Near-field channel estimation is recast as multidimensional polynomial phase estimation via spherical wavefront parameterization, enabling a new estimator with improved accuracy-complexity performance.
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A constrained MLE recovers the downlink channel from PMI-only feedback in FDD MIMO and attains the Cramér-Rao bound asymptotically with sharp O(1/T) local excess-risk rates under identifiability conditions.
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Near-field channel estimation via wavefront parameterization
Near-field channel estimation is recast as multidimensional polynomial phase estimation via spherical wavefront parameterization, enabling a new estimator with improved accuracy-complexity performance.
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Downlink Channel Matrix Estimation from PMI-Only Feedback in FDD Systems: Maximum Likelihood and Sharp Excess Risk Bound
A constrained MLE recovers the downlink channel from PMI-only feedback in FDD MIMO and attains the Cramér-Rao bound asymptotically with sharp O(1/T) local excess-risk rates under identifiability conditions.