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SYLLABUS

EC2302 DIGITAL SIGNAL PROCESSING L T P C 3 1 0 4

UNIT I DISCRETE FOURIER TRANSFORM 9DFT and its properties, Relation between DTFT and DFT, FFT computations using Decimation in time and Decimation in frequency algorithms, Overlap-add and save methodsUNIT II INFINITE IMPULSE RESPONSE DIGITAL FILTERS: 9Review of design of analogue Butterworth and Chebyshev Filters, Frequency transformation in analogue domain – Design of IIR digital filters using impulse invariance technique – Design of digital filters using bilinear transform – pre warping – Realization using direct, cascade and parallel forms.UNIT III FINITE IMPULSE RESPONSE DIGITAL FILTERS 9Symmetric and Antisymmetric FIR filters – Linear phase FIR filters – Design using Hamming, Hanning and Blackmann Windows – Frequency sampling method – Realization of FIR filters – Transversal, Linear phase and Polyphase structures.UNIT IV FINITE WORD LENGTH EFFECTS 9Fixed point and floating point number representations – Comparison – Truncation and Rounding errors - Quantization noise – derivation for quantization noise power – coefficient quantization error – Product quantization error - Overflow error – Roundoff noise power - limit cycle oscillations due to product roundoff and overflow errors - signal scalingUNIT V MULTIRATE SIGNAL PROCESSING 9Introduction to Multirate signal processing-Decimation-Interpolation-Polyphase implementation of FIR filters for interpolator and decimator -Multistage implementation of sampling rate conversion- Design of narrow band filters - Applications of Multirate signal processing.

L: 45, T: 15, TOTAL= 60 PERIODS

TEXT BOOKS1. John G Proakis and Manolakis, “ Digital Signal Processing Principles, Algorithms and Applications”, Pearson, Fourth Edition, 2007.2. S.Salivahanan, A. Vallavaraj, C. Gnanapriya, Digital Signal

Processing, TMH/McGraw Hill International, 2007.REFERENCES1. E.C. Ifeachor and B.W. Jervis, “ Digital signal processing – A practicalapproach”,Second edition, Pearson, 2002.2. S.K. Mitra, Digital Signal Processing, A Computer Based approach, TataMc GrawHill, 1998.3. P.P.Vaidyanathan, Multirate Systems & Filter Banks, Prentice Hall, Englewood cliffs, NJ, 1993.4. Johny R. Johnson, Introduction to Digital Signal Processing, PHI, 2006.

SYLLABUS





CS2204 ANALOG AND DIGITAL COMMUNICATION 3 1 0 4

UNIT I FUNDAMENTAL OF ANALOG COMMUNICATION 9Principles of amplitude modulation, AM envelope, frequency spectrum and bandwidth,modulation index and percent modulation, AM Voltage distribution, AM power distribution, Angle modulation - FM and PM waveforms, phase deviation and modulation index, frequency deviation and percent modulation, Frequency analysis of angle modulated waves. Bandwidth requirements for Angle modulated waves.UNIT II DIGITAL COMMUNICATION 9Introduction, Shannon limit for information capacity, digital amplitude modulation, frequency shift keying, FSK bit rate and baud, FSK transmitter, BW consideration of FSK, FSK receiver, phase shift keying – binary phase shift keying – QPSK, Quadrature Amplitude modulation, bandwidth efficiency, carrier recovery – squaring loop, Costas loop, DPSK.

UNIT III DIGITAL TRANSMISSION 9Introduction, Pulse modulation, PCM – PCM sampling, sampling rate, signal to quantization noise rate, companding – analog and digital – percentage error, delta modulation, adaptive delta modulation, differential pulse code modulation, pulse transmission – Intersymbol interference, eye patterns.UNIT IV DATA COMMUNICATIONS 9Introduction, History of Data communications, Standards Organizations for data communication, data communication circuits, data communication codes, Error control, Error Detection, Error correction, Data communication Hardware, serial and parallel interfaces, data modems, Asynchronous modem, Synchronous modem, Asynchronous modem, Synchronous modem.

UNIT V SPREAD SPECTRUM AND MULTIPLE ACCESS TECHNIQUES 9Introduction, Pseudo-noise sequence, DS spread spectrum with coherent binary PSK, processing gain, FH spread spectrum, multiple access techniques – wireless communication, TDMA and CDMA in wireless communication systems, source coding of speech for wireless communications.

