在智能城市中,用于RIS辅助的多用户全双重系统的联合光束成形和相位移动设计
Kunbei Pan1,2, Bin Zhou1, Wei Zhang1
1Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
Sensors (Basel, Switzerland)
|January 11, 2024
概括
可重新配置的智能表面有助于全双重无线通信,但可能会引起干扰. 这项研究提出了一种新的方法来优化城市环境中的性能,优于现有技术.
科学领域:
- 无线通信无线通信
- 信号处理 信号处理
- 超材料是什么?超材料是什么?
背景情况:
- 全双重 (FD) 和可重新配置的智能表面 (RIS) 是提高无线通信效率的关键技术.
- 在智能城市中,RIS辅助的FD系统有望提高物联网 (IoT) 设备的光谱效率.
- 然而,RIS可以引入循环干扰 (LI),加剧FD基站的自我干扰 (SI),特别是在复杂的城市环境中.
研究的目的:
- 解决城市户外环境中RIS辅助的FD系统中剩余SI和LI的挑战.
- 开发一个有效的联合设计,用于束形矩阵和RIS相位移.
- 与基准对比评估拟议的方法,并在实际场景中证明其优越性.
主要方法:
- 在两个城市户外场景中考虑剩余SI和LI的优化问题.
- 将问题分解为基于变量类型的两个子问题.
- 采用连续凸近似 (SCA) 算法和软演员-关键深度强化学习 (DRL) 方案进行替代优化.
- 与RIS相位转换设计基准的性能比较,包括详尽的搜索和固定点代.
主要成果:
- 提出的低复杂度算法实现了接近彻底搜索的性能.
- 拟议的算法显著优于固定点代方案.
- 拟议的方法在第二种情景中表现出卓越的性能,突出了其在复杂的城市环境中的优势.
结论:
- 开发的联合优化方法有效地减轻了RIS辅助FD系统的干扰.
- 拟议的基于SCA和DRL的方法为城市无线通信提供了实用和高效的解决方案.
- 该研究证实了RIS辅助的FD技术在智能城市应用中的巨大潜力,特别是在具有挑战性的户外环境中.
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