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Partition-Based RIS-Assisted Multiple Access: NOMA Decoding Order Perspective
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DOI：10.1109/TVT.2022.3176017.png)
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Abstract
En 中文
In this correspondence, we propose a closed-form resource allocation called partition-based multiple access (MA), which simultaneously utilizes both a reconfigurable intelligent surface (RIS) and non-orthogonal multiple access (NOMA) to reduce processing overhead and transmit power. The RIS can tune the mmWave signal and reduce the downlink transmit power, and NOMA achieves a relatively higher spectral efficiency than other MA methods. The integration of the RIS and NOMA, thus, can be a powerful solution. Previous studies have yet to obtain a closed-form solution for both the beam tuning settings and the decoding order in low complexity in the conventional RIS-NOMA. The proposed partition-based MA method, however, divides and arranges the array elements of the RIS to generate a fine beam for NOMA communications. We compare the transmit power reduction of the proposed method with the transmit power reduction of time-sharing and decode-and-forward relay. To confirm the feasibility of the integration, we also derive the criteria for MA mode selection.
Keywords:
NOMA
Decoding
Tuning
Complexity theory
Relays
Array signal processing
Symbols
Reconfigurable intelligent surface (RIS)
multiple access
non-orthogonal multiple access (NOMA)
Journal
IF:
7.1
Papers:
1.8W
Citations:
6.6W