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
Graças ao desenvolvimento da rede móvel de 6ª geração que nos permite avançar para uma sociedade da informação inteligente e omnipresente, entre a qual algumas novas tecnologias representadas pela rede sem células também atraíram a atenção académica generalizada. A rede sem células trouxe ganhos distintos à capacidade da rede com sua forte capacidade contra interferência entre células. Infelizmente, novas melhorias exigem que mais estações base (BSs) sejam instaladas, o que acarreta um aumento acentuado de custos. Para resolver este problema, superfície inteligente reconfigurável (RIS) com baixo custo e consumo de energia é introduzida neste artigo para substituir alguns dos BSs triviais no sistema, então, um paradigma de rede livre de células auxiliado por RIS é formulado. Nosso objetivo é resolver o problema de maximização da taxa de soma ponderada (WSR), otimizando conjuntamente o projeto de formação de feixe em BSs e a mudança de fase dos RISs. Devido à não convexidade do problema formulado, este artigo investiga um esquema de otimização conjunta baseado no método de descida por coordenadas de bloco (BCD). Posteriormente, devido à maior parte do trabalho precioso colocado na configuração perfeita da informação do estado do canal (CSI) para o desempenho final, este artigo também estende o algoritmo proposto para o caso em que o CSI é imperfeito, utilizando aproximação convexa sucessiva (SCA). Finalmente, os resultados da simulação demonstram que o esquema proposto apresenta ótimo desempenho e robustez tanto no cenário CSI perfeito quanto nos imperfeitos.
Zhiwei SI
Guangxi University
Haibin WAN
Guangxi University
Tuanfa QIN
Guangxi University
Zhengqiang WANG
Chongqing University of Posts and Telecommunication
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Zhiwei SI, Haibin WAN, Tuanfa QIN, Zhengqiang WANG, "RIS-Aided Cell-Free MIMO System: Perfect and Imperfect CSI Design for Energy Efficiency" in IEICE TRANSACTIONS on Communications,
vol. E106-B, no. 10, pp. 928-937, October 2023, doi: 10.1587/transcom.2022EBP3173.
Abstract: Thanks to the development of the 6th generation mobile network that makes it possible for us to move towards an intelligent ubiquitous information society, among which some novel technologies represented by cell-free network has also attracted widespread academic attention. Cell-free network has brought distinguished gains to the network capacity with its strong ability against inter-cell interference. Unfortunately, further improvement demands more base stations (BSs) to be settled, which incurs steep cost increase. To address this issue, reconfigurable intelligent surface (RIS) with low cost and power consumption is introduced in this paper to replace some of the trivial BSs in the system, then, a RIS-aided cell-free network paradigm is formulated. Our objective is to solve the weighted sum-rate (WSR) maximization problem by jointly optimizing the beamforming design at BSs and the phase shift of RISs. Due to the non-convexity of the formulated problem, this paper investigates a joint optimizing scheme based on block coordinate descent (BCD) method. Subsequently, on account of the majority of the precious work reposed perfect channel state information (CSI) setup for the ultimate performance, this paper also extends the proposed algorithm to the case wherein CSI is imperfect by utilizing successive convex approximation (SCA). Finally, simulation results demonstrate that the proposed scheme shows great performance and robustness in perfect CSI scenario as well as the imperfect ones.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2022EBP3173/_p
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@ARTICLE{e106-b_10_928,
author={Zhiwei SI, Haibin WAN, Tuanfa QIN, Zhengqiang WANG, },
journal={IEICE TRANSACTIONS on Communications},
title={RIS-Aided Cell-Free MIMO System: Perfect and Imperfect CSI Design for Energy Efficiency},
year={2023},
volume={E106-B},
number={10},
pages={928-937},
abstract={Thanks to the development of the 6th generation mobile network that makes it possible for us to move towards an intelligent ubiquitous information society, among which some novel technologies represented by cell-free network has also attracted widespread academic attention. Cell-free network has brought distinguished gains to the network capacity with its strong ability against inter-cell interference. Unfortunately, further improvement demands more base stations (BSs) to be settled, which incurs steep cost increase. To address this issue, reconfigurable intelligent surface (RIS) with low cost and power consumption is introduced in this paper to replace some of the trivial BSs in the system, then, a RIS-aided cell-free network paradigm is formulated. Our objective is to solve the weighted sum-rate (WSR) maximization problem by jointly optimizing the beamforming design at BSs and the phase shift of RISs. Due to the non-convexity of the formulated problem, this paper investigates a joint optimizing scheme based on block coordinate descent (BCD) method. Subsequently, on account of the majority of the precious work reposed perfect channel state information (CSI) setup for the ultimate performance, this paper also extends the proposed algorithm to the case wherein CSI is imperfect by utilizing successive convex approximation (SCA). Finally, simulation results demonstrate that the proposed scheme shows great performance and robustness in perfect CSI scenario as well as the imperfect ones.},
keywords={},
doi={10.1587/transcom.2022EBP3173},
ISSN={1745-1345},
month={October},}
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TY - JOUR
TI - RIS-Aided Cell-Free MIMO System: Perfect and Imperfect CSI Design for Energy Efficiency
T2 - IEICE TRANSACTIONS on Communications
SP - 928
EP - 937
AU - Zhiwei SI
AU - Haibin WAN
AU - Tuanfa QIN
AU - Zhengqiang WANG
PY - 2023
DO - 10.1587/transcom.2022EBP3173
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E106-B
IS - 10
JA - IEICE TRANSACTIONS on Communications
Y1 - October 2023
AB - Thanks to the development of the 6th generation mobile network that makes it possible for us to move towards an intelligent ubiquitous information society, among which some novel technologies represented by cell-free network has also attracted widespread academic attention. Cell-free network has brought distinguished gains to the network capacity with its strong ability against inter-cell interference. Unfortunately, further improvement demands more base stations (BSs) to be settled, which incurs steep cost increase. To address this issue, reconfigurable intelligent surface (RIS) with low cost and power consumption is introduced in this paper to replace some of the trivial BSs in the system, then, a RIS-aided cell-free network paradigm is formulated. Our objective is to solve the weighted sum-rate (WSR) maximization problem by jointly optimizing the beamforming design at BSs and the phase shift of RISs. Due to the non-convexity of the formulated problem, this paper investigates a joint optimizing scheme based on block coordinate descent (BCD) method. Subsequently, on account of the majority of the precious work reposed perfect channel state information (CSI) setup for the ultimate performance, this paper also extends the proposed algorithm to the case wherein CSI is imperfect by utilizing successive convex approximation (SCA). Finally, simulation results demonstrate that the proposed scheme shows great performance and robustness in perfect CSI scenario as well as the imperfect ones.
ER -