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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Published in:IEEE transactions on wireless communications Vol. 20; no. 6; pp. 3381 - 3396
Main Authors: Krishnamoorthy, Aravindh, Schober, Robert
Format: Journal Article
Language:English
Published: New York IEEE 01.06.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
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
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  surname: Krishnamoorthy
  fullname: Krishnamoorthy, Aravindh
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  organization: Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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  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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