Name of the College : Sphoorthy Engineering College
University : JNTUH
Department : INFORMATION TECHNOLOGY
Subject Name : COMMUNICATION THEORY
Degree : B.Tech
Year/Sem : III/I
Website : sphoorthyengg.com
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/sphoorthyengg.com/4729-RR311202%20-%20COMMUNICATION%20THEORY.pdf
Communication Theory Question Paper :
B. Tech III Year I Semester Examinations, December-2011
Time: 3 hours
Max. Marks: 80
Related : Sphoorthy Engineering College RR311203 Computer Graphics B.Tech Question Paper : www.pdfquestion.in/4728.html
Answer any five questions :
All questions carry equal marks :
1. a) State and prove the following properties of the Fourier transform
i) Time scaling ii) Frequency shifting
b) The Fourier transform X(f) of a signal x(t) is defined by 1,01()02,0,0fXfff>???==???<?
Determine x(t) [8+8]
2. a) Discuss any four properties of power spectral density.
b) Explain Rayleigh probability density function. [8+8]
3. a) What is random variable?
b) Explain discrete and continuous random variable.
c) Distinguish between random variable and random processes. [4+4+6]
4. a) Derive a mathematical expressions for probability distribution function and probability density function.
b) Compare SSB with VSB. [10+6]
5. a) Draw the phasor diagram of AM and NBFM and explain.
b) Discuss the bandwidth consideration in FM. [10+6]
6. a) What is quantization error? Derive an expression for quantization error.
b) State and prove the sampling theorem in time domain. [8+8]
7. a) Determine the entropy of binary memoryless source.
b) A voice-grade channel of the telephone network has a bandwidth of 3.4 KHz
i) Calculate the information capacity of the telephone channel for a signal-to- noise ratio of 30dB.
ii) Calculate the minimum signal-to-noise ratio required to support information transmission through the telephone channel at the rate of 9.6 kbps. [8+8]
8. Write short notes on:
a) Cross talk
b) Convolutional codes
c) Adaptive delta modulation. [16]
RRCode No: RR311202 SET-2
1. a) What is random variable?
b) Explain discrete and continuous random variable.
c) Distinguish between random variable and random processes. [4+4+6]
2. a) Derive a mathematical expressions for probability distribution function and probability density function.
b) Compare SSB with VSB. [10+6]
3. a) Draw the phasor diagram of AM and NBFM and explain.
b) Discuss the bandwidth consideration in FM. [10+6]
4. a) What is quantization error? Derive an expression for quantization error.
b) State and prove the sampling theorem in time domain. [8+8]
5. a) Determine the entropy of binary memoryless source.
b) A voice-grade channel of the telephone network has a bandwidth of 3.4 KHz
i) Calculate the information capacity of the telephone channel for a signal-to- noise ratio of 30dB.
ii) Calculate the minimum signal-to-noise ratio required to support information transmission through the telephone channel at the rate of 9.6 kbps. [8+8]
6. Write short notes on:
a) Cross talk
b) Convolutional codes
c) Adaptive delta modulation. [16]
7. a) State and prove the following properties of the Fourier transform
i) Time scaling ii) Frequency shifting
b) The Fourier transform X(f) of a signal x(t) is defined by 1,01()02,0,0fXfff>???==???<?
Determine x(t) [8+8]
8. a) Discuss any four properties of power spectral density.
b) Explain Rayleigh probability density function. [8+8]
RRCode No: RR311202 SET-3
1. a) Draw the phasor diagram of AM and NBFM and explain.
b) Discuss the bandwidth consideration in FM. [10+6]
2. a) What is quantization error? Derive an expression for quantization error.
b) State and prove the sampling theorem in time domain. [8+8]
3. a) Determine the entropy of binary memoryless source.
b) A voice-grade channel of the telephone network has a bandwidth of 3.4 KHz
i) Calculate the information capacity of the telephone channel for a signal-to- noise ratio of 30dB.
ii) Calculate the minimum signal-to-noise ratio required to support information transmission through the telephone channel at the rate of 9.6 kbps. [8+8]
4. Write short notes on:
a) Cross talk
b) Convolutional codes
c) Adaptive delta modulation. [16]
5. a) State and prove the following properties of the Fourier transform
i) Time scaling ii) Frequency shifting
b) The Fourier transform X(f) of a signal x(t) is defined by 1,01()02,0,0fXfff>???==???<?
Determine x(t) [8+8]
6. a) Discuss any four properties of power spectral density.
b) Explain Rayleigh probability density function. [8+8]
7. a) What is random variable?
b) Explain discrete and continuous random variable.
c) Distinguish between random variable and random processes. [4+4+6]
8. a) Derive a mathematical expressions for probability distribution function and probability density function.
b) Compare SSB with VSB. [10+6]