提出新型分布式降噪算法,有效应对节点串扰与通信延迟问题。
Mixed-gradients Distributed Filtered Reference Least Mean Square Algorithm -- A Robust Distributed Multichannel Active Noise Control Algorithm
- 用本地梯度替代控制滤波器传输信息,提升系统灵活性与安全性。
- 在多种通信延迟下性能接近集中式方法,验证了算法鲁棒性。
- 自动缩小步长策略增强抗延迟能力,适合实际分布式场景使用。
分布式多通道主动降噪(DMCANC)通过多个独立处理器实现与传统集中式多通道主动降噪(MCANC)相当的全局降噪效果,因其高计算效率而备受关注。然而,现有大多数DMCANC算法忽略节点间串扰影响,并假设网络无通信限制,这一假设不切实际。为此,本文提出一种鲁棒的DMCANC算法,利用补偿滤波器缓解串扰影响。该方案通过采用本地梯度而非本地控制滤波器传递增强信息,构建混合梯度分布式滤波参考最小均方(MGDFxLMS)算法,提升了系统的灵活性与安全性。性能分析表明,该方法在性能上可媲美集中式方案。此外,为应对分布式网络中的通信延迟问题,引入一种自适应缩小步长策略,根据延迟样本动态调整步长,以增强系统鲁棒性。数值仿真结果证实,所提出的自缩步长MGDFxLMS(ASSS-MGDFxLMS)算法在不同通信延迟条件下均表现优异,凸显其实际应用价值。
原文摘要 · Abstract (English)
Distributed multichannel active noise control (DMCANC), which utilizes multiple individual processors to achieve a global noise reduction performance comparable to conventional centralized multichannel active noise control (MCANC), has become increasingly attractive due to its high computational efficiency. However, the majority of current DMCANC algorithms disregard the impact of crosstalk across nodes and impose the assumption of an ideal network devoid of communication limitations, which is an unrealistic assumption. Therefore, this work presents a robust DMCANC algorithm that employs the compensating filter to mitigate the impact of crosstalk. The proposed solution enhances the DMCANC system's flexibility and security by utilizing local gradients instead of local control filters to convey enhanced information, resulting in a mixed-gradients distributed filtered reference least mean square (MGDFxLMS) algorithm. The performance investigation demonstrates that the proposed approach performs well with the centralized method. Furthermore, to address the issue of communication delay in the distributed network, a practical strategy that auto-shrinks the step size value in response to the delayed samples is implemented to improve the system's resilience. The numerical simulation results demonstrate the efficacy of the proposed auto-shrink step size MGDFxLMS (ASSS-MGDFxLMS) algorithm across various communication delays, highlighting its practical value.
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