Performance Analysis and Power Allocation for NOMA-assisted Cloud Radio Access Network

• Fangcheng Xu,
• Xiangbin Yu,
• Weiye Xu,
• Jiali Cai,

Vol. 15, No. 3, March 31, 2021
10.3837/tiis.2021.03.019, Download Paper (Free):

• Cloud radio access networks
• Ergodic Sum Rate
• Non-orthogonal multiple access
• power allocation
• outage probability

Abstract

With the assistance of non-orthogonal multiple access (NOMA), the spectrum efficiency and the number of users in cloud radio access network (CRAN) can be greatly improved. In this paper, the system performance of NOMA-assisted CRAN is investigated. Specially, the outage probability (OP) and ergodic sum rate (ESR), are derived for performance evaluation of the system, respectively. Based on this, by minimizing the OP of the system, a suboptimal power allocation (PA) scheme with closed-form PA coefficients is proposed. Numerical simulations validate the accuracy of the theoretical results, where the derived OP has more accuracy than the existing one. Moreover, the developed PA scheme has superior performance over the conventional fixed PA scheme but has smaller performance loss than the optimal PA scheme using the exhaustive search method.

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