Access DC Important Questions with syllabus 2024
Syllabus
UNIT I: PULSE DIGITAL MODULATION
Elements of digital communication systems, advantages of digital communication systems, Elements of PCM: Sampling, Quantization & Coding, Quantization error, Companding in PCM systems. Differential PCM systems (DPCM), Delta modulation, its draw backs, adaptive delta modulation, comparison of PCM and DM systems, noise in PCM and DM systems
UNIT II: DIGITALMODULATIONTECHNIQUES
Introduction,ASK,FSK,PSK,DPSK,DEPSK,QPS K,M-aryPSK,ASK,FSK,similarity of BFSK and BPSK.
UNIT III: DATA TRANSMISSION
Base band signal receiver, probability of error, the optimum filter, matched filter, probability of error using matched filter,coherentreception,noncoherentdetectionofFSK,calculationoferrorprobabilityofASK,BPSK,BFSK,QPSK.
UNIT IV: INFORMATION THEORY
Discrete messages, concept of amount of information and its properties. Average information, Entropy and its properties, Information rate, Mutual information and its properties SOURCECODING:Introductions,Advantages,Shannon’stheorem,ShanonFanocoding,Huffman coding, efficiency calculations, channel capacity of discrete and analog Channels, capacity of a Gaussian channel, bandwidth–S/N trade off.
UNIT V: LINEAR BLOCKCODES
Introduction, Matrix description of Linear Block codes, Error detection and error correction capabilities of Linear block codes, Hamming codes, Binary cyclic codes, Algebraic structure, encoding, syndrome calculation, BCH Codes. CONVOLUTIONCODES: Introduction, encoding of convolution codes, time domain approach, transform domain approach. Graphical approach: state, tree and trellisdiagramde coding using Viterbi algorithm.
DC Important Questions with syllabus 2024
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