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For a sub-connected hybrid multiple-input multiple-output (MIMO) receiverwith $K$ subarrays and $N$ antennas, there exists a challenging problem of howto rapidly remove phase ambiguity in only single time-slot. First, a DOAestimator of maximizing received power (Max-RP) is proposed to find the maximumvalue of $K$-subarray output powers, where each subarray is in charge of onesector, and the center angle of the sector corresponding to the maximum outputis the estimated true DOA. To make an enhancement on precision, Max-RP plusquadratic interpolation (Max-RP-QI) method is designed. In the proposedMax-RP-QI, a quadratic interpolation scheme is adopted to interpolate the threeDOA values corresponding to the largest three receive powers of Max-RP.Finally, to achieve the CRLB, a Root-MUSIC plus Max-RP-QI scheme is developed.Simulation results show that the proposed three methods eliminate the phaseambiguity during one time-slot and also show low-computational-complexities. Inparticular, the proposed Root-MUSIC plus Max-RP-QI scheme can reach the CRLB,and the proposed Max-RP and Max-RP-QI are still some performance losses$2dB\thicksim4dB$ compared to the CRLB.

Rapid Phase Ambiguity Elimination Methods for DOA Estimator via Hybrid Massive MIMO Receive Array