Research Article
Sum Rate Maximization for NOMA-Aided Cell-Free System
@INPROCEEDINGS{10.1007/978-3-031-86196-3_25, author={Qiling Gao and Zhongming Feng and Yun Lin}, title={Sum Rate Maximization for NOMA-Aided Cell-Free System}, proceedings={Wireless and Satellite Systems. 14th EAI International Conference, WiSATS 2024, Harbin, China, August 23--25, 2024, Proceedings, Part I}, proceedings_a={WISATS}, year={2025}, month={3}, keywords={Beamforming design Cell-free Non-orthogonal multiple access}, doi={10.1007/978-3-031-86196-3_25} }- Qiling Gao
Zhongming Feng
Yun Lin
Year: 2025
Sum Rate Maximization for NOMA-Aided Cell-Free System
WISATS
Springer
DOI: 10.1007/978-3-031-86196-3_25
Abstract
In this paper, a downlink non-orthogonal multiple access (NOMA)-aided cell-free system is proposed. Multiple access points (APs) are distributed in a wide area and cooperatively serve users using NOMA. A sum rate maximization problem is formulated, where the beamforming coefficients at APs are jointly optimized subject to the minimum rate requirements and decoding order of NOMA users. An iterative algorithm is proposed, where semi-definite programming (SDP) and penalty based methods are employed to address the resultant non-convex problem. Numerical results show that our proposed algorithm converges within 10 iterations, and the sum rate enhancement can be achieved with the aid of our proposed algorithm compared to the orthogonal multiple access (OMA) system. Furthermore, NOMA achieves better user fairness compared with spatial domain multiple access (SDMA), while may suffer a sum rate loss.
