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arXiv 2403.09083eess.SP
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毫米波 IRS 辅助 MIMO 系统的渐近近最优混合波束成形

Asymptotically Near-Optimal Hybrid Beamforming for mmWave IRS-Aided MIMO Systems

Jeongjae Lee, Songnam Hong

AI总结:

针对IRS辅助毫米波MIMO系统,首次仅利用有效信道推导出反射向量与混合波束成形矩阵的联合优化近最优解,仿真证明其性能超越SOTA且对信道估计误差具有稳健性。

摘要:

由于具有较低的复杂度、成本和功耗等优势,混合波束成形是大规模多输入多输出(MIMO)系统的一项新兴技术。最近,智能反射面(IRS)被提出作为用于稳健的毫米波(mmWave)MIMO 系统的高性价比技术。因此,需要联合优化 IRS 辅助的毫米波 MIMO 系统的反射向量和混合波束成形矩阵。由于 IRS 中缺乏射频链路,无法分别获取 TX-IRS 和 IRS-RX 信道。相反,文献中有一些有效的方法可以估计所谓的有效(或级联)信道。我们首次仅使用有效信道推导了上述联合优化的近最优解。基于我们的理论分析,我们通过将渐近解投影到模数约束上,开发了实用的反射向量和混合波束成形矩阵。通过仿真证明,所提出的构造可以优于最先进的(SOTA)方法,而后者甚至需要分别知道 TX-IRS 和 IRS-RX 信道。此外,我们的构造可以为信道估计误差提供稳健性,这对于实际的大规模 MIMO 系统是不可避免的。

英文摘要:

Hybrid beamforming is an emerging technology for massive multiple-input multiple-output (MIMO) systems due to the advantages of lower complexity, cost, and power consumption. Recently, intelligent reflection surface (IRS) has been proposed as the cost-effective technique for robust millimeter-wave (mmWave) MIMO systems. Thus, it is required to jointly optimize a reflection vector and hybrid beamforming matrices for IRS-aided mmWave MIMO systems. Due to the lack of RF chain in the IRS, it is unavailable to acquire the TX-IRS and IRS-RX channels separately. Instead, there are efficient methods to estimate the so-called effective (or cascaded) channel in literature. We for the first time derive the near-optimal solution of the aforementioned joint optimization only using the effective channel. Based on our theoretical analysis, we develop the practical reflection vector and hybrid beamforming matrices by projecting the asymptotic solution into the modulus constraint. Via simulations, it is demonstrated that the proposed construction can outperform the state-of-the-art (SOTA) method, where the latter even requires the knowledge of the TX-IRS and IRS-RX channels separately. Furthermore, our construction can provide robustness for channel estimation errors, which is inevitable for practical massive MIMO systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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