This chapter covers a number of mathematical tools that can be used to characterize the various systems and subsystems encountered in simulation.
Many of the devices and subsystems involved in simulations of wireless communication systems can be characterized as linear systems; hence, many results from linear system theory prove very useful in simulation work.
A system H operating on an input signal x(t) to produce an output signal y(t) can be represented in mathematical notation as
y(t) = H[x(t)]
A system is ...