DC (B-TECH Electronics and Communication Engineering 6th)

Digital Transmission:

Introduction, Advantages of Digital Transmission, Pulse Code

Modulation; PCM Sampling, Sampling Rate, Aliasing, quantisation 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.

Digital Carrier Line Encoding & Multiplexing Techniques: Line Coding & its properties.

NRZ & RZ types, signalling format for unipolar, Polar, bipolar (AMI) & Manchester coding and

their power spectra (No derivation), HDB and B8ZS signalling, Fundamentals of time division

multiplexing, T1 Digital Carrier system, Synchronization and Signaling of T1, TDM, PCM

hierarchy, North-American Digital Hierarchy; T1 to T4 PCM TDM system (DS1 to DS4

signals), Bit versus word interleaving, Statistical TDM, Codecs & Combo Chips

Digital Carrier Modulation & Demodulation Techniques: Introduction, Information

capacity, Shannon Limit for Information capacity, Bit Rate, Baud & M-Ary Encoding,

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 e.g. 8 PSK & 16 PSK, Quadrature Amplitude Modulation (QAM);

8 QAM & 16 QAM 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)

Simulation of above systems using ComSim and Matlab.