This paper investigates a novel communication paradigm employing movable antennas (MAs) within a multiple-input single-output (MISO) non-orthogonal multiple access (NOMA) downlink framework, where users are equipped with MAs. Initially, leveraging the far-field response, we delineate the channel characteristics concerning both the power allocation coefficient and positions of MAs. Subsequently, we endeavor to maximize the channel capacity by jointly optimizing power allocation and antenna positions. To tackle the resultant non-convex problem, we propose an alternating optimization (AO) scheme underpinned by successive convex approximation (SCA) to converge towards a stationary point. Through numerical simulations, our findings substantiate the superiority of the MA-assisted NOMA system over both orthogonal multiple access (OMA) and conventional NOMA configurations in terms of average sum rate and outage probability.

翻译：本文研究了一种在多输入单输出非正交多址下行框架中采用可移动天线的新型通信范式，其中用户设备配备可移动天线。首先，基于远场响应特性，我们刻画了关于功率分配系数与可移动天线位置的信道特征。随后，我们通过联合优化功率分配与天线位置以实现信道容量最大化。针对由此产生的非凸优化问题，我们提出了一种基于逐次凸逼近的交替优化方案，以确保算法收敛至稳定点。数值仿真结果表明，在平均和速率与中断概率方面，可移动天线辅助的非正交多址系统性能均优于正交多址方案及传统非正交多址配置。