Uppsala University Department of Information Technology

Technical Report 2006-044

Comparison of Time Domain Maximum Likelihood Method and Sample Maximum Likelihood Method in Errors-in-Variables Identification

Mei Hong, Torsten Söderström, Johan Schoukens, and Rik Pintelon

September 2006

The time domain maximum likelihood (TML) method and the Sample Maximum Likelihood (SML) method are two general approaches for identifying errors-in-variables models. In the TML method, an important assumption is that the noise-free input signal must be a stationary process with rational spectrum. For SML, the noise-free input need to be periodic. In this report, numerical comparisons of these two methods are done under different situations. The results suggest that TML and SML have similar estimation accuracy at moderate or high signal-to-noise ratio (SNR).

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