This letter investigates the joint content push and transmission design relying on the cache-enabled helper. The helper is also equipped with the function of simultaneous wireless information and power transfer. With the help of non-orthogonal multiple access (NOMA) technique, we propose a two-stage transmission scheme. Under the minimum quality of service requirements, the sum rate optimization problem is formulated. Owing to the non-convexity nature of this problem, a series of approximation techniques, such as semi-definite relaxation, successive convex approximation and arithmetic-geometric mean inequality, are employed, after which the original optimization problem is converted into the convex form. Simulation results manifest the fast convergence property of the proposed algorithm, and demonstrate the superiority of the NOMA-based two-stage transmission strategy compared with a benchmark scheme.

中文翻译：

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使用 SWIPT 缓存助手在 NOMA 中进行联合内容推送和传输

这封信研究了依赖启用缓存的助手的联合内容推送和传输设计。该帮手还配备了同步无线信息和电力传输功能。借助非正交多址（NOMA）技术，我们提出了一种两级传输方案。在最低服务质量要求下，提出总速率优化问题。由于该问题的非凸性，采用了一系列近似技术，如半定松弛、逐次凸逼近和算术几何平均不等式，然后将原始优化问题转化为凸形式。仿真结果证明了该算法收敛速度快，