Multi-Resolution Codebook Based Beamforming Sequence Design in Millimeter-Wave Systems
Multi-Resolution Codebook Based Beamforming Sequence Design in Millimeter-Wave Systems
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DOI：
10.1109/glocom.2014.7417848
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发表时间：
2014-12
期刊：
影响因子：
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通讯作者：
Song Noh;M. Zoltowski;D. Love
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文献类型：
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作者：
Song Noh;M. Zoltowski;D. Love
由于在第五代（5G）无线系统中可用的大带宽，人们对使用毫米波（mmWave）通信越来越感兴趣。为了克服毫米波波段较高的路径损耗，使用大规模或大规模多输入多输出（MIMO）系统的高定向波束形成至关重要。在这种情况下，信道估计问题变得具有挑战性，因为使用高分辨率窄波束探测所有可能的波束方向需要大量的训练开销。为了解决毫米波系统中的波束搜索问题，我们考虑使用和设计多分辨率波束形成序列，该序列可以以对分方式快速搜索出优势信道方向。在给定多分辨率码本的情况下，所设计的多分辨率波束形成序列在最小化训练开销和最大化波束形成增益之间取得平衡。我们讨论了如何使用{\em离散傅立叶变换}（DFT）矩阵的相移版本来设计多分辨率码本。数值结果表明了该算法的有效性。
There is growing interest in using millimeter wave (mmWave) communication for fifth generation (5G) wireless systems because of the large bandwidth available in these frequencies. To overcome the higher path loss at mmWave bands, highly directional beamforming using large-scale, or massive, multiple-input multiple-output (MIMO) systems is critical. In this scenario, the problem of channel estimation becomes challenging due to the substantial training overhead needed to sound all possible beam directions using a high-resolution narrow beam. To tackle the issue of beam search in a mmWave system, we consider the use and design of multi-resolution beamforming sequences, which can quickly search out the dominant channel direction in a bisection manner. Given the multi-resolution codebook, the proposed multi-resolution beamforming sequence is designed to strike a balance between minimizing the training overhead and maximizing beamforming gain. We discuss how the multi-resolution codebook can be designed using a phase-shifted version of a {\em discrete Fourier transform} (DFT) matrix. Numerical results show the effectiveness of the proposed algorithm.