Explain the following spread spectrum techniques, Other Engineering

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Question :

What is the ISM band and what is particular about this frequency band? Name two wireless technologies that make use of the ISM frequency band.

a) Explain the following spread spectrum techniques:

i) Frequency Hopping Spread Spectrum
ii) Direct Sequence Spread Spectrum

b) Describe the functioning of a Bluetooth piconet? Include the discussion of the concept of Master, slave, stand-by and parked devices in your description of the Bluetooth piconet.

c) Compare the given features of Bluetooth, Ultra Wide Band and WiFi:

Data rate, Coverage (distance covered), Application focus.

d) Consider the security aspects in both Wireless Local Area Networks (WLANs) and Wireless Personal Area Networks (WPANs).

i) What are the security problems introduced in Wireless LANs and Wireless PANs?

ii) What level of security can the IEEE 802.11 and Bluetooth standards provide?


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