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A Closed-Form PS-DFT Codebook Design for mmWave Beam Alignment

机译：用于毫米波光束对准的闭式PS-DFT码本设计

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摘要

Multi-resolution codebook based hierarchical beam training is an attractive solution to the heavy overhead of millimeter-wave (mmWave) beam alignment. However, most existing codebooks suffer from either undesired main-lobefluctuation or high hardware-complexity. To address these issues, this paper proposes a closed-form phase-shifted discrete Fourier transformation (PS-DFT/CF) codebook design for mmWave links with hybrid structures. The proposed codebook is of hybrid analog/digital architecture. Analog components are fixed-size DFT vectors, which can be readily implemented with radiofrequency (RF) phase shifters. Digital components at baseband select unitary subbeams shaped by the analog components and tackle the impact of the phase difference between adjacent subbeams, such that multi-resolution flat beam patterns can be synthesized. Moreover, the closed-form PS-DFT codebook design enables joint transceiver design for mmWave beam alignment. Numerical results verify that the proposed PS-DFT/CF codebook approaches the performance of the ideal PS-DFT counterpart.
机译：基于多分辨率代码本的分层波束训练是解决毫米波（mmWave）波束对准繁重开销的一种有吸引力的解决方案。但是，大多数现有的码本都具有不希望的主瓣波动或较高的硬件复杂性。为了解决这些问题，本文针对具有混合结构的mmWave链路提出了一种闭式相移离散傅里叶变换（PS-DFT / CF）码本设计。所提出的密码本是模拟/数字混合架构。模拟分量是固定大小的DFT向量，可以使用射频（RF）移相器轻松实现。基带处的数字分量选择由模拟分量整形的单一子光束，并解决相邻子光束之间相位差的影响，从而可以合成多分辨率平光束图案。此外，封闭式PS-DFT码本设计可实现毫米波波束对准的联合收发器设计。数值结果验证了所提出的PS-DFT / CF码本接近理想PS-DFT对应物的性能。

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