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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Bibliographic Details
Published in:IEEE communications letters Vol. 25; no. 5; pp. 1398 - 1402
Main Authors: Wei, Xiuhong, Shen, Decai, Dai, Linglong
Format: Journal Article
Language:English
Published: New York IEEE 01.05.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
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
Online Access:Get full text
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Summary: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.
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ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2021.3052822