Deep Learning-Based Sparse Recovery and Dictionary Matching for Multipath Time Delay Estimation

Wireless channel responses contain rich multipath information, but accurately extracting this information remains challenging in complex indoor environments. In this letter, we propose a deep learning-based sparse recovery method for super-resolution multipath time delay estimation and dictionary mismatch mitigation in sparse modeling. The proposed DenoisingCNN framework recovers the sparse delay spectrum from the channel response with highly overlapping multipath components with three specialized modules to address dictionary mismatch. Numerical results demonstrate that the proposed method outperforms state-of-the-art approaches in the estimation of both the number and delays of the multipath components, offering robustness and strong generalization capabilities.