MIMO broadcast channels based on SINR feedback using a non-orthogonal beamforming matrix

Jongrok Park, Hojae Lee, Sanghoon Lee

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The signal to interference plus noise ratio (SINR) feedback has been utilized in random beamforming (RBF) to select users for multiple-input multiple-output (MIMO) systems where a large number of users are required to obtain a multi-user diversity gain. However, if the number of users is not large enough, it may be difficult to obtain the performance gain and be easy to have a performance degradation conversely. To resolve this problem, it is necessary to find orthogonal random beams close to the channel matrix of selected users. In this paper, we present RBF using a non-orthogonal beamforming matrix (RBF NOBM), demonstrating an efficient search of random beams correlated with the channel matrix of selected users over a small number of users. For single user RBF using NOBM (SU-RBF NOBM) with two transmit antennas, the beamforming matrix for user data service is obtained through closed form expressions, and SU-RBF NOBM is then expanded to more than two transmit antennas. We also propose user selection algorithms for SU-RBF NOBM and multi-user RBF using NOBM (MU-RBF NOBM). Via simulation results, we demonstrate that the performances of RBF NOBM represent significant improvements compared to conventional beamforming schemes.

Original languageEnglish
Article number6226899
Pages (from-to)2534-2545
Number of pages12
JournalIEEE Transactions on Communications
Volume60
Issue number9
DOIs
Publication statusPublished - 2012 Jul 3

Fingerprint

Beamforming
Feedback
Antennas
Degradation

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

@article{1a1b45e992354a368a93b5236a963320,
title = "MIMO broadcast channels based on SINR feedback using a non-orthogonal beamforming matrix",
abstract = "The signal to interference plus noise ratio (SINR) feedback has been utilized in random beamforming (RBF) to select users for multiple-input multiple-output (MIMO) systems where a large number of users are required to obtain a multi-user diversity gain. However, if the number of users is not large enough, it may be difficult to obtain the performance gain and be easy to have a performance degradation conversely. To resolve this problem, it is necessary to find orthogonal random beams close to the channel matrix of selected users. In this paper, we present RBF using a non-orthogonal beamforming matrix (RBF NOBM), demonstrating an efficient search of random beams correlated with the channel matrix of selected users over a small number of users. For single user RBF using NOBM (SU-RBF NOBM) with two transmit antennas, the beamforming matrix for user data service is obtained through closed form expressions, and SU-RBF NOBM is then expanded to more than two transmit antennas. We also propose user selection algorithms for SU-RBF NOBM and multi-user RBF using NOBM (MU-RBF NOBM). Via simulation results, we demonstrate that the performances of RBF NOBM represent significant improvements compared to conventional beamforming schemes.",
author = "Jongrok Park and Hojae Lee and Sanghoon Lee",
year = "2012",
month = "7",
day = "3",
doi = "10.1109/TCOMM.2012.062512.110159",
language = "English",
volume = "60",
pages = "2534--2545",
journal = "IEEE Transactions on Communications",
issn = "0096-1965",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "9",

}

MIMO broadcast channels based on SINR feedback using a non-orthogonal beamforming matrix. / Park, Jongrok; Lee, Hojae; Lee, Sanghoon.

In: IEEE Transactions on Communications, Vol. 60, No. 9, 6226899, 03.07.2012, p. 2534-2545.

Research output: Contribution to journalArticle

TY - JOUR

T1 - MIMO broadcast channels based on SINR feedback using a non-orthogonal beamforming matrix

AU - Park, Jongrok

AU - Lee, Hojae

AU - Lee, Sanghoon

PY - 2012/7/3

Y1 - 2012/7/3

N2 - The signal to interference plus noise ratio (SINR) feedback has been utilized in random beamforming (RBF) to select users for multiple-input multiple-output (MIMO) systems where a large number of users are required to obtain a multi-user diversity gain. However, if the number of users is not large enough, it may be difficult to obtain the performance gain and be easy to have a performance degradation conversely. To resolve this problem, it is necessary to find orthogonal random beams close to the channel matrix of selected users. In this paper, we present RBF using a non-orthogonal beamforming matrix (RBF NOBM), demonstrating an efficient search of random beams correlated with the channel matrix of selected users over a small number of users. For single user RBF using NOBM (SU-RBF NOBM) with two transmit antennas, the beamforming matrix for user data service is obtained through closed form expressions, and SU-RBF NOBM is then expanded to more than two transmit antennas. We also propose user selection algorithms for SU-RBF NOBM and multi-user RBF using NOBM (MU-RBF NOBM). Via simulation results, we demonstrate that the performances of RBF NOBM represent significant improvements compared to conventional beamforming schemes.

AB - The signal to interference plus noise ratio (SINR) feedback has been utilized in random beamforming (RBF) to select users for multiple-input multiple-output (MIMO) systems where a large number of users are required to obtain a multi-user diversity gain. However, if the number of users is not large enough, it may be difficult to obtain the performance gain and be easy to have a performance degradation conversely. To resolve this problem, it is necessary to find orthogonal random beams close to the channel matrix of selected users. In this paper, we present RBF using a non-orthogonal beamforming matrix (RBF NOBM), demonstrating an efficient search of random beams correlated with the channel matrix of selected users over a small number of users. For single user RBF using NOBM (SU-RBF NOBM) with two transmit antennas, the beamforming matrix for user data service is obtained through closed form expressions, and SU-RBF NOBM is then expanded to more than two transmit antennas. We also propose user selection algorithms for SU-RBF NOBM and multi-user RBF using NOBM (MU-RBF NOBM). Via simulation results, we demonstrate that the performances of RBF NOBM represent significant improvements compared to conventional beamforming schemes.

UR - http://www.scopus.com/inward/record.url?scp=84866738740&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84866738740&partnerID=8YFLogxK

U2 - 10.1109/TCOMM.2012.062512.110159

DO - 10.1109/TCOMM.2012.062512.110159

M3 - Article

AN - SCOPUS:84866738740

VL - 60

SP - 2534

EP - 2545

JO - IEEE Transactions on Communications

JF - IEEE Transactions on Communications

SN - 0096-1965

IS - 9

M1 - 6226899

ER -