DIGITAL COMMUNICATION

DIGITAL COMMUNICATION

OBJECTIVES:

•  To know the principles of sampling & quantization
•  To study the various waveform coding schemes
•  To learn the various baseband transmission schemes
•  To understand the various Band pass signaling schemes
•  To know the fundamentals of channel coding

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 9 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 - 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 - Vitterbi Decoder
                                                                                                                          TOTAL: 45 PERIODS 
OUTCOMES: 
Upon completion of the course, students will be able to

•  Design PCM systems
•  Design and implement base band transmission schemes
•  Design and implement band pass signaling schemes
•  Analyze the spectral characteristics of band pass signaling schemes and their noise  performance
•  Design error control coding schemes

TEXT BOOK:
1. S. Haykin, “Digital Communications”, John Wiley, 2005

REFERENCES:
1. B. Sklar, “Digital Communication Fundamentals and Applications”, 2nd Edition, Pearson Education, 2009
2. B.P.Lathi, “Modern Digital and Analog Communication Systems” 3rd Edition, Oxford University Press 2007.
3. H P Hsu, Schaum Outline Series - “Analog and Digital Communications”, TMH 2006
4. J.G Proakis, “Digital Communication”, 4th Edition, Tata Mc Graw Hill Company, 2001.