Design methodology of an analog 9-beam squint-free wideband IF multi-beamformer for mmW applications
Design methodology of an analog 9-beam squint-free wideband IF multi-beamformer for mmW applications
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用于毫米波应用的模拟 9 波束无斜视宽带中频多波束形成器的设计方法
DOI：
10.1109/mercon.2017.7980488
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
R. Cintra
中科院分区：
文献类型：
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作者：
V. Ariyarathna;N. Udayanga;A. Madanayake;Sirani M. Perera;L. Belostotski;R. Cintra
提出了一种适用于多天线系统的中频（IF）无斜视多波束形成方法。所提出的方法使用真实时延（TTD）多波束矩阵的低复杂度因式分解，建议使用模拟集成电路方法来实现。中频多波束的 TTD 实现是通过所提出的延迟范德蒙德矩阵 (DVM) 进行放大和同步下变频实现的，其中矩阵元素对应于每个射频波束的无斜视转向所需的复合相位补偿。提出通过对 DVM 应用稀疏因子分解来在片上有效地实现真实时间延迟，与给定 N 个波束的等效直接实现相比，这会导致电路复杂度较低，需要的 TTD 块和相位补偿数量明显减少。对于 9 光束，所提出的方法可将基于模拟集成电路的 TTD 模块和相位补偿器减少 60%。 TTD 模块可以使用基于有源 RC 的集成模拟全通滤波器在芯片上实现。所提出的多波束算法和电路结构在 55-65 GHz 频率范围内进行仿真，以演示新兴 5G 应用的毫米波载波频率下的无斜视宽带多波束。
An intermediate frequency (IF) squinting-free multi-beamforming method is proposed for multi-antenna systems. The proposed approach uses a low-complexity factorization of a true-time-delay (TTD) multi-beam matrix, which is proposed to be realized using an analog integrated circuits approach. A TTD realization of multi-beams at intermediate frequency is achieved following amplification and synchronous down-conversion via the proposed Delay Vandermonde Matrix (DVM) in which matrix elements correspond to the compound phase compensation required for squint-free steering of each radio-frequency beam. True-time-delays are proposed to be efficiently realized on-chip by applying a sparse factorization to the DVM, which leads to a low circuit complexity implementation requiring a significantly lower number of TTD blocks and phase compensations compared to an equivalent direct implementation for a given N number of beams. The proposed method, for 9-beams, leads to a 60% reduction of analog integrated circuit based TTD blocks and phase compensators. The TTD blocks can be realized on chip using active-RC based integrated analog all-pass filters. The proposed multi-beam algorithm and circuit structure is simulated within the frequency range 55–65 GHz to demonstrate squinting-free wide-band multi-beams at millimeter wave carrier frequencies for emerging 5G applications.