Comparison of Explicit CSI Feedback Schemes for 5G New Radio

Advanced multiple input multiple output (MIMO) technologies in New Radio (NR), such as multiple transmit-receive-point (multi-TRP) transmission or non-linear precoding are promising significant gains in data throughput for 5G NR, given that sufficient knowledge about the channel state information (CSI) is available at the gNB. This paper compares two practical explicit CSI feedback schemes, based on time domain compression and principal component analysis (PCA), against state-of-the-art CSI feedback from NR Rel. 15, NR type II CSI. A new method for feeding back the tap location information in the time domain compression scheme is proposed, which requires less feedback overhead compared to state-of-the-art methods.

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