how to find the bandwidth of a system?

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Sahar on 1 Apr 2015
Commented: Sahar on 9 Apr 2015
Hi. I have a MIMO system with 4 different transfer functions, I need to find the bandwidth of the system with MATLAB, I need it to generate a PRBS signal for system identification. can anyone give a hint or help?

Answers (1)

Christiaan on 2 Apr 2015
Edited: Christiaan on 2 Apr 2015
Dear Sarah,
To generate Pseudorandom Binary Sequence, please have a look at this Mathworks documatation.
To find the bandwidth of your system, you could have a look at the MATLAB function bandwidth. This function computes the bandwidth fb of the SISO dynamic system. Since you have a MIMO, you could first try to still apply this function for your system. If that doesn't work, you could also try to find for each transfer function the bandwidth and use the superpose principle to make a statement of the bandwidth of your total system.
Good Luck! Christiaan
  1 Comment
Sahar on 9 Apr 2015
Thanks Christiaan,
so by just typing "bandwidth(transferfunction_1)" in MATLAB; I get a number! what is this number exactly telling me? The problem is I have 4 heating circuits, heating up, I need to know the dominant time constant! to avoid burning the heating element. how do I find this? from bode plot? from MATLAB command "pole(transferfunction_1)" until 4, or from bandwidth?
Thanks, Sahar

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