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Conditional LMMSE Channel Estimation for Multiple-Layer OFDMA Communications
Joohee Chae(채주희),Joon Ho Cho(조준호) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
In this paper, a conditional linear minimum mean-squared error (LMMSE) channel estimator is proposed for the uplink multiple-layer orthogonal frequency-division multiple-access (OFDMA) communications. It turns out that the estimator requires only the side information as the channel state information and the approximate side information can be easily obtained by using non-Bayesian channel estimates from multiple receive antennas. Simulation results show that the proposed channel estimator, which generates the Bayesian estimates with the help of non-Bayesian estimates, has a negligible performance degradation from the ideal conditional LMMSE estimators.