TOTAL: 60 PERIODSTEXT BOOKS:1. Wayne Tomasi, “Advanced Electronic Communication Systems”, 6/e, PearsonEducation, 2007.2. Simon Haykin, “Communication Systems”, 4th Edition, John Wiley & Sons. 2001.

REFERENCES:1. H.Taub,D L Schilling ,G Saha ,”Principles of Communication”3/e,2007.2. B.P.Lathi,”Modern Analog And Digital Communication systems”, 3/e, OxfordUniversity Press, 20073. Blake, “Electronic Communication Systems”, Thomson Delmar Publications, 2002.4. Martin S.Roden, “Analog and Digital Communication System”, 3rd Edition, PHI, 2002.5. B.Sklar,”Digital Communication Fundamentals and Applications”2/e PearsonEducation 2007.

LESSON PLAN





NAME : M.MAGESHBABU DEPT : ECE SEM/SEC/DEPT : V/A /ECE SUB CODE/ NAME : EC2302 / DIGITAL SIGNAL PROCESSING

S.NO. TOPICS HR DATE CUM.HR

UNIT-11. Introduction to DSP, DFT and its properties 3 2-7-122. DFT and its properties 7 3-7-123. Relation between DTFT and DFT 2 5-7-12

4.FFT computations usingDecimation in time 4

5-7-12

5. TUTORIAL 5 6-7-12

6.FFT computations usingDecimation in time 4

2-7-12

7.FFT computations usingDecimation in frequency algorithms 5

7-7-12

8.FFT computations usingDecimation in frequency algorithms 8

7-7-12

9. TUTORIAL 3 9-7-1210. Overlap-add method 7 10-7-1211. Overlap save method 2 12-7-1212. TUTORIAL 4 12-7-12 12

UNIT-II13. Review of design of analogue Butterworth and Filters 5 13-7-1214. Review of design of analogue Chebyshev Filters 4 14-7-12

15.Frequencytransformation in analogue domain 8

14-7-12

16. TUTORIAL 3 16-7-12

17.Design of IIR digital filters using impulse invariance technique 7

17-7-12

18.Design of IIR digital filters using impulse invariance technique 2

19-7-12

19. Design of digital filters using bilinear transform 4 19-7-1220. TUTORIAL 5 20-7-12

21.Design of digital filters using bilinear transform 4

21-7-12

22. pre warping, Realization using direct 8 21-7-1223. TUTORIAL 3 23-7-1224. Cascade form Realization using parallel forms. 7 24-7-1225. Cascade form Realization using parallel forms. 2 25-7-12





26. Cascade form Realization using parallel forms. 4 26-7-12 26UNIT-III

27. Symmetric and Antisymmetric FIR filters 5 27-7-1228. Linear phase FIR filters 4 28-7-1229. Design using Hamming windows 8 28-7-1230. TUTORIAL 3 30-7-1231. Design using Hanning windows 7 31-7-1232. Design using Blackmann windows 2 2-8-1233. Frequency sampling method 4 2-8-1234. TUTORIAL 5 3-8-1235. Realization of FIR filters – Transversal 4 4-8-1236. Realization of Linear phase and Polyphase structures 8 4-8-1237. TUTORIAL 3 6-8-12 37

UNIT-IV

38.Fixed point and floating point number representations, Its Comparison 7

7-8-12

39. Truncation and Rounding errors 2 9-8-12

40.Quantization noise – derivation for quantization noise power 4

9-8-12

41. TUTORIAL 5 10-8-12

42.coefficient quantization error – Product quantization error 4

11-8-12

43. Overflow error – Roundoff noise power 8 11-8-1244. limit cycle oscillations due to product roundoff 3 13-8-1245. TUTORIAL 7 14-8-1246. limit cycle oscillations due to overflow errors 2 16-8-1247. Signal scaling 4 16-8-1248. Signal scaling 5 17-8-12

