Important RGPV Question
EC-502, Digital Communication
V Sem, EC
UNIT 1
Q.1 Explain different types of Sampling. What is Aperture effect and aliasing effect? (RGPV Nov 2022)
Q.2 With the help of suitable diagram explain the generation of PWM wave. (RGPV Nov 2022)
Q.3 Define and explain sampling theorem for low pass signal. Also explain cross talk and aliasing effect. (RGPV Nov 2023)
Q.4 Explain the generation and detection of PWM signal. (RGPV Nov 2023)
Q.5 Write sampling theorem for low pass and band pass signals. Also explain time division multiplexing in brief. (RGPV May 2024)
Q.6 Compare PAM, PWM, PPM and describe generation and detection of any one. (RGPV May 2024)
UNIT 2
Q.1 Explain about need of quantization, what and how is quantization done? What is quantization noise and how can it be reduced? (RGPV Nov 2022)
Q.2 Explain the generation and detection of delta modulated signal. (RGPV Nov 2022)
Q.3 Explain the concept of AMI encoding technique. (RGPV Nov 2022)
Q.4 Explain the concept of differential encoding and its advantages and disadvantages. (RGPV Nov 2022)
Q.5 What is quantization and derive the expression of quantization noise? (RGPV Nov 2023)
Q.6 What is differential coding? What are its advantages and disadvantages? (RGPV Nov 2023)
Q.7 What is quantization and derive the expression of quantization noise? (RGPV Nov 2023)
Q.8 What is differential coding? What are its advantages and disadvantages? (RGPV Nov 2023)
Q.9 Discuss following in brief: (RGPV May 2024)
i) Quantization and quantization noise
ii) Delta and adaptive modulation
iii) RZ signaling and bipolar signaling
Q.10 Explain companding and inter symbol interference. (RGPV May 2024)
Q.11 Describe eye pattern and on-off signaling. (RGPV May 2024)
Q.12 Explain following in detail: (RGPV May 2024)
i) Natural sampling and flat top sampling (Unit 1)
ii) Manchester code (Unit 2)
iii) Polar signaling (Unit 2)
UNIT 3
Q.1 Explain the generation and detection of following: a) BPSK b) QAM (RGPV Nov 2022)
Q.2 Discuss the concept of M-ary PSK. (RGPV Nov 2022)
Q.3 Discuss the spectral properties of QPSK and MSK. (RGPV Nov 2022)
Q.4 Write short notes on: (RGPV Nov 2022)
a) DPSK
b) Gram Schmidt orthogonalization procedure.
Q.5 With the help of block diagram explain the generation and detection of QPSK signal, (RGPV Nov 2023)
Q.6 With the help of block diagram explain the generation and detection of coherent and non coherent BFSK signal. (RGPV Nov 2023)
Q.7 Differentiate following with neat diagram. (RGPV May 2024)
i) ASK and BPSK
ii) QPSK and DPSK
iii) Coherent and non coherent BFSK
Q.8 Discuss spectral properties of QPSK and MSK. (RGPV May 2024)
Q.9 Discuss following in brief with suitable examples. (RGPV May 2024)
i) Concept of M-ary PSK and M-ary FSK
ii) Matched filter and correlator detector
UNIT 4
Q.1 Explain the concept of matched filter and correlator. (RGPV Nov 2022)
Q.2 Calculate the probability of error for BPSK system. (RGPV Nov 2022)
Q.3 Explain the working of matched filter and correlator detector. (RGPV Nov 2023)
Q.5 Determine the error probability of QPSK signal. (RGPV Nov 2023)
Q.6 Write short notes on any two of the following: (RGPV Nov 2023)
- a) Gram Schmidt Orthogonalisation
- b) Error probability of QAM
- c) Cyclic codes
Q.7 What is Grain Schmidt orthogonalization procedure? Explain the concept of signal space for the computation of probability of error. (RGPV May 2024)
Q.8 Calculate error probability for BPSK, QPSK and QAM systems. (RGPV May 2024)
UNIT 5
Q.1 What is channel capacity, discuss about Shannon’s theorem. (RGPV Nov 2022)
Q.2 Discuss about linear block codes and cyclic codes. (RGPV Nov 2022)
Q.3 Derive the expression of channel capacity in terms of mutual information. Also calculate the channel capacity for noise free channel. (RGPV Nov 2023)
Q.4 For a BSC shown in fig. I find the channel capacity for i) P = 0.9 ii) P = 0.6
(RGPV Nov 2023)
Q.5 Describe following in brief: (RGPV May 2024)
- i) Entropy and information rate
- ii) BW and signal to noise ratio trade off
iii) Linear block codes and cyclic codes
Q.6 State Shannon’s theorem and Shannon Hartley theorem. Also describe concept of convolution codes. (RGPV May 2024)
Q.7 How differential encoding is achieved? Write advantages and disadvantages of differential encoding. (RGPV May 2024)
Q.8 Draw encoder and decoder circuits and describe burst error correcting codes. (RGPV May 2024)
Q.9 Write technical short note on following: (RGPV May 2024)
i) Crosstalk and aliasing
ii) Encoding techniques
iii) Minimum shift keying
iv) Comparison of different modulation techniques.
— Best of Luck for Exam —
