EC3491 Communication Systems Study Materials
Anna University – EC3491 Communication Systems Regulation 2021 Syllabus , Notes , Important Questions, Question Paper with Answers Previous Year Question Paper.
UNIT I AMPLITUDE MODULATION EC3491 Communication Systems Syllabus
Review of signals and systems, Time and Frequency domain representation of signals, Principles of
Amplitude Modulation Systems- DSB, SSB and VSB modulations. Angle Modulation, Representation
of FM and PM signals, Spectral characteristics of angle modulated signals. SSB Generation – Filter
and Phase Shift Methods, VSB Generation – Filter Method, Hilbert Transform, Pre-envelope &
complex envelope AM techniques, Superheterodyne Receiver.
UNIT II RANDOM PROCESS & SAMPLING EC3491 Communication Systems Notes
Review of probability and random process. Gaussian and white noise characteristics, Noise in
amplitude modulation systems, Noise in Frequency modulation systems. Pre-emphasis and Deemphasis, Threshold effect in angle modulation.
Low pass sampling – Aliasing- Signal Reconstruction-Quantization – Uniform & non-uniform
quantization – quantization noise – Nyquist criterion- Logarithmic Companding –PAM, PPM, PWM,
PCM – TDM, FDM
UNIT III DIGITAL TECHNIQUES EC3491 Communication Systems Important Questions
Pulse modulation Differential pulse code modulation. Delta modulation, Noise considerations in
PCM,, Digital Multiplexers, Channel coding theorem – Linear Block codes – Hamming codes – Cyclic
codes – Convolutional codes – Viterbi Decoder
UNIT IV DIGITAL MODULATION SCHEME EC3491 Communication Systems Question Bank
Geometric Representation of signals – Generation, detection, IQ representation, PSD & BER of
Coherent BPSK, BFSK, & QPSK – QAM – Carrier Synchronization – Structure of Non-coherent
Receivers Synchronization and Carrier Recovery for Digital modulation, Spectrum Analysis –
Occupied bandwidth – Adjacent channel power, EVM, Principle of DPSK
UNIT V DEMODULATION TECHNIQUES EC3491 Communication Systems Question Paper
Elements of Detection Theory, Optimum detection of signals in noise, Coherent communication with
waveforms- Probability of Error evaluations. Baseband Pulse Transmission- Inter symbol
Interference, Optimum demodulation of digital signals over band-limited channels.
| Syllabus | Click Here |
| Notes | Click Here |
| Important Questions | Click Here |
| Previous Year Question Paper | Click Here |
| Question Bank | Click Here |
TEXTBOOKS : EC3491 Communication Systems Notes
1. Simon Haykins,” Communication Systems”, Wiley, 5th Edition, 2009.(Unit I – V)
2. B.P.Lathi, “Modern Digital and Analog Communication Systems”, 4th Edition, Oxford
University Press, 2011.
REFERENCES : EC3491 Communication Systems Important Questions
1. Wayner Tomasi, Electronic Communication System, 5th Edition, Pearson Education,2008.
2. D.Roody, J.Coolen, Electronic Communications, 4th edition PHI 2006
3. A.Papoulis, “Probability, Random variables and Stochastic Processes”, McGraw Hill, 3rd
edition, 1991.
4. B.Sklar, “Digital Communications Fundamentals and Applications”, 2nd Edition Pearson
Education 2007
5. H P Hsu, Schaum Outline Series – “Analog and Digital Communications” TMH 2006
6. Couch.L., “Modern Communication Systems”, Pearson, 2001
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