49. TUTORIAL 4 18-8-12 49

UNIT-V50. Introduction to Multirate signal processing 8 18-8-12

51. Decimation-Interpolation 7 21-8-12

51Polyphaseimplementation of FIR filters for interpolator 2

21-8-12

52 TUTORIAL 4 23-8-12

53Polyphaseimplementation of FIR filters for decimator 5

24-8-12

54Multistage implementation ofsampling rate conversion 4

25-8-12

55 Design of narrow band filters 8 25-8-12

56 TUTORIAL 3 27-8-12

57 Design of narrow band filters 7 28-8-12





58 Applications of Multirate signal processing. 2 30-8-12

59 Applications of Multirate signal processing. 4 30-8-12

60 TUTORIAL 5 30-8-12 60

LESSON PLAN





NAME : M.MAGESHBABU DEPT : ECE SEM/SEC/DEPT : III/C /CSE SUB CODE/ NAME : EC2204 / ANALOG AND DIGITAL COMMUNICATION

S.NO. TOPICS HR DATE CUM.HR

UNIT-11. Principles of amplitude modulation 5 2-7-12

2.AM envelope, frequency spectrum and bandwidth 2

3-7-12

3. modulation index and percent modulation 4 4-7-12

4.AM Voltage distribution, AM power distribution 8

4-7-12

5. TUTORIAL 7 5-7-126. Angle modulation - FM and PM waveforms 6 7-7-12

7. phase deviation and modulation index 5 9-7-12

8. frequency deviation and percent modulation 2 10-7-129. TUTORIAL 4 11-7-1210. Frequency analysis of angle modulated waves 8 11-7-12

11.Bandwidth requirements for Angle modulated waves 7

12-7-12

12. TUTORIAL 6 14-7-12UNIT-II

13.Introduction, Shannon limit for information capacity 5

16-7-12

14. digital amplitude modulation 2 17-7-12

15. frequency shift keying 4 18-7-1216. TUTORIAL 8 19-7-1217. FSK bit rate and baud, FSK transmitter 7 23-7-12

18. BW consideration of FSK 5 19-7-1219. Design of digital filters using bilinear transform 2 24-7-1220. TUTORIAL 4 25-7-12

21.FSK receiver phase shift keying – binary phase shift keying 8

25-7-12

22.QPSK, Quadrature Amplitude modulation bandwidth efficiency 7

26-7-12

23. TUTORIAL 6 28-7-12

24.carrier recovery – squaring loop, Costas loop, DPSK. 5

30-7-12 24

UNIT-III





25. Introduction, Pulse modulation 2 31-7-12

26. PCM – PCM sampling 4 1-8-1227. sampling rate, signal to quantization noise rate 8 1-8-1228. TUTORIAL 7 2-8-1229. companding – analog and digital 6 4-8-1230. percentage error, delta modulation 5 6-8-1231. adaptive delta modulation 2 7-8-1232. TUTORIAL 4 8-8-1233. differential pulse code modulation 8 8-8-12

34. pulse transmission 7 9-8-12

35. Intersymbol interference eye patterns 6 11-8-1236. TUTORIAL 5 13-8-12

UNIT-IV37. Introduction, History of Data communications 238. Standards Organizations for data communication 4 14-8-12

39.data communication circuits, data communication codes 5

15-8-12

40. TUTORIAL 7 15-8-12

41. Error control, Error Detection 6 16-8-12

42. Error correction 4 18-8-12

43.Data communication Hardware, serial and parallel interfaces 8

22-8-12

44. TUTORIAL 7 22-8-1245. data modems 6 23-8-12

46. Asynchronous modem, Synchronous modem 5 25-8-12

47. Asynchronous modem, Synchronous modem 4 27-8-12

48. TUTORIAL 8 29-8-12 48

UNIT-V49. Introduction, Pseudo-noise sequence 7 29-8-12

50. DS spread spectrum with coherent binary PSK 6 30-8-12

51 processing gain, FH spread spectrum 5 1-9-12

52 TUTORIAL 2 3-9-12

53 multiple access techniques 4 4-9-12

54 multiple access techniques 8 5-9-12

55 wireless communication 7 5-9-12

56 TUTORIAL 6 6-9-12

57 wireless communication 5 8-9-12

58TDMA and CDMA in wireless communication systems 2

10-9-12





59TDMA and CDMA in wireless communication systems 4

11-9-12

60source coding of speech for wireless communications. 5

12-9-12

61source coding of speech for wireless communications. 7

12-9-12

62 TUTORIAL 6 13-9-12 62

TIME TABLE

HR 1 2 3 4 5 6 7 8





MONDAY DSP

TUESDAYDSP

WEDNESDAY

THURSDAYDSP DSP

FRIDAYDSP DSP

TIME TABLE

HR 1 2 3 4 5 6 7 8





MONDAY ADC

TUESDAYADC

WEDNESDAYADC ADC

THURSDAY

ADC

FRIDAYADC

B.E/B.Tech. DEGREE EXAMINATION, APRIL/MAY 2010Third Semester

Computer Science and EngineeringCS2204 - ANALOG AND DIGITAL COMMUNICATION

(Regulation 2008)Time: Three hours Maximum: 100 Marks





Answer ALL QuestionsPART A- (10 x 2 = 20 Marks)

