Abstract
Non-orthogonal multiple access (NOMA) has become one of the promising technologies for 5G, which can improve the spectrum resource utilization and system throughput along with the support of effective resource allocation algorithms. Most previous works on NOMA-enhanced cooperative relay systems assume perfect channel state information (CSI), which degrades the performance of their schemes severely when used in imperfect CSI environment. In this article, a power allocation algorithm in D2D aided cooperative NOMA communications with imperfect CSI is proposed. In the proposed algorithm, the probabilistic non-convex optimization problem is transformed into a non-probabilistic convex optimization problem by evaluating the channel gains and using the successive convex programming (SCP) which approximately gives the lower bound of the maximum transmission rate. In the SCP enhanced power allocation algorithm (SCPPAA), we iteratively obtain the sub-optimal power allocation coefficients for the optimization problem by Lagrangian dual multiplier method and Karush–Kuhn–Tucker conditions. This program is divided into two layers for updating the power allocation coefficients and the multipliers respectively. Numerical results demonstrate that our algorithm has a fast convergence performance and the algorithm in D2D-based cooperative NOMA scheme has significant sum-data-rate advantages compared with it in traditional ways.









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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 61601109); the Fundamental Research Funds for the Central Universities (Grant No. N152305001).
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Wang, J., Song, X., Dong, L. et al. Power allocation for D2D aided cooperative NOMA system with imperfect CSI. Wireless Netw 30, 3669–3682 (2024). https://doi.org/10.1007/s11276-021-02561-x
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DOI: https://doi.org/10.1007/s11276-021-02561-x