DCS (B-TECH Electronics and Communication Engineering 5th)

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.