Online design of nonlinear inverse systems by adaptive Volterra filter

✍ Scribed by Yoshinobu Kajikawa; Yasuo Nomura

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 223 KB
• Volume: 83
• Category: Article
• ISSN: 1042-0967
• DOI: 10.1002/(sici)1520-6440(200009)83:9<46::aid-ecjc5>3.0.co;2-l

✦ Synopsis

In this paper, we propose an online design method of a nonlinear inverse system which eliminates the linear and nonlinear distortions of the nonlinear system at the same time. We discuss the online design method by using the adaptive Volterra filter. Although we have already proposed offline design methods, these had the problem that the elimination level of the nonlinear distortion degrades when the characteristics of the target nonlinear system vary. In this paper, we first show the effects of compensation of distortions due to the modeling error of each filter which composes a nonlinear inverse system. Next, the proposed online design method is explained by dividing it into three steps. In the first step, the online identification method of the first-order Volterra kernel is discussed. In the second step, the online design method of the linear inverse filter is discussed. In the third step, the online identification method of the second-order Volterra kernel is discussed. Finally, the effectiveness of the proposed method is shown by computer simulations.