Hall Ticket No Question Paper Code: BES002
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
M.Tech I Semester End Examinations (Regular) January/February, 2018
Regulation: IARE-R16
WIRELESS LANS AND PANS
(Embedded Systems)
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Compare 1G to 4G cellular systems with a neat block diagram.
Discuss briefly about the 4G technologies.
2. What do you mean by Carrier Sense and Collision Detection? Explain briefly.
What are the performance techniques used in the design of collision detection protocol and show
that the best channel utilization with pure ALOHA is 18.4%.
UNIT II
3. What are the three media that can be used for transmission over wireless LANs? Describe the
direct sequence spread spectrum technology with an example.
Consider a WLAN installation in which the maximum propagation delay is 0.4 sec. The WLAN
operates at a data rate of 10 Mbps, and packets have 400 bits.Calculate the normalized throughput
with
i. An unslotted nonpersistent
ii. A slotted persistent CSMA protocol
4. List out the properties of Pseudo Noise sequence used in direct sequence spread spectrum technique.

List out the advantages, limitations and challenges of WLAN technology.
UNIT III
5. With a neat sketch explain the network topologies of basic service set mode and extended
service set mode.
What is the technique used for the purpose of selecting the access points by the stations and list
out the steps involved in the technique.
6. Discuss in detail about the hidden terminal problem and collision avoidance corresponding to
MAC layer issues.
With neat sketch explain the interference scenarios between Bluetooth and IEEE 802.11 device.

Page 1 of 2
UNIT IV
7. What is WPAN and write short notes on Bluetooth technology includes characteristics, applications
and air interface parameters.
Explain neatly about the Bluetooth protocol stack.
8. Explain the formation of piconet and scatternet topologies with neat sketch.
Explain the Bluetooth packet transmission/flow structure clearly.
UNIT V
9. Write down about topologies that ZigBee technology supports.
Draw the IEEE 802.15.4 LR-WPAN device architecture and discuss about channel frequencies
and PHY packet structure.
10. Explain clearly the MAC frame format and super frame structure of IEEE 802.15.4 LR-WPAN.

Briefly discuss about IEEE 802.15 working group for WPANS, and describe the IEEE 802.15.3MAC
and PHY layer in brief.