Year : TYEJ Sub: Digital Communication (17535) Assignment No. 1. Introduction of Digital Communication. Question Exam Marks

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1 Assignment 1 Introduction of Digital Communication Sr. Question Exam Marks 1 Draw the block diagram of the basic digital communication system. State the function of each block in detail. W State advantages of digital communication S Compare Analog and Digital Communication S Compare between analog and digital pulse modulation technique 5 Draw and explain basic communication system block diagram. W Compare analog pulse modulation with digital pulse modulation 7 State two advantages and disadvantages of digital communication system. 1

2 Assignment 2 Digital Pulse Modulation Techniques. Sr. Question Exam Marks 1 State and describe the sampling theorem with neat waveform. 2 Draw the block schematic of PCM transmitter. State the function of each block. 3 What is slope overload? Draw the schematic of adaptive delta modulation technique.. 4 Draw block schematic of DPCM transmitter and receiver 5 Describe the process of quantization with neat sketch. 6 State the advantages and disadvantages of PCM (any two each). 7 What is meant by Quantization error? Describe quantization process in brief. 8 Draw and explain PCM transmitter Block diagram. S Draw and explain block diagram of Delta Modulation. S State sampling theorem. Describe different types of sampling techniques. 11 State Shanon s Hartley theorem and write it s statement. 12 Write different types of Pulse Modulation. With the help of Block diagram and waveform explain PCM transmitter. 13 Write about advantages and disadvantages of Delta Modulation. 14 State sampling theorem and write about it s importance. 15 With the help of neat sketch explain quantization process. 16 Draw and explain the block diagram of Delta Modulation. Also explain slope overload and granular noise in linear delta S modulation. 17 State sampling theorem. Calculate Nyquist rate for voice signal of range 300 Hz to 3400 Hz. 18 Explain quantization and quantization error. 19 Draw the block diagram of Adaptive Delta modulation transmitter and illustrate its working with waveforms. 20 Using Shannon Hartley theorem, calculate channel capacity for a channel having BW of 15 khz and signal to noise ratio of 20 db. 21 Explain the role of predictor in differential pulse code modulation. 2

3 Assignment 3 Coding Methods and Error Control. Sr. Question Exam Marks 1 Define line coding. Give the classification of line coding. 2 Describe working of CRC generator and checker with an example. W For the binary data stream draw the Return to zero, non- Return to zero, AMI and Manchester Codes. W State the different types of errors in digital communication. Describe each with example. 5 Define the following terms : (i) Code word (ii) Code rate W (iii) Hamming weight (iv) Hamming distance related to code. 6 Explain North American digital Multiplexing hierarchy with neat diagram. S List different types of errors and their causes. S Draw unipolar RZ, NRZ, Manchestor and Alternate Mark inversion Line code waveform for data stream S Explain Hamming code with suitable example. Find the Hamming weight of the code vector X = S Encode the following Binary data stream into unipolar RZ, unipolar NRZ, Polar Return Zero (RZ), Polar NRZ, AMI and W split phase Manchester code Data stream : With example explain how Hamming code is used for single bit error correction implications. 12 State the different types of error present in digital communication system. Find the Hamming weight of W following code vector. X = Generate the Cyclic Redundancy check (CRC) for the data word using divisor Explain with example how hamming code is used for single bit error correction. 15 Define line coding. Draw the waveforms for a binary sequence for following signal codes : (i) Polar R Z (ii) Unipolar NRZ S (iii) Manchester (iv) Alternate Mark Invasion (AMI) 16 Explain the working of CRC generator and checker. S State the types of errors present in the digital communication system. Also explain the causes and effects of errors. 3

4 Assignment 4 Digital Modulation Technique. Sr. Question Exam Marks 1. Describe the generation of BFSK with block diagram. State the mathematical equation. Draw power density spectrum. W What is M-ary encoding? Compare the bandwidth requirement for BPSK, QPSK, QAM and M-ary PSK. 3. What are the different types of QAM? Draw constellation diagram of 4 QAM. 4. Draw and describe QAM transmitter and receiver. W Compare between BPSK and QPSK w.r. to variable characteristics of the carrier, type of modulation, Bit rate/baud rate and application. 6. Describe QPSK generator with waveforms. 7. List out different digital modulation technique and explain amplitude shift keying with suitable circuit diagram and waveforms. 8. Explain M-ary Encoding Technique. 9. What is constellation diagram and draw constellation diagram for 16-QAM modulator? 10 Draw the block diagram of DPSK transmitter and explain its working. 11. Draw QPSK Modulator block diagram. Explain with constellation diagram and phasor diagram. S Compare between QAM and QPSK (any four point). 10. Draw and explain PSK receiver block diagram. 11. Explain principle of QAM with the block diagram. Also draw constellation diagram of 4-QAM. 12. Draw and explain DPSK transmitter working principle. 13. Write about M-ary encoding. State any two advantage and disadvantage. 14. Draw and explain PSK transmitter block diagram. 15. State bandwidth required for BASK, BFSK, BPSK and QPSK. Also draw waveforms for binary data in ASK, FSK, S PSK and QPSK modulation. 16. Compare QPSK and QASK (any 4 points) 17. Draw and explain the block diagram of FSK with suitable waveform. 18. Explain the generation of DPSK with block diagram. 4

5 Assignment 5 Multiplexing & Multiple Access. Sr. Question Exam Marks 1 Define multiplexing. Describe the need of multiplexing. 2 Describe FDM technique with block diagram. Compare it with TDM with respect to definition, synchronization, cross W talk and fading. 3 Give the advantages of TDMA over FDMA (any four). 4 Describe the basic principle involved in CDMA technology with neat sketch. State its any four advantages. 5 Compare between FDMA, TDMA and CDMA system (any six point). S State WDM technique and write its two advantage. 7 Explain CDM technique with its block diagram. 8 Define FDM and explain frequency division multiplexing with block diagram. S Explain basic principle involved in CDMA technology. 10 Draw and Explain the block diagram of Code Division Multiplexing (CDM) system. 11 Draw block diagram of TDMA technology and explain it s operation. Give the advantage of TDMA over FDMA. 12 Explain the CCITT digital multiplexing hierarchy with block diagram. 13 List any four advantages of TDMA over FDMA. 14 Draw block diagram of TDMA and explain it. State advantages of TDMA over FDMA. S Explain the concept of CDMA technology. 5

6 Assignment 6 Topic 6: Spread Spectrum Modulation Sr. Question Exam Marks 1 List the applications of spread spectrum modulation. (any four) 2 Define PN sequence. Draw the pseudo random sequence generator. 3 Compare FHSS and DSSS system. (any four points) W Draw and explain the block diagram of DSSS based CDMA system. 5 State the principle of orthogonality and describe OFDM techniques. 6 Write any four specification of T-carrier system. 7 List out application of spread spectrum systems. 8 Why pseudo-noise sequence is used in spread spectrum modulation? 9 List out advantages and disadvantages of FHSS system. 10 Why pseudo-noise sequence used in spread spectrum modulation. 11 With the help of OFDM block diagram. Explain it s working. 12 Explain fast frequency hopping with suitable diagram. 13 Draw block diagram of PN sequence generator using 4 D- Flip flop. 14 Draw the block diagram of Direct sequence spread spectrum and state the function of each block. 6

QUESTION BANK SUBJECT: DIGITAL COMMUNICATION (15EC61)

QUESTION BANK SUBJECT: DIGITAL COMMUNICATION (15EC61) Module 1 1. Explain Digital communication system with a neat block diagram. 2. What are the differences between digital and analog communication systems?