| Anna University Department of Electronics Communication Engineering 5th Semester Anna University, Chennai
May/ June 2013 Examinations
EC2301 Digital Communication Important Questions
1. Compare the bit error probability due to coherent ASK,PSI( and FSK systems. Compare the performance of these systems
2. Explain the generation, detection , signal space diagram, bit error probability and power spectra of QPSI
3. Draw the block diagram of DPCM scheme and explain the principles in detail
4. Explain the mathematical model of communication channel
5. Explain in detail about LPC and SBC
6. Give the block diagram for the generation and detection of BFSI( signal and give a brief explanation of the same
7. Draw a neat block diagram of a typical digital communication system and explain the function of the key signal processing blocks
8. Explain binary PSK and QPSK with corresponding equations and constellation diagrams
9. Derive the power spectra of polar codes and on-off codes. Discuss their characteristics.
10. Explain the encoder and syndrome calculator for an (n,k) cyclic code with diagram
11. Explain in detail the coding and decoding of linear block codes
12. Briefly explain the viterbi decoding algorithm with example
13. Obtain the expression for Nyquist criteria for distortionless baseband transmission for zero ISI
14. Derive the expression for bit error probability due to a matched filter
15. What does the term eualization refer to? Explain how it is carried out by using transversal filter?
16. Explain in detail about eye pattern analysis
17. Explain in detail about generation and detection of QPSK signal with block diagram and waveform
18. Derive the error probability for non-coherent detection of ASK system
19. Draw a neat block diagram of a typical digital communication system and explain the function of the key signal processing blocks
20. Explain spectral waveform encoding process  | 
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