1. In a Amplitude modulation system, the carrier frequency is Fc= 100KHz. The maximum frequency of the signal is 5 KHz. Determine the lower and upper side bonds and the bond width of AM signal.2. The maximum frequency deviation in an FM is 10 KHz and signal frequency is 10 KHz. Find out the bandwidth using Carson's rule and the modulation index.3. Draw the ASK and FSK signals for the binary signal s(t)= 1011001.4. What are the advantages of QPSK?5. Define Nyquist sampling theorem.6. For the signal m(t)= 3 cos 500^t + 4 sin 1000^t, Determine the Nyquist sampling rate.7. What is meant by ASCII code?8. Which error detection technique is simple and which one is more reliable?9. What are the applications of spread spectrum modulation?10. Design processing gain in spread spectrum modulation.

PART B- (5 x 16 = 80 Marks)

11. (a) (i) Distinguish between FM and PM by giving its mathematical analysis. (8 Marks)(ii) Derive the relationship between the voltage amplitudes of the side band frequencies and the carrier and draw the frequency spectrum. (8 Marks)(Or)(b) (i) Discuss about the sets of side bands produced when a carrier is frequency modulated by a single frequency sinusoid. (8 Marks)(ii) In an AM modulator, 500 KHz carrier of amplitude 20 V is modulated by 10 KHz modulating signal which causes a change in the output wave of +_ 7.5 V. Determine:(1) Upper and lower side band frequencies(2) Modulation Index(3) Peak amplitude of upper and lower side frequency(4) Maximum and minimum amplitudes of envelope. (8 Marks)

12. (a) What is known as Binary phase shift keying? Discuss in detail the BPSK transmitter and Receiver and also obtain the minimum double sided Nyquist bandwidth. (16 Marks)(Or)(b) (i) Illustrate the concept of 8 QAM transmitter with the truth table. (8 Marks)(ii) What is the need for carrier Recovery? Explain the Costas loop method of carrier recovery. (8 Marks)

13. (a) (i) What is called companding? Briefly discuss the Analog companding. (8 Marks)(ii) Discuss about the causes of ISI. (8 Marks)(Or)(b) (i) Explain in detail the Delta modulation transmitter and Receiver. (10 Marks)(ii) Discuss the draw backs of delta modulation and explain the significance of adaptive delta modulator. (6 Marks)

14. (a) (i) Describe the most common error detection techniques. (12 Marks)(ii) Discuss the function of a data modem. (4 Marks)





(Or)(b) (i) Explain in detail the characteristics of IEEE 488 Bus. (10 Marks)(ii) Briefly explain the three methods of error connection. (6 Marks)

15. (a) (i) What is a Pseudo noise sequence? What are the properties of Pseudo noise sequence? (8 Marks)(ii) Describe the application of CDMA in wireless communication system. (8 Marks)(Or)(b) (i) With a block diagram explain, DS spread spectrum with coherent binary PSK. (10 Marks)(ii) Explain the near- far problem in spread spectrum modulation? (6 Marks)

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2011.Third Semester

Computer Science and EngineeringCS 2204 — ANALOG AND DIGITAL COMMUNICATION

(Regulation 2008)Time : Three hours Maximum : 100 marks





Answer ALL questions.

PART A — (10 × 2 = 20 marks)1. Define Amplitude modulation.2. What is modulation index and percentage modulation in AM?3. What is Shannon limit for information capacity?4. What is binary phase shift keying?5. What is the need for sampling?6. Define inter symbol interference (ISI).7. List any two data communication standard organization.8. What is a data modem?9. List the spread spectrum techniques.10. What is CDMA?

PART B — (5 × 16 = 80 marks)11. (a) (i) Explain the principles of amplitude modulation. (8)(ii) Write a note on frequency spectrum analysis of angle modulated waves. (8)

Or(b) (i) Explain the band width requirements of anogle modulated waves. (8)(ii) Compare FM and PM. (8)12. (a) (i) Discuss the principle of operation of FSK transmitter. (8)(ii) Write a note on QPSK. (8)

Or(b) (i) Discuss the principle of operation of FSK receiver. (8)(ii) Write a note on DPSK. (8)13. (a) (i) Describe the basic principles of PCM system. (8)(ii) What is companding? Explain in detail. (8)

Or(b) (i) Describe in detail the adaptive delta modulation system. (8)(ii) What is signal to quantitation noise? Explain. (8)14. (a) (i) Write a note on data communication codes. (8)(ii) Explain serial and parallel interfaces in detail. (8)

