Achievable DoF for 2-user MIMO relay interference channels with outdated channel state information

Haobo Liang; Roger S. Cheng

doi:10.1109/WCNC.2017.7925968

Achievable DoF for 2-user MIMO relay interference channels with outdated channel state information

Haobo Liang
, Roger S. Cheng

Department of Electronic and Computer Engineering

Research output: Chapter in Book/Conference Proceeding/Report › Conference Paper published in a book › peer-review

1 Citation (Scopus)

Abstract

In this paper, we investigate the achievable degree of freedom (DoF) of a fully connected 2-user multiple- input multiple-output (MIMO) relay interference channel with M antennas at each transmitter and N antennas at each receiver when channel state information (CSI) is not available at transmitters and a delayed version of the CSI of direct links from the transmitters to the receivers is known at the relay. We propose a two-phase transmission scheme and obtain different sum-DoF gains (inner bound) under various configurations. We found the achievable sum-DoF values for different antenna configurations at the relay node for the MIMO relay interference channels. The results show that if the relay node has more than 2M antennas, our proposed scheme can achieve the outer bound when the instantaneously CSI is known at the relay and at the receivers. This result implies that with the help of a relay with enough antennas, the requirement for instantaneous CSI can be relaxed to the delayed CSI. Moreover, when compared to the MIMO interference channel with no relay, the presence of relay with delayed global CSI can boost the DoF performance even when there is no CSI at the transmitters.

Original language	English
Title of host publication	2017 IEEE Wireless Communications and Networking Conference, WCNC 2017 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781509041831
DOIs	https://doi.org/10.1109/WCNC.2017.7925968
Publication status	Published - 10 May 2017
Event	2017 IEEE Wireless Communications and Networking Conference, WCNC 2017 - San Francisco, United States Duration: 19 Mar 2017 → 22 Mar 2017

Publication series

Name	IEEE Wireless Communications and Networking Conference, WCNC
ISSN (Print)	1525-3511

Conference

Conference	2017 IEEE Wireless Communications and Networking Conference, WCNC 2017
Country/Territory	United States
City	San Francisco
Period	19/03/17 → 22/03/17

Bibliographical note

Publisher Copyright:
© 2017 IEEE.

Access to Document

10.1109/WCNC.2017.7925968

Cite this

Liang, H., & Cheng, R. S. (2017). Achievable DoF for 2-user MIMO relay interference channels with outdated channel state information. In 2017 IEEE Wireless Communications and Networking Conference, WCNC 2017 - Proceedings Article 7925968 (IEEE Wireless Communications and Networking Conference, WCNC). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/WCNC.2017.7925968

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abstract = "In this paper, we investigate the achievable degree of freedom (DoF) of a fully connected 2-user multiple- input multiple-output (MIMO) relay interference channel with M antennas at each transmitter and N antennas at each receiver when channel state information (CSI) is not available at transmitters and a delayed version of the CSI of direct links from the transmitters to the receivers is known at the relay. We propose a two-phase transmission scheme and obtain different sum-DoF gains (inner bound) under various configurations. We found the achievable sum-DoF values for different antenna configurations at the relay node for the MIMO relay interference channels. The results show that if the relay node has more than 2M antennas, our proposed scheme can achieve the outer bound when the instantaneously CSI is known at the relay and at the receivers. This result implies that with the help of a relay with enough antennas, the requirement for instantaneous CSI can be relaxed to the delayed CSI. Moreover, when compared to the MIMO interference channel with no relay, the presence of relay with delayed global CSI can boost the DoF performance even when there is no CSI at the transmitters.",

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Liang, H & Cheng, RS 2017, Achievable DoF for 2-user MIMO relay interference channels with outdated channel state information. in 2017 IEEE Wireless Communications and Networking Conference, WCNC 2017 - Proceedings., 7925968, IEEE Wireless Communications and Networking Conference, WCNC, Institute of Electrical and Electronics Engineers Inc., 2017 IEEE Wireless Communications and Networking Conference, WCNC 2017, San Francisco, United States, 19/03/17. https://doi.org/10.1109/WCNC.2017.7925968

Achievable DoF for 2-user MIMO relay interference channels with outdated channel state information. / Liang, Haobo; Cheng, Roger S.
2017 IEEE Wireless Communications and Networking Conference, WCNC 2017 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2017. 7925968 (IEEE Wireless Communications and Networking Conference, WCNC).

Research output: Chapter in Book/Conference Proceeding/Report › Conference Paper published in a book › peer-review

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N2 - In this paper, we investigate the achievable degree of freedom (DoF) of a fully connected 2-user multiple- input multiple-output (MIMO) relay interference channel with M antennas at each transmitter and N antennas at each receiver when channel state information (CSI) is not available at transmitters and a delayed version of the CSI of direct links from the transmitters to the receivers is known at the relay. We propose a two-phase transmission scheme and obtain different sum-DoF gains (inner bound) under various configurations. We found the achievable sum-DoF values for different antenna configurations at the relay node for the MIMO relay interference channels. The results show that if the relay node has more than 2M antennas, our proposed scheme can achieve the outer bound when the instantaneously CSI is known at the relay and at the receivers. This result implies that with the help of a relay with enough antennas, the requirement for instantaneous CSI can be relaxed to the delayed CSI. Moreover, when compared to the MIMO interference channel with no relay, the presence of relay with delayed global CSI can boost the DoF performance even when there is no CSI at the transmitters.

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Liang H, Cheng RS. Achievable DoF for 2-user MIMO relay interference channels with outdated channel state information. In 2017 IEEE Wireless Communications and Networking Conference, WCNC 2017 - Proceedings. Institute of Electrical and Electronics Engineers Inc. 2017. 7925968. (IEEE Wireless Communications and Networking Conference, WCNC). doi: 10.1109/WCNC.2017.7925968

Achievable DoF for 2-user MIMO relay interference channels with outdated channel state information

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