From: Optimal linear precoding for opportunistic spectrum sharing under arbitrary input distributions assumption
Case
Iteration
Computational
complexity
Spectrum efficiency
O(2n 2 ln(L R/ϵ 1))
O(2s n 2 ln(L R/ϵ 1))
Energy efficiency
O ( 2 n 2 ln ( LR / ε 1 ) × log 2 ( P t / ε 2 ) )
O ( 2 s n 2 ln ( LR / ε 1 ) × log 2 ( P t / ε 2 ) )