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.