Wireless Networks and Communication expert

Part I: Encoding and error control
Sam is a computer science student and working on a new micro robot design. The robot
continuously sends every two seconds a status string comprising the accelerometer
reading (4 bits), ultrasound obstacle detection (6 bits), motor functionality (4 bits) and
battery power level (2 bits).
a) Calculate the data rate required for robot to remote controller communication
b) Explain 3 types of suitable encoding techniques could be used to encode the
status string.
c) At a certain instance, the sensors provided data as acceleration 5 m/s2
,
obstacle at 48 cm, all motors working (i.e. motor functionality 1111), and
battery is 75%.
i. Write the status string in binary for this instance
ii. Represent the status string on ASK, FSK, and PSK encoding techniques
d) Calculate the CRC for the status string derived in c) with polynomial divisor
11001101
e) Briefly explain some other error control and
MITS5003 Wireless Networks and Communication
i. For 48 subscribers what should be the subcarrier bandwidth ( fb ) ?
ii. Propose a suitable subcarrier bit time of T to achieve orthogonality
iii. Explain how OFDM overcomes the issue of inter symbol interference
(ISI)
Part III: Wi-Fi
Prime Living is a real estate company based in Victoria and you work form them as a consultant
network engineer. The company has decided to open a new office in South Eastern suburbs and the
floor plan of the building is shown below. The office consists of 5 rooms and on average 8 employees
work at each room. The lounge is used by both staff and customers and on average about 25 devices
connect to Wi-Fi. The clients wants you to design the network for them with at least 100 Mbps data
rate for all wireless connections. As resources you’ve got one distribution system and few access
points of 10 m range.
10 m
10 m
10 m
10 m
10 m
10 m
10 m
5 m
10 m
5 m
Lounge and reception
MITS5003 Wireless Networks and Communication
a) Design the network specifying the locations of access points and distributions
system showing the backbone network.
b) Calculate the BSS and ESS sizes
c) Calculate the throughput for the DS
d) Recommend a suitable IEEE substandard for the network and give reasons for
your choice
e) Recommend suitable security strategies for the network