论文标题
可重新配置的智能表面和能量收获辅助合作环境反向散射通信
Reconfigurable Intelligent Surface With Energy Harvesting Assisted Cooperative Ambient Backscatter Communications
论文作者
论文摘要
可以通过使用可重构的智能表面（RIS）来协助反向散射发射器来增强合作环境反向散射通信（CABC）的性能。由于RIS功耗是一个不可忽略的问题，因此我们考虑了RIS辅助CABC系统，其中带有能量收集电路的RI不仅可以反映信号，还可以收获无线能量。我们研究了传输设计问题，以最大程度地减少RIS功能消耗，并使用主动和反向散射传输的服务限制质量。优化问题是NP-HARD的混合企业非凸编程问题。为了解决该问题，提出了一种算法，该算法是使用块坐标下降，半决赛松弛和乘数技术交替方向方法提出的。仿真结果证明了所提出的算法的有效性。
The performance of cooperative ambient backscatter communications (CABC) can be enhanced by employing reconfigurable intelligent surface (RIS) to assist backscatter transmitters. Since the RIS power consumption is a non-negligible issue, we consider a RIS assisted CABC system where the RIS with energy harvesting circuit can not only reflect signal but also harvest wireless energy. We study a transmission design problem to minimize the RIS power consumption with the quality of service constraints for both active and backscatter transmissions. The optimization problem is a mixed-integer non-convex programming problem which is NP-hard. To tackle it, an algorithm is proposed by employing the block coordinate descent, semidefinite relaxation and alternating direction method of multipliers techniques. Simulation results demonstrate the effectiveness of the proposed algorithm.
