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首页> 外文期刊>IEEE Transactions on Signal Processing >Wideband Beamspace Channel Estimation for Millimeter-Wave MIMO Systems Relying on Lens Antenna Arrays
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Wideband Beamspace Channel Estimation for Millimeter-Wave MIMO Systems Relying on Lens Antenna Arrays

机译:依靠透镜天线阵列的毫米波MIMO系统的宽带波束空间信道估计

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摘要

Beamspace channel estimation is indispensable for millimeter-wave MIMO systems relying on lens antenna arrays for achieving substantially increased data rates, despite using a small number of radio-frequency chains. However, most of the existing beamspace channel estimation schemes have been designed for narrowband systems, while the rather scarce wideband solutions tend to assume that the sparse beamspace channel exhibits a common support in the frequency domain, which has a limited validity owing to the effect of beam squint caused by the wide bandwidth in practice. In this paper, we investigate the wideband beamspace channel estimation problem without the common support assumption. Specifically, by exploiting the effect of beam squint, we first prove that each path component of the wideband beamspace channel exhibits a unique frequency-dependent sparse structure. Inspired by this structure, we then propose a successive support detection (SSD) based beamspace channel estimation scheme, which successively estimates all the sparse path components following the classical idea of successive interference cancellation. For each path component, its support at different frequencies is jointly estimated to improve the accuracy by utilizing the proved sparse structure, and its influence is removed to estimate the remaining path components. The performance analysis shows that the proposed SSD-based scheme can accurately estimate the wideband beamspace channel at a low complexity. Simulation results verify that the proposed SSD-based scheme enjoys a reduced pilot overhead, and yet achieves an improved channel estimation accuracy.
机译:尽管依靠少量的射频链,波束空间信道估计对于依靠透镜天线阵列来实现显着提高的数据速率的毫米波MIMO系统来说是必不可少的。但是,大多数现有的波束空间信道估计方案都是为窄带系统设计的,而相当稀少的宽带解决方案倾向于假定稀疏的波束空间信道在频域中表现出共同的支持,由于其影响,有效性有限。在实践中由于宽带宽而引起的斜视。在本文中,我们研究了没有通用支持假设的宽带波束空间信道估计问题。具体来说,通过利用斜射斜视的影响,我们首先证明宽带波束空间信道的每个路径分量都表现出独特的频率相关稀疏结构。受此结构的启发,我们然后提出了一种基于连续支持检测(SSD)的波束空间信道估计方案,该方案遵循经典的连续干扰消除的思想,连续估计所有稀疏路径分量。对于每个路径分量,通过利用已证明的稀疏结构来联合估计其在不同频率下的支持以提高精度,并去除其影响以估计剩余的路径分量。性能分析表明,所提出的基于SSD的方案可以以较低的复杂度准确估计宽​​带波束空间信道。仿真结果验证了所提出的基于SSD的方案减少了导频开销,但仍实现了更高的信道估计精度。

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