Download PTU M.Tech. ECE 1st Semester 36205 ADVANCE COMMUNICATION SYSTEM Question Paper

Roll No.

Total No. of Pages : 02

Total No. of Questions : 08

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

ADVANCE COMMUNICATION SYSTEM

Subject Code : EC-504

M.Code: 36205

Time: 3 Hrs.

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Max. Marks : 100

INSTRUCTION TO CANDIDATES :

1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWENTY marks.

1. a) What is the significance of carrier recovery and clock recovery circuit in digital communication system? Explain how these can be achieved. 10
   

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   b) Define Bit rate and Baud rate. Determine peak frequency deviation, minimum bandwidth and baud rate for a binary FSK signal with a marks frequency of 49 KHz, a space frequency of 51 KHz and input bit rate. 10
2. a) Discuss the fundamental limitations on the performance of communication systems. 10
   b) What is the difference between PCM and DPCM? Give the working of each. 10
3. a) Discuss the significance of WDM in modern optical communication systems. How does it differ from TDM? 10
   b) Explain SONET in brief. 10

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4. a) Explain different Transmission protocols used in mobile communication. 10
   b) Discuss the role of QoS in mobile communication. 10
5. Explain :
   a) GPRS 10
   b) Delta modulation 10

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6. a) Discuss in detail the basic transmission theory of Satellite Communication. 15
   b) An earth station antenna has diameter of 30 m has an overall efficiency of 68% and is used to receive a signal of 4150 MHz. At this frequency the noise temperature is 79K when the antenna appoints to the satellite at an elevation angle of 28 degree. Determine earth station G/T ratio under these conditions. If heavy rain causes sky temperature to increase so that the system temperature increases to 88 K, What will be the new G/T value? 5
7. a) Discuss how the design of satellite links is accomplished for specified C/N values? 10
   b) Explain CDMA used in satellite communications. What are its advantages? 10
8. Discuss :
   

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   a) Switching in Optical networks 10
   b) Fading in mobile communication. 10

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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