Comparison of Adaptive Lattice Filters to LMS Transversal Filters for SinusoidalCancellation

摘要

This paper compares the performance of the recursive least squares lattice (RLSL)and the normalized step-size stochastic gradient lattice (SGL) algorithms to that of the LMS transversal algorithm for the cancellation of sinusoidal interferences. It is found that adaptive lattice filters possess a number of advantages over the LMS transversal filter making them the preferred ANC filter structure if their increased computational costs can be tolerated. These advantages include faster convergence, notch bandwidths which are independent of the input power, and the generation of less harmonic distortion. The notch bandwidth of each filter structure is related to its respective convergence time constant. Experimental results obtained with the 32-bit floating-point Lattice Development System (LDS) are presented to verify our analytical results. submarine systems, adaptive signal processing, adaptive line enhancing, adaptive noise cancelling.