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arXiv · 2608.20693

A Regularized Block Diagonal RLS Algorithm for Acoustic Echo Cancellation

Ruibin Hou·Chenggang Zhang·Yufeng Diao
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Abstract

While the recursive least square (RLS) algorithm is widely used in adaptive filtering applications like acoustic echo cancellation (AEC) due to its fast convergence rate, its high computational complexity severely limit its practical deployment for long filters. In this paper, a regularized block-diagonal RLS (RBD-RLS) algorithm is proposed to address these challenges. By approximating the inverse covariance matrix as a block-diagonal structure, RBD-RLS simplifies the update process into independent parallel computations of sub-blocks, effectively reducing the computational complexity. Additionally, Tikhonov regularization is applied to each sub-blocks for enhance numerical stability. A series of experimental results demonstrate that RBD-RLS maintains good convergence while significantly reducing computational complexity. Moreover, it still exhibits relative robustness in real-world scenarios.

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Ruibin Hou, Chenggang Zhang, Yufeng Diao. 2026-08-21. A Regularized Block Diagonal RLS Algorithm for Acoustic Echo Cancellation. https://arxiv.org/abs/2608.20693

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