Impact of Imperfect Channel State Information on Achievable Rate With Zero-Forcing Precoding in Massive MIMO Systems for Multi-Numerology

We have recently proposed a zero-forcing (ZF) precoding design for massive multiple-input multiple-output (MIMO) systems with multiple numerologies, which are promising communication systems employing distinct orthogonal frequency division multiplexing (OFDM) frame structures for simultaneously sati...

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Bibliographic Details
Main Authors: Son, Hyunsoo, Kwon, Girim, Park, Hyuncheol, Park, Joo Sung
Format: Conference Proceeding
Language:English
Subjects:
Channel estimation
Closed-form solutions
Imperfect CSI
Interference
Massive MIMO
Multi-numerology
OFDM
Precoding
Simulation
Zero-forcing precoding
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Summary:We have recently proposed a zero-forcing (ZF) precoding design for massive multiple-input multiple-output (MIMO) systems with multiple numerologies, which are promising communication systems employing distinct orthogonal frequency division multiplexing (OFDM) frame structures for simultaneously satisfying diverse requirements of user equipments (UEs). While the achievable rate with the ZF precoder is analyzed with perfect channel state information at the transmitter (CSIT) in the previous work, obtaining perfect CSIT is impractical in massive MIMO systems. The achievable rate with imperfect CSIT is investigated in this paper. We consider the ZF precoding constructed by using the estimated channels from uplink channel estimation in time division duplexing systems. Both the closed-form expression of the signal-to-interference-plus-noise ratio (SINR) and the lower bound (LB) of the ergodic achievable rate in the presence of imperfect CSIT are derived. It turns out that the LB converges to the LB provided in our previous work, which assumes perfect CSIT, as the pilot-to-noise ratio becomes infinity. Simulation results verify the tightness of the LB.
ISSN:2155-7586
DOI:10.1109/MILCOM58377.2023.10356334