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17192002 Pages:2

PART (^

Answer any two full questions, each carries 20 marks
Explain the importance of 174 sequence ൧൨ spread spectrum
communication.Differentiate between fast frequency hopping and slow frequency
hopping.
What are diversity techniques? Explain how they are implemented intime, space&
frequency.
Explain the techniques for generation of PN sequences. What are the properties of
PN sequences?
Derive the expression for processing gain of MFSK. A fast frequency hopping
MEFSK system has the following parameters. Number of bits per MFSK symbol=8,
Number of hops per MFSK symbol= 8. Calculate the processing gain.
Explain the difference between coherence bandwidth and coherence time.
Discuss synchronisation techniques.
With relevant block schematic, explain how a RAKE receiver can improve

theperformance of CDMA communication system.

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