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首页> 外文期刊>Wireless Communications Letters, IEEE >Hybrid Beamforming With Finite-Resolution Phase Shifters for Multiuser Millimeter-Wave Downlink
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Hybrid Beamforming With Finite-Resolution Phase Shifters for Multiuser Millimeter-Wave Downlink

机译:带有有限分辨率移相器的混合波束成形,用于多用户毫米波下行链路

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摘要

This letter considers hybrid analog-digital beamforming with discrete-phase shifters for multiuser multiple-input and single-output (MISO) downlink transmission in millimeter-wave (mm-wave) channels. A max-min signal-to-interference-plus-noise ratio (SINR) fairness problem is formulated. Owing to the discrete-phase constraints, this problem is a mixed integer nonlinear program (MINP) and is generally NP-hard. To handle it, an alternating optimization approach is employed. Specifically, for the digital beamformer, zero-forcing (ZF) beamforming is utilized. For the discrete-phase analog beamformer, we first derive an equivalent continuous reformulation and then solve it by leveraging an inexact majorization-minimization (MM) algorithm, which is built upon the first-order method and MM update. Simulation results show that the proposed design can almost achieve the optimal performance of the exhaustive search method, and can approach the optimal full-digital performance with increasing resolution of the discrete-phase shifters.
机译:这封信考虑了具有离散移相器的混合模数波束形成,用于毫米波(mm-wave)通道中的多用户多输入和单输出(MISO)下行链路传输。提出了最大-最小信号干扰加噪声比(SINR)公平性问题。由于离散相位的限制,此问题是混合整数非线性程序(MINP),通常是NP难的。为了解决这个问题,采用了一种交替优化方法。具体地,对于数字波束形成器,利用了零强制(ZF)波束形成。对于离散相位模拟波束形成器,我们首先导出等效的连续重新公式化,然后通过利用基于一阶方法和MM更新的不精确主化最小化(MM)算法来解决。仿真结果表明,所提出的设计几乎可以达到穷举搜索方法的最佳性能,并且随着离散相移器分辨率的提高,可以达到最佳的全数字性能。

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