Regularized Zero-Forcing Precoder for Massive MIMO System With Transceiver I/Q Imbalances

In this letter, we propose a downlink precoder for massive multi-input multi-output (MIMO) system in the presence of I/Q imbalance (IQI) at both base station and user terminals (UTs). We formulate a minimum mean-square error (MMSE) precoding problem with multiple regularization parameters for differ...

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Published in:IEEE wireless communications letters Vol. 8; no. 4; pp. 1028 - 1031
Main Authors: Jee, Jeongju, Kwon, Girim, Park, Hyuncheol
Format: Journal Article
Language:English
Published: Piscataway IEEE 01.08.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Antennas
Asymptotic properties
Correlation
Downlink
Hardware
I/Q imbalance
massive MIMO
MIMO (control systems)
MIMO communication
Precoding
Regularization
regularized zero-forcing precoding
Transceivers
ISSN:2162-2337, 2162-2345
Online Access:Get full text
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Abstract In this letter, we propose a downlink precoder for massive multi-input multi-output (MIMO) system in the presence of I/Q imbalance (IQI) at both base station and user terminals (UTs). We formulate a minimum mean-square error (MMSE) precoding problem with multiple regularization parameters for different channel qualities and channel correlations of UTs with different IQIs. Then we obtain the asymptotically optimal precoding matrix for the massive MIMO system. Moreover, we derive the asymptotic sum rate of the proposed regularized zero-forcing (RZF) precoder. We show that the proposed RZF precoder achieves significantly higher sum rate than conventional RZF precoder. In addition, the proposed precoder shows robust performances to severe IQI conditions.
AbstractList In this letter, we propose a downlink precoder for massive multi-input multi-output (MIMO) system in the presence of I/Q imbalance (IQI) at both base station and user terminals (UTs). We formulate a minimum mean-square error (MMSE) precoding problem with multiple regularization parameters for different channel qualities and channel correlations of UTs with different IQIs. Then we obtain the asymptotically optimal precoding matrix for the massive MIMO system. Moreover, we derive the asymptotic sum rate of the proposed regularized zero-forcing (RZF) precoder. We show that the proposed RZF precoder achieves significantly higher sum rate than conventional RZF precoder. In addition, the proposed precoder shows robust performances to severe IQI conditions.
Author Kwon, Girim
Jee, Jeongju
Park, Hyuncheol
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Cites_doi 10.1049/iet-com.2008.0249
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10.1109/TWC.2010.092810.091092
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10.1109/JSTSP.2009.2020325
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Snippet In this letter, we propose a downlink precoder for massive multi-input multi-output (MIMO) system in the presence of I/Q imbalance (IQI) at both base station...
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SubjectTerms Antennas
Asymptotic properties
Correlation
Downlink
Hardware
I/Q imbalance
massive MIMO
MIMO (control systems)
MIMO communication
Precoding
Regularization
regularized zero-forcing precoding
Transceivers
Title Regularized Zero-Forcing Precoder for Massive MIMO System With Transceiver I/Q Imbalances
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https://www.proquest.com/docview/2278395364
Volume 8
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