Definition of Signals.
Sinusoid and the complex exponential signal.
Complex numbers and arithmetic.
Definition of systems, in both continuous- and discrete-time.
Simple signal manipulations: delay, amplification, time-reverse, addition.
Linearity and time-invariance.
Fundamental model of communication (XMTR -> Channel -> RCVR).
Themes, Signals Represent Information, Structure of Communication Systems, The Fundamental Signal, Complex numbers: definitions, addition, polar and Cartesian forms, Elemental Signals, Signal Decomposition
Introduction to Systems, Simple Systems
Problem Set I
1.1, 1.2, 2.1, 2.4, 2.6 (pdf)