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Estimation of Broadband Multiuser Millimeter Wave Massive MIMO-OFDM Channels by Exploiting Their Sparse Structure
IEEE Transactions on Wireless Communications
In millimeter wave (mmWave) massive multipleinput multiple-output (MIMO) systems, acquiring accurate channel state information is essential for efficient beamforming (BF) and multiuser interference cancellation, which is a challenging task since a low signal-to-noise ratio is encountered before BF in large antenna arrays. The mmWave channel exhibits a 3-D clustered structure in the virtual angle of arrival (AOA), angle of departure (AOD) and delay domain that is imposed by the effect of powerdoi:10.1109/twc.2018.2818142 fatcat:qcvuev6sn5gnxeyslzfelid5b4