用拓扑方法量化深度学习无线接收机的抗环境变化能力,提前预警信号失真。
Resilience Characterization of AI-Native Wireless Receivers via Persistent Homology

- 基于持久同调构建拓扑鲁棒性指数(TRI),实时监测模型参数空间稳定性。
- 在10种信道切换场景中,比梯度幅值和验证损失提前超一个符号发出预警。
- 适合研究智能通信系统鲁棒性或部署自适应接收机的工程师参考。
基于深度学习的AI原生无线接收机在平稳信道下表现优异,但其对分布偏移的鲁棒性难以用传统比特误码率(BER)等指标准确刻画。本文提出一种新型实时度量——拓扑鲁棒性指数(TRI),基于持久同调与持久指数,量化神经网络接收机在非平稳信道在线适应过程中参数空间的结构稳定性。TRI从三个互补维度衡量:(i) 验证损失鲁棒性,反映模型与信道不匹配程度,基于损失景观子水平集的拓扑持久性;(ii) 信道冲激响应(CIR)分布偏移,追踪CIR向量相对于校准参考分布的几何漂移;(iii) 信道流形拓扑,通过归一化高斯核矩阵的谱隙(以Olivier-Ricci曲率范数为基准)进行量化。理论证明TRI有界、随性能下降单调递减,且在Wasserstein距离度量的信道分布扰动下具有Lipschitz稳定性。针对OFDM深度学习接收机在10个ITU-R跨环境转换、三种切换速率下的仿真结果显示,TRI相比梯度幅值和验证损失基线,平均提前超过一个OFDM符号发出预警,而后者在所有场景中预警延迟为零;此外,基于TRI引导的突发重适配可在200个OFDM符号内使后切换阶段的BER降低80%(相较无适应情况)。
原文摘要 · Abstract (English)
AI-native wireless receivers based on deep learning exhibit remarkable performance under stationary channel conditions, yet their resilience to distributional shifts remains poorly characterized by conventional metrics such as bit error rate (BER). To overcome these limitations, this paper proposes a novel real-time metric, the Topological Resilience Index (TRI), grounded in persistent homology and persistence exponents. TRI quantifies the structural stability of a neural network receiver's parameter space during online adaptation to non-stationary channels. Specifically, TRI captures resilience through three complementary dimensions: (i) validation-loss resilience measuring model-channel mismatch, grounded in the topological persistence of loss-landscape sublevel sets; (ii) channel impulse response (CIR) distribution shift, tracking geometric drift of CIR vectors from the calibration reference distribution; and (iii) channel manifold topology, quantified by the spectral gap of the Gaussian kernel matrix normalized by the Olivier-Ricci curvature norm. We establish theoretical guarantees showing that TRI is bounded, monotonic under performance degradation, and Lipschitz-stable with respect to perturbations in channel distributions measured in Wasserstein distance. Simulation results for an OFDM deep-learning receiver adapting across ten ITU-R inter-environment transitions at three shift rates demonstrate that TRI provides a consistent mean warning lead of more than one OFDM symbol over gradient-norm and validation-loss baselines, whereas the gradient-norm baseline achieves zero lead in every scenario. Furthermore, the proposed TRI-guided burst re-adaptation reduces post-shift BER by 80% relative to no adaptation within 200 OFDM symbols.
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