Resource Allocation in NOMA-Assisted Ambient Backscatter Communication System

Electronics

Jijiang Hou¹  Hongbiao Jia¹  Qiang Liu²  Songlin Sun²  Michel Kadoch³ 

[1] China Telecom Corporation Limited, Beijing 100876, China;National Engineering Laboratory for Mobile Network Security, Beijing University of Posts and Telecommunications, Beijing 100876, China;École de Technologie Supérieure (ETS), University of Quebec, Montreal, QC H3C 3J7, Canada;

关键词: NOMA;    Internet of Things;    ambient backscatter communication;    resource allocation;   

DOI  :  10.3390/electronics10243061

来源: DOAJ

【 摘 要 】

This paper considers a non-orthogonal multiple access (NOMA)-assisted ambient backscatter communication (AmBC) system. To maximize the achievable sum rate (ASR) of the AmBC system, a joint optimization problem over a backscatter device (BD) grouping strategy, reflection coefficients, and decoding order is formulated, where the BD grouping strategy contains the number of BD groups and the BD allocation strategy. The BD grouping strategy, the reflection coefficients, and the decoding order are all intertwined, and the global search is extremely complex. As a result, we propose a four-step optimization algorithm. First, we give the closed-form optimal solution of the BD decoding order and reflection coefficient for a given grouping strategy. Then, for a given number of BD groups, we propose a low-complexity BD allocation strategy based on the complexity–performance trade-off. Finally, the number of BD groups with the largest ASR is selected as the global optimal number of BD groups. The simulation results show that the proposed four-step optimization algorithm is better than the benchmark solution.

【 授权许可】

Unknown