How to use 'idfrd' system object as a channel model in simulink

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Oscar - 2021-02-12T10:30:09+00:00
Question: How to use 'idfrd' system object as a channel model in simulink

I have created an idfrd object using measured frequency response data (using Magnitude/Angle measurements). Now I want to incorporate this data into a continuous time SISO model, which I can place as the channel between Tx/Rx in a communication system simulation. I have tried using 'LTI system' block from Control System Toolbox library, but it does not support idfrd system object. What can I do now? Is there any alternative way to address this issue? I am using Matlab/Simulink 2014a.

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    • Expert Answer

    Profile picture of John Williams John Williams answered . 2025-11-20

    You cannot do time domain simulation on a frequency response model. What you can do is fir a transfer function or state space model to match the measured frequency response. You can use commands tfest and ssest for that. Once you have a transfer function/state-space object, you'll be able to  simulate in  Simulink using LTI system block or just Transfer Function and State Space blocks.

     


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