Figure 3From: On base station cooperation using statistical CSI in jointly correlated MIMO downlink channelsComparison of the ergodic sum capacity upper bound in (25) with the exact ergodic mutual information N t ( 1 ) = 2 , N t ( 2 ) = 2 , N r = 2 , N t ( 1 ) = 2 , N t ( 2 ) = 2 , N r = 4 , and N t ( 1 ) = 4 , N t ( 2 ) = 4 , N r = 8 .Back to article page