A Low-Complex One-Snapshot DOA Estimation Algorithm with Massive ULA.

The conventional direction of arrival (DOA) estimation algorithms, e.g., MUSIC, root-MUSIC, and ESPRIT, may not be effective when applying to massive antenna array configuration, because they not only require a large amount of receive snapshots but also suffer from forbiddingly high computational complexity. In this letter, we propose a low-complex DOA estimation algorithm for massive uniform linear array. We first obtain coarse initial DOA estimates via the fast Fourier transmission and then search for the accurate estimates within a very small region. The proposed method needs one snapshot only and could achieve very high accuracy that is close to the CramrRao bound. Simulation results are provided to corroborate the proposed studies.