Abstract
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 N to the number of different phase shifts per symbol K (i.e., ), 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 is even.
Highlights
As shown in the c figure, the proposed phase shift design outperforms that of [5] in terms of mean square error (MSE) of e j Nu, c c can be achieved at Step 9 of Algorithm 1
The MSE curve of e j Nu since a higher signal-to-noise ratio (SNR) for Nu becomes increasingly tight to its asymptotic lower bound with the increase of γa, where the asymptotic lower bound is the lower bound of proposed approach produced under the assumption of Pd = 1
We proposed a novel phase shift design to facilitate the estimation of a single AoA in a localized hybrid array
Summary
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