EC6501 Digital Communication Important Questions

Unit 1

 Low pass sampling

 Aliasing

 Signal Reconstruction and Uniform & non-uniform Quantization

 PCM

 TDM 56v

Unit 2

 DPCM

 Delta Modulation

 ADPCM & ADM principles-Linear Predictive Coding

Unit 3

 Power Spectral Density of Unipolar / Polar RZ & NRZ

 Bipolar NRZ

 ISI

 Pulse shaping

 Correlative coding

 Eye pattern

 Equalization

Unit 4

 Geometric Representation of signals

 PSD and BER of Coherent BPSK

 BFSK and QPSK

 QAM

 structure of Non-coherent Receivers

 Principle of DPSK

Unit 5

 Channel coding theorem

 Hamming and Convolutional codes

 Vitterbi Decoder

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