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Posted By: Nitin Bajaj Member Level: Diamond Posted Date: 13 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Electrical and Electronics Engineering PRINCIPLES OF COMMUNICATIONS (Electronics & Control Engineering) - Set 3 Question paper
III B.Tech I Semester Regular Examinations, November 2007 PRINCIPLES OF COMMUNICATIONS (Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
1. (a) Derive the Parseval’s Theorem. (b) Let x(t) = XR (t) + jXI (t) where XR is the real part of the and XI imaginary part of X(t). Show that XR (t) = 1/2[X(f) + X * (-f)] and XI = 1/2j[X(f) X * (-f)]. [8+8]
2. An AM transmitter has an unmodulated carrier power of 10kw. It can be modulated by a sinusoidal modulating voltage to a maximum depth of 40%, without overloading. If the maximum modulation index is reduced to 30% what is the extent up to which the unmodulated carrier power can be increased to avoid overloading? [16] 3. An FM signal, modulated to a depth of 8, generates a bandwidth of 180 kHz. Calculate the frequency deviation. [16]
4. Give the importance of sampling theorem in communication.
5. With reference to PCM system, explain the following: (a) Quantization error (b) companding (c) encoder (d) decoder. [16] [16]
6. (a) Explain in detail the power spectra and bandwidth e?ciency of m-ary FSK signals. (b) Find the output of the matched ?lter and determine the maximum value of (S/N )0 if the input s(t) is a rectangular pulse of amplitude A and duration T. [8+8]
7. (a) A DMS X has four symbols x1 , x2 , x3 , and x4 with P (x1 ) = 1/2, P (x2 ) = 1/4, and P (x3 ) = P (x4 ) = 1/8. Construct a Shannon-fano code for X, and show that this code has the optimum property that ni =I(xi ) and that the code e?ciency is 100 percent. (b) If a discrete memoryless source whose alphabet consists of K equiprobable symbols. Explain why the use of a ?xed-length code for the representation of such a source is about as e?cient as any code can be. [12+4]
8. (a) Write explaining notes on Turbo codes and BCH codes (b) Design an encoder for a (7,4) binary cyclic code generated by g(x)=1+x+x3 and verify its operation using the message vector D=0101. [8+8] ?????
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