Energy efficiency (EE) is an important performance metric in communication systems. However, to the best of our knowledge, the energy-efficient resource allocation (RA) problem in non-orthogonal multiple access enabled backscatter communication networks (NOMA-BackComNet) comprehensively considering the user’s quality of service (QoS) has not been investigated. In this letter, we present the first attempt to solve the EE-based RA problem for NOMA-BackComNet with QoS guarantee. The objective is to maximize the EE of users subject to the QoS requirements of users, the decoding order of successive interference cancellation and the reflection coefficient (RC) constraint, where the transmit power of the base station and the RC of the backscatter device are jointly optimized. To solve this non-convex problem, we develop a novel iteration algorithm by using Dinkelbach’s method and the quadratic transformation approach. Simulation results verify the effectiveness of the proposed scheme in improving the EE by comparing it with the other schemes.

中文翻译：

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保证QoS的NOMA反向散射通信中的能效最大化

能源效率（EE）是通信系统中的重要性能指标。但是，就我们所知，尚未全面考虑用户服务质量（QoS）的非正交多址启用反向散射通信网络（NOMA-BackComNet）中的节能资源分配（RA）问题。在这封信中，我们提出了使用QoS保证解决NOMA-BackComNet的基于EE的RA问题的首次尝试。目的是使用户的EE最大化，这取决于用户的QoS要求，连续干扰消除的解码顺序和反射系数（RC）约束，其中基站的发射功率和反向散射设备的RC共同优化。为了解决这个非凸问题，我们使用Dinkelbach方法和二次变换方法开发了一种新颖的迭代算法。仿真结果通过与其他方案进行比较，验证了该方案在改善EE方面的有效性。