Hybrid Ris-Assisted Interference Mitigation for Spectrum Sharing
Hybrid Ris-Assisted Interference Mitigation for Spectrum Sharing
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DOI：
10.1109/icassp49357.2023.10096639
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发表时间：
2023-06
期刊：
影响因子：
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通讯作者：
Fangzhou Wang;A. L. Swindlehurst
中科院分区：
文献类型：
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作者：
Fangzhou Wang;A. L. Swindlehurst
本文探讨了可重构智能表面（RIS），用于减轻频谱共享应用中的跨系统干扰。与只能调整输入信号相位的传统仅反射 RIS 不同，混合 RIS 被认为可以通过吸收部分信号能量来配置撞击信号的相位和模数。我们研究了两种频谱共享场景：（1）雷达和通信系统的频谱共存，其中制定了凸优化问题以最小化从通信基站到雷达接收器的信道矩阵的弗罗贝尼乌斯范数，以及（2）设备到设备（D2D）通信中的频谱共享，其中制定了优化D2D链路之间最坏情况信号干扰加噪声比（SINR）的最大最小方案，然后通过分数规划。数值结果表明，与传统的非吸收性 RIS 不同，只要有足够数量的元件，混合 RIS 在许多情况下可以完全消除干扰。
This paper explores reconfigurable intelligent surfaces (RIS) for mitigating cross-system interference in spectrum sharing applications. Unlike conventional reflect-only RIS that can only adjust the phase of the incoming signal, a hybrid RIS is considered that can configure the phase and modulus of the impinging signal by absorbing part of the signal energy. We investigate two spectrum sharing scenarios: (1) Spectral coexistence of radar and communication systems, where a convex optimization problem is formulated to minimize the Frobenius norm of the channel matrix from the communication base station to the radar receiver, and (2) Spectrum sharing in device-to-device (D2D) communications, where a max-min scheme that optimizes the worst-case signal-to-interference-plus-noise ratio (SINR) among the D2D links is formulated, and then solved through fractional programming. Numerical results show that with a sufficient number of elements, the hybrid RIS can in many cases completely eliminate the interference, unlike a conventional non-absorptive RIS.