Scribd
Upload
45 views2 pages

Answer All The Questions

This document contains two practice exam papers for the subject Wireless Communication from the National Institute of Technology in Tiruchirappalli, India. The first paper contains 6 questions and was given in August 2018. The second paper contains 6 questions and was given in October 2018. Both papers ask conceptual and calculation questions related to topics in wireless communication systems including cellular network configuration, multipath propagation modeling, and multiple access techniques.

Uploaded by

Sai Anirudh Sanagaram
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
45 views2 pages

Answer All The Questions

This document contains two practice exam papers for the subject Wireless Communication from the National Institute of Technology in Tiruchirappalli, India. The first paper contains 6 questions and was given in August 2018. The second paper contains 6 questions and was given in October 2018. Both papers ask conceptual and calculation questions related to topics in wireless communication systems including cellular network configuration, multipath propagation modeling, and multiple access techniques.

Uploaded by

Sai Anirudh Sanagaram
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
You are on page 1/ 2

NATIONAL INSTITUTE OF TECHNOLOGY, TIRUCHIRAPALLI-620 015

B.Tech. DEGREE, VII SEMESTER, FIRST CYCLE TEST, AUG-2018

Branch: ECE
Sub. Code: ECPC27 Wireless Communication Max. marks: 20
Date: 28.08.2018 Time: 3:30-4:30PM

ANSWER ALL THE QUESTIONS

1. Using a suitable diagram, list the steps involved in establishing a call to the mobile user by
a landline subscriber. [3]
2. Brief with a suitable diagram how sectoring can be used to achieve capacity improvement?
Compare this with cell splitting technique. [3]
3. In a dense urban area, with path loss component=4.5 and required SIR=13 dB, calculate
the reuse factor and cluster size used for maximum capacity. Assume there are six co-
channel cells in the first tier and all of them are at the same distance from mobile. [3]
2h h
4. Prove that in a two-ray ground reflection model,Path difference ≈ t r . Show when this
d
holds as a good approximation. [4]
5. With a suitable illustration brief the handoff scenario for a mobile unit located at the cell
boundary highlighting the improper handoff case. [3]
6. Compute the loss due to knife-edge geometry shown in the figure. Assume f=900 MHz [4]
NATIONAL INSTITUTE OF TECHNOLOGY, TIRUCHIRAPALLI-620 015
B.Tech. DEGREE, VII SEMESTER, II CYCLE TEST, OCT-2018

Branch: ECE
Sub. Code: ECPC27 Wireless Communication Max. Marks: 20
Date: 12.08.2018 Time: 2:30-3:30PM

ANSWER ALL THE QUESTIONS

1. With suitable expressions, explain an Impulse response model of a multipath


propagation channel. [4]
2. Calculate the mean excess delay, RMS delay spread for the multipath profile given
in the figure below. Estimate the 50% coherence bandwidth of the channel. [3]

3. Why does frequency selective fading occur? How does it correspond to ISI? Brief. [3]
4. How is an effective antenna height measured and how should the antennas be placed
for better signal reception in hilly terrain configuration. Brief with suitable diagram. [4]
5. How is CCI reduced with tilting antenna configuration? [2]
6. Note on the features of TDMA system. The GSM TDMS system uses a 270.833 kbps
data rate to support eight users per frame, [2+2]
a. What is the raw data provided for each user?
b. If guard time, ramp-up, and synchronization bit occupancy 10.1 kbps,
determine the traffic efficiency for each user.

**************************************************

You might also like