Optimal Leak Factor Selection for the Output-Constrained Leaky Filtered-Input Least Mean Square Algorithm

• Published in: IEEE signal processing letters Vol. 26; no. 5; pp. 670 - 674
• Main Authors: Shi, Dongyuan, Lam, Bhan, Gan, Woon-Seng, Wen, Shulin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.05.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active Noise Control; Algorithms; Attenuation; Broadband; Computer simulation; Distortion; leaky FxLMS; Narrowband; Noise control; Optimal control; Optimized production technology; Power generation; Saturation; Signal processing algorithms; White noise
• ISSN: 1070-9908; 1558-2361; 1558-2361
• DOI: 10.1109/LSP.2019.2903908

The leaky filtered-input least mean square (LFxLMS) algorithm is widely used in active noise control applications to minimize the degradation of attenuation performance due to output saturation distortion. However, the leak factor, which is critical in determining the steady-state error and robustness of the algorithm, is usually selected through trial and error. This letter proposes a leak factor selection approach, which ensures the LFxLMS algorithm converges to its optimal solution under the average-output-power constraint and can be readily derived in practice. Both broadband and narrowband cases are considered in the derivation without the independence assumption, and the simulations are conducted based on real primary and secondary paths to verify its effectiveness.