Fig. 8From: Performance analysis of cooperative cognitive MIMO multiuser downlink transmission with perfect and imperfect CSI over Rayleigh fading channelsThe lower bound of average SER (M = 2, N 1 = 12, N 2 = 3, ω 1 = ω 2 = 1, Ω3 = Ω4 = 2) (a) ρ 1 = ρ 2 <1; (b) ρ 1 = ρ 2 = 1Back to article page