Li Hang, Cheng Zhiqun
School of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China.
Sensors (Basel). 2021 Mar 9;21(5):1901. doi: 10.3390/s21051901.
Angle-of-arrival (AoA) estimation in localized hybrid arrays suffers from phase ambiguity owing to its localized structure and vulnerability to noise. In this letter, we propose a novel phase shift design, allowing each subarray to exploit difference beam steering in two potential AoA directions. This enables the calibration of cross-correlations and an enhanced phase offset estimation between adjacent subarrays. We propose two unambiguous AoA estimation schemes based on the even and odd ratios of the number of antennas per subarray to the number of different phase shifts per symbol (i.e., N/K), respectively. The simulation results show that the proposed approach greatly improves the estimation accuracy as compared to the state of the art when the ratio N/K is even.
由于其局部结构和对噪声的易感性，局部混合阵列中的到达角（AoA）估计存在相位模糊问题。在本信函中，我们提出了一种新颖的相移设计，使每个子阵列能够在两个潜在的AoA方向上利用不同的波束转向。这使得能够校准互相关，并增强相邻子阵列之间的相位偏移估计。我们分别基于每个子阵列的天线数量与每个符号的不同相移数量之比（即N/K）的偶数和奇数比，提出了两种无模糊AoA估计方案。仿真结果表明，当N/K比为偶数时，与现有技术相比，所提出的方法大大提高了估计精度。
