Physically constrained unfolded multi-dimensional OMP for large MIMO systems
This work addresses channel estimation and localization problems in communication systems, but it appears incremental as it builds on existing unfolded and OMP methods.
The paper tackled the reliability and complexity challenges of sparse recovery methods in large MIMO systems by proposing MOMPnet, an unfolded framework that integrates deep unfolding with data-driven dictionary learning, resulting in strong performance on realistic channel data.
Sparse recovery methods are essential for channel estimation and localization in modern communication systems, but their reliability relies on accurate physical models, which are rarely perfectly known. Their computational complexity also grows rapidly with the dictionary dimensions in large MIMO systems. In this paper, we propose MOMPnet, a novel unfolded sparse recovery framework that addresses both the reliability and complexity challenges of traditional methods. By integrating deep unfolding with data-driven dictionary learning, MOMPnet mitigates hardware impairments while preserving interpretability. Instead of a single large dictionary, multiple smaller, independent dictionaries are employed, enabling a low-complexity multidimensional Orthogonal Matching Pursuit algorithm. The proposed unfolded network is evaluated on realistic channel data against multiple baselines, demonstrating its strong performance and potential.