OANM: An Atomic Separation-free Solution for DoA-estimation in Wireless Communication

Direction-of-Arrival (DoA)-estimation is indispensable in the industry of wireless communication, for example, it is pivotal in DoA-localization and downlink beamforming. In this paper, we introduce the concept and practical implementation of Orthonormal Atomic Norm Minimization (OANM), a kind of innovative way of compressive sensing, which can be used for DoA-estimation and is more inter-antenna spacing separation-free with the usage of only single-snapshot of received signal. The result shows that OANM can successfully estimate the DoAs of signals transmitted by all different users with low complexity but high efficiency.