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Paper / Subject Code: 42472 / MOBILE COMMUNICATION SYSTEM

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June 6, 2024 10:30 am - 01:30 pm 1T01037 - B.E.(Electronics and Telecommunication )(SEM-VII)

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(Choice Base Credit Grading System ) (R- 2019-20)(C Scheme) / 42472 - MOBILE COMMUNICATION

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SYSTEM QP CODE: 10054713

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Duration: 3hrs [Max Marks: 80]

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N.B. : (1) Question No 1 is Compulsory.

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(2) Attempt any three questions out of the remaining five.

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(3) All questions carry equal marks.

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(4) Assume suitable data, if required, and state it clearly.

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1 Attempt any FOUR [20]

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a Why the shape of the cell is hexagaon ? [5]

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b Differentiate between Rayleigh distribution and Ricean distribution [5]

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c What is handoff ? state its types. Explain mobile assisted handoff. [5]

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d Explain the merits and demerits of a millimeter bands [5]

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e How power control is achieved in CDMA-2000 technology [5]

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2 a If a transmitter produces 50 watts of power, express the transmitter power in [10]

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units of
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(a) dBm and (b) dBW. If 50 watts is applied to a unity gain antenna with a

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900MHz carrier frequency, find a receiver power in dBm at a free space

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distance of 100m from the antenna. What is Pr (10km) ? Assume unity gain for
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the receiver antenna.
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b Draw UMTS network architecture with interfaces and explain. Give [10]
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specifications.
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3 a What is MIMO? State and explain its types with suitable diagram. 22 [10]

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b Discuss factors influencing small scale fading. [10]

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4 a [10]
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Consider a transmitter which radiates sinusoidal carrier frequency of

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1850MHz. For a vehicle moving 60 mph, compute the received carrier

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frequency if the mobile is moving (a) directly towards the transmitter (b)
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directly away from the transmitter (c) in a direction which is perpendicular to

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the direction of arrival of the transmitted signal.

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b Illustrate 3GPP core network architecture and explain functions of each block [10]
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in detail.
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5 a Draw and explain GSM signaling protocol architecture [10]

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b Explain RAKE receiver . [10]

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6 a What are the attributes of WCDMA system. Explain WCDMA channels. [10]
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b Write a note on (any TWO) [10]

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i) GSM frame structure

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ii) PAPR in OFDM

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iii) Beamforming
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______________________
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54713 Page 1 of 1
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