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Open AccessArticle

A Low-Complexity Resource Allocation for Multiple Access Passive IoT System

by Shiying Han 1,* and Zixiong Wang 2
1
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
2
School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(12), 1421; https://doi.org/10.3390/electronics8121421
Received: 6 November 2019 / Accepted: 26 November 2019 / Published: 28 November 2019
An ambient backscatter communication (AmBC) system with multiple backscatter devices (BDs) is investigated in this work. The cooperative reader receives the information from the primary transmitter (PT) and the multiple BDs simultaneously. With the asymptotic signal-to-noise-plus-interference ratio (SINR) of the BDs, an optimization problem that jointly optimizes the reflection coefficients of BDs and the primary transmit power is formulated. Considering that the adaptive optimization of reflection coefficients according to the instantaneous primary channel state information (CSI) is unaffordable in practice, we propose a low-complexity resource allocation scheme, which results in a long-term configuration of the BD reflection coefficients before the primary transmit power is allocated. With the long-term reflection coefficients, the transmit power of the primary system is optimized by solving the transformed two cascaded optimization problems which have closed-form solutions. Simulation results are provided to demonstrate the effectiveness of the proposed scheme. View Full-Text
Keywords: Internet-of-Things; ambient backscatter communications; multiple access; resource allocation; symbiotic radio Internet-of-Things; ambient backscatter communications; multiple access; resource allocation; symbiotic radio
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Han, S.; Wang, Z. A Low-Complexity Resource Allocation for Multiple Access Passive IoT System. Electronics 2019, 8, 1421.

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