利用统计CSI的DMA辅助无线携能通信传输方法

摘要：提出了一种利用统计信道状态信息（CSI）的动态超表面天线（DMA）辅助无线携能通信传输方法。考虑一个由DMA阵列代替传统天线阵列的基站、一个信息解码用户，以及一个能量收集用户构成的无线携能通信系统，将信道建模为莱斯空间相关信道，提出了平均收集能量和发送功率约束条件下的可达遍历速率最大化问题。首先，利用随机矩阵理论将优化问题转化为一个确定性的优化问题；然后，通过交替优化方法，设计了可达速率最大化和仅利用统计CSI的基站发送协方差矩阵和DMA权值矩阵。仿真表明，所提方法能达到通信速率和收集能量之间的最优折中。

关键词：动态超表面天线；无线携能通信；统计信道状态信息；多输入多输出

Abstract: A dynamic metasurface antenna (DMA) assisted wireless portable communication transmission method based on statistical channel state information (CSI) is proposed. A wireless portable communication system is introduced, consisting of a base station using a DMA array instead of a traditional antenna array, an information-decoding user, and an energy-harvesting user. The problem of maximizing the achievable ergodic rate under the constraints of average harvested energy and transmit power is proposed, where the channels are modeled as Rice channels. Firstly, the random matrix theory is used to transform the optimization problem into a deterministic optimization problem. Then, by applying alternating optimization methods, the transmit covariance matrix at the base station and DMA weight matrix are designed to maximize the achievable rate based on only statistical CSI. The simulation results show that the proposed method can achieve the optimal tradeoff between communication rate and harvested energy.

Keywords: DMA; simultaneous wireless information and power transfer; statistical CSI; MIMO