EC8501 Digital Communication (DC)

             


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Important questions 
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EC8501 Digital Communication (DC)

Unit 1
1.Source coding theorem –,Shannon ,Fano & Huffman codes**
(or)
2.Information, Entropy, Mutual Information
Unit 2
PSD OF  NRZ & RZ (1 BIPOLAR 2 MANCHESTER  3UNIPOLAR)
or 
4.ADPCM or ADM full  topic
Unit 3
1Pulse shaping Correlative coding
2 ISI 
3 EYE DIAGRAM **
RAre
4.Nyquist criterion for distortion less transmission
UNIT 4
BPSK 
QPSK 
BFSK  
ALL ARE WITH BER CALCULATIONS 
UNIT 5 
1,LINEAR BLOCK CODE 
2, CYCLIC CODE 
3, CONVOLUTION & VITTERBY **

4, CHANNEL CODING  THEROM**

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**Very important questions are bolded and may be asked based on this topic

PART-C

1.Compulsory Questions {a case study where the student will have to read and analyse the subject }
mostly asked from unit 2, 5(OR) a situation given and you have to answer on your own

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Contact uS for more updates *These questions are expected for the exams This may or may not be asked for exams
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SYllabuS

UNIT I INFORMATION THEORY
Discrete Memoryless source, Information, Entropy, Mutual Information – Discrete Memoryless channels – Binary Symmetric Channel, Channel Capacity – Hartley – Shannon law – Source coding theorem – Shannon – Fano & Huffman codes.
UNIT II WAVEFORM CODING & REPRESENTATION
Prediction filtering and DPCM – Delta Modulation – ADPCM & ADM principles-Linear Predictive Coding- Properties of Line codes- Power Spectral Density of Unipolar / Polar RZ & NRZ – Bipolar NRZ – Manchester
UNIT III BASEBAND TRANSMISSION & RECEPTION
ISI – Nyquist criterion for distortion less transmission – Pulse shaping – Correlative coding – Eye pattern – Receiving Filters- Matched Filter, Correlation receiver, Adaptive Equalization UNIT IV DIGITAL MODULATION SCHEME
Geometric Representation of signals – Generation, detection, PSD & BER of Coherent BPSK, BFSK & QPSK – QAM – Carrier Synchronization – 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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