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This letter is aimed at investigating a method to design nonuniform multiple-input-multiple-output (MIMO) arrays using an analytical strategy based on almost difference sets (ADSs). Numerical experiments are carried out to compare the properties of the ADS-based layouts with traditional uniform arrangements in terms of achievable capacity and design efficiency. Representative results from a preliminary numerical analysis indicate that the proposed approach enables a significant capacity increase in all considered scattering scenarios. More specifically, larger improvements are yielded in case of poor-scattering environments where the performances of MIMO systems usually worsen.