Fast Identification of Wiener-Hammerstein Systems using Discrete Optimization
نویسندگان
چکیده
Introduction: Block-oriented structures are useful to model a nonlinear system. Applications range from RF amplifiers over chemical processes to physiological systems [1]. A block-oriented model consists of two types of blocks: Linear Time Invariant (LTI) and static nonlinear blocks. The most simple block-oriented model structures are the Wiener (a LTI block followed by a static nonlinear block) [1],[2] and the Hammerstein (static nonlinear block followed by a LTI block) [1],[3] model structure. A straightforward extension of the Wiener and the Hammerstein structure is the Wiener-Hammerstein structure. A Wiener-Hammerstein model structure (see Figure 1) is given by a static nonlinearity that is sandwiched in between two LTI blocks [1],[4],[5]. In this letter we assume that the output y(t) of a Wiener-Hammerstein system is given by:
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