Energy Efficiency Maximization for Multi-Cell Multi-Carrier NOMA Networks

. 2020 Nov 20;20(22):6642. doi: 10.3390/s20226642

Algorithm 2 Subcarrier assignment matching scheme.

Initialize power allocation for all users.
Obtain users’ BSs association by Algorithm 1.
Initialize the matched $M U$ , the unmatched $U M U = {[|h_{m, i, k}|]}_{N \times K}$ for a given cell m, and $U K$ lists to record the matched users, the unmatched, and the user’s preferable subcarrier.
while $U M U \neq ϕ$ do
for $i = 1 : N$ do
if $i \in U M U$ then
Find the maximum value $|h_{m, i}|$ from $U M U$ according to:
$|h_{m, i, k}| = \underset{i \in A U}{arg max} U M U_{N \times K}$ (17)
Match the user i with the subcarrier k, and remove him/her from $U M U$ .
Assume each subcarrier k has a matching user i; we have $T_{u} = \{M U (k), \{i\}\}, u = 1, . . \dots, K$
if $M U (k) \geq 1$ then
Calculate the EE, and select the set with the higher EE such that:
$T = \underset{T_{u}}{arg max} E E (T_{u})$ (18)
Update $M U$ , and remove the selected users from $U M U$ . Update $U K$ by removing the matched subchannel.
end if
end if
end for
end while