CHARM extracts ADPS priors from path-level radio maps to reduce 3D angle-delay-AoD search to 1D AoD search per path, delivering 34.8x speedup over joint OMP at T≤4 pilots with comparable accuracy and only 3.7 dB degradation under 0.2 rad dictionary mismatch via trust-region constraint.
MIMO channel estimation method using ray-tracing propagation model
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