A multi-beam feedback scheme using LASSO reconstruction on a near-field codebook achieves the same rate as DFT beam training with up to 95% less feedback overhead, plus an off-grid refinement that cuts reconstruction error by 69.4%.
Two-stage hierarchical beam training for near-field communications,
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Sparsity-Aware Near-Field Beam Training via Multi-Beam Combination
A multi-beam feedback scheme using LASSO reconstruction on a near-field codebook achieves the same rate as DFT beam training with up to 95% less feedback overhead, plus an off-grid refinement that cuts reconstruction error by 69.4%.