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Linear system
From Wikipedia, the free encyclopedia
A linear system is a mathematical model of a system based on the use of a linear operator. Linear systems typically exhibit features and properties that are much simpler than the general, nonlinear case. As a mathematical abstraction or idealization, linear systems find important applications in automatic control theory, signal processing, and telecommunications. For example, the propagation medium for wireless communication systems can often be modeled by linear systems.
A general deterministic system can be described by operator H that maps an input x(t) as a function of t to an output y(t), a type of black box description. Linear systems satisfy the properties of superposition and scaling: given two valid inputs
as well as their respective outputs
then a linear system must satisfy
for any scalar values 
and 
.
The behavior of the resulting system subjected to a complex input can be described as a sum of responses to simpler inputs. In nonlinear systems, there is no such relation. This mathematical property makes the solution of modelling equations simpler than many nonlinear systems. For time-invariant systems this is the basis of the impulse response or the frequency response methods (see LTI system theory), which describe a general input function x(t) in terms of unit impulses or frequency components.
Typical differential equations of linear time-invariant systems are well adapted to analysis using the Laplace transform in the continuous case, and the Z-transform in the discrete case (especially in computer implementations).
Another perspective is that solutions to linear systems comprise a system of functions which act like vectors in the geometric sense.
A common use of linear models is to describe a nonlinear system by linearization. This is usually done for mathematical convenience.
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The time-varying impulse response h(t2,t1) of a linear system is defined as the response of the system at time t = t2 to a single impulse applied at time t = t1. In other words, if the input x(t) to a linear system is
where δ(t) represents the Dirac delta function, and the corresponding response y(t) of the system is
then the function h(t2,t1) is the time-varying impulse response of the system.
The output of any continuous time linear system is related to the input by the time-varying convolution integral:
or, equivalently,
where
represents the lag time between the stimulus at time s and the response at time t.
The output of any discrete time linear system is related to the input by the time-varying convolution sum:
![y[n] = \sum_{k=-\infty}^{\infty} { h[n,k] x[k] }](http://upload.wikimedia.org/math/0/6/8/0687338756ed6fb7869b659f41ab05f7.png)
or equivalently,
![y[n] = \sum_{m=-\infty}^{\infty} { h[n,n-m] x[n-m] }](http://upload.wikimedia.org/math/3/b/1/3b1a10182956883fd5876b69db5e1ee7.png)
where
represents the lag time between the stimulus at time k and the response at time n.
A linear system is causal if and only if the system's time varying impulse response is identically zero whenever the time t of the response is earlier than the time s of the stimulus. In other words, for a causal system, the following condition must hold:
- Linear system of divisors in algebraic geometry.
- LTI system theory
- System analysis
- System of linear equations
- Nonlinear system
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