Or(b) (i) Explain in detail about error detection and correction. (8)(ii) Write a note on medium and high speed modem. (8)15. (a) (i) Explain the principle of DS spread spectrum technique. (8)(ii) Explain the salient features of wireless communication. (8)

Or(b) (i) Describe the frequency hopping spread spectrum technique in detail. (8)(ii) Explain the basic principle of TDMA. (8)

B.E/B.Tech EXAMINATIONS,NOVEMBER/DECEMBER 2009THIRD SEMESTER

COMPUTER SCIENCE AND ENGINEERING





CS36-ANALOG AND DIGITAL COMMUNICATIONS(REGULATIONS 2008)

PART A-(10X2=20 marks)1.A carrier wave is represented by equation s(t)=12sinwt.Draw the wave form of an AM wave for depth of modulation of 0.5.2.Compare FM with AM3.What is coherent detection?4.Why is binary ASK called on-off keying?5.What are the errors in DM?6.Define companding7. What are the two methods of error detection and correction?8.What do you mean by signaling rate?9.Define processing gain10.What is CDMA? PART B-(5X16=80 marks)

11.(a)(i)The output voltage of a transmitter is given by 500(1+0.4sin3140t)cos6.28X10^7t This voltage is fed to a load of 600 ohms.Determine 1.Carrier frequency 2.Modulating frequency 3.Carrier power (9)(ii)Explain i detail about super heterodyne receiver(7) Or(b)(i)Carrier frequency modulated with a sinusoidal signal of 2kHz resulting in a maximum frequency deviation of 5kHz.Find 1.Modulating index 2.Bandwidth of modulated signal (4)(ii)Explain the method of generating FM signal using indirect method(12)

12.(a)(i)Explain the coherent binary FSK system with a neat diagram of transmitter and receiver(12) (ii)Enumerate the advantages and disadvantages of FSK over PSK system(4) Or(b)(i)Explain the generation and detection of coherent QPSK system in detail(12) (ii)What is DPSK?Explain its bandwidth requirements.

13.(a)(i)Explain in detail about DPCM with suitable diagram(10) (ii)1kHz signal is sampled by 8kHz sampling signal and the samples are encoded with 12 bit PCM system.Find 1.Required bandwidth for PCM system 2.Total number of bits in the digital output signal in 10 cycles(6) Or(b)(i)Write short notes on ISI(6) (ii)What is eye pattern?Explain how is the performance of a base-band pulse transmission system measured with this?(10)





14(a)(i)Write short notes on error correcting codes (ii)Find the generator polynomial of (7,4) cyclic code and find the codeword for the message 1001(12) Or(b)Explain in detail about the serial interface with its control signals and timing information(16)15(a)(i)What are pseudo noise sequences?How are they generated?(6) (ii)Explain direct sequence spread spectrum system in detail(10) Or (b)(i)Explain 2 types of FH spread spectrum systems with suitable diagrams(16)

QUESTION BANKUNIT -I

PART- A





1. As related to AM, what is over modulation, under modulation and 100% modulation?2. Define modulation index of an AM signal3. A transmitter radiates 9 kW without modulation and 10.125 kW after modulation. Determine depth

of modulation.4. Define the transmission efficiency of AM signal.5. Draw the phasor diagram of AM signal.6. Advantages of SSB.7. Disadvantages of DSB-FC.8. What are the advantages of superhetrodyne receiver?9. Distinguish between low level and high level modulator.10. Give the parameters of receiver.11. Define sensitivity and selectivity.12. Define fidelity.13. What is meant by image frequency?14. Need for modulation.15. Application of AM.16. What is meant by diagonal clipping and negative peak clipping?17. Define envelope.18. Distinguish between linear and non linear modulator.19. What are the limitations of AM20. Draw the envelope of AM

PART- B 1.(i) What is the principle of Amplitude modulation? Derive expression for the AM wave and draw its spectrum. (8)(ii) Describe the frequency analysis of Angle modulated waves. Explain their Bandwidth requirements. (8)2) (i) A modulating signal of 2 cos5000t is amplitude modulated over a carrier signal of 5cos20000t . Derive expressions for the modulation index, LSB and VSB frequencies, Bandwidth and the ratio of Side Band Power in the Total Power of AM wave. (8)(ii) Explain the principle of Angle Modulation. Derive and explain phase deviation, Modulation index, frequency deviation and percent modulation. (8)3) (i) Write short notes on :(1) AM voltage distribution. (4)(2) AM power distribution. (4)(ii) An audio frequency signal 10 sin 2*3.14* 500t is used to amplitude modulate a carrier of 50 sin 5*3.14*10^5 t. Calculate(1) Modulation index (2)(2) Side band frequencies (2)(3) BW required (2)(4) Total power delivered to the load of 600 _. (2)4) (i) Compare FM and AM. (12)





