EC3491 Communication Systems Notes
Download EC3491 Communication Systems Books, Lecture Notes, Part-A 2 marks with answers, Part-B 16 marks Questions, PDF Books. In this Notes Very Useful for Second Year Fourth Semester Students.
“EC3491 Communication Systems Books”
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“EC3491 Communication Systems Notes”
Subject Info:
| Semester | Fourth Semester |
| Department | ECE |
| Year | Second Year |
| Regulation | R 2021 |
| Subject Code / Name | EC3491 Communication Systems |
| Content | Local Authors Books, Lecture Notes |
Syllabus:
EC3491 Communication Systems
UNIT I AMPLITUDE MODULATION
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
Review of probability and random process. Gaussian and white noise characteristics, Noise in amplitude modulation systems, Noise in Frequency modulation systems. Pre-emphasis and De-emphasis, 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
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
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
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.