A double low-rank tensor decomposition method estimates angles, delays, Doppler shifts, and gains for circular RIS-aided mmWave MIMO-NOMA channels in mobility, with improved accuracy at low SNR.
On the uniqueness of multilinear decomposition of N-way arrays,
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Double Low-Rank 4D Tensor Decomposition for Circular RIS-Aided mmWave MIMO-NOMA System Channel Estimation in Mobility Scenarios
A double low-rank tensor decomposition method estimates angles, delays, Doppler shifts, and gains for circular RIS-aided mmWave MIMO-NOMA channels in mobility, with improved accuracy at low SNR.