Channel Estimation for RIS Assisted Wireless Communications-Part I: Fundamentals, Solutions, and Future Opportunities

The reconfigurable intelligent surface (RIS) with low hardware cost and energy consumption has been recognized as a potential technique for future 6G communications to enhance coverage and capacity. To achieve this goal, accurate channel state information (CSI) in RIS assisted wireless communication...

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Veröffentlicht in:	IEEE communications letters Jg. 25; H. 5; S. 1398 - 1402
Hauptverfasser:	Wei, Xiuhong, Shen, Decai, Dai, Linglong
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	New York IEEE 01.05.2021 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:	Array signal processing Beamforming Channel estimation Communications systems Energy consumption Estimation Receiving antennas Reconfigurable intelligent surface (RIS) Signal processing Signal processing algorithms Uplink Wireless communication Wireless communication systems Wireless communications
ISSN:	1089-7798, 1558-2558
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Abstract	The reconfigurable intelligent surface (RIS) with low hardware cost and energy consumption has been recognized as a potential technique for future 6G communications to enhance coverage and capacity. To achieve this goal, accurate channel state information (CSI) in RIS assisted wireless communication system is essential for the joint beamforming at the base station (BS) and the RIS. However, channel estimation is challenging, since a large number of passive RIS elements cannot transmit, receive, or process signals. In the first part of this invited paper, we provide an overview of the fundamentals, solutions, and future opportunities of channel estimation in the RIS assisted wireless communication system. It is noted that a new channel estimation scheme with low pilot overhead will be provided in the second part of this letter.
AbstractList	The reconfigurable intelligent surface (RIS) with low hardware cost and energy consumption has been recognized as a potential technique for future 6G communications to enhance coverage and capacity. To achieve this goal, accurate channel state information (CSI) in RIS assisted wireless communication system is essential for the joint beamforming at the base station (BS) and the RIS. However, channel estimation is challenging, since a large number of passive RIS elements cannot transmit, receive, or process signals. In the first part of this invited paper, we provide an overview of the fundamentals, solutions, and future opportunities of channel estimation in the RIS assisted wireless communication system. It is noted that a new channel estimation scheme with low pilot overhead will be provided in the second part of this letter.
Author	Dai, Linglong Wei, Xiuhong Shen, Decai
Author_xml	– sequence: 1 givenname: Xiuhong orcidid: 0000-0002-6117-3189 surname: Wei fullname: Wei, Xiuhong email: weixh19@mails.tsinghua.edu.cn organization: Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing, China – sequence: 2 givenname: Decai orcidid: 0000-0002-3813-5096 surname: Shen fullname: Shen, Decai email: sdc18@mails.tsinghua.edu.cn organization: Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing, China – sequence: 3 givenname: Linglong orcidid: 0000-0002-4250-7315 surname: Dai fullname: Dai, Linglong email: daill@tsinghua.edu.cn organization: Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing, China
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SubjectTerms	Array signal processing Beamforming Channel estimation Communications systems Energy consumption Estimation Receiving antennas Reconfigurable intelligent surface (RIS) Signal processing Signal processing algorithms Uplink Wireless communication Wireless communication systems Wireless communications
Title	Channel Estimation for RIS Assisted Wireless Communications-Part I: Fundamentals, Solutions, and Future Opportunities
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