagiarism. Turn-it-in

will check conference web-sites, Journal articles, the Web and your own class member

submissions for plagiarism. You can see your turn-it-in similarity score when you submit your

assignment to the appropriate drop-box. If this is a concern you will have a chance to change

your assignment and re-submit. However, re-submission is only allowed prior to the submission

due date and time. After the due date and time have elapsed you cannot make re-submissions

and you will have to live with the similarity score as there will be no chance for changing. Thus,

plan early and submit early to take advantage of this feature. You can make multiple

submissions, but please remember we only see the last submission, and the date and time you

submitted will be taken from that submission.

Your document should be a single word or pdf document containing your report.

1. Convert the binary data “101010000111” into analog waveforms using following

modulation techniques:

a. Two level Amplitude Shift Keying

b. Two level Frequency Shift Keying

c. Two level Phase Shift Keying

d. Differential Phase shift keying

e. Four level Amplitude Shift Keying

f. Four level Phase Shift Keying

g. Eight level Amplitude Shift Keying

2. For the above techniques, let suppose the time required to send one signal is 1 us.

Compute the time required to send the whole data for all the techniques.

3. With fc = 1000 kHz, fd = 50 kHz, and M = 16 (L = 4 bits), using Multiple Frequency-Shift

Keying (MFSK), compute the frequency assignments for each of the sixteen possible 4-

bit data combinations.

4. Draw the approximate Analog Modulation and Frequency Modulation waveforms in

complete steps for the following signal:

5. Draw the 8 QAM Constellation Diagram having two different amplitude levels and four

different phase levels.

6. Considering the figure for the handoff situation and the mobile user is moving from Base

station A to Base station B, answers the following questions.

I. At what location, the handoff takes place considering Relative signal strength?

II. At what location, the handoff takes place considering Relative signal strength with

threshold TH1?

III. At what location, the handoff takes place considering Relative signal strength with

threshold TH2?

I

V. At what location, the handoff takes place considering Relative signal strength with

threshold TH3?

V. At what location, the handoff takes place considering Relative signal strength with

hysteresis?

VI. At what location, the handoff takes place considering Relative signal strength with

hysteresis and threshold TH1?

VII. At what location, the handoff takes place considering Relative signal strength with

hysteresis and threshold TH2?

VIII. At what location, the handoff takes place considering Relative signal strength with

hysteresis and threshold TH3?

7. Explain and draw the Error Detection Process for Cyclic Redundancy Check (CRC).

8. Considering the following information:

We have 5 Users/Channels present in a cellular communication network labelled as U1,

U2, U3, U4, U5. The Number of total calls in a whole duration of 180 mins for these users

are represented as C1, C2, C3, C4, C5 and Number of durations for all the calls for these

users are represented as T1, T2, T3, T4, T5. The values for these parameters are given as:

T1 = 5 mins, T2 = 15 mins, T3 = 40 mins, T4 = 70 mins, T5 = 20 mins.

C1 = 10 calls, C2 = 15 calls, C3 = 2 calls, C4 = 20 calls, C5 = 5 calls.

Compute the following:

I. Total Occupied Time.

II. Total Number of calls.

III. Mean Occupied time per call.

IV. Mean Rate of Calls per min.

V. Traffic intensity.

9. Explain why the square and circle shapes cells for cellular communications are not

appropriate as compared to hexagonal shape cells.