Enhanced Coprime Array Configuration for DoA Estimation of Non-Circular Signals

Recently, sparse arrays have received considerable attention owing to their capability of achieving increased degrees of freedom (DoFs) by exploiting the virtual sensors resulting from their difference or sum-difference coarrays. Mutual coupling is another factor that attracts interest to these kinds of arrays. In this paper, both the fundamental criteria of high DoFs and reduced mutual coupling are considered in the design of the proposed array configuration for the direction of arrival (DoA) estimation of non-circular signals. Simulation results are provided to verify the robustness of the proposed array against heavy mutual coupling.