The Frequency Domain Decomposition (FDD) is an output-only system identification technique popular in civil engineering, in particular in structural health monitoring. As an output-only algorithm, it is useful when the input data is unknown. FDD is a modal analysis technique which generates a system realization using the frequency response given (multi-)output data [Reference: Wikipedia].
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Mohammad Farshchin (2021). Frequency Domain Decomposition (FDD) (https://www.mathworks.com/matlabcentral/fileexchange/50988-frequency-domain-decomposition-fdd), MATLAB Central File Exchange. Retrieved .
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