Joint Active and Passive Beamforming for Reconfigurable Intelligent Surface Enhanced Symbiotic Radio System

This letter considers a symbiotic radio (SR) system enhanced by a reconfigurable intelligent surface (RIS). The active transmit beamforming of the base station (BS) and the passive beamforming of the RIS are jointly designed to minimize the BS's transmission power, subject to the signal-to-inte...

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Bibliographic Details
Published inIEEE wireless communications letters Vol. 10; no. 5; pp. 1056 - 1060
Main Authors Chen, Hao, Yang, Gang, Liang, Ying-Chang
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.05.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
active and passive beamforming
Array signal processing
Backscatter
Backscattering
Beamforming
Decoding
Downlink
Interference
Internet-of-Things
Iterative algorithms
Iterative methods
Optimization
reconfigurable intelligent surface
Reconfigurable intelligent surfaces
Signal to noise ratio
Symbiosis
Symbiotic radio
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Summary:This letter considers a symbiotic radio (SR) system enhanced by a reconfigurable intelligent surface (RIS). The active transmit beamforming of the base station (BS) and the passive beamforming of the RIS are jointly designed to minimize the BS's transmission power, subject to the signal-to-interference-plus-noise ratio constraints for decoding backscatter signal, and the rate constraint for primary communication. To solve the non-convex problem, we propose an efficient iterative algorithm based on alternating optimization and semi-definite relaxation. The algorithm's convergence and complexity are analyzed. Numerical results show that the RIS-enhanced SR achieves lower transmission power than SR without RIS.
Bibliography:ObjectType-Article-1
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ISSN:2162-2337
2162-2345
DOI:10.1109/LWC.2021.3056874