(ii) The phase deviation constant in a phase modulation system is K = 0.01 rad/v. Calculate the maximum phase deviation when a modulating signal of 10 V is applied? (4)5) In angle modulation, explain frequency deviation, percent modulation, phase deviation and modulation index with suitable example.6) (i) Derive the expression for a Amplitude Modulated wave and draw its spectrum. (10)(ii) Obtain a relationship between carrier and side band powers in an AM DSBFC wave and explain how power distribution takes place in AM DSB FC system. (6)7) (i) Define modulation index for FM and PM and obtain the relation between modulation index and modulating signal for FM and PM.(ii) Compare the advantages and disadvantages of angle modulation with amplitude modulation.8) (i) Distinguish between FM and PM by giving its mathematical analysis. (8)(ii) Derive the relationship between the voltage amplitudes of the side band frequencies and the carrier and draw the frequency spectrum. (8)

UNIT - IIPART – A

1. Differentiate coherent and non coherent digital modulation methods2. What is correlative coding?3. Compare bandwidth of Mary PSK signal And Mary FSK signal





4. Sketch the waveform of PSK for binary sequence 1100101.5. Differentiate QPSK and BPSK.6. Differentiate ASK and FSK.7. What are the type of digital data format.8. Define minimum Shift keying.9. Define Duobinary encoding10.Define DPSK.11 What are the advantages of QPSK?12 Define Nyquist sampling theorem.13 Define information capacity and bit rate.14. Draw PWM and PPM waveforms.15. What is the relation between bit rate and baud for a FSK system?16. What are the advantages of digital transmission?17. Define ASK, PSK and FSK.18. What is meant by antipodal signal and give one example?19. Why is ASK called as ON-OFF keying?20. What are the differences between QASK and QPSK?

PART – B 1. (i) Draw FSK Transmitter and explain. Describe its Bandwidth Considerations. (8)(ii) For a BPSK modulator with a Carrier frequency of 70 MHz and an input bit rate of 10 Mbps, determine the maximum and minimum upper and lower side frequencies, draw the output spectrum, determine the minimum Nyquist bandwidth, and calculate the baud (Assume f= 5MHz)2) (i) Draw and explain the operations of Non-coherent and coherent FSK modulators. (8)(ii) Draw QPSK modulator and explain. Describe its Bandwidth considerations. (8)3) (i) Explain the principle of FSK transmitter and receiver. (10)(ii) Write short notes on the spectrum and bandwidth of FSK. (6)4) (i) Compare the various types of digital modulation techniques. (8)(ii) Explain the eyepattern in base band digital transmission with a neat diagram. (8)5) Describe FSK transmitter and FSK receiver.6) Explain in detail carrier recovery with a suitable block diagram.7) (i) Describe with neat diagram, the operation of a QPSK modulator. Draw its phasor and constellation diagram. (10)(ii) Explain the bandwidth considerations of QPSK system. (6)8) What is carrier recovery? Discuss how carrier recovery is achieved by the squaring loop and Costas loop circuits. (16)

UNIT IIIPART – A

1. State sampling theorem.2. What is aliasing?3. How to avoid aliasing effect.4. Define eye pattern.





5. Define PAM.6. Construct NRZ and RZ format for 011010.7. Define adaptive equalization.8.Define ISI.9.Define Nyquist Criteria.10.What is the interpretation obtained from eye pattern?11. Define Nyquist sampling theorem.12. For the signal m (t) = 3 cos 500 *3.14t + 4 sin 1000*3.14 t , Determine the Nyquist sampling rate.13. Draw PWM and PPM waveforms.14. Draw the Eye pattern and indicate how ISI is measured from it.15. What are the advantages of digital transmission?16. Define companding.17. Define dynamic range.18. Determine the Nyquist sample rate for a maximum analog input frequency of(a) 4 KHz(b) 10 KHz.19. Distinguish between DM and ADM.

