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EC2311/EC6651 Communication Engineering Hand Written Lecture Notes - Lavanya Edition
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Communication Engineering Handwritten Premium Lecture Notes, Prepared by Lavanya. Specially for Electrical and Electronics Engineering Candidates. Syllabus Covered based on Anna University Sixth Semester R2013 and R2008 Regulation.

CONTENT:

UNIT-1 ANALOG COMMUNICATION (Pg.no:40)
UNIT-2 DIGITAL COMMUNICATION (Pg.no:27)
UNIT-3 SOURCE CODES, LINE CODES AND ERROR CODE (Pg.no:47)
UNIt-4 MULTIPLE ACCESS TECHNIQUE (Pg.no:9)
UNIT-5 SATELLITE ORBIT, OPTICAL FIBER – POWER LINE SCALAR (Pg.no:9)

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UNIT-1
ANALOG COMMUNICATION
Types of modulation system
1. Analog modulation system
2. Digital modulation system
Types of electronic communication system
1. Analog communication system
2. Digital communication system
Problems
AM voltage distribution
Voltage spectrum
AM modulation
1. DSBFC (Double Side Band Full Carried)
2. DSBSC ( Double Side Band Suppressive carrier) 
3. SSB ( Single Side Band)
4. VSB ( Vestigial Side Band)
Phasor representation of AM
Generation of AM 
1. Low level modulation
2. High level modulation
Types of modulators
1. Low level AM modulator
2. High Level AM modulator
Power efficiency calculation
Advantages of collector modulator
Comparison of low and high level modulation
Generation of non- linear property
1. Square modulator
2. Balanced modulator
Switching modulator
Angle modulation
Advantages disadvantages
Application
Types of FM
1. Narrow band FM
2. Wide band FM
Band width for angle modulated wave
Generation of FM
Methods of FM generation
1. Direct method
a. Reactance modulator
b. Varactor modulator
2. Indirect method
a. Armstrong method

UNIT-2
DIGITAL COMMUNICATION
Pulse modulation
1. Analog PM
2. Digital PM
Analog modulation
Sampling process
Sampling method
1. Ideal sampling
2. Natural sampling
3. Flat topped sampling
Pulse time modulation
Transmission path
Dynamic range
Companding
Types of companding
1. Analog companding
2. Digital companding
ADM
DPCM
Amplitude shift keying
Frequency shift keying
FSK transmitter
QPSK transmitter

UNIT-3
SOURCE CODES, LINE CODES AND ERROR CODE
Properties of information
Average information
Problems
Source coding
Huffman coding
Shannon fano coding
BSC
Error control coder
Types
1. Block codes
2. Conventional codes
Problems
BW-SNR trade codes
Line coding
Differential man chester
Bipolar encoding

UNIt-4
MULTIPLE ACCESS TECHNIQUE
Duplexing
Multiplexing
Types of multiplexing
1. FDMA – Frequency Division Multiple Access
2. TDMA – Time Division Multiple Access
3. CDMA – Code Division Multiple Access
4. SDMA – Space Division Multiple Access
Self jamming
Advantages
Disadvantages
Applications

UNIT-5
SATELLITE ORBIT, OPTICAL FIBER – POWER LINE SCALAR
Satellite orbit
Satellite height
1. Circular orbit
2. Elliptical orbit
Earth station
Multiple access techniques
Optical fiber communication system
Application
Characteristics and behavior of light
Critical angle
Snell’s law
Fiber optic cable
By rating the index mode
1. Multimode step index
2. Single mode step index
3. Multimode graded index

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