__EC2301 DIGITAL COMMUNICATION Question Bank Question Paper Model Question Paper Anna University Question Bank Important Questions 2 marks and 16 marks questions__

__EC2301 DIGITAL COMMUNICATION Question Bank Question Paper Model Question Paper Anna University Question Bank Important Questions 2 marks and 16 marks questions__

__QUESTION BANK__

**SUBJECT CODE:**

**EC2301**

**DIGITAL COMMUNICATION**

**UNIT-1**:

**DIGITAL COMMUNICATION SYSTEM**

__Part A ( 2 Marks)__

1. Give the mathematical form of sampling process

2. List out uses of sampling theorem

3. Define instantaneous sampling

4. What is anti alising effect

5. What is PWM

6. List out the types of Quantization

7. Define bandwidth.

8. Transfer 01101001 in to Manchester code

9. What is noise consideration in PCM

10. Define processing gain.

**Part B**

1. Drive the expression for the sampling process in time domain.

**(16)**2. What are all the types of sampling technique and explain about any two.

**(16)**3. a. Explain the generation of PPM and PWM with neat circuit diagram.

**(8)**b. Explain the quantization process with PCM block diagram.

**(8)**4. Write brief notes on 1) TDM

**(8 )**2) FDM

**(8)**5. Compare DM with ADM and explain linear prediction filter.

**(16)****UNIT -2**:

**BASEBAND FORMATTING TECHNIQUES**

__Part A ( 2 Marks)__

1. Define matched filter

2. What is decision device

3. Draw the block diagram of base band binary data transmission system

4. What is Nyquist channel

5. Draw the frequency and time response of raised cosine spectrum

6. What you mean by correlative level coding

7. Define LMSA

8. What is DFE

9. List out the use of eye patterns

10.Define zero crossing effect

**Part B**

1. Derive the expression for the matched filter and prove any one property.

**(16)**2. Prove the effect ISI using necessary block diagram and design.

**(16)**3. Write brief notes on Nyquist’s criterion for distortion less base band binary transmission.

**(16)**4. Explain the six array PAL transmission.

**(16)**5. Why do we adoptive equalizer and design any one type of adoptive equalizer.

**UNIT – 3**:

**BASEBAND CODING TECHNIQUES**

__Part - A ( 2 Marks)__

1. Define FSK

2. Draw the Basic block diagram of FSK

3. Define MFSK

4. Draw the wave form of the MPSK

5. What is MSK

6. Define Non-coherent FSK

7. Differentiate coherent FSK from Non-coherent FSK

8. What do you mean by Probability error.

9. Define Passband transmission.

10 Draw the baseband signal.

**Part B**

1. Derive the expression for the BPSK technique.

**(16)****2.**Explain the MFSK and derive the pe.

**(16)**

3. Draw the space diagram of MSK and explain about the same.

**(16)**4. Derive the error probability expression for the MPSK.

**(16)**5. Compare the all types of Passband transmission.

**(16)****Unit- 4**:

**BASEBAND RECEPTION TECHNIQUES**

__Part A ( 2 Marks)__

1. Define the Channel coding

2. List out the uses of the Channel Coding

3. Differentiate Sourced coding from the Channel coding.

4. Prove any two properties of Block Codes.

5. What is syndrome?

6. Define Code rate.

7. What is BSC?

8. Draw the channel diagram of the BPSK system

9. What is turbo codes

10. Define CRC.

**Part B**

1. Explain the channel coding technique used in the Block codes.

**(16)**2. What are all the message vectors can be extracted from the

code vector that was generated by 1+X+X3.

**(16)**3. Explain the Viterbi algorithm for the detection of any two

message vectors (One Word) from the code vectors that

were generated by (111), (101) and (011).

**(16)**4. Explain the construction of Block Code and

Explain how error syndrome is calculated.

**(16)**5. Explain in detail about Orthogonal codes, Biorthogonal codes and

Transorthogonal codes.

**(16)****UNIT- 5**:

**BANDPASS SIGNAL TRANSMISSION AND RECEPTION**

__Part A ( 2 Marks)__

1) What are all the types of SSM

2) What is the use of PN sequence

3) List out the prosperities of PN sequence

4) What is the processing gain of SSM.

5) Define jamming margin

6) Define FHSSM

7) Define SFHSS.

8) Define FFHSM.

9) Draw the PN sequence generator for [6,4,2,1]

10) What you mean by runs in PN sequence

11) State the Gold Theorem.

**Part B**

1. Generate the PN sequence for [5, 4, 3, 1] and prove the all properties of the same.

**(16)**2. List out and prove the Properties of the PN sequence.

**(16)**3. Explain the concept of DS/BPSK.

**(16)**4. List out the uses of the FH. Explain the FH techniques with the frequency spectrum.

**(16)**5. Write shorts notes on

1. Probability Error.

**(4)**2. Jamming Margin

**(4)**3. (S/N) of the DS System.

**(8)**
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