Anna University -Study Materials for all Departments # CS2204/CS36/EC1207/10144 CS 305/080230008- Analog and Digital Communication (ADC) UNIT II Part B Question Bank

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CS2204/CS36/EC1207/10144 CS 305/080230008- Analog and Digital Communication (ADC) UNIT II Part B Question Bank
Department of Computer science and Engineering

Meant for Anna University Coimbatore,trichy,trinelveli

Question Bank
(Regulation 2008/2010/2013)
___________________________________________________________________________________
Details:
Year: second Year
Department: B.E Computer Science and Engineering
Semester:Three(III)
Content: CS2204/CS36/EC 1207/10144 CS 305/080230008- Analog and Digital Communication (ADC) UNIT I Part A Question Bank
Subject code: CS2204/CS36/EC1207/10144 CS 305/080230008
Subject Name: Analog and Digital Communication (ADC)
Unit Number: II
Regulation: 2008 or 2010 or 2013
Post Type: Question Bank

PART – B (16 MARKS)

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)
9) Draw the block diagram of FSK receiver and explain the operation. Determine the : (i)
peak frequency deviation (ii) minimum bandwidth (iii) baud for FSK signal with a mark
frequency of 49 kHz, space frequency of 51 kHz, and input bit rate of 2 kbps.
10) Draw the block diagram of QPSK modulator and explain its operation. For QPSK
modulator, construct the truth table, phasor diagram and constellation diagram.
11) 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.
12) (i) Illustrate the concept of 8 QAM transmitter with the truth table. (8)
(ii) What is the need for carrier Recovery? Explain the Costas loop method of carrier
recovery. (8

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