Degrees of Freedom of the MIMO <I>K</I>-way Relay Channel with Fractional Signal Space Alignment

Bofeng YUAN; Xuewen LIAO; Xinmin LUO

doi:10.1587/transcom.E96.B.2281

Degrees of Freedom of the MIMO K-way Relay Channel with Fractional Signal Space Alignment

Bofeng YUAN, Xuewen LIAO, Xinmin LUO

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The multiple-input-multiple-output (MIMO) Gaussian wireless network with K users and an intermediate relay is investigated. In this network, each user with available local channel state information (CSI) intends to convey a multicast message to all other users while receiving all messages from other users via the relay. This model is termed the MIMO K-way relay channel with distributed CSI. For this channel, the sum capacity is shown as MK/(K-1)log(SNR)+o(SNR) where each user and the relay is equipped with M antennas. Achievability is based on the signal space alignment strategy with a K-1 time slot extension. A most general case is then considered, in which each user intends to recover all messages required within T time slots. We provide an improved scheme called fractional signal space alignment which achieves MK/(K-1) degrees of freedom in the general case and the feasibility condition is also explored.

Publication: IEICE TRANSACTIONS on Communications Vol.E96-B No.9 pp.2281-2292

Publication Date: 2013/09/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.E96.B.2281

Type of Manuscript: PAPER

Category: Wireless Communication Technologies

Authors

Bofeng YUAN
  Xi'an Jiaotong University
Xuewen LIAO
  Xi'an Jiaotong University
Xinmin LUO
  Xi'an Jiaotong University

Keyword

Degrees of freedom (DoF), interference alignment, multiple-input-multiple-output (MIMO), K-way relay channel, network coding

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Bofeng YUAN, Xuewen LIAO, Xinmin LUO, "Degrees of Freedom of the MIMO K-way Relay Channel with Fractional Signal Space Alignment" in IEICE TRANSACTIONS on Communications, vol. E96-B, no. 9, pp. 2281-2292, September 2013, doi: 10.1587/transcom.E96.B.2281.
Abstract: The multiple-input-multiple-output (MIMO) Gaussian wireless network with K users and an intermediate relay is investigated. In this network, each user with available local channel state information (CSI) intends to convey a multicast message to all other users while receiving all messages from other users via the relay. This model is termed the MIMO K-way relay channel with distributed CSI. For this channel, the sum capacity is shown as MK/(K-1)log(SNR)+o(SNR) where each user and the relay is equipped with M antennas. Achievability is based on the signal space alignment strategy with a K-1 time slot extension. A most general case is then considered, in which each user intends to recover all messages required within T time slots. We provide an improved scheme called fractional signal space alignment which achieves MK/(K-1) degrees of freedom in the general case and the feasibility condition is also explored.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.E96.B.2281/_p

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@ARTICLE{e96-b_9_2281,
author={Bofeng YUAN, Xuewen LIAO, Xinmin LUO, },
journal={IEICE TRANSACTIONS on Communications},
title={Degrees of Freedom of the MIMO K-way Relay Channel with Fractional Signal Space Alignment},
year={2013},
volume={E96-B},
number={9},
pages={2281-2292},
abstract={The multiple-input-multiple-output (MIMO) Gaussian wireless network with K users and an intermediate relay is investigated. In this network, each user with available local channel state information (CSI) intends to convey a multicast message to all other users while receiving all messages from other users via the relay. This model is termed the MIMO K-way relay channel with distributed CSI. For this channel, the sum capacity is shown as MK/(K-1)log(SNR)+o(SNR) where each user and the relay is equipped with M antennas. Achievability is based on the signal space alignment strategy with a K-1 time slot extension. A most general case is then considered, in which each user intends to recover all messages required within T time slots. We provide an improved scheme called fractional signal space alignment which achieves MK/(K-1) degrees of freedom in the general case and the feasibility condition is also explored.},
keywords={},
doi={10.1587/transcom.E96.B.2281},
ISSN={1745-1345},
month={September},}

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TY - JOUR
TI - Degrees of Freedom of the MIMO K-way Relay Channel with Fractional Signal Space Alignment
T2 - IEICE TRANSACTIONS on Communications
SP - 2281
EP - 2292
AU - Bofeng YUAN
AU - Xuewen LIAO
AU - Xinmin LUO
PY - 2013
DO - 10.1587/transcom.E96.B.2281
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E96-B
IS - 9
JA - IEICE TRANSACTIONS on Communications
Y1 - September 2013
AB - The multiple-input-multiple-output (MIMO) Gaussian wireless network with K users and an intermediate relay is investigated. In this network, each user with available local channel state information (CSI) intends to convey a multicast message to all other users while receiving all messages from other users via the relay. This model is termed the MIMO K-way relay channel with distributed CSI. For this channel, the sum capacity is shown as MK/(K-1)log(SNR)+o(SNR) where each user and the relay is equipped with M antennas. Achievability is based on the signal space alignment strategy with a K-1 time slot extension. A most general case is then considered, in which each user intends to recover all messages required within T time slots. We provide an improved scheme called fractional signal space alignment which achieves MK/(K-1) degrees of freedom in the general case and the feasibility condition is also explored.
ER -