Digital Communication EC2301 ND2013 5th Semester Question Paper

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Anna University Question Paper
B.E./B.Tech. DEGREE EXAMINATION , NOVEMBER /DECEMBER 2013
SUBJECT CODE:EC2301
DIGITAL COMMUNICATION
FIFTH SEMESTER. E.C.E

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part A

1.mention the advantages of digital communication.
2.what is a channel? give examples.
3.what is natural sampling.
4.write a law of compression.
5.what is line coding.
6.define code and block rate.
7.mention two properties of matched filter.
8.what is the use of eye pattern.
9.mention the drawbacks of amplitude shift keying.
10.what are coherent systems.





Part B

11.a.1.explain the various analog pulse communication system describing their advantages and drawbacks.
2.describe how channels can be classified and briefly explain each.
or
b.1.describe the elements of digital communication system.
2.explain the mathematical models of various communication channels.

12.a.describe temporal and spectral waveform encoding methods.
or
b.explain the process of quantization and obtain an expressions for signal to quantization ratio in the case of a uniform quantizer.

13.a.describe the steps involved in the generation of linear block codes. define and explain properties of syndrome
or
b.1. explain how conventional codes can be generated. illustrate with an example.
2.for a conventional encoder of constraint length 3 and rate 1/2. obtain the encoded output for the input message 10011.

14.a.1.describe with neat diagram the functioning of a correlator type receiver.
2.explain the equivalence between correlator and mismatched filter receiver.
or
b.describe coherent detection using maximum like hood detector.

15.describe with diagrams the generation and detection of coherent binary FSK . explain the probability of error for this scheme.
or
b.1.explain the generation and detection of binary PSK.
2.describe with signal space diagram quadrature amplitude modulation and its differences with respect to QPSK.