Algorithm 1 SCA-based Power Optimization Algorithm

1: Initialize: $P_u^{\left(i\right)}$, ${\mu }^{\left(i\right)}$, γ, i 2: Repeat 3: Fix ${\mu }^{\left(i\right)}$, solve (44) to get solution $P_u^{(i+1)}$; 4. Fix $P_u^{(i+1)}$, solve (47) to get solution ${\mu }^{(i+1)}$; 5: Set i = i + 1; 6: Until the growth of objective value is less than γ; 7: Output: Power allocation $\mathbf{P}=\{P_u, \mu \}$