Reconfigurable Intelligent Surface Enhanced NOMA Assisted Backscatter Communication System

To enhance the backscatter-links with double fading effect in non-orthogonal multiple access assisted backscatter communication (NOMABC), a new reconfigurable intelligent surface (RIS) enhanced NOMABC (RIS-NOMABC) system is proposed. A joint optimization problem over power reflection coefficients at...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2021-07, Vol.70 (7), p.7261-7266
Main Authors: Zuo, Jiakuo, Liu, Yuanwei, Yang, Liang, Song, Lingyang, Liang, Ying-Chang
Format: Article
Language:English
Subjects:
Algorithms
Backscatter
Backscatter communication
Backscattering
Communications systems
Decoding
Internet of Things
NOMA
non-orthogonal multiple access
Nonorthogonal multiple access
Optimization
power allocation
Quality of service
reconfigurable intelligent surface
Reconfigurable intelligent surfaces
Resource management
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Summary:To enhance the backscatter-links with double fading effect in non-orthogonal multiple access assisted backscatter communication (NOMABC), a new reconfigurable intelligent surface (RIS) enhanced NOMABC (RIS-NOMABC) system is proposed. A joint optimization problem over power reflection coefficients at the backscatter devices (BDs) and phase shifts at the RIS is formulated. To solve this non-convex problem, a low complexity algorithm is proposed by invoking the alternative optimization, successive convex approximation and manifold optimization algorithms. Numerical results corroborate that the proposed RIS-NOMABC system outperforms the conventional NOMABC system without RIS, and demonstrate the feasibility and effectiveness of the proposed algorithm.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2021.3087582