International Journal of Digital Multimedia Broadcasting / 2010 / Article / Fig 3

Research Article

Near Optimum Power Control and Precoding under Fairness Constraints in Network MIMO Systems

Figure 3

Sum rate maximization subject to power budget and fairness constraints.
251719.fig.003a
(a) The individual power levels for the six cases we study. The sum power is kept constant (21.6 dBm), but the “distribution” of this power budget changes in the six fairness cases. Note that MS-3 needs to drastically increase its power at the cost of MS-1 and MS-2 to reach similar SINR
251719.fig.003b
(b) The individual rates and the sum rate in the six fairness cases we study. The sum rate decreases as the SINR distribution becomes more fair. The Case sum rate is only about 40% of the highest (no fairness) sum rate

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