Degrees of Freedom of MIMO Multiway Relay Channels Using Distributed Interference Neutralization and Retransmission

Bowei ZHANG; Wenjiang FENG; Qian XIAO; Luran LV; Zhiming WANG

doi:10.1587/transcom.2016EBP3199

Degrees of Freedom of MIMO Multiway Relay Channels Using Distributed Interference Neutralization and Retransmission

Bowei ZHANG, Wenjiang FENG, Qian XIAO, Luran LV, Zhiming WANG

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In this paper, we study the degrees of freedom (DoF) of a multiple-input multiple-output (MIMO) multiway relay channel (mRC) with two relays, two clusters and K (K≥3) users per cluster. We consider a clustered full data exchange model, i.e., each user in a cluster sends a multicast (common) message to all other users in the same cluster and desires to acquire all messages from them. The DoF results of the mRC with the single relay have been reported. However, the DoF achievability of the mRC with multiple relays is still an open problem. Furthermore, we consider a more practical scenario where no channel state information at the transmitter (CSIT) is available to each user. We first give a DoF cut-set upper bound of the considered mRC. Then, we propose a distributed interference neutralization and retransmission scheme (DINR) to approach the DoF cut-set upper bound. In the absence of user cooperation, this method focuses on the beamforming matrix design at each relay. By investigating channel state information (CSI) acquisition, we show that the DINR scheme can be performed by distributed processing. Theoretical analyses and numerical simulations show that the DoF cut-set upper bound can be attained by the DINR scheme. It is shown that the DINR scheme can provide significant DoF gain over the conventional time division multiple access (TDMA) scheme. In addition, we show that the DINR scheme is superior to the existing single relay schemes for the considered mRC.

Publication: IEICE TRANSACTIONS on Communications Vol.E100-B No.2 pp.269-279

Publication Date: 2017/02/01

Publicized: 2016/08/09

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2016EBP3199

Type of Manuscript: PAPER

Category: Fundamental Theories for Communications

Authors

Bowei ZHANG
  Chongqing University
Wenjiang FENG
  Chongqing University
Qian XIAO
  Chongqing University
Luran LV
  Chongqing University
Zhiming WANG
  Chongqing University

Keyword

multiway relay channels, degrees of freedom, network coding, signal space alignment, interference neutralization

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Bowei ZHANG, Wenjiang FENG, Qian XIAO, Luran LV, Zhiming WANG, "Degrees of Freedom of MIMO Multiway Relay Channels Using Distributed Interference Neutralization and Retransmission" in IEICE TRANSACTIONS on Communications, vol. E100-B, no. 2, pp. 269-279, February 2017, doi: 10.1587/transcom.2016EBP3199.
Abstract: In this paper, we study the degrees of freedom (DoF) of a multiple-input multiple-output (MIMO) multiway relay channel (mRC) with two relays, two clusters and K (K≥3) users per cluster. We consider a clustered full data exchange model, i.e., each user in a cluster sends a multicast (common) message to all other users in the same cluster and desires to acquire all messages from them. The DoF results of the mRC with the single relay have been reported. However, the DoF achievability of the mRC with multiple relays is still an open problem. Furthermore, we consider a more practical scenario where no channel state information at the transmitter (CSIT) is available to each user. We first give a DoF cut-set upper bound of the considered mRC. Then, we propose a distributed interference neutralization and retransmission scheme (DINR) to approach the DoF cut-set upper bound. In the absence of user cooperation, this method focuses on the beamforming matrix design at each relay. By investigating channel state information (CSI) acquisition, we show that the DINR scheme can be performed by distributed processing. Theoretical analyses and numerical simulations show that the DoF cut-set upper bound can be attained by the DINR scheme. It is shown that the DINR scheme can provide significant DoF gain over the conventional time division multiple access (TDMA) scheme. In addition, we show that the DINR scheme is superior to the existing single relay schemes for the considered mRC.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.2016EBP3199/_p

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@ARTICLE{e100-b_2_269,
author={Bowei ZHANG, Wenjiang FENG, Qian XIAO, Luran LV, Zhiming WANG, },
journal={IEICE TRANSACTIONS on Communications},
title={Degrees of Freedom of MIMO Multiway Relay Channels Using Distributed Interference Neutralization and Retransmission},
year={2017},
volume={E100-B},
number={2},
pages={269-279},
abstract={In this paper, we study the degrees of freedom (DoF) of a multiple-input multiple-output (MIMO) multiway relay channel (mRC) with two relays, two clusters and K (K≥3) users per cluster. We consider a clustered full data exchange model, i.e., each user in a cluster sends a multicast (common) message to all other users in the same cluster and desires to acquire all messages from them. The DoF results of the mRC with the single relay have been reported. However, the DoF achievability of the mRC with multiple relays is still an open problem. Furthermore, we consider a more practical scenario where no channel state information at the transmitter (CSIT) is available to each user. We first give a DoF cut-set upper bound of the considered mRC. Then, we propose a distributed interference neutralization and retransmission scheme (DINR) to approach the DoF cut-set upper bound. In the absence of user cooperation, this method focuses on the beamforming matrix design at each relay. By investigating channel state information (CSI) acquisition, we show that the DINR scheme can be performed by distributed processing. Theoretical analyses and numerical simulations show that the DoF cut-set upper bound can be attained by the DINR scheme. It is shown that the DINR scheme can provide significant DoF gain over the conventional time division multiple access (TDMA) scheme. In addition, we show that the DINR scheme is superior to the existing single relay schemes for the considered mRC.},
keywords={},
doi={10.1587/transcom.2016EBP3199},
ISSN={1745-1345},
month={February},}

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TY - JOUR
TI - Degrees of Freedom of MIMO Multiway Relay Channels Using Distributed Interference Neutralization and Retransmission
T2 - IEICE TRANSACTIONS on Communications
SP - 269
EP - 279
AU - Bowei ZHANG
AU - Wenjiang FENG
AU - Qian XIAO
AU - Luran LV
AU - Zhiming WANG
PY - 2017
DO - 10.1587/transcom.2016EBP3199
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E100-B
IS - 2
JA - IEICE TRANSACTIONS on Communications
Y1 - February 2017
AB - In this paper, we study the degrees of freedom (DoF) of a multiple-input multiple-output (MIMO) multiway relay channel (mRC) with two relays, two clusters and K (K≥3) users per cluster. We consider a clustered full data exchange model, i.e., each user in a cluster sends a multicast (common) message to all other users in the same cluster and desires to acquire all messages from them. The DoF results of the mRC with the single relay have been reported. However, the DoF achievability of the mRC with multiple relays is still an open problem. Furthermore, we consider a more practical scenario where no channel state information at the transmitter (CSIT) is available to each user. We first give a DoF cut-set upper bound of the considered mRC. Then, we propose a distributed interference neutralization and retransmission scheme (DINR) to approach the DoF cut-set upper bound. In the absence of user cooperation, this method focuses on the beamforming matrix design at each relay. By investigating channel state information (CSI) acquisition, we show that the DINR scheme can be performed by distributed processing. Theoretical analyses and numerical simulations show that the DoF cut-set upper bound can be attained by the DINR scheme. It is shown that the DINR scheme can provide significant DoF gain over the conventional time division multiple access (TDMA) scheme. In addition, we show that the DINR scheme is superior to the existing single relay schemes for the considered mRC.
ER -