LMIs in Control/pages/Discrete-Time H2 Norm

Discrete-Time H2 Norm

A discrete time system operates on a discrete time signal input and produces a discrete time signal output. They are used in digital signal processing, such as digital filters for images or sound. The class of discrete time systems that are both linear and time invariant, known as discrete time LTI systems.

Discrete-Time LTI systems' H2 norm can be found by solving a LMI.

The SystemEdit

Discrete-Time LTI System with state space realization  
 

The DataEdit

The matrices: System  .

The Optimization ProblemEdit

The following feasibility problem should be optimized:

  is minimized while obeying the LMI constraints.

The LMI:Edit

Discrete-Time Bounded Real Lemma

The LMI formulation

H2 norm <  

 

Conclusion:Edit

The H2 norm is the minimum value of  that satisfies the LMI condition.

ImplementationEdit

A link to CodeOcean or other online implementation of the LMI
MATLAB Code

Related LMIsEdit

[1] - Continuous time H2 norm.

External LinksEdit

A list of references documenting and validating the LMI.

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