Model of a digital communication system, Representation of digital systems in time and frequency domain, Mixing process-Modulation, Basic principles of digital communications, Factors affecting system design, Channel capacity, Baseband data transmission, Intersymbol interference, Nyquist filters, Matched filters, Partial response signalling, Sources and examples of channel degradation, Distortion, Interference, Noise, Telephone and wireless channels, Bandpass digital modulation, Digital modulations, ASK-FSK-PSK, Multilevel digital modulation, Coding theory and practice, Multiple access schemes, FDMA, TDMA, CDMA.