Hybrid Beamforming for Downlink Massive MIMO Systems with Multiantenna User Equipment

S. Payami, M. Ghoraishi, M. Dianati
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引用次数: 11

Abstract

In this paper, a novel hybrid precoding algorithm is proposed for the downlink of a multiantenna multiuser massive multiple-input multiple-output (MIMO) system. Firstly, a modified block diagonalization precoding technique is presented. Then, it is shown that combining the modified block diagonalization with hybrid beamforming can achieve a similar sum-rate as block diagonalization with digital beamforming can. Moreover, the performance of the presented algorithm is comparable to the achievable rate in the single-user scenario where there is a full collaboration among the receivers. In a sparse scattering channel, the proposed technique has significantly higher sum-rate compared to a zero- forcing based hybrid beamformer. When digital phase shifters with 3-bits of resolution are used at the RF beamformer, the proposed algorithm achieves the performance of a hybrid beamforming algorithm with analog phase shifting.
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具有多天线用户设备的下行链路大规模MIMO系统的混合波束形成
针对多天线多用户海量多输入多输出(MIMO)系统的下行链路,提出了一种新的混合预编码算法。首先,提出了一种改进的块对角化预编码技术。结果表明,将改进的块对角化与混合波束形成相结合,可以获得与块对角化与数字波束形成相似的和速率。此外,该算法的性能可与接收器之间充分协作的单用户场景中可实现的速率相媲美。在稀疏散射通道中,与基于零强迫的混合波束形成器相比,该技术具有明显更高的和速率。当射频波束形成器采用3位分辨率的数字移相器时,该算法达到了模拟移相混合波束形成算法的性能。
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