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Table 1 Computational complexity of the LS-based and MMSE channel estimators .

From: Appropriate Algorithms for Estimating Frequency-Selective Rician Fading MIMO Channels and Channel Rice Factor: Substantial Benefits of Rician Model and Estimator Tradeoffs

Channel estimation algorithm Number of real multiplications Number of real additions Matrix inverse operation
LS, SLS No
SSLS No
MMSE ( = 0) Yes
General MMSE Yes