Modern Digital Communication Techniques M.Tech Model Question Paper : mgu.ac.in

Name of the University : Mahatma Gandhi University
Department : Information Technology
Degree : M.Tech
Subject Code/Name : MITNE 205.2/Modern Digital Communication Techniques
Sem : II
Website : mgu.ac.in
Document Type : Model Question Paper

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MGU Modern Digital Communication Techniques Question

M.TECH. Degree Examination :
Second Semester :

Related / Similar Question Paper : MGU M.Tech Trends In Middleware Systems Question Paper

Model Question Paper – I

Branch: Information Technology
Specialization: Network Engineering
MITNE 205.2 Modern Digital Communication Techniques :
(Elective III)
(Regular – 2011 Admission onwards)
Time: Three hours
Maximum: 100 Marks

1 a) Explain the following terms:-
i. Information and Information rate.
ii. Entropy
iii. Shannon’s theorem
iv. Channel capacity (10 marks)

b) Define and explain various multiplexing techniques used in communication systems. (15 marks)
OR
2 a) Describe the scalar and vector communication over memory less channel. (15 marks)

b) Explain :
i. Shannon Hartley capacity theorem
ii. Shannon limit. (10 marks)

3 a) Define code word, code rate and hamming weight. Also write short note on Hamming code. (15 marks)
b) Write a short note on:
i. Viterbi algorithm
ii. Cyclic code. (10 marks)
OR

4 a) The generator matrix of (6, 3) systematic block code is given by,
G= {{1,0, 0, 0, 1, 1},{0,1,0,1,0,1},{0,0,1,1,1,0} }
i. Find code vectors.
ii. Find the parity check matrix
iii. Find the error syndrome. (15 marks)

(b) With a suitable example explain the Hamming and cyclic codes. (10 marks)
5a) For a 16-ary PCM system if,
P1=P2=P3=P4=0.1
P5=P6=P7=P8=0.05
P9=P10=P11=P12=0.075
P13=P14=P15=P16=0.025
Calculate the entropy and information rate assume fm= 3 KHz. (15 marks)

b) Explain FDM and TDM. (10 marks)
OR
6 a) Explain the transmitter and receiver for the Adaptive delta modulation system. (10 marks)

b) An AM signal appears across a 50? load has the following equation:-
V (t) =12(1+ sin 12.566 x 10³ t) sin 18.85 x 10³t Volts.
i. Sketch the envelope of this signal in time domain.
ii. Calculate the modulation index, side band frequencies, total power and bandwidth. (15 marks)

7. Write short notes on:-
i. Various noise parameters.
ii. Mouse in communication system.
iii. Intersymbol interference.
iv. QAM. (25 marks)
OR

8a) What is line coding? Draw the waveforms if the sequence is transmitted using:-
i. Unipolar Rz
ii. Polar Rz
iii. AMI
iv. Split phase Manchester.
v. M ary where M=4
Assume the binary sequence 11010011. (15 marks)
b) Explain the QAM Transmitter and Receiver. (10 marks)

Model Question Paper – II

1 a) What is an eye pattern? How it is used to know the information about a channel. (10 marks)
b) Describe the different equalization techniques used for band limited channels. (15 marks)
OR

2 a) Explain transmission path‘d’ in satellite communication. Derive equation for‘d’. What is the condition for minimum path? (15 marks)

b) A spread spectrum communication system has the following parameters: Information bit duration Tb = 4.095 ms, PN chip duration Tc = 1 µs , the energy to noise ratio Eb/No = 10.
Calculate the processing gain and Jamming margin. (10 marks)

3 a) Write short notes on vertical and horizontal check schemes for error detection. (10 marks)
b) With diagram, explain a four-wire terminating set in telephony. (15 marks)
OR

4 a) Explain how connection is made in telephony using step-by-step switching. (10 marks)
b) With a suitable example explain the Hamming and cyclic codes. (15 marks)

5 a) Explain with block diagram PM modulation and demodulation technique. (10 marks)
b) Draw and explain superheterodyne receiver for amplitude modulation. What are the various characteristics of the receiver? (15 marks)
OR

6 a) Explain ratio detector with circuit diagram and explain why Ratio detector preferred over Foster –Seeley detector for FM modulation. (15 marks)
b) Explain briefly about the IQ modulation and demodulation. (10 marks)

7 a) Write a short note on:
i. Zero forcing algorithm
ii. LMA algorithm. (10 marks)

b) What is line coding? Draw the waveforms if the sequence is transmitted using:-
i. Unipolar Rz
ii. Polar Rz
iii. AMI
iv. Split phase Manchester.
v. M ary where M=4
Assume the binary sequence 11010011. (15 marks)
OR

8 a) Explain the principle of Amplitude shift keying. With help of circuit diagram, explain ASK generation. (10 marks)
b) Explain with diagram, generation and demodulation of PSK. What are the advantages of DPSK over PSK? (15 marks)