STUPIDSID
1 (a)
How co-channel interference and system capacity are related?
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1 (b)
If 20 MHz of total spectrum is allocated for a duplex wireless cellular system
and each simplex channel has 25 kHz RF bandwidth, find:
(i) The number of duplex channels
(ii) The total number of channels per cell site ,if N=4 cell reuse is used
(i) The number of duplex channels
(ii) The total number of channels per cell site ,if N=4 cell reuse is used
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2 (a)
If a transmitter produces 50 W of power, express the transmit power in units of
(i) dBm and (ii) dBW. If 50 W is applied to a unity gain antenna with a 900 MHz
carrier frequency, find the received power in dBm at a free space distance of
100 m from the antenna. What is Pr(10 km)? Assume unity gain for the receiver
Antenna.
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2 (b)
Define and explain mean excess delay, rms delay spread and excess delay spread.
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2 (c)
Explain coherence time and coherence bandwidth.
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3 (a)
Which are various multiple access schemes used in wireless communications?
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3 (b)
Explain any one technique of small-scale multipath measurements.
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3 (c)
Briefly explain GSM logical channels.
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3 (d)
With the help of timing parameters, explain frame structure for GSM.
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4 (a)
How does GSM radio subsystem work?
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4 (b)
Give differences between HLR and VLR functions.
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4 (c)
Which are commonly used wireless propagation models? How do they differ?
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4 (d)
How do diversity techniques help in improving SNR?
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5 (a)
Discuss the concept of spread spectrum.
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5 (b)
Explain how power control is achieved in CDMA.
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5 (c)
With the help of a neat sketch, describe GPRS architecture.
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5 (d)
Compare Wi-Fi and Wi-MAX system parameters .
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