A new user selection measure in Block Diagonalization algorithm for multiuser MIMO systems

Riichi Kudo, Yasushi Takatori, Kentaro Nishimori, Atsushi Ohta, Shuji Kubota, Masato Mizoguchi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Multiuser - Multiple Input Multiple Output (MU-MIMO) techniques were proposed to increase spectrum efficiency; a key assumption was that the Mobile Terminals (MTs) were simple with only a few antennas. This paper focuses on the Block Diagonalization algorithm (BD) based on the equal power allocation strategy as a practical MU-MIMO technique. When there are many MTs inside the service area of the access point (AP), the AP must determine, at each time slot, the subset of the MTs to be spatially multiplexed. Since the transmission performance depends on the subsets of MTs, the user selection method needs to use the Channel State Information (CSI) obtained in the physical layer to maximize the Achievable Transmission Rate (ATR). In this paper, we clarify the relationship between ATR with SU-MIMO and that with MU-MIMO in a high eigenvalue channel. Based on the derived relationship, we propose a new measure for user selection. The new measure, the eigenvalue decay factor, represents the degradation of the eigenvalues in null space compared to those in SU-MIMO; it is obtained from the signal space vectors of the MTs. A user selection method based on the proposed measure identifies the combination of MTs that yields the highest ATR; our approach also reduces the computational load of user selection. We evaluate the effectiveness of user selection with the new measure using numerical formulations and computer simulations.

Original languageEnglish
Pages (from-to)3206-3218
Number of pages13
JournalIEICE Transactions on Communications
VolumeE92-B
Issue number10
DOIs
Publication statusPublished - 2009 Oct

Fingerprint

MIMO systems
Channel state information
Vector spaces
Antennas
Degradation
Computer simulation

Keywords

  • Block Diagonalization
  • Channel capacity
  • Multiuser mimo
  • User selection

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Software

Cite this

A new user selection measure in Block Diagonalization algorithm for multiuser MIMO systems. / Kudo, Riichi; Takatori, Yasushi; Nishimori, Kentaro; Ohta, Atsushi; Kubota, Shuji; Mizoguchi, Masato.

In: IEICE Transactions on Communications, Vol. E92-B, No. 10, 10.2009, p. 3206-3218.

Research output: Contribution to journalArticle

Kudo, Riichi ; Takatori, Yasushi ; Nishimori, Kentaro ; Ohta, Atsushi ; Kubota, Shuji ; Mizoguchi, Masato. / A new user selection measure in Block Diagonalization algorithm for multiuser MIMO systems. In: IEICE Transactions on Communications. 2009 ; Vol. E92-B, No. 10. pp. 3206-3218.
@article{71ae654b6c3c4f45985299143b17bc0b,
title = "A new user selection measure in Block Diagonalization algorithm for multiuser MIMO systems",
abstract = "Multiuser - Multiple Input Multiple Output (MU-MIMO) techniques were proposed to increase spectrum efficiency; a key assumption was that the Mobile Terminals (MTs) were simple with only a few antennas. This paper focuses on the Block Diagonalization algorithm (BD) based on the equal power allocation strategy as a practical MU-MIMO technique. When there are many MTs inside the service area of the access point (AP), the AP must determine, at each time slot, the subset of the MTs to be spatially multiplexed. Since the transmission performance depends on the subsets of MTs, the user selection method needs to use the Channel State Information (CSI) obtained in the physical layer to maximize the Achievable Transmission Rate (ATR). In this paper, we clarify the relationship between ATR with SU-MIMO and that with MU-MIMO in a high eigenvalue channel. Based on the derived relationship, we propose a new measure for user selection. The new measure, the eigenvalue decay factor, represents the degradation of the eigenvalues in null space compared to those in SU-MIMO; it is obtained from the signal space vectors of the MTs. A user selection method based on the proposed measure identifies the combination of MTs that yields the highest ATR; our approach also reduces the computational load of user selection. We evaluate the effectiveness of user selection with the new measure using numerical formulations and computer simulations.",
keywords = "Block Diagonalization, Channel capacity, Multiuser mimo, User selection",
author = "Riichi Kudo and Yasushi Takatori and Kentaro Nishimori and Atsushi Ohta and Shuji Kubota and Masato Mizoguchi",
year = "2009",
month = "10",
doi = "10.1587/transcom.E92.B.3206",
language = "English",
volume = "E92-B",
pages = "3206--3218",
journal = "IEICE Transactions on Communications",
issn = "0916-8516",
publisher = "Maruzen Co., Ltd/Maruzen Kabushikikaisha",
number = "10",

