Digital signaling formats and Power Spectra, Random Process, transmission of Random Processes and White Gaussian Noise (WGN) through Linear Systems, Signal-to-Noise Ratio (SNR) at the Input and Output of Low Pass Filter (LPF) and Matched Filter (MF), Information Theory, Entropy, Channel Capacity, Shannon Theorem and Applications, performance of Digital Communications Systems, Baseband Binary and Coherent and Non-coherent Communication Systems.