H. Hussein, A. ., N. . M. Salem, M. E. Nasr, and M. . M. Selim. “BER and Capacity/Spectral Efficiency Enhancement of MIMO Systems Using Digital Antenna Arrays Beamforming”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 76, no. 1, Feb. 2021, pp. 218-3, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/6661.