This is an introductory course in the field of communication engineering. It provides basic concepts of signals and systems and how different operations is done on the elementary signals. Students will learn to determine output of LTI system using the technique of convolution. They will get an insight of frequency domain techniques for analysis and manipulation of continuous time signals. Students will learn to determine fourier series coefficient and fourier transform of periodic and aperiodic time domain signals. This learning is also extended to laplace transform. Using these frequency domain techniques students will be able to design and analyze different types of systems.