A Generalized Rearranged Coprime Array Configuration for Direction-of-Arrival Estimation with Increased Degrees of Freedom

In this paper, we propose a novel rearranged coprime array (RCA) configuration for direction-of-arrival (DOA) estimation, which achieves more degrees-of-freedom (DOF) than the existing RCA with the same number of sensors. It is known that RCA is formed by placing additional sensors to fill up the holes in the difference coarray of the thinned coprime array (TCA). Here, we propose a generalized rearranged coprime array (GRCA) configuration, which is obtained by strategically placing extra sensors to fill up the holes in the difference coarray of the generalized thinned coprime array (GTCA). As the GTCA achieves more DOF than the TCA by judiciously choosing its parameters, the proposed GRCA also attains a considerably large number of DOF than the original RCA. The required simulations are carried out to demonstrate the effectiveness and superiority of the proposed GRCA by comparing it with the existing coprime arrays.