}

TY - JOUR

T1 - A new user selection measure in Block Diagonalization algorithm for multiuser MIMO systems

AU - Kudo, Riichi

AU - Takatori, Yasushi

AU - Nishimori, Kentaro

AU - Ohta, Atsushi

AU - Kubota, Shuji

AU - Mizoguchi, Masato

PY - 2009/10

Y1 - 2009/10

N2 - Multiuser - Multiple Input Multiple Output (MU-MIMO) techniques were proposed to increase spectrum efficiency; a key assumption was that the Mobile Terminals (MTs) were simple with only a few antennas. This paper focuses on the Block Diagonalization algorithm (BD) based on the equal power allocation strategy as a practical MU-MIMO technique. When there are many MTs inside the service area of the access point (AP), the AP must determine, at each time slot, the subset of the MTs to be spatially multiplexed. Since the transmission performance depends on the subsets of MTs, the user selection method needs to use the Channel State Information (CSI) obtained in the physical layer to maximize the Achievable Transmission Rate (ATR). In this paper, we clarify the relationship between ATR with SU-MIMO and that with MU-MIMO in a high eigenvalue channel. Based on the derived relationship, we propose a new measure for user selection. The new measure, the eigenvalue decay factor, represents the degradation of the eigenvalues in null space compared to those in SU-MIMO; it is obtained from the signal space vectors of the MTs. A user selection method based on the proposed measure identifies the combination of MTs that yields the highest ATR; our approach also reduces the computational load of user selection. We evaluate the effectiveness of user selection with the new measure using numerical formulations and computer simulations.

AB - Multiuser - Multiple Input Multiple Output (MU-MIMO) techniques were proposed to increase spectrum efficiency; a key assumption was that the Mobile Terminals (MTs) were simple with only a few antennas. This paper focuses on the Block Diagonalization algorithm (BD) based on the equal power allocation strategy as a practical MU-MIMO technique. When there are many MTs inside the service area of the access point (AP), the AP must determine, at each time slot, the subset of the MTs to be spatially multiplexed. Since the transmission performance depends on the subsets of MTs, the user selection method needs to use the Channel State Information (CSI) obtained in the physical layer to maximize the Achievable Transmission Rate (ATR). In this paper, we clarify the relationship between ATR with SU-MIMO and that with MU-MIMO in a high eigenvalue channel. Based on the derived relationship, we propose a new measure for user selection. The new measure, the eigenvalue decay factor, represents the degradation of the eigenvalues in null space compared to those in SU-MIMO; it is obtained from the signal space vectors of the MTs. A user selection method based on the proposed measure identifies the combination of MTs that yields the highest ATR; our approach also reduces the computational load of user selection. We evaluate the effectiveness of user selection with the new measure using numerical formulations and computer simulations.

KW - Block Diagonalization

KW - Channel capacity

KW - Multiuser mimo

KW - User selection

UR - http://www.scopus.com/inward/record.url?scp=77956564436&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77956564436&partnerID=8YFLogxK

U2 - 10.1587/transcom.E92.B.3206

DO - 10.1587/transcom.E92.B.3206

M3 - Article

AN - SCOPUS:77956564436

VL - E92-B

SP - 3206

EP - 3218

JO - IEICE Transactions on Communications

JF - IEICE Transactions on Communications

SN - 0916-8516

IS - 10

ER -