Question Paper of ADVANCE COMMUNICATION SYSTEM for M.Tech (ECE) (Sem.- 1st), Subject Code: EC-504, Paper ID [ E0564 ], PTU Question Paper.

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Total No. of Questions: 08

M. Tech (ECE) (Sem.-1^st)

ADVANCE COMMUNICATION SYSTEM

Subject Code: EC-504

Paper ID: [E0564]

Time: 3 Hrs.                                                                 Max. Marks: 100

Instruction to Candidates:

1.      Attempt any FIVE questions.

2.      All question carry EQUAL marks.

1.     (a) In a digital CW communication system, the bit rate of NRZ data streams in 1Mbps and carrier frequency of  transmission is 100Mhz.  Find  the symbol rate of Transmission and band width requirement of the channel in following systems. (1) BPSK system (2) QPSK system.

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(b) What are the fundamental limitations of a communication system?

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(c) Give detail of digital transmission impairments.

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2.     (a) In a binary PCM system, the output signal to quantizing noise ratio is to be held to a Minimum value of 40db. Determine the number of required levels and find the corresponding output signal to noise ratio.

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(b) Write applications of digital communication system. 

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3.     (a) Explain SDH with its frame format.

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(b) Explain the Architecture of Optical Transport Network.

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4.     (a) With the help of necessary expression, show that transmission loss in a satellite Communication system is directly proportional to frequency and distance.

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(b) Explain the following terms with reference to satellite communication.

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(1) Apogee

(2) Perigee

(3) Orbital velocity

(4) Pay load

(5) Satellite launch vehicle

5.     (a) List different Performance metrics that may be used to make the handoff decision.

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(b) What are the advantages of using CDMA for a cellular network?

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(c) From signal space diagram derive the formula of probability of error of BPSK and QPSK modulation techniques.

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6.     (a) How is one TDM signal separated into its original components? Discuss the duration of a data unit before and after the TDM process.

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(b) Among Space-Division switching and Time-Division switching which one is superior and why?

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7.     (a) How is an STS multiplexer different from a add/drop multiplexer, since both can add signals? Also give relationship between SONET and SDH.

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(b) What is the advantage of controlled Access over Random Access? List in order the protocols that evolved from MA.

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8.     Write short note on following:

(a)  DPCM

(b) VSAT

(c)  WDM

(d) FDMA

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