“…For performance comparison, we used four scenarios (K, K s , N T , N R , N r , N, I ter ) = (10, 4, 2, 10, 2, 10, 25), (26, 4, 2, 8, 2, 26, 25), (30, 3, 2, 6, 3, 30, 25), (16,6,2,8,3,16,25), and (20,4,10,2,20,25 of all initial population), "BPSO with cyclic shift" (randomly generated initial feed and its cyclic shifts for the initial population), and BPSO with the best norm feed. In the BPSO with the best norm feed, 6 the antennas/users with the best channel conditions are selected to construct the initial feed, and the individuals in the initial population are generated by cyclically shifting this initial feed.…”