PART –B 1. State and prove Sampling theorem.2. Explain various data formats with clear example.3. What is eye pattern. What are the interpretations obtained from it?4. Write notes on Intersymbol Interference.5. Explain in detail the Nyquist criterion for distortionless transmission of baseband PAM signal6. Write notes on adaptive equalization.7. (i) Describe in detail the PCM technique with focus on its sampling rate, and signal to quantization Noise ratio. (8)(ii) What is ISI? Explain the applications of eye pattern to detect ISI. (8)8. (i) With a block diagram, explain the adaptive Delta Modulation technique. (8)(ii) What is DPCM? Explain its principle with neat block diagram. (8)9. (i) Explain the elements of PCM system with a neat block diagram. (12)(ii) What is companding? (4)10 (i) Find the signal amplitude for minimum quantization error in a delta modulation system if step size is 1 volt having repetition period 1 ms. The information signal operates at 100 Hz. (ii) Describe the operation of DPCM system with a relevant diagram.(12)

UNIT VPART – A

1. Define pseudo noise sequence.2. Define spread spectrum technique3. Differentiate Slow and fast FH SS technique.4. Differentiate TDMA and FDMA.5. Define processing gain for DS SS technique6. What are the advantages of Spread Spectrum techniques?





7. Differentiate DS –SS and FH-SS.8. Define processing gain for FH SS technique9. What are the disadvantages of DS SS techniques?10. What are the advantages of FH SS techniques?11. What are the applications of spread spectrum modulation?12. Design processing gain in spread spectrum modulation.13. Define effective jamming power and processing.14. What is the principle of frequency hopping spread spectrum?15. A spread spectrum communication system has the following parameters information bit duration Tb = 4.095 ms, PN chip duration Tc = 1 ms. Determine Processing Gain.16. What is meant by slow frequency hopping and fast-frequency hopping?17. What is frequency hopping?18. What is meant by an orthogonal code?19. Define Pseudonoise sequence?20. What are the different types of multiple access techniques?21. What is the significance of PN sequence?22. What are the types of FH spread spectrum technique?

PART –B 1. Explain in detail the transmitter and receiver of DS SS technique.2. Explain in detail the transmitter and receiver of FH SS technique.3. Explain in detail the characteristics of PN sequence4. Explain the two common multiple access technique for wireless communication.5. Differentiate direct sequence and frequency hop spread spectrum technique6. Compare and contrast TDMA and CDMA techniques.7. (i) Draw the circuit of a P-N sequence generator and explain. (8)(ii) Describe the concept of FHSS in detail. (8)8. (i) Explain the principle of DSSS with coherent binary PSK. (8)(ii) Compare between the TDMA and CDMA wireless communication systems.9. (i) Write a short note on frequency hop spread spectrum. (10)(ii) Explain the applications of spread spectrum techniques. (6)10. (i) Give a detail account of the different types of multiple access techniques. (10)(ii) Compare TDMA and CDMA. (6)

EC 2302 DIGITAL SIGNAL PROCESSING(Regulation 2008)

Time : Three hours Maximum : 100 MarksAnswer ALL questions

PART A (10 2 = 20 Marks)

1.State the advantages of FFT over DFTs.2.What is mean by bit reversal?3.Why do we go for analog approximation to deisgn a digital filter?





4.Give any two properties of chebyshev filters.5.State the properties of FIR filters.6.What is mean by Gibbs phenomenon?7.What is mean by fixed point arithmetic?Give example.8.Explain the meaning of limit cycle oscillator.9.State the various applications of DSP.10.What is echo cancellation?

PART B (5 16 = 80 Marks)11(a)With appropriate diagrams describe (i)overlap-save method,(ii)overlap-add method.

or(b)Explain Radix-2 DIF-FFT algorithm.Compare it with DIT-FFT algorithms.12(a)Explain in detail Butterworth filter approximation.

or(b)Expalin the bilinear transform method of IR filter design.What is warping effect?Explain the poles and zeros mapping procedure clearly.13(a)Realize the system function H(z)=(2/3)z+1+(2/3)z(to the power -1) by linear phase FIR structure.

or(b)Explain the designing of FIR filters using windows.14(a)Explain the quantization process and errors introduced due to quantisation.

or(b)(i)Explain how reduction of product round-off error is achieved in digital filters.(ii)Explain the effects of coefficient quantisation in FIR filters.15(a)(i)Explain how various sound effects can be generated with the help of DSP.(ii)State the applications of multirate signal processing.

or

(b)(i)Expalin how DSP can be used for speech processing.(ii)Explain in detail about decimation and interpolation.

