Achievable Degrees of Freedom of MIMO Cellular Interfering Networks Using Interference Alignment

Bowei ZHANG; Wenjiang FENG; Le LI; Guoling LIU; Zhiming WANG

doi:10.1587/transcom.2016EBP3019

Achievable Degrees of Freedom of MIMO Cellular Interfering Networks Using Interference Alignment

Bowei ZHANG, Wenjiang FENG, Le LI, Guoling LIU, Zhiming WANG

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In this paper, we investigate the degrees of freedom (DoF) of a MIMO cellular interfering network (CIN) with L (L≥3) cells and K users per cell. Previous works established the DoF upper bound of LK(M+N)/(LK+1) for the MIMO CIN by analyzing the interference alignment (IA) feasibility, where M and N denote the number of antennas at each base station (BS) and each user, respectively. However, there is still a gap between the DoF upper bound and the achievable DoF in existing designs. To address this problem, we propose two linear IA schemes without symbol extensions to jointly design transmit and receive beamforming matrices to align and eliminate interference. In the two schemes, the transmit beamforming vectors are allocated to different cluster structures so that the inter-cell interference (ICI) data streams from different ICI channels are aligned. The first scheme, named fixed cluster structure (FCS-IA) scheme, allocates ICI beamforming vectors to the cluster structures of fixed dimension and can achieve the DoF upper bound under some system configurations. The second scheme, named dynamic cluster structure IA (DCS-IA) scheme, allocates ICI beamforming vectors to the cluster structures of dynamic dimension and can get a tradeoff between the number of antennas at BSs and users so that ICI alignment can be applied under various system configurations. Through theoretical analysis and numerical simulations, we verify that the DoF upper bound can be achieved by using the FCS-IA scheme. Furthermore, we show that the proposed schemes can provide significant performance gain over the time division multiple access (TDMA) scheme in terms of DoF. From the perspective of DoF, it is shown that the proposed schemes are more effective than the conventional IA schemes for the MIMO CIN.

Publication: IEICE TRANSACTIONS on Communications Vol.E99-B No.12 pp.2600-2613

Publication Date: 2016/12/01

Publicized: 2016/07/05

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2016EBP3019

Type of Manuscript: PAPER

Category: Wireless Communication Technologies

Authors

Bowei ZHANG
  Chongqing University
Wenjiang FENG
  Chongqing University
Le LI
  Chongqing University
Guoling LIU
  Chongqing University
Zhiming WANG
  Chongqing University

Keyword

cellular interfering networks, degrees of freedom, interference alignment

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Bowei ZHANG, Wenjiang FENG, Le LI, Guoling LIU, Zhiming WANG, "Achievable Degrees of Freedom of MIMO Cellular Interfering Networks Using Interference Alignment" in IEICE TRANSACTIONS on Communications, vol. E99-B, no. 12, pp. 2600-2613, December 2016, doi: 10.1587/transcom.2016EBP3019.
Abstract: In this paper, we investigate the degrees of freedom (DoF) of a MIMO cellular interfering network (CIN) with L (L≥3) cells and K users per cell. Previous works established the DoF upper bound of LK(M+N)/(LK+1) for the MIMO CIN by analyzing the interference alignment (IA) feasibility, where M and N denote the number of antennas at each base station (BS) and each user, respectively. However, there is still a gap between the DoF upper bound and the achievable DoF in existing designs. To address this problem, we propose two linear IA schemes without symbol extensions to jointly design transmit and receive beamforming matrices to align and eliminate interference. In the two schemes, the transmit beamforming vectors are allocated to different cluster structures so that the inter-cell interference (ICI) data streams from different ICI channels are aligned. The first scheme, named fixed cluster structure (FCS-IA) scheme, allocates ICI beamforming vectors to the cluster structures of fixed dimension and can achieve the DoF upper bound under some system configurations. The second scheme, named dynamic cluster structure IA (DCS-IA) scheme, allocates ICI beamforming vectors to the cluster structures of dynamic dimension and can get a tradeoff between the number of antennas at BSs and users so that ICI alignment can be applied under various system configurations. Through theoretical analysis and numerical simulations, we verify that the DoF upper bound can be achieved by using the FCS-IA scheme. Furthermore, we show that the proposed schemes can provide significant performance gain over the time division multiple access (TDMA) scheme in terms of DoF. From the perspective of DoF, it is shown that the proposed schemes are more effective than the conventional IA schemes for the MIMO CIN.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.2016EBP3019/_p

