Adaptive CQI Update and Feedback for Codebook Based MU-MIMO in E-UTRA

Jianchi ZHU; Xiaoming SHE; Jingxiu LIU; Lan CHEN

doi:10.1587/transcom.E92.B.1546

Adaptive CQI Update and Feedback for Codebook Based MU-MIMO in E-UTRA

Jianchi ZHU, Xiaoming SHE, Jingxiu LIU, Lan CHEN

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Codebook based multiple-input multiple-output (MIMO) precoding can significantly improve the system spectral efficiency with limited feedback and has been accepted as one of the most promising techniques for the Evolved UTRA (E-UTRA). Compared with single-user (SU) MIMO, multi-user (MU) MIMO can further improve the system spectral efficiency due to increased multi-user diversity gain. MU-MIMO is preferred for the case of a large number of users,when the total feedback overhead will become a problem. In order to reduce the feedback overhead, feedback of single channel quality indicator (CQI), e.g. rank 1 CQI, is required in E-UTRA currently. The main challenge is how to obtain CQIs of other ranks at Node B for rank adaptation with single CQI feedback. In this paper, an adaptive CQI update scheme at Node B based on statistical characteristics of CQI of various ranks is proposed. To further increase the accuracy of CQI at Node B for data transmission, an adaptive CQI feedback scheme is then proposed in which single CQI with the rank same as previously scheduled is fed back. Simulation results show that our proposed CQI update scheme can achieve 2.5-5% gain compared with the conventional method with fixed backoff. Moreover, with the proposed adaptive feedback scheme, 20-40% performance gain can be obtained and the performance can approach the upper bound.

Publication: IEICE TRANSACTIONS on Communications Vol.E92-B No.5 pp.1546-1552

Publication Date: 2009/05/01

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Online ISSN: 1745-1345

DOI: 10.1587/transcom.E92.B.1546

Type of Manuscript: Special Section PAPER (Special Section on Radio Access Techniques for 3G Evolution)

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Jianchi ZHU, Xiaoming SHE, Jingxiu LIU, Lan CHEN, "Adaptive CQI Update and Feedback for Codebook Based MU-MIMO in E-UTRA" in IEICE TRANSACTIONS on Communications, vol. E92-B, no. 5, pp. 1546-1552, May 2009, doi: 10.1587/transcom.E92.B.1546.
Abstract: Codebook based multiple-input multiple-output (MIMO) precoding can significantly improve the system spectral efficiency with limited feedback and has been accepted as one of the most promising techniques for the Evolved UTRA (E-UTRA). Compared with single-user (SU) MIMO, multi-user (MU) MIMO can further improve the system spectral efficiency due to increased multi-user diversity gain. MU-MIMO is preferred for the case of a large number of users,when the total feedback overhead will become a problem. In order to reduce the feedback overhead, feedback of single channel quality indicator (CQI), e.g. rank 1 CQI, is required in E-UTRA currently. The main challenge is how to obtain CQIs of other ranks at Node B for rank adaptation with single CQI feedback. In this paper, an adaptive CQI update scheme at Node B based on statistical characteristics of CQI of various ranks is proposed. To further increase the accuracy of CQI at Node B for data transmission, an adaptive CQI feedback scheme is then proposed in which single CQI with the rank same as previously scheduled is fed back. Simulation results show that our proposed CQI update scheme can achieve 2.5-5% gain compared with the conventional method with fixed backoff. Moreover, with the proposed adaptive feedback scheme, 20-40% performance gain can be obtained and the performance can approach the upper bound.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.1546/_p

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@ARTICLE{e92-b_5_1546,
author={Jianchi ZHU, Xiaoming SHE, Jingxiu LIU, Lan CHEN, },
journal={IEICE TRANSACTIONS on Communications},
title={Adaptive CQI Update and Feedback for Codebook Based MU-MIMO in E-UTRA},
year={2009},
volume={E92-B},
number={5},
pages={1546-1552},
abstract={Codebook based multiple-input multiple-output (MIMO) precoding can significantly improve the system spectral efficiency with limited feedback and has been accepted as one of the most promising techniques for the Evolved UTRA (E-UTRA). Compared with single-user (SU) MIMO, multi-user (MU) MIMO can further improve the system spectral efficiency due to increased multi-user diversity gain. MU-MIMO is preferred for the case of a large number of users,when the total feedback overhead will become a problem. In order to reduce the feedback overhead, feedback of single channel quality indicator (CQI), e.g. rank 1 CQI, is required in E-UTRA currently. The main challenge is how to obtain CQIs of other ranks at Node B for rank adaptation with single CQI feedback. In this paper, an adaptive CQI update scheme at Node B based on statistical characteristics of CQI of various ranks is proposed. To further increase the accuracy of CQI at Node B for data transmission, an adaptive CQI feedback scheme is then proposed in which single CQI with the rank same as previously scheduled is fed back. Simulation results show that our proposed CQI update scheme can achieve 2.5-5% gain compared with the conventional method with fixed backoff. Moreover, with the proposed adaptive feedback scheme, 20-40% performance gain can be obtained and the performance can approach the upper bound.},
keywords={},
doi={10.1587/transcom.E92.B.1546},
ISSN={1745-1345},
month={May},}

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TY - JOUR
TI - Adaptive CQI Update and Feedback for Codebook Based MU-MIMO in E-UTRA
T2 - IEICE TRANSACTIONS on Communications
SP - 1546
EP - 1552
AU - Jianchi ZHU
AU - Xiaoming SHE
AU - Jingxiu LIU
AU - Lan CHEN
PY - 2009
DO - 10.1587/transcom.E92.B.1546
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 5
JA - IEICE TRANSACTIONS on Communications
Y1 - May 2009
AB - Codebook based multiple-input multiple-output (MIMO) precoding can significantly improve the system spectral efficiency with limited feedback and has been accepted as one of the most promising techniques for the Evolved UTRA (E-UTRA). Compared with single-user (SU) MIMO, multi-user (MU) MIMO can further improve the system spectral efficiency due to increased multi-user diversity gain. MU-MIMO is preferred for the case of a large number of users,when the total feedback overhead will become a problem. In order to reduce the feedback overhead, feedback of single channel quality indicator (CQI), e.g. rank 1 CQI, is required in E-UTRA currently. The main challenge is how to obtain CQIs of other ranks at Node B for rank adaptation with single CQI feedback. In this paper, an adaptive CQI update scheme at Node B based on statistical characteristics of CQI of various ranks is proposed. To further increase the accuracy of CQI at Node B for data transmission, an adaptive CQI feedback scheme is then proposed in which single CQI with the rank same as previously scheduled is fed back. Simulation results show that our proposed CQI update scheme can achieve 2.5-5% gain compared with the conventional method with fixed backoff. Moreover, with the proposed adaptive feedback scheme, 20-40% performance gain can be obtained and the performance can approach the upper bound.
ER -