Uplink and Downlink MIMO-NOMA With Simultaneous Triangularization

In this paper, we consider the uplink and downlink precoder design for two-user power-domain multiple-input multiple-output (MIMO) non-orthogonal multiple access (NOMA) systems. We propose novel uplink and downlink precoding and detection schemes that lower the decoding complexity at the receiver by...

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Veröffentlicht in:	IEEE transactions on wireless communications Jg. 20; H. 6; S. 3381 - 3396
Hauptverfasser:	Krishnamoorthy, Aravindh, Schober, Robert
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	New York IEEE 01.06.2021 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:	Channels Codes Complexity Decoding Downlink Downlinking Ergodic processes linear algebra MIMO communication multiple access Multiple input multiple-output (MIMO) NOMA non-orthogonal multiple access (NOMA) Nonorthogonal multiple access Performance enhancement Precoding Resource management SISO (control systems) Time sharing Uplink Upper bounds
ISSN:	1536-1276, 1558-2248
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Abstract	In this paper, we consider the uplink and downlink precoder design for two-user power-domain multiple-input multiple-output (MIMO) non-orthogonal multiple access (NOMA) systems. We propose novel uplink and downlink precoding and detection schemes that lower the decoding complexity at the receiver by decomposing the MIMO-NOMA channels of the users into multiple single-input single-output (SISO)-NOMA channels via simultaneous triangularization (ST) of the MIMO channels of the users and low-complexity self-interference cancellation at the receivers. The proposed ST MIMO-NOMA schemes avoid channel inversion at transmitter and receiver and take advantage of the null spaces of the MIMO channels of the users, which is beneficial for the ergodic achievable rate performance. We characterize the maximum ergodic achievable rate regions of the proposed uplink and downlink ST MIMO-NOMA schemes, and compare them with respective upper bounds, baseline MIMO-NOMA schemes, and orthogonal multiple access (OMA). Our results illustrate that the proposed schemes significantly outperform the considered baseline MIMO-NOMA schemes and OMA, and have a small gap to the respective upper bounds for most channel conditions and user rates. Moreover, we show that a hybrid scheme, which performs time sharing between the proposed uplink and downlink ST MIMO-NOMA and single-user MIMO, can improve performance even further.
AbstractList	In this paper, we consider the uplink and downlink precoder design for two-user power-domain multiple-input multiple-output (MIMO) non-orthogonal multiple access (NOMA) systems. We propose novel uplink and downlink precoding and detection schemes that lower the decoding complexity at the receiver by decomposing the MIMO-NOMA channels of the users into multiple single-input single-output (SISO)-NOMA channels via simultaneous triangularization (ST) of the MIMO channels of the users and low-complexity self-interference cancellation at the receivers. The proposed ST MIMO-NOMA schemes avoid channel inversion at transmitter and receiver and take advantage of the null spaces of the MIMO channels of the users, which is beneficial for the ergodic achievable rate performance. We characterize the maximum ergodic achievable rate regions of the proposed uplink and downlink ST MIMO-NOMA schemes, and compare them with respective upper bounds, baseline MIMO-NOMA schemes, and orthogonal multiple access (OMA). Our results illustrate that the proposed schemes significantly outperform the considered baseline MIMO-NOMA schemes and OMA, and have a small gap to the respective upper bounds for most channel conditions and user rates. Moreover, we show that a hybrid scheme, which performs time sharing between the proposed uplink and downlink ST MIMO-NOMA and single-user MIMO, can improve performance even further.
Author	Krishnamoorthy, Aravindh Schober, Robert
Author_xml	– sequence: 1 givenname: Aravindh orcidid: 0000-0001-7186-121X surname: Krishnamoorthy fullname: Krishnamoorthy, Aravindh email: aravindh.krishnamoorthy@fau.de organization: Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany – sequence: 2 givenname: Robert surname: Schober fullname: Schober, Robert organization: Fraunhofer Institute for Integrated Circuits (IIS), Erlangen, Germany
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SubjectTerms	Channels Codes Complexity Decoding Downlink Downlinking Ergodic processes linear algebra MIMO communication multiple access Multiple input multiple-output (MIMO) NOMA non-orthogonal multiple access (NOMA) Nonorthogonal multiple access Performance enhancement Precoding Resource management SISO (control systems) Time sharing Uplink Upper bounds
Title	Uplink and Downlink MIMO-NOMA With Simultaneous Triangularization
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