The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
A pré-codificação de múltiplas entradas e múltiplas saídas (MIMO) baseada em livro de códigos pode melhorar significativamente a eficiência espectral do sistema com feedback limitado e foi aceita como uma das técnicas mais promissoras para o UTRA Evoluído (E-UTRA). Comparado com o MIMO de usuário único (SU), o MIMO multiusuário (MU) pode melhorar ainda mais a eficiência espectral do sistema devido ao aumento do ganho de diversidade multiusuário. O MU-MIMO é preferido para o caso de um grande número de usuários, quando a sobrecarga total de feedback se tornará um problema. Para reduzir a sobrecarga de feedback, o feedback do indicador de qualidade de canal único (CQI), por exemplo, CQI de classificação 1, é atualmente necessário no E-UTRA. O principal desafio é como obter CQIs de outras classificações no Nó B para adaptação de classificação com feedback de CQI único. Neste artigo, é proposto um esquema adaptativo de atualização de CQI no Nó B baseado em características estatísticas de CQI de vários níveis. Para aumentar ainda mais a precisão do CQI no Nó B para transmissão de dados, um esquema de feedback de CQI adaptativo é então proposto, no qual um único CQI com a mesma classificação programada anteriormente é realimentado. Os resultados da simulação mostram que nosso esquema de atualização CQI proposto pode atingir um ganho de 2.5-5% em comparação com o método convencional com backoff fixo. Além disso, com o esquema de feedback adaptativo proposto, pode ser obtido um ganho de desempenho de 20-40% e o desempenho pode aproximar-se do limite superior.
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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 -