Coprime Array Design with Minimum Lag Redundancy

In this paper, we propose a new sparse coprime array design that achieves a higher number of degrees-of-freedom for direction-of-arrival (DOA) estimation. The proposed array design completely avoids lag redundancies between the two constituting subarrays of the coprime array, thus achieving the maximum number of unique correlation lags under the coprime array framework. As a result, given the same number of physical sensors, the proposed design resolves more sources than other coprime array designs with enhanced DOA estimation performance. Simulation results demonstrate the superior performance of the proposed coprime array design.