What are the main challenges for mobile computing, Operating System

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Question:

(a) What are the main challenges for Mobile Computing?

(b) 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.

(d) What is meant by digital modulation? Illustrate you answer with a diagram.

(e) How could you modify the basic phase shift keying modulation technique to improve efficiency?

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