JAYARAJ ANNAPACKIAM C.S.I. COLLEGE OF ENGINEERING,(An ISO 9001:2008 Certified Institution)

MARGOSCHIS NAGAR, NAZARETH – 628 617.

DEPARTMENT OF ECE

Faculty Name: Mr. C. Jefferson Thompson Subject Name: DIGITAL COMMUNICATION Subject code: EC 51Class/Sec : III ECE A

AIM:To introduce the basic concepts of Digital Communication in baseband and passband domains and to give an exposure to error control coding techniques.

OBJECTIVES: To study signal space representation of signals and discuss the process of

sampling, quantization and coding that are fundamental to the digital transmission of analog signals.

To understand baseband and bandpass signal transmission and reception techniques.

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 DIGITAL COMMUNICATION SYSTEM 8 Introduction to Analog Pulse Communication Systems – Digital Communication Systems – Functional description, Channel classification, Performance Measure; Geometric representation of Signals, Bandwidth , Mathematical Models of Communication Channel.

UNIT II BASEBAND FORMATTING TECHNIQUES 10 Sampling – Impulse sampling, Natural Sampling, Sampler Implementation; Quantisation – Uniform and Non-uniform; Encoding Techniques for Analog Sources- Temporal waveform encoding, Spectral waveform encoding, Model-based encoding, Comparison of speech encoding methods.

UNIT III BASEBAND CODING TECHNIQUES 9 Error Control Codes - Block Codes , Convolutional Codes, Concept of Error Free Communication; Classification of line codes, desirable characteristics and power spectra of line codes.

UNIT IV BASEBAND RECEPTION TECHNIQUES 9Noise in Communication Systems; Receiving Filter – Correlator type, Matched Filter type; Equalising Filter - Signal and system design for ISI elimination, Implementation, Eye Pattern analysis; Synchronisation; Detector – Maximum Likelihood Detector, Error Probability, Figure-of-Merit for Digital Detection.

UNIT V BANDPASS SIGNAL TRANSMISSION AND RECEPTION 9Memory less modulation methods - Representation and Spectral characteristics, ASK, PSK, QAM, QPSK, FSK; Bandpass receiving filter, Error performance – Coherent and Non-coherent detection systems.

Total= 45 Periods

TEXT BOOKS:

1. Amitabha Bhattacharya, “Digital Communications”, Tata McGraw Hill, 2006.2. Simon Haykin, “Digital Communications”, John Wiley, 2006.

REFERENCES :

1. John.G. Proakis, “Fundamentals of Communication Systems”, Pearson Education, 2006.

2. Michael. B. Purrsley, “Introduction to Digital Communication”, Pearson Education, 2006.

3. Bernard Sklar, Digital Communication, 2nd Edition, Paerson Education, 20064. Herbert Taub & Donald L Schilling – Principles of Communication Systems

( 3rd Edition ) – Tata McGraw Hill, 2008.5. Leon W. Couch, Digital and Analog Communication Systems, 6th Edition,

Pearson Education, 2001.

JAYARAJ ANNAPACKIAM C.S.I. COLLEGE OF ENGINEERING,(An ISO 9001:2000 Certified Institution)

MARGOSCHIS NAGAR, NAZARETH – 628 617.

Course Plan

Sl.No TopicNo. ofHours

requiredUnit No.

ReferenceBooks

Unit I. DIGITAL COMMUNICATION SYSTEM

01 Introduction to Digital communication

1 I T1(3)

02 Introduction to Analog Pulse Communication Systems

1 I T1(3)

03 Digital Communication Systems – Functional description

1 I T1(7)

04 Channel classification, Performance Measure

2 I T1(9,10)

05 Geometric representation of Signals

1 I T1(15)

06 Bandwidth 1 I T1(25)07 Mathematical Models of

Communication Channel1 I T1(29)

08 Review of UNIT 1 2 IUnit II. BASEBAND FORMATTING TECHNIQUES

09 Sampling 1 II T1(111)10 Impulse sampling 1 II T1(111)11 Natural Sampling and Sampler

Implementation2 II T1(113,115)

12 Quantisation 1 II T1(118)13 Uniform Quantisation 1 II T1(119)14 Non-uniform Quantisation 1 II T1(122)15 Encoding Techniques for Analog

Sources1 II T1(124)

16 Temporal waveform encoding 1 II T1(125)17 Spectral waveform encoding 1 II T1(167)18 Model-based encoding 1 II T1(169)19 Comparison of speech encoding

methods.1 II T1(174)

Unit III. BASEBAND CODING TECHNIQUES20 Error Control Codes 1 III T1(294)21 Block Codes 2 III T1(200)22 Problems 1 III T1(205,206)23 Convolutional Codes 1 III T1(220)24 Problems 2 III T1(223)

25 Concept of Error Free Communication

1 III T1(238)

26 Classification of line codes 1 III T1(265)27 Desirable characteristics and

power spectra of line codes1 III T1(267,268)

Unit IV. BASEBAND RECEPTION TECHNIQUES28 Noise in Communication Systems 1 IV T1(294)29 Receiving Filter – Correlator type 1 IV T1(296)30 Matched Filter type 1 IV T1(302)31 Equalising Filter 1 IV T1(310)32 Signal and system design for ISI

elimination,Implementation2 IV T1(328)

33 Eye Pattern analysis 1 IV T1(336)34 Synchronisation 2 IV T1(337)35 Maximum Likelihood Detector 1 IV T1(343)36 Error Probability, Figure-of-Merit

for Digital Detection2 IV T1(359)

Unit V. BANDPASS SIGNAL TRANSMISSION AND RECEPTION37 Memory less modulation methods 1 V T1(373)38 ASK 1 V T1(405)39 PSK 1 V T1(412)40 QAM 1 V T1(447)41 QPSK 1 V T1(413)42 FSK 1 V T1(461)43 Bandpass receiving filter 1 V T1(435)44 Error performance 1 V T1(436)45 Error performance-Coherent

systems1 V T1(437)

46 Error performance-Non coherent systems

1 V T1(454)

47 Review of UNIT V

Total number of hours required: 45

Signature of the Staff Signature of the HOD