The concept of system, and its input and output signals, classification of systems and signals, linear time invariant systems and convolution theorem. System characterization by the impulse response, periodic signals and their Fourier series representation. Response of Linear time invariant systems to periodic input signals, Fourier transform, frequency response, and use of Fourier transform in system analysis. Applications of Fourier transform in communications. Sampling theorem, Laplace transform, Z-transform, Application of Laplace transform and z-transform in systems characterized by differential and difference equations. State space representation.

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