Question a describe the following modes of wave, Ask an Expert

Engineering

Question :

a) Describe the following modes of wave propagation:

- Line of sight
- Ground waves
- Skywaves

b) Why can waves with a very low frequency be used for submarine communication? Give one reason why are they not used for data transmission in mobile phones and computer networks.

c) A Line-of-sight (LOS) is usually required between a sender and receiver for radio waves with frequency > 30 MHz, nevertheless, mobile phones can work in big cities without such LOS. Explain.

d) Spread spectrum is a technique which generates signals which are strong and loud, that is resistant to interference. Explain how this is achieved.

e) Briefly explain how directional and omni-direction antennas work. Is a directional antenna suitable for mobile phone communication?

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Computer Engineering, Engineering

Category:- Computer Engineering
Reference No.:- M9589915

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