Near Optimum Power Control and Precoding under Fairness Constraints in Network MIMO Systems
Figure 9
The beneficial impact of transmission precoding in the sum power minimization problem (22) with optimal SINR target selection without fairness.
(a) Power consumption without (upper) and with (lower) precoding in Case . Precoding has a significant impact on the minimum sum power that reaches the capacity target. The sum power is dominated by MS-3 whose power can be reduced by more than 30% due to precoding gains
(b) SINR evolution for the two streams of MS-3 without (upper) and with (lower) precoding in Case . With precoding, the transmit weights keep the stream SINR values “together,” while without precoding, one of the SINR values “overshoots”
