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2003 Course Advanced Communication Systems (Elective II)

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Total No. of Questions : 12] P992 [Total No. of Pages : 4 [3664]-206 B.E. (E & TC) 40425: ADVANCED COMMUNICATION SYSTEMS (Elective - II) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answer 3 questions from Section I and 3 questions from Section II. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. Assume suitable data, if necessary. SECTION - I Q1) a) What are the key system features of WDM? List and explain. b) Explain the principal role of Tunable Filter with neat diagram. c) Enlist the basic applications and types of Optical Amplifiers . [6] [5] [5] OR Q2) a) What are the operational principles of WDM? Explain with neat diagram. [6] b) Explain the principal role of Star Coupler with neat diagram. [5] c) Define and explain the Wavelength Converters . [5] Q3) a) What is meant by Broadcast-and-Select WDM networks? Draw the physical architecture of a Broadcast-and-Select Single-Hop Network and explain its detail. [8] b) List important challenges encountered while designing an optical networks? What are the Nonlinear effects on network performance and their possible solutions? [8] OR Q4) a) Why SONET/SDH Rings are commonly called self-healing rings ? Draw and explain the two-fiber unidirectional and bidirectional network configurations. [8] b) Write the applications and notes on Optical Spectrum Analyzer (OSA) . [8] P.T.O. Q5) a) Define and explain the following terms with respect to the satellite communication: [8] i) Equator. ii) Longitude. iii) Prime meridian. iv) Major circles of latitude. b) What is termed as Sun Transit Outage ? Explain in detail. [5] c) Calculate the Azimuth & Elevation angles to a geosynchronous satellite in the Indian Ocean operated by INSAT. The details of the earth station and the satellite are as follows : [5] Earth station latitude and longitude are 74.0 N and 0 Satellite longitude (subsatellite point) is 66.0 OR Q6) a) Define and explain the following terms with respect to the satellite [8] communication : i) Poles. ii) Latitude. iii) Hemispheres. iv) Greenwich Meridian. b) What is termed as Subsatellite Points ? Explain in detail. [5] c) A satellite is in an elliptical orbit with a perigee of 1400 km and an apogee of 3900 km. Using mean earth radius of 6378.14 km, find the period of the orbit in Hours, Minutes and Seconds. [5] SECTION - II Q7) a) Define and explain the following terms : i) Pre-emphasis and De-emphasis. ii) Sampling and Quantizing. [8] b) A standard NTSC signal has a base band video bandwidth of 4.2 MHz and is transmitted over the satellite link in an RF bandwidth of 30 MHz using Frequency Modulation and standard Pre-emphasis and De-emphasis. At the receiving earth station the C/N ratio in clear air conditions is 15 dB. Calculate the base band Signal to Noise ratio for the video signal. Assume a de-emphasis improvement of 9 dB and a subjective improvement factor of 8 dB in the base band signal to noise ratio. [8] OR [3664]-206 2 Q8) a) Define and explain the following terms : i) Bit and Symbol Error rate. ii) Compression and Expansion. [8] b) A Single Channel Per Carrier Frequency Modulation satellite link has an RF channel bandwidth of 36 kHz and a base band maximum frequency of 4 kHz. De-emphasis provides a subjective improvement in base band S/N ratio of 8 dB. Calculate the base band S/N ratio for the voice channel for a receiver C/N ratio of 15 dB. If the FM demodulator has an FM threshold at 8 dB, what is the link margin for this system? [8] Q9) a) Explain and define the following terms in detail. i) Effective Isotropic Radiated Power. ii) Carrier to Noise ratio. [8] b) Consider that the satellite communication receiver operating at 4 GHz has the following gains and noise temperatures : [8] Tin = 25 K GRF = 23 dB TRF = 50 K GIF = 30 dB TIF = 1000 K Tm = 500 K Calculate the system Noise Temperature assuming that the mixer has a gain Gm = 0dB. Recalculate the system noise temperature when the mixer has a 10 dB loss. How can the Noise Temperature of the receiver be minimized when the mixer has a loss of 10 dB? OR Q10) a) Explain and define the following terms in detail. i) Direct Broadcast Satellite Television. ii) G/T ratio. [8] b) A satellite receiver operates at 6 GHz, has an LNA with a gain of 50 dB records the following gains and noise temperatures : [8] GRF = 23 dB Tin = 50 K TRF = 50 K GIF = 30 dB TIF = 1000 K Gm = 0 dB Tm = 500 K A section of lossy wave guide with an attenuation of 2 dB is inserted between the antenna and the RF amplifier. Find the new system noise temperature for a wave guide temperature of 300 K. [3664]-206 3 Q11) a) Compare various multiple access techniques with respect to their parameters and performance characteristics. [8] b) With reference to VSAT earth station engineering, write detailed notes on : [10] i) Antennas and their feed mechanisms. ii) Transmitters and Receivers. OR Q12) a) Draw and explain various network implementations of VSAT in detail.[8] b) Write detailed notes on : i) ii) [10] Multiple Access Techniques. Link power budget. [3664]-206 4

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