MMSE channel estimation in holographic MIMO suffers large high-SNR losses when mutual coupling is ignored; LS estimation avoids this but needs high SNR.
Rayleigh fading model ing and channel hardening for reconfigurable intelligent surfaces,
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Exploiting Mutual Coupling Characteristics for Channel Estimation in Holographic MIMO
MMSE channel estimation in holographic MIMO suffers large high-SNR losses when mutual coupling is ignored; LS estimation avoids this but needs high SNR.