B.E/B.Tech DEGREE EXAMINATION,APRIL/MAY 2010
Sixth Semester
Electronics and Communication Engineering
EC 1351 –DIGITAL COMMUNICATION
(Regulation 2004)
(Common to B.E(Part-Time) Fifth Semester Regulation 2005)
Time:3 hours Maximum:100 marks
Answer ALL questions.
PART A-(10 * 2=20 marks)
1. What are the two types of quantization error that occur in delta modulation?
2. Sate the advantage of adaptive delta modulation over delta modulation?
3. What is meant by correlative level coding?
4. Define error probability.
5. Differentiate base band transmission from pass band transmission.
6. Define MSK.
7. Define Hamming weight and Minimum Hamming distance.
8. What is the function of interleaver?
9. Define Gold Theorem.
10. Write down the expression for jamming margin.
PART-B(5 *16=80 marks)
11. (a)(i) Explain the working of differential PCM and hence derive the expression for
signal to noise ratio. (12 marks)
(ii) Write a note on multiplexing.(4 marks)
(or)
(b)(i) Explain the non-uniform quantization.(6 marks)
(ii) Explain the operation of PCM and Delta modulation systems.(10 marks)
12. (a)(i) Explain in detail M-ary base band system.(10 marks)
(ii) Write briefly about eye patterns.(6 marks)
(or)
(b)(i) Obtain the expression for Nyquist criteria for distortionless base band
transmission for zero ISI .
(ii) Explain about adaptive equalization.(6 marks)
13. (a)(i) Derive the expression for probability of error of BPSK and QAM systems.
(16 marks)
(or)
(b)(i) Explain the working of DPSK scheme. With the help of suitable circuit (6 marks)
(ii) Explain carrier and symbol synchronization.(10 marks)
14. (a)(i) Discuss the encoding turbo codes and their performance.(8 marks)
(ii) Draw the state diagram of ½ rate convolution code shown below:
(or)
(b)(i) With an example show how viterbi algorithm is used for decoding convolutional
codes.(10 marks)
(ii) Write short notes on: Cyclic Redundancy Check codes.( 6 marks)
15.(a)(i) Explain the frequency –hop spread spectrum technique in detail.(10 marks)
(ii) Explain the properties of PN sequence.(6 marks)
(or)
(b)(i) Derive the expression for probability of error of direct sequence spread BPSK
system.
(10 marks)
(ii) Write about the maximal length and gold codes.(6 marks).
KEYWORDS:2010 ANNA UNIVERSITY CHENNAI B.E COMMUNICATION ENGINEERING ANNA UNIVERSITY B.E/B.TECH DEGREE EC-1351 DIGITAL COMMUNICATION (E.C.E ) 6TH SEMESTER -2010,ANNA UNIVERSITY QUESTION PAPER,ANNA UNIVERSITY,ANNA UNIVERSITY CHENNAI,ANNA UNIVERSITY COIMBATORE,ANNA UNIVERSITY TRICHY,ANNA UNIVERSITY TIRUNELVELI,ANNA UNIVERSITY MADURAI,ANNA UNIVERSITY SYLLABUS,ANNA-UNIVERSITY RESULTS,ANNA UNIVERSITY DISTANCE EDUCATION,ANNA UNIVERSITY MBA-CENTRE FOR DISTANCE EDUCATION,ANNA UNIVERSITY SCHEDULE OF EXAMINATIONS,ANNA UNIVERSITY ADMISSION,ANNA UNIVERSITY COURSES,ANNA UNIVERSITY ACADEMIC,ANNA UNIVERSITY DEPARTMENTS,ANNA UNIVERSITY RESEARCH,ANNA UNIVERSITY MAIL,ANNA UNIVERSITY QUESTION PAPERS,ANNA UNIVERSITY COUNSELLING DATES,ANNA UNIVERSITY RE-EVALUATION RESULTS
Sixth Semester
Electronics and Communication Engineering
EC 1351 –DIGITAL COMMUNICATION
(Regulation 2004)
(Common to B.E(Part-Time) Fifth Semester Regulation 2005)
Time:3 hours Maximum:100 marks
Answer ALL questions.
PART A-(10 * 2=20 marks)
1. What are the two types of quantization error that occur in delta modulation?
2. Sate the advantage of adaptive delta modulation over delta modulation?
3. What is meant by correlative level coding?
4. Define error probability.
5. Differentiate base band transmission from pass band transmission.
6. Define MSK.
7. Define Hamming weight and Minimum Hamming distance.
8. What is the function of interleaver?
9. Define Gold Theorem.
10. Write down the expression for jamming margin.
PART-B(5 *16=80 marks)
11. (a)(i) Explain the working of differential PCM and hence derive the expression for
signal to noise ratio. (12 marks)
(ii) Write a note on multiplexing.(4 marks)
(or)
(b)(i) Explain the non-uniform quantization.(6 marks)
(ii) Explain the operation of PCM and Delta modulation systems.(10 marks)
12. (a)(i) Explain in detail M-ary base band system.(10 marks)
(ii) Write briefly about eye patterns.(6 marks)
(or)
(b)(i) Obtain the expression for Nyquist criteria for distortionless base band
transmission for zero ISI .
(ii) Explain about adaptive equalization.(6 marks)
13. (a)(i) Derive the expression for probability of error of BPSK and QAM systems.
(16 marks)
(or)
(b)(i) Explain the working of DPSK scheme. With the help of suitable circuit (6 marks)
(ii) Explain carrier and symbol synchronization.(10 marks)
14. (a)(i) Discuss the encoding turbo codes and their performance.(8 marks)
(ii) Draw the state diagram of ½ rate convolution code shown below:
(or)
(b)(i) With an example show how viterbi algorithm is used for decoding convolutional
codes.(10 marks)
(ii) Write short notes on: Cyclic Redundancy Check codes.( 6 marks)
15.(a)(i) Explain the frequency –hop spread spectrum technique in detail.(10 marks)
(ii) Explain the properties of PN sequence.(6 marks)
(or)
(b)(i) Derive the expression for probability of error of direct sequence spread BPSK
system.
(10 marks)
(ii) Write about the maximal length and gold codes.(6 marks).
KEYWORDS:2010 ANNA UNIVERSITY CHENNAI B.E COMMUNICATION ENGINEERING ANNA UNIVERSITY B.E/B.TECH DEGREE EC-1351 DIGITAL COMMUNICATION (E.C.E ) 6TH SEMESTER -2010,ANNA UNIVERSITY QUESTION PAPER,ANNA UNIVERSITY,ANNA UNIVERSITY CHENNAI,ANNA UNIVERSITY COIMBATORE,ANNA UNIVERSITY TRICHY,ANNA UNIVERSITY TIRUNELVELI,ANNA UNIVERSITY MADURAI,ANNA UNIVERSITY SYLLABUS,ANNA-UNIVERSITY RESULTS,ANNA UNIVERSITY DISTANCE EDUCATION,ANNA UNIVERSITY MBA-CENTRE FOR DISTANCE EDUCATION,ANNA UNIVERSITY SCHEDULE OF EXAMINATIONS,ANNA UNIVERSITY ADMISSION,ANNA UNIVERSITY COURSES,ANNA UNIVERSITY ACADEMIC,ANNA UNIVERSITY DEPARTMENTS,ANNA UNIVERSITY RESEARCH,ANNA UNIVERSITY MAIL,ANNA UNIVERSITY QUESTION PAPERS,ANNA UNIVERSITY COUNSELLING DATES,ANNA UNIVERSITY RE-EVALUATION RESULTS