Conditional and unconditional CRB of DOA estimation in spherical harmonics domain
The Cramer-Rao bound (CRB) is widely used in signal processing to characterize the estimation performance. In this paper, the conditional and unconditional CRBs are developed in spherical harmonics domain for direction-of-arrival (DOA) estimation of far-field sources using spherical arrays. The CRBs of azimuth and elevation decrease with the increasing of signal-to-noise ratios (SNRs) and snapshots. Moreover, the CRB of elevation is lower than that of azimuth.