FDD Massive MIMO via UL/DL Channel Covariance Extrapolation and Active Channel Sparsification

• Published in: IEEE transactions on wireless communications Vol. 18; no. 1; pp. 121 - 135
• Main Authors: Barzegar Khalilsarai, Mahdi, Haghighatshoar, Saeid, Yi, Xinping, Caire, Giuseppe
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: active channel sparsification; Antennas; Carrier frequencies; Channel estimation; Coherence; Covariance matrix; Current carriers; downlink covariance estimation; FDD massive MIMO; Feedback; Frequency division duplexing; MIMO communication; Mixed integer; Pilot training; Pilots; Reciprocity; Scattering functions; State of the art; Training; Wireless communication

We propose a novel method for massive multiple-input multiple-output (massive MIMO) in frequency division duplexing (FDD) systems. Due to the large frequency separation between uplink (UL) and downlink (DL) in FDD systems, channel reciprocity does not hold. Hence, in order to provide DL channel stat...