Modulation and Demodulation?

Q1.
What is modulation? What is Demodulation?
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Q2.
What happens to the wireless signal as it propagates? (does it weaken or strengthen , why , how)
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Q3.
What is the relation between bandwidth and data rate? What does shannon’s capacity theorem tell you about capacity and its limits?
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Q4.
Are there ways of beating the max capacity of a channel given by shannon’s limit?
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Q5.
If a channel is good then we can use more complex modulation schemes. Explain.
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Q6.
OFDM is the most efficient scheme available. Explain.
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Q7.
What is common between 802.11ac, 4G, UWB (one specific version) and many other modern telecommunication systems.
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Q8.
MIMO systems may give better speeds but these are limited by the physical size of the devices. Discuss.
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Q9.
In wireless signal propagation what causes Inter-symbol-interference (ISI)? How does it impact the quality of signal received?
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Q10. Explain how UWB fights multipath problem within a wireless channel.
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Q11. Explain the evolution of mobile communication systems from 2G to 3G in terms of speeds, technology and limitations.
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Q12. Explain the strengths of a Bluetooth based communication hardware. Why can’t it be used for high-speed communications, like wirelessHD?

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Q13. What are the differences between 3G and 4G communication systems?

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Q14. Explain the technology used in the WirelessHD standard. Can this system work indoor and outdoors at same speeds? Explain your answer.

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Q15. How are users and their transmissions separated in a WCDMA system? Explain your answer.

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Q16. Explain why MIMO systems may offer better data rates than similar single antenna systems.
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Q17.
How does overlay communication systems help in the spectral shortage scenarios?
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Q18 What is frequency reuse distance and how does it impact the Signal to interference Ratio in a mobile cell?
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