Communication Engineering - Exam Paper May 2009- Electrical Engineering - 7th Semester , Exams of Electrical Engineering

Download Communication Engineering - Exam Paper May 2009- Electrical Engineering - 7th Semester and more Exams Electrical Engineering in PDF only on Docsity! eet Yr e Commun LcaTion ENG. Vpa707 (3 Hours) So -Marks : 100 Oh : (1) Question No. 1 is compulsory, Se : ol! | (2) Attempt any four questions out of remaining six questions. are? (3) Figures to the right indicate full marks. = (4) Make suitable assumptions wherever necessary. 310, / pdebabope Ape 09 2 1. (a) State and explain Shanon-Hartely Theorem. 5 (b) Explain eye pattern with a neat sketch. 5 (c) State and explain Keppler's laws. 5 (cd) Explain the terms, ‘Cell Splitting' and ‘frequency reuse’. 5 2, (a) Draw and explain orthogonal QPSK transmitter and receiver. 10 (b) Draw the block diagram of a satellite earth station and explain the working. 10 3, (a) Compare the following :— 10 (i) ISl and ICI (ii} Systematic and Non-systematic Codes (b) State and prove the Sampling Theorem for low pass signal. 10 4, (a) Explain the following terms :— 10 (i) Entropy {ii} Information rate (iii) Channel Capacity (b) Consider a telegraph source having two symbols dot and dash. The dot duration 10 is 0-2 sec. and the dash duration is 3 times the dot duration. The probability of dots occuring is twice that of dash and time between symbols is 0-2 seconds. Calculate information rate of the telegraph source. 5. (a) Explain Syndrome decoding for Cyclic codes. 10 (b) Find out the generator matrix for a systematic (7, 4) cyclic code, if 10 Gip) = pS+p+ Also find the parity check matrix. 6. (a) Explain the various losses that occur in optical fibers. 10 (b) Explain the working of a 2 Cavity Klytron with the help of a neat sketch. 10 7. Write short notes on any three :— 20 (a) Duobinary encoder (b) MTSO (c) PIN Photodiode (d) Station Keeping.