March 11, 2010

EC1351 DIGITAL COMMUNICATION


ANNA UNIVERSITY CHENNAI :: CHENNAI 600 025
CURRICULUM 2004
B.E. ELECTRONICS AND COMMUNICATION ENGINEERING
EC1351 DIGITAL COMMUNICATION

AIM
To introduce the basic concepts of Digital Communication modulation to baseband, passband modulation and to give an exposure to error control coding and finally to discuss about the spread spectrum modulation schemes.

OBJECTIVES

  • To study pulse modulation and discuss the process of sampling, quantization and coding that are fundamental to the digital transmission of analog signals.
  • To learn baseband pulse transmission, which deals with the transmission of pulse-amplitude, modulated signals in their baseband form.
  • To learn error control coding which encompasses techniques for the encoding and decoding of digital data streams for their reliable transmission over noisy channels.

UNIT I PULSE MODULATION 9

Sampling process –PAM- other forms of pulse modulation –Bandwidth –Noise trade off –Quantization –PCM- Noise considerations in PCM Systems-TDM- Digital multiplexers-Virtues, Limitation and modification of PCM-Delta modulation –Linear prediction –differential pulse code modulation – Adaptive Delta Modulation.

UNIT II BASEBAND PULSE TRANSMISSION 9

Matched Filter- Error Rate due to noise –Intersymbol Interference- Nyquist’s criterion for Distortionless Base band Binary Transmission- Correlative level coding –Baseb and M-ary PAM transmission –Adaptive Equalization –Eye patterns

UNIT III PASSBAND DATA TRANSMISSION 9

Introduction – Pass band Transmission model- Generation, Detection, Signal space diagram, bit error probability and Power spectra of BPSK, QPSK, FSK and MSK schemes –Differential phase shift keying – Comparison of Digital modulation systems using a single carrier – Carrier and symbol synchronization.

UNIT IV ERROR CONTROL CODING 9
Discrete memoryless channels – Linear block codes - Cyclic codes - Convolutional codes – Maximum likelihood decoding of convolutional codes-Viterbi Algorithm, Trellis coded Modulation, Turbo codes.

UNIT V SPREAD SPECTRUM MODULATION 9
Pseudo- noise sequences –a notion of spread spectrum – Direct sequence spread spectrum with coherent binary phase shift keying – Signal space Dimensionality and processing gain –Probability of error – Frequency –hop spread spectrum –Maximum length and Gold codes.

TUTORIAL 15

TOTAL : 60

TEXT BOOKS

  • Simon Haykins, “Communication Systems” John Wiley, 4th Edition, 2001

REFERENCES

    • Sam K.Shanmugam “Analog & Digital Communication” John Wiley.
    • John G.Proakis, “Digital Communication” McGraw Hill 3rd Edition, 1995
    • Taub & Schilling , “Principles of Digital Communication “ Tata McGraw-Hill” 28th reprint, 2003 Bernard's


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