Near Optimum Power Control and Precoding under Fairness Constraints in Network MIMO Systems
Figure 10
The beneficial impact of transmission precoding in the sum power minimization problem (22) with optimal SINR target selection with fairness.
(a) Power consumption without (upper) and with (lower) precoding in Case . Case requires much higher sum power than Case due to the fairness constraints. However, precoding makes even Case feasible, due to the 66% power saving (see lower figure)
(b) SINR evolution for the two streams of MS-3 in Case . The figure is similar to Figure 9(b), but now precoding helps to reduce the higher SINR streams SINR from around 5 (7 dB) to 1.2 (0.8 db)
