Figure 23

Computational complexity of Algorithm 2. The average number of iterations (left), the average sum power (middle) in the function of Δ, and the average number of iterations in the function of SINR^min(right) are shown in Algorithm 2 when the minimum SINR (SINR^min) is set to 1 dB and C^sum=19.18b/s/Hz in Scenario 3 (7-cell system) using cellular mode. The required number of iterations decreases exponentially as Δ(in logarithmic scale) increases (left). With higher Δ values, the sum capacity target is exceeded and the used sum power slightly increases, which means that the accuracy of the algorithm (in terms of keeping the sum rate target) somewhat decreases (middle). The number of iterations reduces linearly in the function of the required minimum SINR in logarithmic scale (right).