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Perera, S., Ariyarathna, V., Udayanga, N., Madanayake, A., Wu, G., Belostotski, L., Wang, Y., Mandal, S., Cintra, R., & Rappaport, T.(2018).Wideband $ N $-Beam Arrays Using Low-Complexity Algorithms and Mixed-Signal Integrated Circuits.IEEE Journal of Selected Topics in Signal Processing,12(2),368--382.