NAME LIST

S.NO CLASS Reg No NameofStudent Sex H / D

1 V ECE A 51210106001 ABIRAMI T F D

2 V ECE A 51210106002 ALOCK KUMAR DAKUYA M H

3 V ECE A 51210106003 AMAN. S M H





4 V ECE A 51210106004 AMARA VENKATA LAKSHMI MOUNICA F H

5 V ECE A 51210106005 AMBALAKARA TARUN TEJA M H

6 V ECE A 51210106006 ANANDHI. V F H

7 V ECE A 51210106007 ANANTHI. V F D

8 V ECE A 51210106008 ANBARASAN. C M D

9 V ECE A 51210106009 ANBUSELVAM. D M H

10 V ECE A 51210106010 ARAVIND. T M H

11 V ECE A 51210106011 ARIVAZHAGAN. M M D

12 V ECE A 51210106013 ARTHI. K F D

13 V ECE A 51210106014 ASHA PRIYADHARSINI. R F H

14 V ECE A 51210106015 BHARATHIDASAN. S M H

15 V ECE A 51210106016 DHARANI PRIYA. R F H

16 V ECE A 51210106018 ELAMATHI. M F D

17 V ECE A 51210106019 GAYATHRI. C F D

18 V ECE A 51210106020 GAYATHRI. S F H

19 V ECE A 51210106021 GEETHA. D F D

20 V ECE A 51210106022 GUMMIDALA PAVANKUMAR M H

21 V ECE A 51210106023 HARI SHANKAR. S M H

22 V ECE A 51210106024 HEMALATHA. P F D

23 V ECE A 51210106025 INDU PRIYADHARSHINI. A F D

24 V ECE A 51210106026 INDUPRIYA. M. V F D

25 V ECE A 51210106027 JAGADEESH. S. R M H

26 V ECE A 51210106028 JAGADEESWARI. S F H

27 V ECE A 51210106029 JEEVITHA. K F D

28 V ECE A 51210106030 KATAKAM BHAVYA PRATHYUSHA F H

29 V ECE A 51210106031 KAVIASELVAN. S M D

30 V ECE A 51210106032 KAVITHA. M F D

31 V ECE A 51210106033 KAVYALAKSHMI. K F D

32 V ECE A 51210106034 KEERTHANA. D F H

33 V ECE A 51210106035 KEERTHANA. V M D

34 V ECE A 51210106036 KOKILA. R F D

35 V ECE A 51210106037 MAGESH. A M H

37 V ECE A 51210106039 MAHALAKSHMI. A F D

38 V ECE A 51210106040 MAHALAKSHMI. B F D

39 V ECE A 51210106041 MAHALAKSHMI. N F D

40 V ECE A 51210106042 MAHALAKSHMI. P F D

41 V ECE A 51210106043 MAHALAKSHMI. R F D

42 V ECE A 51210106044 MAHENDIRAN. R M D

43 V ECE A 51210106045 MANASA. S F D

44 V ECE A 51210106046 MANIKANDAN. C M D

45 V ECE A 51210106047 MANIMOZHI. R F D





46 V ECE A 51210106048 MANOJ PRADEEP. M M D

47 V ECE A 51210106049 MEENA. A. V F D

48 V ECE A 51210106050 MISBHA. R F D

49 V ECE A 51210106051 MITHELESH GOWTHAM. P. G M D

50 V ECE A 51210106052 MUDI SINDHURA F H

51 V ECE A 51210106053 MURALI. M M D

52 V ECE A 51210106054 MURUGESAN. A M D

53 V ECE A 51210106055 NANDHINI. R F D

54 V ECE A 51210106056 NANDHINI. V F H

55 V ECE A 51210106057 NAVEENPRASATH. E M D

56 V ECE A 51210106058 NAVUKARASI. P F H

58 V ECE A 51210106305 DEEPA.K F D

59 V ECE A 51210106306 P.DEEPIKA F D

60 V ECE A 51210106307 K.DIVYA F D

61 V ECE A 51210160310 INDUMATHI. F D

62 V ECE A 51210106311 KALPANA.S F D

63 V ECE A 51210106321 SARITHA.N F H

64 V ECE A 51210106304 S.CHANDIRAN M D

65 V ECE A 51210106308 M.DINESH m D

66 V ECE A 51210106309 GOPINATH.M M D

67 V ECE A 51210106314 PRAVIN.N M D

68 V ECE A 51210106317 SANTHOSH.K M D

69 V ECE A 51210106326 S.UDAYAKUMAR m D

70 V ECE A 51210106301 S.ANBARASAN M D

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