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2

I assume you want to get a measure of "similarity" of the signal, in order to get a score of similarity between the measure and the reference. For measurements where there is no phase shift is not uncommon to use RMSE, MSE or MAE. MAE is the simplest of them all called "Mean Absolute Error": $$MAE = \frac{\displaystyle\sum_{i=0}^n \left| ...


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One way to look at it is to just find the difference (error): $$ e[n] = y_{\tt ref}[n] - y_{\tt meas}[n] $$ where $y_{\tt ref}$ is the reference signal and $y_{\tt meas}$ is the measured signal. Then one can look at this error signal, $e$, as an innovation process. If the innovation process is "white" (noise), then all the information in the ...


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