在无线网络中使用角信息的RIS辅助共存
Anish Pradhan1, Idban Alamzadeh2, Mohammadreza F Imani2
1Wireless@VT, Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, 24061, VA, USA.
Scientific reports
|December 27, 2024
概括
可重新配置的智能表面 (RIS) 可以抑制对共存的无线用户的干扰,即使有有限的通道信息. 性能取决于相控位和用户角度,但可以通过增加RIS元素来提高.
科学领域:
- 无线通信网络是无线通信网络.
- 电磁波的传播方式
- 信号处理 信号处理
背景情况:
- 可重新配置的智能表面 (RIS) 通过控制传播环境,为下一代无线网络提供了有希望的解决方案.
- 关于RIS有效性的现有研究通常假定完整的道状态信息 (CSI),在部分或具有挑战性的CSI采购场景下对性能进行有限的探索.
- 在共存的无线网络中,干扰管理至关重要,特别是在处理不合作的用户时.
研究的目的:
- 调查RIS的干扰抑制能力,用于在不合作的网络中与主用户 (PU) 共存的二级用户 (SU).
- 仅使用角度信息来评估RIS性能,即使使用不合作的PU也可以实现这一点.
- 开发和比较RIS中连续和离散相位控制的优化技术,以减轻干扰.
主要方法:
- 采用半确定的放松 (SDR) 和内部大化最小化 (iMM) 对于具有连续相控的RIS.
- 提议一个增强的SDR算法,专门设计用于离散RIS阶段控制.
- 利用角度信息来抑制干扰,绕过了不合作的PU需要完全CSI的需求.
- 进行全波模拟,以验证非合作网络环境中的共存性能.
主要成果:
- 无论是SDR还是iMM方法,都需要至少5位的离散相位控制才能有效地抑制干扰.
- 当主要用户位于特定的角度区域内时,干扰抑制性能会下降.
- 某些角区域的限制取决于所使用的算法,但可以通过增加RIS元素的数量来克服.
- 全波模拟证实了在非合作无线环境中RIS辅助共存的实际可行性.
结论:
- RIS显示出在共存无线网络中干扰管理的巨大潜力,即使在不合作的用户和有限的CSI等具有挑战性的条件下.
- 离散阶段控制位的数量和用户的角度位置是影响RIS性能的关键因素.
- 算法选择和RIS的物理配置 (元素数) 在优化干扰抑制方面发挥着至关重要的作用.
- 该研究验证了RIS在通过先进的优化和模拟技术提高未来无线系统性能方面的有效性.
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