DIGITAL COMMUNICATION Beginner Guide

UNIT I SAMPLING & QUANTIZATION
Low pass sampling – Aliasing- Signal Reconstruction-Quantization – Uniform & non-uniform quantization – quantization noise – Logarithmic Companding of speech signal- PCM
TDM
UNIT II WAVEFORM CODING
Prediction filtering and DPCM – Delta Modulation – ADPCM & ADM principles-Linear Predictive Coding.
UNIT III BASEBAND TRANSMISSION
Properties of Line codes- Power Spectral Density of Unipolar / Polar RZ & NRZ – Bipolar NRZ – Manchester- ISI – Nyquist criterion for distortionless transmission – Pulse shaping – Correlative coding – Mary schemes – Eye pattern – Equalization
UNIT IV DIGITAL MODULATION SCHEME
Geometric Representation of signals – Generation, detection, PSD & BER of Coherent BPSK, BFSK & QPSK – QAM – Carrier Synchronization – the structure of Non-coherent Receivers – Principle of DPSK.
UNIT V ERROR CONTROL CODING
Channel coding theorem – Linear Block codes – Hamming codes – Cyclic codes – Convolutional codes – Viterbi Decoder

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