Fig. 5From: Performance analysis of cooperative cognitive MIMO multiuser downlink transmission with perfect and imperfect CSI over Rayleigh fading channelsDiversity and coding gains comparison for the CC-MIMO multiuser systems with imperfect CSI under different antenna equipment (ρ 1 = ρ 2 < 1, ω 1 = 2, ω 2 = 1, Ω3 = 0.5, Ω4 = 1) (a) N 1 = 2, N 2 = 1; (b) N 1 = 12, N 2 = 2Back to article page