UNIT I: - Elements of Digital Communication System:-
Block diagram of Digital
Communication system, Digital representation of Analog signals, Advantages and
Disadvantages of Digital Communication system, Bandwidth -S/N trade off, Hartley
Shannon Law, Sampling theorem . Concept of amount of Information and entropy,
Shannon Fano Source Coding, Huffman source coding and Lampel-Ziv Source coding
algorithm.
UNIT-II: - Pulse Code Modulation:-
Sampling, Sampling Rate, Aliasing, quantization error,
Uniform and Non uniform quantization, Dynamic Range, Coding efficiency, A law & µ law
companding, Bandwidth of PCM, Block diagram of PCM system, Delta Modulation,
Continuously variable Slope Delta Modulator (CVSDM) or Adaptive Delta Modulation,
Differential Pulse Code Modulation, Intersymbol Interference, Eye Patterns, Signal power in
binary digital signals.
UNIT-III Line Coding & Multiplexing Techniques:
Line Coding & its properties.
NRZ & RZ types, signaling format for unipolar, Polar, bipolar (AMI) & Manchester
coding and their power spectra (No derivation), HDB and B8ZS signaling, Nyquist’s
criterions for pulse shaping, Fundamentals of time division multiplexing, Bit versus word
interleaving, Statistical TDM, Codecs & Combo Chips. Basics of TDMA, FDMA and
CDMA
UNIT-IV Digital Carrier Modulation & Demodulation Techniques
Introduction,
Amplitude Shift Keying (ASK), ASK Spectrum, ASK Modulator, Coherent ASK
Detector, Noncoherent ASK Detector, Frequency Shift Keying (FSK), FSK Bit Rate and
Baud, Bandwidth and Frequency Spectrum of FSK, FSK Transmitter, Non-coherent FSK
Detector, Coherent FSK Detector, FSK Detection Using PLL, Binary Phase Shift Keying,
Binary PSK Spectrum, BPSK Transmitter, Coherent PSK Detection, Quadrature Phase
Shift Keying (QPSK), QPSK Demodulator, Offset QPSK, π/4 QPSK, Comparison of
conventional QPSK, Offset QPSK and π/4 QPSK, M-Ary BPSK, Quadrature Amplitude
Modulation (QAM); MQAM transmitters and receivers, Band Width efficiency, Carrier
Recovery; Squaring Loop & Costas Loop, Differential PSK, DBPSK transmitter and
receiver, Constant Envelop Modulation; Minimum Shift Keying (MSK) & Gaussian
Minimum Shift Keying (GMSK ), matched filter receivers, bandwidth consideration and
probability of error calculations for ASK, PSK, FSK schemes.