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@ARTICLE{e99-b_12_2600,
author={Bowei ZHANG, Wenjiang FENG, Le LI, Guoling LIU, Zhiming WANG, },
journal={IEICE TRANSACTIONS on Communications},
title={Achievable Degrees of Freedom of MIMO Cellular Interfering Networks Using Interference Alignment},
year={2016},
volume={E99-B},
number={12},
pages={2600-2613},
abstract={In this paper, we investigate the degrees of freedom (DoF) of a MIMO cellular interfering network (CIN) with L (L≥3) cells and K users per cell. Previous works established the DoF upper bound of LK(M+N)/(LK+1) for the MIMO CIN by analyzing the interference alignment (IA) feasibility, where M and N denote the number of antennas at each base station (BS) and each user, respectively. However, there is still a gap between the DoF upper bound and the achievable DoF in existing designs. To address this problem, we propose two linear IA schemes without symbol extensions to jointly design transmit and receive beamforming matrices to align and eliminate interference. In the two schemes, the transmit beamforming vectors are allocated to different cluster structures so that the inter-cell interference (ICI) data streams from different ICI channels are aligned. The first scheme, named fixed cluster structure (FCS-IA) scheme, allocates ICI beamforming vectors to the cluster structures of fixed dimension and can achieve the DoF upper bound under some system configurations. The second scheme, named dynamic cluster structure IA (DCS-IA) scheme, allocates ICI beamforming vectors to the cluster structures of dynamic dimension and can get a tradeoff between the number of antennas at BSs and users so that ICI alignment can be applied under various system configurations. Through theoretical analysis and numerical simulations, we verify that the DoF upper bound can be achieved by using the FCS-IA scheme. Furthermore, we show that the proposed schemes can provide significant performance gain over the time division multiple access (TDMA) scheme in terms of DoF. From the perspective of DoF, it is shown that the proposed schemes are more effective than the conventional IA schemes for the MIMO CIN.},
keywords={},
doi={10.1587/transcom.2016EBP3019},
ISSN={1745-1345},
month={December},}

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TY - JOUR
TI - Achievable Degrees of Freedom of MIMO Cellular Interfering Networks Using Interference Alignment
T2 - IEICE TRANSACTIONS on Communications
SP - 2600
EP - 2613
AU - Bowei ZHANG
AU - Wenjiang FENG
AU - Le LI
AU - Guoling LIU
AU - Zhiming WANG
PY - 2016
DO - 10.1587/transcom.2016EBP3019
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E99-B
IS - 12
JA - IEICE TRANSACTIONS on Communications
Y1 - December 2016
AB - In this paper, we investigate the degrees of freedom (DoF) of a MIMO cellular interfering network (CIN) with L (L≥3) cells and K users per cell. Previous works established the DoF upper bound of LK(M+N)/(LK+1) for the MIMO CIN by analyzing the interference alignment (IA) feasibility, where M and N denote the number of antennas at each base station (BS) and each user, respectively. However, there is still a gap between the DoF upper bound and the achievable DoF in existing designs. To address this problem, we propose two linear IA schemes without symbol extensions to jointly design transmit and receive beamforming matrices to align and eliminate interference. In the two schemes, the transmit beamforming vectors are allocated to different cluster structures so that the inter-cell interference (ICI) data streams from different ICI channels are aligned. The first scheme, named fixed cluster structure (FCS-IA) scheme, allocates ICI beamforming vectors to the cluster structures of fixed dimension and can achieve the DoF upper bound under some system configurations. The second scheme, named dynamic cluster structure IA (DCS-IA) scheme, allocates ICI beamforming vectors to the cluster structures of dynamic dimension and can get a tradeoff between the number of antennas at BSs and users so that ICI alignment can be applied under various system configurations. Through theoretical analysis and numerical simulations, we verify that the DoF upper bound can be achieved by using the FCS-IA scheme. Furthermore, we show that the proposed schemes can provide significant performance gain over the time division multiple access (TDMA) scheme in terms of DoF. From the perspective of DoF, it is shown that the proposed schemes are more effective than the conventional IA schemes for the MIMO CIN.
ER -